Publications

@inproceedings{Pavesi2016a,

title = {Experimental Investigation on Influence of Relative Positions between Diffuser and Volute on Pressure Fluctuation at the Outlet of a Centrifugal Pump},

author = {Wenjie Wang and Shouqi Yuan and Ji Pei and Giorgio Pavesi and Yandong Gu and Ji Pei and Wenjie Wang and Shouqi Yuan and Giorgio Pavesi},

url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?doi=10.1115/FEDSM2016-7740},

doi = {10.1115/fedsm2016-7740},

issn = {08888116},

year  = {2016},

date = {2016-01-01},

urldate = {2016-01-01},

booktitle = {ASME 2016 Fluid Engineering Division summer Meeting FEDSM2016},

volume = {1A-2016},

pages = {1-8},

publisher = {ASME},

abstract = {To investigate the influence of relative positions between a radial diffuser and an annular volute on the unsteady pressure at the centrifugal pump outlet, experiment tests were carried out with five positions between the diffuser and volute in an open test rig. Statistical and frequency spectrum analyses were carried out to obtain the pressure fluctuation amplitude range and the frequency domain respectively. The results showed that the relative position has greater influence on the pressure at large flow rate than at part load condition. The dominant frequency and the Power Spectrum Density (PSD) values are affected by diffuser azimuthal position and the harmonic frequencies are determined by number of blades and vanes. The investigation can give a reference to optimize the relative angle between diffuser and volute to reduce the pressure fluctuations.},

keywords = {Diffuser, Pump, Volute},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{pop00015,

title = {Fluid leakage effect on analysis of a vaned diffuser of SHF},

author = {Annie-Claude Bayeul-Lainé and Patrick Dupont and L. Miccoli and Giovanna Cavazzini and Antoine Dazin and Giorgio Pavesi and Gérard Bois},

url = {https://www.researchgate.net/profile/Annie_Claude_Bayeul-Laine/publication/260420480_FLUID_LEAKAGE_EFFECT_ON_ANALYSIS_OF_A_VANED_DIFFUSER_OF_SHF_PUMP/links/00b7d5311e11635c23000000.pdf},

year  = {2014},

date = {2014-01-01},

urldate = {2014-01-01},

booktitle = {15th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2014},

pages = {1-8},

publisher = {researchgate.net},

abstract = {The paper presents the results of numerical analysis on the local and global internal flow behaviour at the inlet of the vaned diffuser of a radial flow pump model, taking into account the effect of fluid leakages for various flow rates and a given rotation of speed. For each flow rate, numerical calculations were performed both with two different boundary conditions: - Without any leakage effects - With calculated leakage effects. The numerical simulations were realized with the two commercial codes: i-Star CCM+ 8.02.011 (at LML), ii-CFX 10.0 (at University of Padova). RANS unsteady calculations, with a k-? RNG model were performed with Star CCM+. Fully unsteady calculations of the whole pump were done with CFX with DES turbulent method (Cavazzini [1]). For each flow rate, different angular positions of the impeller are considered. First part of the paper shows global comparisons between numerical and experimental results already presented in ref [2-3], for which the effects of fluid leakage due to the gap between the rotating and fixed part of the pump model were found to be interesting to be analysed. Second part is devoted to the local comparisons of flow structures at the inlet section of the diffuser, without},

keywords = {Diffuser, Leakage flow, Numerical calculations, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Cavazzini2013,

title = {Unsteady velocity piv measurements and 3D numerical calculation comparisons inside the impeller of a radial pump model},

author = {Giovanna Cavazzini and Patrick Dupont and Antoine Dazin and Giorgio Pavesi and Annie-Claude Bayeul-Lainé and Gérard Bois},

issn = {24104833},

year  = {2013},

date = {2013-01-01},

urldate = {2013-01-01},

booktitle = {10th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2013},

pages = {1-10},

abstract = {PIV measurements were performed at mid hub to shroud section inside the impeller of a vaned diffuser pump model working with air. Several previous papers have already presented part of impeller flow characteristics mainly for vaneless diffuser and near nominal mass flow rate. This paper concerns the pump configuration where the diffuser blades interacted with the impeller flow. Each PIV measuring plane was related to one particular impeller blade to blade channel and analyzed according to different relative positions of the vaned diffuser. A fully unsteady calculation of the whole pump has been performed and comparisons between numerical and experimental results are presented and discussed for four different mass flow rates. The present analysis is restricted to the outlet section of the impeller blade to blade passage for one particular impeller blade position relative to the diffuser.},

keywords = {PIV, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Cavazzini2011c,

title = {Analysis of Unsteady Flow Velocity Fields Inside the Impeller of a Radial Flow Pump: PIV Measurements and Numerical Calculation Comparisons},

author = {Giovanna Cavazzini and Patrick Dupont and Giorgio Pavesi and Antoine Dazin and Gérard Bois and Abdelmadjid Atif and Patrick Cherdieu},

url = {http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1625836},

doi = {10.1115/AJK2011-22055},

isbn = {978-0-7918-4440-3},

year  = {2011},

date = {2011-01-01},

booktitle = {ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D},

volume = {1},

issue = {PARTS A, B, C, D},

pages = {747-754},

publisher = {ASME},

abstract = {PIV measurements were performed at mid hub to shroud section inside the impeller of a vaned diffuser pump model working with air. The measurements were restricted to the outlet section of the impeller where the diffuser blades interacted with the impeller flow. Each PIV measuring plane was related to one particular impeller blade to blade channel and analysed according to different relative positions of the vaned diffuser. Two frame change models were considered: the so-called frozen rotor approach for different impeller passage positions relative to the vaned diffuser and a fully unsteady calculation of the whole pump. Comparisons between numerical and experimental results are presented and discussed for a specific mass flow rate corresponding to an off-design point for the impeller and a design point for the vaned diffuser. Copyright © 2011 by ASME.},

keywords = {PIV, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Pavesi2011a,

title = {Experimental and Numerical Investigation of Un-Forced Unsteadiness in a Vaneless Radial Diffuser},

author = {Giorgio Pavesi and Antoine Dazin and Giovanna Cavazzini and Guy Caignaert and Gerard Bois and Guido Ardizzon},

year  = {2011},

date = {2011-01-01},

urldate = {2011-01-01},

booktitle = {ETC 9 - 9th European Turbomachinery Conference},

issue = {1989},

pages = {1-12},

abstract = {The paper reports combined experimental and numerical investigations of unforced un- steadiness in a vaneless radial diffuser. Experimental data were obtained within the diffuser using stereoscopic time resolved Particle Image Velocimetry (PIV) recording three velocity components in a plane (2D/3C), coupled with unsteady pressure transducers. To characterize the inception and the evolution of the unsteady phenomena, spectral analyses of the pressure signals were carried out both in frequency and time-frequency domains and the PIV results were post processed by an original averaging method. Two partial flow rates were investigated in detail in this paper. A single unforced unsteadiness was identified for the lowest flow rate, whereas, two competitive intermittent modes were recognized for the higher mass flow. Numerical analyses were carried out on the same pump by the commercial code CFX. All the computations were performed using the unsteady transient model and the turbulence was modelled by the Scale-Adaptive Simulation (SAS) model. Numerical pressure signals were compared with the experimental data to verify the development of the same pressure fluctuations.},

keywords = {PIV, Pump, unsteady flow fields, vaneless diffuser},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Cavazzini2009,

title = {Rotating Instabilities in a Radial Vaneless Diffuser Part II : Comparison of Experimental and Numerical Results},

author = {Giovanna Cavazzini and Antoine Dazin and Giorgio Pavesi and Patrick Dupont and Sebastien Coudert and Guido Ardizzon and Guy Caignaert and Gérard Bois},

isbn = {9783851250367},

year  = {2009},

date = {2009-01-01},

booktitle = {8th Conference on Turbomachinery, Fluid Dynamics and Thermodynamics},

pages = {1-10},

abstract = {The paper refers to the vaneless diffuser flow analysis of a radial flow pump in partial flow operating conditions. Numerical data obtained with the help of the CFX computer code are compared with the experimental results (high speed PIV and unsteady pressure measure- ments) presented in the first part of this paper. Averaged results and Fourier spectra are com- pared, as well as the flow patterns associated with a rotating instability occurring at this flow rate. The numerical data are also used to analyse the flow behaviour at this flow rate.},

keywords = {Instability, Pump, Rotating Instability, Stall, vaneless diffuser},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{pop00041,

title = {Rotor-stator interactions in a radial flow pump},

author = {Giorgio Pavesi and Giovanna Cavazzini and Patrick Dupont and Sebastien Coudert and Guy Caignaert and Gérard Bois and Guido Ardizzon},

year  = {2007},

date = {2007-01-01},

urldate = {2007-01-01},

booktitle = {Proceedings of the 7th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2007},

abstract = {The paper refers to the analysis of interactions between the impeller and the vaned dif- fuser of a radial flow pump. It mainly focuses on the flow within one blade passage of a vaned diffuser in four operating conditions. The 2D/2C PIV technique was used to analyze the diffuser flow field in various measuring planes in the hub to shroud direction, for one relative impeller position in the diffuser frame. These experimental results were compared to numerical data obtained with the help of CFX computer code.},

note = {<b>From Duplicate 1 (<i>Rotor-stator interactions in a radial flow pump</i> - Pavesi, G; Cavazzini, G; Dupont, P; Coudert, S.; Caignaert, G.; Bois, G.; Ardizzon, G.)<br/></b><br/>Query date: 2017-05-06<br/><br/><b>From Duplicate 2 (<i>Rotor-stator interactions in a radial flow pump</i> - Pavesi, Giorgio; Cavazzini, Giovanna; Dupont, Patrick; Coudert, Sebastien; Caignaert, Guy; Bois, Gérard; Ardizzon, Guido)<br/></b><br/><b>From Duplicate 2 (<i>Rotor-stator interactions in a radial flow pump</i> - Pavesi, G; Cavazzini, G; Dupont, P; Coudert, S.; Caignaert, G.; Bois, G.; Ardizzon, G.)<br/>And Duplicate 3 (<i>Rotor-stator interactions in a radial flow pump</i> - Pavesi, G; Cavazzini, G; Dupont, P; Coudert, S.; Caignaert, G.; Bois, G.; Ardizzon, G.)<br/>And Duplicate 4 (<i>Rotor-stator interactions in a radial flow pump</i> - Pavesi, G; Cavazzini, G; Dupont, P; Coudert, S.; Caignaert, G.; Bois, G.; Ardizzon, G.)<br/></b><br/>Query date: 2017-05-06},

keywords = {Francis-type Reversible Turbine, Pump, Pump as Turbine, Rotor Stator Interaction},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Pavesi2005b,

title = {Rotating Instability in a Centrifugal Pump Impeller},

author = {Giorgio Pavesi and Guido Ardizzon and Giovanna Cavazzini},

url = {http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-33645960402&partnerID=40&rel=R7.0.0},

doi = {10.1115/imece2005-79937},

issn = {08888116},

year  = {2005},

date = {2005-01-01},

urldate = {2005-01-01},

booktitle = {2005 ASME International Mechanical Engineering Congress and Exposition},

volume = {261 FED},

issue = {1},

pages = {1-9},

abstract = {The objective of the study was the experimental and computational investigation of the unsteady flow in the centrifugal pumps. This paper analysed the effect of the vaneless stator interference on the exit flow field of a radial pump operated in the DIM facility. High-response pressure transducers were used to determine unsteady pressure field at three planes at the pump and at diffuser inflows. The experimental data showed that unsteady pressure disturbances modes change when the flow was reduced. Detailed analysis showed that disturbances occur at distinct frequencies and that these rotated in the circumferential direction. Comparison of the pressure signals measured at two circumferential locations on the casing confirmed the characteristic frequency pattern to be a so called "rotating instability". This unsteady phenomenon was highlighted both at design flow rate and at low flow rates. The azimuthal distributions exhibited significant nonuniformities. The amplitude of this non-uniformity was sensitive to the flow rate. A simple model showed that, contrary to the common belief, the transport of the vane wake and secondary flows across the rotor was not enough to explain the magnitude of the variations. In this paper numerical investigations of the unsteady three-dimensional flow through the pump stage were also presented. Turbulence was modelled both by the k-? transport equations model, and Reynolds Stress Model based on the coequation. The effects of the tip leakage flow were considered by meshing the tip clearance between rotor blade and casing. Results showed the jet-wake flow pattern induced an unstable vortex, which influenced flow discharging from the adjacent passage and destabilised jet-wake flow in the passage. Both calculations and measurements detected the periodic fluctuations at impeller discharge which were found to be coherent from blade to blade and possessed a rich harmonic content. Copyright 2005 by ASME.},

keywords = {Francis-type Reversible Turbine, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon2001,

title = {Stallo e Ricircolazione ai Carichi Parziali di una Turbopompa: Confronto tra Risultati Sperimentali e Predizioni Numeriche},

author = {Guido Ardizzon and Giorgio Pavesi and Ernesto Benini},

year  = {2001},

date = {2001-01-01},

booktitle = {55° Congresso Nazionale ATI},

pages = {301-312},

abstract = {Sono presentati e discussi i risultati sperimentali e numerici di una ricerca volta a caratterizzare il comportamento fuori progetto di una turbomacchina operatrice centrifuga. In particolare, si è cercato di descrivere il comportamento fluidodinamico della sola girante rimuovendo dalla macchina in esame il diffusore palettato di cui era munita senza, tuttavia, alterare la geometria meridiana del canale di diffusione. Particolare attenzione è stata dedicata alle ricircolazioni di portata che hanno luogo all’ingresso e all’uscita della girante, alle cause che le determinano e all’assorbimento di energia che danno luogo.},

keywords = {Pump, Stall},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon2001b,

title = {Portata di Fuga e Perdite per Ventilazione nelle Turbomacchine: Confronto tra Risultati Sperimentali e Predizioni Numeriche},

author = {Guido Ardizzon and Giorgio Pavesi},

year  = {2001},

date = {2001-01-01},

urldate = {2001-01-01},

booktitle = {55° Congresso Nazionale ATI},

pages = {289-300},

publisher = {SGE - Padova},

abstract = {Computations, made using the AEA Technology CFX-TascFlow code, and torque data, obtained in a purposes-built experimental ring, have been used to study the flow of the shroud-to-housing leakage flow in pumps. Tests have been carried out varying both the speed of fictitious runners and the axial clearance-disk radius ratio. Contrary to the relationships given in the literature, all the experiments have shown that windage loss power increases significantly by increasing the leakage flowrate. Moreover, an approximately linear dependency was observed, according to the expectations of a simple model suggested by the authors. The computed results also illustrate the mechanism with which the flow/rotor interaction is altered by the leakage. This is done through a comparative examination of the moment coefficient for a wide range of leakage flowrate and axial clearance. The conclusions of this theoretical study are consistent with experimental finding and have important design implications.},

keywords = {Leakage flow, Pump, Ventilation Losses},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{ArdizzonGPavesiG1999,

title = {Analisi Sperimentale della Caratteristica Interna di una Turbomacchina ai Carichi Parziali},

author = {Guido Ardizzon, Giorgio Pavesi},

year  = {1999},

date = {1999-01-01},

urldate = {1999-01-01},

booktitle = {MIS - MAC VI Metodi di Sperimentazione nelle Macchine},

pages = {63-74},

publisher = {SGE - Padova},

abstract = {Direct and reverse operation of three radial flow turbomachines at part load conditions are investigated in order to evaluate the energy exchange between runner and fluid. Recirculation phenomena that occur at low flowrates interact with the blade passages with a net exchange momentum which has to be supplied by the impeller in pump mode, while reducing the one transmitted to the rotor by the fluid in turbine mode. Partial flow characteristic curves are also influenced in both operation modes. In order to highlight the role played by backward flows on the performances, the runnerfluid energy transfer has been evaluated from both velocity and power measurements. In particular, leakage and windage losses have been segregated and measured. The experimental results show that when recirculation phenomena occur within the runner, the energy exchange obtained from angular momentum equation only represents the work done by the driving motor on the discharge flowrate in pump mode. While it represents the net energy transferred to the rotor by the driving flowrate in reverse mode, that is the mechanical work available on the shaft when internal recirculation losses are taken into account.},

keywords = {Losses, part load, Pump, Pump as Turbine, Turbine},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{PavesiGArdizzonG1997,

title = {Influenza degli Elementi Statorici sulle Prestazioni ai Carichi Parziali delle Turbomacchine Operatrici Centrifughe},

author = {Guido Ardizzon and Giuseppe Ventrone and Giorgio Pavesi},

editor = {SGE},

year  = {1997},

date = {1997-01-01},

urldate = {1997-01-01},

booktitle = {52° Congresso Nazionale ATI},

pages = {829 - 840},

abstract = {Vengono presentati i risultati di una ricerca volta ad accertare l’influenza della geometria degli organi statorici sullo sviluppo della ricircolazione che si manifesta all’ingresso e all’uscita di una girante operatrice centrifuga nel funzionamento ai carichi parziali. Le indagini sperimentali sono state condotte su una macchina modello alla quale è stato possibile rimuovere il diffusore palettato posto a valle della girante e modificare la geometria all’aspirazione inserendo, dapprima una schiera di pale radiali statoriche, e successivamente un diaframma con diametro interno opportuno. Parallelamente all’esplorazione del campo di moto all’ingresso e all’uscita della girante mediante sonde 3-D è stata eseguita una analisi del rumore rilevato da un trasduttore di pressione piezoelettrico posto a filo della corrente. Dal confronto dei risultati ottenuti con i due sistemi di misura è stato possibile appurare l’influenza degli elementi statorici sull’innesco della ricircolazione all’ingresso e all’uscita della girante, distinguere l’insorgere delle due forme di instabilità funzionale e valutare la loro interferenza sulle prestazioni della macchina.},

keywords = {part load, Pump, Pump Design},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1996a,

title = {Progettazione Parametrica nelle Turbomacchine},

author = {Guido Ardizzon and Giorgio Pavesi and Giuseppe Ventrone},

year  = {1996},

date = {1996-01-01},

urldate = {1996-01-01},

booktitle = {Turbomacchine 96},

pages = {195-205},

publisher = {SGE - Padova},

abstract = {La sempre maggiore varietà di obiettivi richiesti nella progettazione delle turbomacchine richiede algoritmi e metodologie che consentano un approccio sistematico al disegno costruttivo della macchina. Nella presente memoria verrà illustrato uno schema di calcolo che, partendo dai dati nominali di progetto (portata e scambio di energia), consente di dimensionare una turbomacchina controllando, anche nelle fasi preliminari, la forma della curva caratteristica H-Q, le condizioni di stallo, gli andamenti dell'NPSH e della potenza assorbita. Nella memoria vengono descritti 1 modelli impiegati e 1 risultati di alcune applicazioni.},

keywords = {Pump, Pump Design, Pump Optimization},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1996,

title = {Condizioni di Incidenza Ottimale nelle Turbomacchine},

author = {Guido Ardizzon and Giorgio Pavesi and Giuseppe Ventrone},

year  = {1996},

date = {1996-01-01},

urldate = {1996-01-01},

booktitle = {51° Congresso Nazionale ATI},

pages = {1285-1296},

publisher = {SGE - Padova},

abstract = {In order to determine the optimum incidence at the inlet of the runner vane system, rotation and through flow effects have been considered separately. The incoming flow appears to be somewhat distorted by impeller vorticity even when the relative velocity angle ant the vane angle are equal. When through flow only is considered, analysis shows that the angle of incidence is different from zero. Flow condition for optimum incidence must be so adjusted as to eliminate the streamline deviations at the runner inlet in both through flow and total flow. Results given by this procedure compare favourably with test conducted on a Francis turbine and with observations from other researchers.},

keywords = {Optimum Incidence, Pump, Turbine},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1996b,

title = {Ricircolazione nelle Giranti Centrifughe ai Carichi Parziali},

author = {Guido Ardizzon and Giorgio Pavesi and Giuseppe Ventrone},

year  = {1996},

date = {1996-01-01},

urldate = {1996-01-01},

booktitle = {51° Congresso Nazionale ATI},

pages = {1275-1283},

publisher = {SGE - Padova},

abstract = {Sono presentati i risultati di una ricerca sperimentale volta a descrivere la formazione e lo sviluppo del moto di ricircolazione che si manifesta ai carichi parziali all'ingresso delle pompe centrifughe. Le indagini sono state condotte su un modello al quale & stato possibile rimuovere l'organo di diffusione palettato al fine di escludere l'inteferenza della corrente con gli elementi statorici a valle della girante, pale di diffusione o voluta, sulle condizioni di ricircolo all'aspirazione. Il campo di moto all'ingresso è stato esplorato in più sezioni mediante sonde tridimensionali a 5 fori. L'elaborazione dei dati ha consentito di rilevare il carattere impulsivo del fenomeno e di quantificare la potenza dissipata nel moto di ricircolazione, oltre a evidenziare gli effetti di questo sulle prestazioni della macchina. I profili sperimentali di velocità, pressioni ed energia ottenuti possono costituire un efficace strumento per accertare l'attendibilità dei vari modelli suggeriti in letteratura per lo studio della ricircolazione},

keywords = {Back Flow, Pump, Recirculation},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1995b,

title = {Sull'Impiego del Coefficiente di sostentamento nella Progettazione delle Turbomacchine Radiali. Parte II - Valori Limite del Coefficiente di Sostentamento per le Giranti Centrifughe.},

author = {Guido Ardizzon and Giorgio Pavesi},

year  = {1995},

date = {1995-01-01},

urldate = {1995-01-01},

booktitle = {50° Congresso Nazionale ATI},

pages = {1529-1540},

publisher = {SGE - Padova},

abstract = {Sono determinati i valori dei coefficienti di sostentamento da assegnare in sede di progetto alle giranti a flusso centrifugo per prefissati gradienti interpalari della pressione. Particolare attenzione è rivolta all'influenza che la geometria del condotto meridiano esercita sul valore del coefficiente globale di sostentamento.},

keywords = {Pump, Pump Design},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1995a,

title = {Sull'Impiego del Coefficiente di sostentamento nella Progettazione delle Turbomacchine Radiali. Parte I - Sviluppo Teorico},

author = {Guido Ardizzon and Giorgio Pavesi},

year  = {1995},

date = {1995-01-01},

urldate = {1995-01-01},

booktitle = {50° Congresso Nazionale ATI},

pages = {1517-1528},

publisher = {SGE - Padova},

abstract = {E' esteso alle giranti a flusso radiale il procedimento di calcolo dei profili palari comunemente impiegato per le turbomacchine a flusso assiale. A tal fine, appropriati coefficienti di sostentamento sono definiti per il moto assoluto e per quelli determinati dal trasporto della portata e dalla velocità di rotazione della girante. Il valore di tali coefficienti consente di prevedere con attendibilità l'entità del carico palare che accompagna lo scambio di energia. Il loro impiego si rivela utile soprattutto nella fase preliminare di progetto, consentendo di confrontare efficacemente soluzioni alternative dello stesso problema.},

keywords = {Pump, Pump Design},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1994b,

title = {Caratterizzazione Sperimentale del Comportamento a Cavitazione delle Pompe Centrifughe: Confronto fra Metodologie Convenzionali e Tecniche di Analisi Acustica},

author = {Guido Ardizzon and Giorgio Pavesi},

year  = {1994},

date = {1994-01-01},

urldate = {1994-01-01},

booktitle = {49° Congresso Nazionale ATI},

pages = {1559-1570},

publisher = {SGE - Padova},

abstract = {Vengono presentati i risultati di una ricerca sperimentale volta a caratterizzare il comportamento in regime di cavitazione di due pompe centrifughe. L'insorgere e l'evolvere della cavitazione sono analizzati mediante lo studio degli spettri del rumore prodotto dall'implosione delle bolle. I valori dell'NPSH di innesco e quelli corrispondenti a prefissate cadute della prevalenza sono tra loro confrontati e i diversi andamenti esaminati sulla base della geometria del bordo di ingresso delle pale e delle condizioni di deflusso.},

keywords = {Acustic Cavitation, Cavitation, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Ardizzon1994,

title = {Ottimizzazione della Geometria della Bocca di Aspirazione delle Pompe Centrifughe nei Riguardi dell'Innesco della Cavitazione},

author = {Guido Ardizzon and Giorgio Pavesi},

year  = {1994},

date = {1994-01-01},

urldate = {1994-01-01},

booktitle = {49° Congresso Nazionale ATI},

pages = {1533-1544},

publisher = {SGE - Padova},

abstract = {E' presentato un procedimento per la definizione della geometria ottimale della bocca di aspirazione delle pompe centrifughe nei riguardi dell'innesco della cavitazione. A tal fine, le correlazioni che esprimono l'influenza dei parametri di progetto sulle condizioni di innesco sono finalizzate alla determinazione del diametro di imbocco della girante e all'analisi del comportamento fuori progetto della soluzione prescelta. L'intera procedura è discussa prendendo a riferimento una turbopompa di nota geometria e comportamento in regime di cavitazione.},

keywords = {Cavitation, Optimisation, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Pavesi1993,

title = {Sulla Progettazione delle Turbopompe Centrifughe nei Riguardi della Cavitazione},

author = {Giorgio Pavesi and Guido Ardizzon},

year  = {1993},

date = {1993-01-01},

urldate = {1993-01-01},

booktitle = {Congresso Nazionale "Macchine e Apparecchiature Idrauliche"},

pages = {543-562},

abstract = {Viene presentato un procedimento per l'ottimizzazione del comportamento delle turbopompe centrifughe nei riguardi della cavitazione incipiente. Allo scopo è debitamente valutato il contributo e la mutua influenza dei singoli parametri che condizionano il fenomeno. Sono, quindi, proposte delle relazioni che consentono un9agevole previsione dell9NPSH e. un9adeguata verifica delle scelte di progetto.},

keywords = {Cavitation, Pump, Pump Design},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{pop00058,

title = {On the choice of the vane curvature of centrifugal impellers},

author = {Giorgio Pavesi and Guido Ardizzon},

year  = {1992},

date = {1992-01-01},

urldate = {1992-01-01},

booktitle = {American Society of Mechanical Engineers, Petroleum Division (Publication) PD},

volume = {47},

pages = {31-38},

publisher = {American Society of Mechanical …},

abstract = {The Alzheimer's Disease Neuroimaging Initiative (ADNI) is an ongoing, longitudinal, multicenter study designed to develop clinical, imaging, genetic, and biochemical biomarkers for the early detection and tracking of Alzheimer's disease (AD). The study aimed to enroll 400 subjects with early mild cognitive impairment (MCI), 200 subjects with early AD, and 200 normal control subjects; $67 million funding was provided by both the public and private sectors, including the National Institute on Aging, 13 pharmaceutical companies, and 2 foundations that provided support through the Foundation for the National Institutes of Health. This article reviews all papers published since the inception of the initiative and summarizes the results as of February 2011. The major accomplishments of ADNI have been as follows: (1) the development of standardized methods for clinical tests, magnetic resonance imaging (MRI), positron emission tomography (PET), and cerebrospinal fluid (CSF) biomarkers in a multicenter setting; (2) elucidation of the patterns and rates of change of imaging and CSF biomarker measurements in control subjects, MCI patients, and AD patients. CSF biomarkers are consistent with disease trajectories predicted by beta-amyloid cascade (Hardy, J Alzheimers Dis 2006;9(Suppl 3):151-3) and tau-mediated neurodegeneration hypotheses for AD, whereas brain atrophy and hypometabolism levels show predicted patterns but exhibit differing rates of change depending on region and disease severity; (3) the assessment of alternative methods of diagnostic categorization. Currently, the best classifiers combine optimum features from multiple modalities, including MRI, [(18)F]-fluorodeoxyglucose-PET, CSF biomarkers, and clinical tests; (4) the development of methods for the early detection of AD. CSF biomarkers, beta-amyloid 42 and tau, as well as amyloid PET may reflect the earliest steps in AD pathology in mildly symptomatic or even nonsymptomatic subjects, and are leading candidates for the detection of AD in its preclinical stages; (5) the improvement of clinical trial efficiency through the identification of subjects most likely to undergo imminent future clinical decline and the use of more sensitive outcome measures to reduce sample sizes. Baseline cognitive and/or MRI measures generally predicted future decline better than other modalities, whereas MRI measures of change were shown to be the most efficient outcome measures; (6) the confirmation of the AD risk loci CLU, CR1, and PICALM and the identification of novel candidate risk loci; (7) worldwide impact through the establishment of ADNI-like programs in Europe, Asia, and Australia; (8) understanding the biology and pathobiology of normal aging, MCI, and AD through integration of ADNI biomarker data with clinical data from ADNI to stimulate research that will resolve controversies about competing hypotheses on the etiopathogenesis of AD, thereby advancing efforts to find disease-modifying drugs for AD; and (9) the establishment of infrastructure to allow sharing of all raw and processed data without embargo to interested scientific investigators throughout the world. The ADNI study was extended by a 2-year Grand Opportunities grant in 2009 and a renewal of ADNI (ADNI-2) in October 2010 through to 2016, with enrollment of an additional 550 participants},

keywords = {Blade Curvature, Pump},

pubstate = {published},

tppubtype = {inproceedings}

}

@inproceedings{Navarro1984,

title = {Scorrimento della Corrente Relativa nelle Giranti Operatrici},

author = {Gianpaolo Navarro and Giorgio Pavesi},

year  = {1984},

date = {1984-01-01},

urldate = {1984-01-01},

booktitle = {39° Congresso Nazionale dell'Associazione Termotecnica Italiana - ATI},

pages = {301-312},

publisher = {SGE - Padova},

abstract = {Si analizza l'effetto della deviazione della corrente fluida in una girante cen trifuga, dotata di pale aspirale logaritmica, e si calcola il valore adimensionale dell'altezza teorica Y; eseguendo operazioni sulle medie ponderate dei valori delle velocità, lungo i bordi di uscita e di ingresso della girante, ottenuti, al varia re della portata e del numero delle pale, dalle diverse indagini numeriche su super fici interpalari. Si confrontano poi questi risultati con quelli che si ottengono E dal calcolo del Y con le formule teoriche monodimensionali, proposte da vari autori. Si considera infine l'effetto dell'inversione della corrente fluida all'ingres so della girante, per portate diverse da quelle nominali.},

keywords = {Pump, Slip Factor},

pubstate = {published},

tppubtype = {inproceedings}

}