2019
Mao, Xiuli; Pavesi, Giorgio; Chen, Diyi; Xu, Hengshan; Mao, Gaojun
Flow induced noise characterization of pump turbine in continuous and intermittent load rejection processes Journal Article
In: Renewable Energy, vol. 139, pp. 1029-1039, 2019, ISSN: 18790682.
Abstract | Links | BibTeX | Tags: Flow induced noise, Hydroelectric energy, Load rejection, Pressure fluctuations, Pump as Turbine
@article{Mao2019a,
title = {Flow induced noise characterization of pump turbine in continuous and intermittent load rejection processes},
author = {Xiuli Mao and Giorgio Pavesi and Diyi Chen and Hengshan Xu and Gaojun Mao},
url = {https://doi.org/10.1016/j.renene.2019.02.116},
doi = {10.1016/j.renene.2019.02.116},
issn = {18790682},
year = {2019},
date = {2019-01-01},
journal = {Renewable Energy},
volume = {139},
pages = {1029-1039},
publisher = {Elsevier Ltd},
abstract = {In order to study pump turbine stability in view of flow induced noise, this paper focuses on two-part operation of one high head reversible turbine: transient load rejection process and intermittent vane closing conditions. Both above simulations are solved by DES turbulent model, additionally, the flow field results are regarded as sound source and analyzed comparatively by LMS software. Except for flow field interpretation, some developing rules of flow induced noise during the period of pump turbine load rejection are found. The result indicates that flow induced noise radiation is consistent with internal fluid characteristics, and the developing trends are similar which acquired from these two part calculations, whereas the values are distinct. This work provides a reference for the study of pump turbine operating stability from the acoustic aspect, and for pump turbine design work as well.},
keywords = {Flow induced noise, Hydroelectric energy, Load rejection, Pressure fluctuations, Pump as Turbine},
pubstate = {published},
tppubtype = {article}
}
In order to study pump turbine stability in view of flow induced noise, this paper focuses on two-part operation of one high head reversible turbine: transient load rejection process and intermittent vane closing conditions. Both above simulations are solved by DES turbulent model, additionally, the flow field results are regarded as sound source and analyzed comparatively by LMS software. Except for flow field interpretation, some developing rules of flow induced noise during the period of pump turbine load rejection are found. The result indicates that flow induced noise radiation is consistent with internal fluid characteristics, and the developing trends are similar which acquired from these two part calculations, whereas the values are distinct. This work provides a reference for the study of pump turbine operating stability from the acoustic aspect, and for pump turbine design work as well.
2013
Yang, Jun; Pavesi, Giorgio; Cavazzini, Giovanna; Yuan, Shouqi Q.
Numerical characterization of pressure instabilities in a vaned centrifugal pump under partload condition Proceedings Article
In: IOP Conference Series: Materials Science and Engineering, pp. 022-044, iopscience.iop.org, 2013, ISSN: 17578981.
Abstract | Links | BibTeX | Tags: Francis-type Reversible Turbine, hump-instability region, Pressure fluctuations
@inproceedings{pop00020,
title = {Numerical characterization of pressure instabilities in a vaned centrifugal pump under partload condition},
author = {Jun Yang and Giorgio Pavesi and Giovanna Cavazzini and Shouqi Q. Yuan},
url = {http://iopscience.iop.org/article/10.1088/1757-899X/52/2/022044/meta http://stacks.iop.org/1757-899X/52/i=2/a=022044?key=crossref.51f7846194288a9a6286cc200d28e156},
doi = {10.1088/1757-899X/52/2/022044},
issn = {17578981},
year = {2013},
date = {2013-01-01},
urldate = {2013-01-01},
booktitle = {IOP Conference Series: Materials Science and Engineering},
volume = {52},
issue = {2},
pages = {022-044},
publisher = {iopscience.iop.org},
abstract = {This paper studies the hysteresis/saddle phenomena of the head-drop in a scaled model pump turbine using CFD methods. This lag was induced by complicated flow patterns, which influenced the reliability of rotating machine that was analysed by a commercial code with DES model for computing turbulence. Analyses were carried out on the pressure signals both in frequency and time-frequency domains at full and part load conditions. The results highlighted the remarkable interaction between the unsteady structures in diffuser and return. © Published under licence by IOP Publishing Ltd.},
keywords = {Francis-type Reversible Turbine, hump-instability region, Pressure fluctuations},
pubstate = {published},
tppubtype = {inproceedings}
}
This paper studies the hysteresis/saddle phenomena of the head-drop in a scaled model pump turbine using CFD methods. This lag was induced by complicated flow patterns, which influenced the reliability of rotating machine that was analysed by a commercial code with DES model for computing turbulence. Analyses were carried out on the pressure signals both in frequency and time-frequency domains at full and part load conditions. The results highlighted the remarkable interaction between the unsteady structures in diffuser and return. © Published under licence by IOP Publishing Ltd.
2010
Pavesi, Giorgio; Cavazzini, Giovanna; Ardizzon, Guido
Time–Frequency Characterization of a Rotating Multi-Lobes Pressure Fluctuation in a Centrifugal Vaned Pump: Experimental Investigation Proceedings Article
In: 13th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery 2010, ISROMAC-13, pp. 1-8, 2010, ISBN: 9781617388484.
Abstract | BibTeX | Tags: Francis-type Reversible Turbine, Pressure fluctuations, Pump as Turbine
@inproceedings{Pavesi2010a,
title = {Time–Frequency Characterization of a Rotating Multi-Lobes Pressure Fluctuation in a Centrifugal Vaned Pump: Experimental Investigation},
author = {Giorgio Pavesi and Giovanna Cavazzini and Guido Ardizzon},
isbn = {9781617388484},
year = {2010},
date = {2010-01-01},
urldate = {2010-01-01},
booktitle = {13th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery 2010, ISROMAC-13},
pages = {1-8},
abstract = {This paper presents experimental investigations of the unsteady phenomena developing in a centrifugal vaned pump. Miniaturized pressure transducers were mounted flushed with the walls on one diffuser blade, in the inlet duct and at the impeller discharge, at different radial and circumferential positions. The analysis was carried out at several flow rates and at two different impeller rotation velocities. The influence of the operating conditions, the presence of diffuser blades on the existence, and the characteristics of the unsteady phenomena were studied. Linear spectral analysis techniques were applied both in frequency and in the time-frequency domains in order to define the pressure signals spectral content and its evolution in time. Moreover, the possible presence of mechanisms of non-linear interaction between pressure pulsations was studied applying functions of the high-order spectral analysis so as to discriminate between fundamental frequency and coupled pulsations due to the interaction between the phenomena. The existence of a rotating multi-lobes pressure structure at the impeller discharge, having fluid-dynamical origin, was demonstrated. This instability was verified to propagate both inside and downstream the impeller. Copyright ? 2010 by ISROMAC-13.},
keywords = {Francis-type Reversible Turbine, Pressure fluctuations, Pump as Turbine},
pubstate = {published},
tppubtype = {inproceedings}
}
This paper presents experimental investigations of the unsteady phenomena developing in a centrifugal vaned pump. Miniaturized pressure transducers were mounted flushed with the walls on one diffuser blade, in the inlet duct and at the impeller discharge, at different radial and circumferential positions. The analysis was carried out at several flow rates and at two different impeller rotation velocities. The influence of the operating conditions, the presence of diffuser blades on the existence, and the characteristics of the unsteady phenomena were studied. Linear spectral analysis techniques were applied both in frequency and in the time-frequency domains in order to define the pressure signals spectral content and its evolution in time. Moreover, the possible presence of mechanisms of non-linear interaction between pressure pulsations was studied applying functions of the high-order spectral analysis so as to discriminate between fundamental frequency and coupled pulsations due to the interaction between the phenomena. The existence of a rotating multi-lobes pressure structure at the impeller discharge, having fluid-dynamical origin, was demonstrated. This instability was verified to propagate both inside and downstream the impeller. Copyright ? 2010 by ISROMAC-13.
