2008
Pavesi, Giorgio; Cavazzini, Giovanna; Ardizzon, Guido
A Time-Frequency Post-Processing Technique for Characterization of the Unsteady Phenomena in the Turbomachines. Proceedings Article
In: XIX Biannual Symposium on Measuring Techniques in Turbomachinery Transonic and Supersonic Flow in Cascades and Turbomachines, pp. 1-5, 2008.
Abstract | BibTeX | Tags: Pump, Rotating Stall, Unsteady pressure, Wavelets
@inproceedings{Pavesi2008c,
title = {A Time-Frequency Post-Processing Technique for Characterization of the Unsteady Phenomena in the Turbomachines.},
author = {Giorgio Pavesi and Giovanna Cavazzini and Guido Ardizzon},
year = {2008},
date = {2008-01-01},
urldate = {2008-01-01},
booktitle = {XIX Biannual Symposium on Measuring Techniques in Turbomachinery Transonic and Supersonic Flow in Cascades and Turbomachines},
volume = {MTT1908-A6},
pages = {1-5},
abstract = {This paper presented a data processing technique that combines different signal analyses for the spectral characterization of the unsteady phenomena developing in the turbomachines. Tools of the classical Fourier analysis, such as second order spectra, were combined with tools of the time-frequency analysis (wavelets, cross-wavelet, coherence wavelet functions) to identify unsteady phenomena, to define their spectral structure, to analyse their evolution in time and to determine their possible propagation direction and velocity. Because of the non-linearity of several unsteady phenomena developing in turbomachines, high-order moment functions were applied to discriminate between non-linearly coupled pulsations and self-excited pulsations and to determine the fraction of the power of each pulsation that was due to the non-linear interaction of unsteady phenomena.},
keywords = {Pump, Rotating Stall, Unsteady pressure, Wavelets},
pubstate = {published},
tppubtype = {inproceedings}
}
This paper presented a data processing technique that combines different signal analyses for the spectral characterization of the unsteady phenomena developing in the turbomachines. Tools of the classical Fourier analysis, such as second order spectra, were combined with tools of the time-frequency analysis (wavelets, cross-wavelet, coherence wavelet functions) to identify unsteady phenomena, to define their spectral structure, to analyse their evolution in time and to determine their possible propagation direction and velocity. Because of the non-linearity of several unsteady phenomena developing in turbomachines, high-order moment functions were applied to discriminate between non-linearly coupled pulsations and self-excited pulsations and to determine the fraction of the power of each pulsation that was due to the non-linear interaction of unsteady phenomena.
Pavesi, Giorgio; Cavazzini, Giovanna; Ardizzon, Guido
Time-frequency characterization of the unsteady phenomena in a centrifugal pump Journal Article
In: International Journal of Heat and Fluid Flow, vol. 29, iss. 5, pp. 1527-1540, 2008, ISSN: 0142727X.
Abstract | Links | BibTeX | Tags: Pump, Rotating Stall, Unsteady pressure, Wavelets
@article{Pavesi2008a,
title = {Time-frequency characterization of the unsteady phenomena in a centrifugal pump},
author = {Giorgio Pavesi and Giovanna Cavazzini and Guido Ardizzon},
doi = {10.1016/j.ijheatfluidflow.2008.06.008},
issn = {0142727X},
year = {2008},
date = {2008-01-01},
journal = {International Journal of Heat and Fluid Flow},
volume = {29},
issue = {5},
pages = {1527-1540},
abstract = {The paper presents an experimental investigation of the flow field instability in a centrifugal pump. Pressure fluctuations were measured with transducers placed flush with the inlet duct, and at the impeller discharge. Two impeller rotation speeds were utilized in the study, as well as several angular and radial transducer positions at design, and at off-design flow rates. A spectral analysis was carried out on the pressure signals in frequency and in time-frequency domains. The results highlighted the existence of an asymmetrical rotating pressure structure at the impeller discharge, having a fluid-dynamical origin and propagating both in the radial and circumferential direction, inside and downstream of the impeller. © 2008 Elsevier Inc. All rights reserved.},
keywords = {Pump, Rotating Stall, Unsteady pressure, Wavelets},
pubstate = {published},
tppubtype = {article}
}
The paper presents an experimental investigation of the flow field instability in a centrifugal pump. Pressure fluctuations were measured with transducers placed flush with the inlet duct, and at the impeller discharge. Two impeller rotation speeds were utilized in the study, as well as several angular and radial transducer positions at design, and at off-design flow rates. A spectral analysis was carried out on the pressure signals in frequency and in time-frequency domains. The results highlighted the existence of an asymmetrical rotating pressure structure at the impeller discharge, having a fluid-dynamical origin and propagating both in the radial and circumferential direction, inside and downstream of the impeller. © 2008 Elsevier Inc. All rights reserved.
Pavesi, Giorgio; Cavazzini, Giovanna; Ardizzon, Guido
Time-frequency characterization of rotating instabilities in a centrifugal pump with a vaned diffuser Journal Article
In: International journal of rotating …, vol. 29, iss. 5, pp. 1527-1540, 2008, ISSN: 0142727X.
Abstract | Links | BibTeX | Tags: Pump, Rotating Stall, Unsteady pressure, Wavelets
@article{pop00038,
title = {Time-frequency characterization of rotating instabilities in a centrifugal pump with a vaned diffuser},
author = {Giorgio Pavesi and Giovanna Cavazzini and Guido Ardizzon},
url = {https://www.hindawi.com/journals/ijrm/2008/202179/abs/ http://www.sciencedirect.com/science/article/pii/S0142727X08001124},
doi = {10.1016/j.ijheatfluidflow.2008.06.008},
issn = {0142727X},
year = {2008},
date = {2008-01-01},
urldate = {2008-01-01},
journal = {International journal of rotating …},
volume = {29},
issue = {5},
pages = {1527-1540},
publisher = {hindawi.com},
abstract = {The paper presents an experimental investigation of the flow field instability in a centrifugal pump. Pressure fluctuations were measured with transducers placed flush with the inlet duct, and at the impeller discharge. Two impeller rotation speeds were utilized in the study, as well as several angular and radial transducer positions at design, and at off-design flow rates. A spectral analysis was carried out on the pressure signals in frequency and in time-frequency domains. The results highlighted the existence of an asymmetrical rotating pressure structure at the impeller discharge, having a fluid-dynamical origin and propagating both in the radial and circumferential direction, inside and downstream of the impeller. © 2008 Elsevier Inc. All rights reserved.},
keywords = {Pump, Rotating Stall, Unsteady pressure, Wavelets},
pubstate = {published},
tppubtype = {article}
}
The paper presents an experimental investigation of the flow field instability in a centrifugal pump. Pressure fluctuations were measured with transducers placed flush with the inlet duct, and at the impeller discharge. Two impeller rotation speeds were utilized in the study, as well as several angular and radial transducer positions at design, and at off-design flow rates. A spectral analysis was carried out on the pressure signals in frequency and in time-frequency domains. The results highlighted the existence of an asymmetrical rotating pressure structure at the impeller discharge, having a fluid-dynamical origin and propagating both in the radial and circumferential direction, inside and downstream of the impeller. © 2008 Elsevier Inc. All rights reserved.
