Publications

@article{Pei2019a,

title = {Experimental investigation of the nonlinear pressure fluctuations in a residual heat removal pump},

author = {Ji Pei and Wenjie Wang and Giorgio Pavesi and Majeed Koranteng Osman and Fan Meng},

url = {https://doi.org/10.1016/j.anucene.2019.03.025},

doi = {10.1016/j.anucene.2019.03.025},

issn = {18732100},

year  = {2019},

date = {2019-01-01},

journal = {Annals of Nuclear Energy},

volume = {131},

pages = {63-79},

publisher = {Elsevier Ltd},

abstract = {Residual Heat Removal Pumps have very strict requirements to maintain nuclear power plant safety and therefore unsteady pump operations are very critical in determining system reliability. The operational stability has however been affected by pressure pulsations that are induced by rotor-stator interactions. A pressure measurement test was undertaken to investigate the nonlinear pressure fluctuation characteristics at angular and axial positions within the annular volute wall. Diametric mode and bispectrum analysis were subsequently applied to reveal the dominant frequencies of the pressure pulsations induced at the stationary parts, and also to analyze the nonlinear frequencies in the frequency domain due to the impeller-diffuser and diffuser-volute interactions. The pressure pulsations on the volute wall were significantly affected not only by the flow rate, but also by the sensors’ position. The highest amplitude was observed at a frequency that was four-fold the blade-passing frequency at a diameter mode of 1. When the flow rate increased, the amplitude of the high harmonics of the blade-passing frequency increased, whereas the amplitudes of the blade-passing and shaft rotating frequencies decreased. In the axial direction, flow rate greatly influenced the propagation of pressure fluctuations whose dominant frequency are blade-passing frequency, vane-passing frequency and their high harmonics. The spectral domain was dominated by high harmonics of the blade-passing frequency (3St and 4St). Conversely, the circumferential pressure fluctuation was significantly affected by rotor-stator interaction and was independent of flow rate. The study provided sufficient information for further work to reduce pressure pulsations in the residual heat removal pump.},

keywords = {Bispectrum analysis, Blade-passing frequency, Diameter mode, Nonlinear pressure pulsation, Rotor Stator Interaction},

pubstate = {published},

tppubtype = {article}

}

@article{pop00034,

title = {Analysis of the Rotor-Stator Interaction in a Radial Flow Pump},

author = {Giovanna Cavazzini and Giorgio Pavesi and Guido Ardizzon and P. Dupont and S. Coudert and Guy Caignaert and Gerard Bois},

url = {http://www.shf-lhb.org/articles/lhb/abs/2009/05/lhb2009067/lhb2009067.html},

doi = {10.1051/lhb/2009067},

issn = {0018-6368},

year  = {2009},

date = {2009-01-01},

urldate = {2009-01-01},

journal = {La Houille Blanche},

issue = {5},

pages = {141-151},

publisher = {shf-lhb.org},

abstract = {The paper presents the analysis of the interactions between the impeller and the vaned diffuser of a radial flow pump. Experimental data were obtained within one blade passage of a vaned diffuser using the 2D/2C PIV technique. The diffuser flow field was analyzed in various measuring planes in the hub to shroud direction, for seven relative impeller positions in the diffuser frame and in four different operating conditions. A post-processing procedure, based on statistical tools, was applied to the experimental results so as to validate their meaningfulness. The experimental results were compared to numerical data obtained with the help of CFX compu- ter code.},

keywords = {Flow instability, Rotor Stator Interaction},

pubstate = {published},

tppubtype = {article}

}