Numerical simulation on cavitation pressure fluctuation in centrifugal pump at low flow rate

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Meng, G.Q.Q.G.^1 ; Yan, X.F.^1 ; Wang, X.^1,2

Inner Mongolia Vocational College of Chemical Engineering, Hohhot-Inner-Mongolia

010070, China^1

Inner Mongolia University of Technology, Hohhot-Inner-Mongolia

010051, China^2

关键词: Blade pass frequencies;    Cavitation conditions;    Cavitation pressure;    Dominant frequency;    Harmonic frequency;    Periodic properties;    Pressure fluctuation;    Unsteady cavitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012024/pdf
DOI  :  10.1088/1755-1315/163/1/012024

来源: IOP

【 摘 要 】

The RNG κ- turbulence model and the modified mass transport cavitation model are applied to simulate the unsteady cavitation flows in a centrifugal pump at low flow rate. Unsteady cavitation flows analyses in centrifugal pump are focused mainly in the volute. The accuracy and reliability of the numerical model and method are demonstrated by the good agreement between with experimental and numerical values of the pump performance. 13 monitor points are positioned in the volute. The time domain and frequency domain of pressure fluctuations on monitor points are analyzed and discussed. Under different conditions, the pressure fluctuation at each monitoring positions has obvious periodic property. The intensity of pressure fluctuation gets stronger with the development of pump cavitation. The dominant frequency of pressure fluctuations in volute is the blade pass frequency (f BPF) and its harmonic frequency. Under cavitation condition, the pressure fluctuations is the most intense in the volute diffusion tube, and the maximum amplitudes is about 2∼3 times of non-cavitation. It is indicate that cavitation has a great influence on the outlet flow field of centrifugal pump.