Pressure fluctuation characteristics induced by cavitation in a centrifugal pump

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

Wang, W.T.^1 ; Lu, H.^2 ; Meng, G.Q.Q.G.^1

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

010070, China^1

Baotou Light Industry Vocational Technical College, Baotou-Inner-Mongolia

014035, China^2

关键词: Calculation results;    Cavitation conditions;    Dominant frequency;    Flow charac-teristics;    Optimization design;    Pressure fluctuation;    Rotating frequencies;    Unsteady cavitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012040/pdf
DOI  :  10.1088/1755-1315/163/1/012040

来源: IOP

【 摘 要 】

The unsteady cavitation flows in a centrifugal pump are numerically simulated by using the RNG k- turbulence model and the improved mass transport cavitation model. The calculated data is in good agreement with the experimental results, so the numerical modal and method can accurately predict the cavitation flows in a centrifugal pump. The flow characteristics without and with cavitation are analyzed by setting 15 monitoring points in the impeller. The calculation results indicated that the dominant frequencies of pressure fluctuations in impeller is the impeller rotating frequency f i and 2f i, the impeller rotating frequency always played the dominant role. Under non-cavitation condition, the maximum value of pressure fluctuation amplitudes appears at impeller outlet. Under cavitation condition, the maximum value of pressure fluctuation amplitudes appears near 4/5 blade length from blade inlet. The shedding and collapsing of cavitation bubbles in impeller, which disturbs the flow field of pump impeller and causes the amplitude of pressure fluctuations increase. This research provided a reference for optimization design of impeller in centrifugal pump.