Vibration and flow characteristics near cavitation occurrence in mixed-flow pump

29th IAHR Symposium on Hydraulic Machinery and Systems

Yang, H.M.^1 ; Lee, K.Y.^1 ; Kim, J.H.^1 ; Choi, Y.S.^1

Thermal and Fluid Systems Group, Korea Institute of Industrial Technology, 89 Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Cheonan-si

31056, Korea, Republic of^1

关键词: Blade passing frequency;    Flow charac-teristics;    Reynolds Averaged Navier-Stokes Equations;    Shear-stress transport;    Steady state and transients;    Three axis accelerometers;    Turbulence kinetic energy;    Vibration characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062032/pdf
DOI  :  10.1088/1755-1315/240/6/062032

来源: IOP

【 摘 要 】

Cavitation phenomena in a mixed-flow pump are studied using computational fluid dynamics and experiment. Steady-state and transient analyses are conducted using three-dimensional Reynolds-averaged Navier-Stokes equations with a turbulence kinetic energy-specific rate of dissipation (k-ω)-based shear stress transport turbulence model and the homogeneous cavitation model. To observe the pressure fluctuation, five points are monitored during computation. In experiment, a three-axis accelerometer is used for cavitation detection and the vibration characteristics are analyzed. When cavitation occurs, the pressure and vibration magnitudes fluctuate considerably near the blade passing frequency.