Numerical analysis of internal flow characteristic and pressure fluctuation of multistage vortex pump
BI Zhen1, LI Rennian1,2, LI Yibin1,2, XIAO Liqian1
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Fluid Machinery and Systems of Gansu Province, Lanzhou, Gansu 730050, China
Abstract：In order to reveal pressure fluctuation characteristics of internal fluid field′s structures in vortex pump, a multistage side pump with unshrouded impellers and closed runners was developed. Based on RNG k-ω turbulence model, SIMPLEC algorithm and structural grid, numerical simulations and experimental tests of the vortex pump were conducted. The external characteristic predictions indicated that the pump performance meet design requirements. Based on numerical simulation techniques, the internal flow field in the vortex pump was simulated. The results show that the vortex pump′s head has the tendency of plunge and at the same time blade power capacity becomes worse, blade pressurizing ability to liquid decreases gradually. Inside the blade runner of impeller inlet and outlet, degrees of velocity and turbulence energy distribution change sharply, velocity and turbulence energy distributions in other blade runners are very much alike. Inside the middle of impeller blade tip flow channel exists a low velocity region and the region becomes smaller and smaller with the flow rate increasing gradually. Inside the middle of impeller blade root flow channel exists a concentration zone of velocity gradient, in which the turbulence kinetic energy is larger, namely there exists a larger dissipation loss area in impeller blade root flow channel, and it is becoming smaller with the increasing of flow rate. Analysis of pressure fluctuation characteristics in vortex pump′s characteristic locations found that at different monitoring locations of impeller blades and closed runners, pressure fluctuation frequency characteristics are more obvious, where obvious hydraulic vibration and noise can be induced. The results reveal the impact mechanism of internal fields and performance of vortex pump, which provides a theoretical basis for vortex pump′s design.
毕祯, 李仁年,, 黎义斌,, 肖丽倩. 多级旋涡泵内部流动特性与压力脉动的数值分析[J]. 排灌机械工程学报, 2016, 34(10): 871-877.
BI Zhen, LI Rennian,, LI Yibin,, XIAO Liqian. Numerical analysis of internal flow characteristic and pressure fluctuation of multistage vortex pump. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(10): 871-877.
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