Numerical investigation on the mechanism of impeller hub corner separation flow and induced energy loss in the bulb tubular pump  

作　　者：Long-yue Sun Qiang Pan De-sheng Zhang Rui-jie Zhao B.P.M.(Bart)van Esch 

机构地区：[1]Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang,212013,China [2]Wenling Fluid Machinery Technology Institute of Jiangsu University,Wenling,317525,China [3]Department of Mechanical Engineering,Eindhoven University of Technology,Eindhoven,The Netherlands [4]Shimge Pump Industry(Zhejiang)Co.,Ltd.,Wenling,317525,China

出　　处：《Journal of Hydrodynamics》2023年第2期252-267,共16页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51979125,52209111 and U2016225).

摘　　要：Impeller hub corner separation flow(IHCS)has a significant influence on energy conversion of the bulb tubular pump,and its unsteady characteristics are investigated with CFD-based method.The generation mechanism and power loss characteristics of IHCS are investigated by the entropy production method and pressure fluctuation analysis.The main cause can be attributed to the large transverse pressure gradient near the hub at the trailing edge of the impeller,which is aggravated by the circumferential movement trend and the diffuser reverse flow,while the IHCS is significantly weakened with increased flow rate.The undesirable flow behavior is more likely to cause a significant increase in energy loss near the hub region compared to that in the rim region.The relative vortex stretching induced by the velocity gradient is the main cause of the horn-like vortex(HLV),and its intensity and resulting energy loss tend to decrease along the vortex trajectory.The HLV changes the dominant frequency of the pressure fluctuations in the nearby flow field,the value of which increases from 1fr(the blade passing frequency)to 2fr with increased amplitude,mainly due to the lower pressure regions on the impeller suction surface(SS)and HLV vortex core.Due to the effect of rotor-stator interaction(RSI),the HLVs generated between two adjacent impeller blades are cut into several sections by the diffuser vanes and propagate and dissipate along the mainstream direction.

关 键 词：Bulb tubular pump corner separation entropy production pressure fluctuation visualization analysis 

分 类 号：O35[理学—流体力学]