Pressure pulsation characteristics and improvement methods of axial extension pump
LIU Zhiqiang1, ZHANG Yuquan1*, DAI Qingyun2, ZHENG Yuan1, WU Donglei1, WEI Wenqian1
1. School of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Qinhuai River Water Conservancy Project Management Office, Jiangsu Province, Nanjing, Jiangsu 210098, China
Abstract：In order to study the pressure pulsation characteristics of the axial extension tubular pump and its improvement methods, the CFD numerical simulation is applied to optimize the design of tubular pump by adding a deflector in the outlet channel, and the correctness of the numerical calculation method is verified by real machine test. The results show that the pressure pulsation and frequency domain characteristics of the original model and the optimized model pump under small flow conditions are worse than those under the rated conditions, but the pressure pulsation characteristics at the impeller inlet under different flow conditions are significantly affected by the rotating impeller. The pressure pulsation changes strongly under small flow conditions. The low-frequency components of the pressure pulsation at the impeller outlet and the rear guide vane outlet of the original model are obvious. The addition of a deflector can effectively reduce the variation pressure pulsation amplitude and low-frequency components at these two places. Under rated conditions, the periodic law of pressure pulsation is signi-ficant, and the deflector can effectively reduce the pressure pulsation amplitude and low-frequency components at the front guide vane inlet and the impeller inlet. Under different flow conditions, the vortex elimination effect of the deflector in the outlet flow channel is very significant.
