Crosssection unbalanced force amongimpellers of fivestage centrifugal pump
XIE Rongsheng1,2, TANG Fangping1, LI Shuailing3, SHI Lijian1, YANG Fan1
1.School of Hydraulic Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2.School of Machine-ry and Automobile Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, Zhejiang 310018, China; 3.Datong Saicheng Locomotive Equipment Co.Ltd., Xi′an Subsidiary, Xi′an, Shaanxi, 710045, China
In order to research the effects among impellers under the lateral flow condition and high rotating speed of the multistage centrifugal pump,a fivestage centrifugal pump serves as the study object. Based on the standard k-ε turbulent model and Reynolds Averaged Navier-Stokes equation, the hydraulic performance of the multistage centrifugal pump is simulated with the commercial CFD software. The result shows that as the stage of blade increases, the vorticity at the inlet of the pump and the unbalanced force among impellers increase, and the growth rate decreases under the same flow condition. [JP2]As the flow rate increases and the vorticity increases and the radial force decreases. The suction casing with side inlet has an effect at the velocity distribution at the inlet of all the impellers, thus inducing the flow field and pressure distribution to be asymmetric, and causing the force of each impeller to be different. Comparing the model test with the simulation result, the simulation result is bigger than the model test. The simulation result matches the model test better under the design flow condition than under the low flow condition. The minimum deviation is 178％ and the maximum is 717％. The result is of guidance significance for the design and assemble of multistage centrifugal pump.
ZHANG Desheng, WANG Jing, SHI Weidong, et al. Unbalance response characteristics of rotor system in high pressure multi stage pump[J]. Journal of drainage and irrigation machinery engineering,2014,32(1):17-22.(in Chinese)