Influence of Piston Number on Churning Losses in Axial Piston Pumps  

作　　者：Ying Li Xing Chen Hao Luo Junhui Zhang Jin Zhang 

机构地区：[1]School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China [2]State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,Hangzhou 310027,China

出　　处：《Chinese Journal of Mechanical Engineering》2022年第5期194-207,共14页中国机械工程学报（英文版）

基　　金：National Natural Science Foundation of China(Grant No.52005429);Open Foundation of State Key Laboratory of Fluid Power and Mechatronic Systems of China(Grant No.GZKF-201911);National Key Research and Development Program of China(Grant No.2018YFB2000703).

摘　　要：Raising the rotational speed of an axial piston pump is useful for improving its power density;however,the churning losses of the piston increase significantly with increasing speed,and this reduces the performance and efficiency of the axial piston pump.Currently,there has been some research on the churning losses of pistons;however,it has rarely been analyzed from the perspective of the piston number.To improve the performance and efficiency of the axial piston pump,a computational fluid dynamics(CFD)simulation model of the churning loss was established,and the effect of piston number on the churning loss was studied in detail.The simulation analysis results revealed that the churning losses initially increased as the number of pistons increased;however,when the number of pistons increased from six to nine,the torque of the churning losses decreased because of the hydrodynamic shadowing effect.In addition,in the analysis of cavitation results,it was determined that the cavitation area of the axial piston pump was mainly concentrated around the piston,and the cavitation became increasingly severe as the speed increased.By comparing the simulation results with and without the cavitation model,it was observed that the cavitation phenomenon is beneficial for the reduction of churning losses.In this study,a piston churning loss test rig that can eliminate other friction losses was established to verify the accuracy of the simulation results.A comparative analysis indicated that the simulation results were consistent with the actual situation.In addition,this study also conducted a simulation study on seven and nine piston pumps with the same displacement.The simulation results revealed that churning losses of the seven pistons were generally greater than those of the nine pistons under the same displacement.In addition,regarding the same piston number and displacement,reducing the pitch circle radius of piston bores is effective in reducing the churning loss.This research analyzes the effect of piston number on the

关 键 词：Axial piston pumps Churning losses PISTONS CFD simulations Experimental study 

分 类 号：TH137.51[机械工程—机械制造及自动化]