基于计算流体仿真的双作用叶片泵气蚀机理分析

doi:10.13229/j.cnki.jdxbgxb20200040

摘要/Abstract

摘要：

双作用叶片泵在高转速工况下，其高压油液出口三角槽附近易发生空化现象，严重时会发生气蚀，破坏配流盘表面，带来尖锐的噪声并缩短叶片泵的使用寿命。本文针对双作用叶片泵的空化气蚀现象，利用计算流体力学仿真分析，对双作用叶片泵流场进行建模分析。引入动网格技术并通过用户自定义函数对叶片绕定子转动的运动规律进行约束，实现对双作用叶片泵流场动态特性的分析。在不同转速和压力条件下，计算分析双作用叶片泵流场的压力分布及速度矢量分布，得出配流盘发生气蚀的原因是配流副间隙内局部低压流场的存在，其发生位置在配流盘高压出口容腔三角槽前方，与实际试验具有一致性。

关键词: 计算流体力学, 双作用叶片泵, 动网格技术, 气蚀, 用户自定义函数

Abstract:

Under high-pressure and high-speed working condition， double-acting vane pumps are prone to cavitation near damping grooves of the high-pressure oil outlet. In severe cases， cavitation could destroy surface of the valve plate， bring sharp noise and decreasing the service life. In order to figure out the cavitation mechanism， the Computational Fluid Dynamics （CFD） simulation method was used to model and analyze the internal flow field in a double-acting vane pump. The dynamic grid technique was applied to define the boundary motion of the rotor and rollers through the user-defined function （UDF）. The fluid dynamic characteristics of velocity field and pressure field were calculated and analyzed under different rotational speed and system pressure. Furthermore， the occurrence of the cavitation was analyzed. Because of the existence of a local low-pressure flow field inside the oil gap between the rotor and valve plate， the cavitation occurred in front of the triangular damping groove of the high-pressure outlet cavity. Comparing the simulation results with the experiment ones， it shows good accuracy and reliability.

Key words: computational fluid dynamics, double-acting vane pump, dynamic grid technology, cavitation, user-defined function

中图分类号:

TQ021.1

张斌,程国赞,洪昊岑,赵春晓,杨华勇. 基于计算流体仿真的双作用叶片泵气蚀机理分析[J]. 吉林大学学报(工学版), 2021, 51(3): 831-839.

Bin ZHANG,Guo-zan CHENG,Hao-cen HONG,Chun-Xiao ZHAO,Hua-yong YANG. Cavitation mechanism of double⁃acting vane pump based on computational fluid dynamics simulation method[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 831-839.

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出口压力/MPa	气相百分比/%
6	99.98
8	99.97
12	99.96