基于动网格的单作用滑片泵流量特性分析.pdf

14
FL UID MACHINERY
Vol.39,No.8,2011
文章编号:1005-0329(2011)08-0014-05
设计计算
基于动网格的单作用滑片泵流量恃性分析
邵飞,孔繁余,王文廷,周水清
江苏大学,江苏镇江.212013)
摘要:采用CFD动网格技术和编译白定义函数,并结合SSNk-s湍流模型对单作用滑片泵泵内部流场进行非定常
数值馍拟,得到了在不同输送介质和泵体结构下,泵内部瞬时流量和监测点压力脉动情况,并分析了流量脉动产生的原
因。结果表明:动网格技术模拟结果可清晰地描述工作腔内部的瞬时流量和压力的变化情况;合理设计配流盘转角和V
型槽的结构,可有效地控制瞬时流量脉动和压力脉动;随着滑片数的增加,瞬时流量脉动幅度有减小的趋势,选取奇数滑
片更有利于泵流量的稳定;输送介质的体积弹性模量也是影响涴量梼性的重要因素之
关键词:单作用滑片泵;流量特性;动网格;数值模拟
中图分类号:TH311
文献标识码:A
doi:10.3969/j.jiss.1005-0329.201.08.004
Analysis of Flow Characteristic in Single-acting Vane Pump base on Dynamic Mesh Method
SHAO Fei, KONG Fan-yu, WANG Wen-ting, ZHOU Shui-ging
Jiangsu University, Zhenjiang 212013, China
Abstract: A numerical simulation to the transient flow field of single-acting vane pump is performed by using dynamic mesh
method and user defined function with shear stress transport turbulent(SST) models. The details of transient flow characteristic
and pressure fluctuation are investigated, and the reasons of generating flow fluctuation are analyzed and testified. The results
show that the stability of the flow rate and pressure of single-acting vane um could e estimated and described by the numeri-
cal simulation. Flow and pressure Fluctuation can be reduced by appropriately designing the corner of port plate and the structure
of V -shaped roove. With using structure of more and odd number vanes, the range of flow fluctuation will be decreased and
flow rate of pump will be benefited for stability. The bulk modulus of elasticity of pumped medium is also an important factor in
impacting the flow characteristic of pump
Key words: single-acting vane pump; flow characteristic; dynamic mesh numerical simulation
1前言
数学模型求解排油腔的几何容积变化率,考虑
配流盘腰槽间隔角以及液体的可压缩性质,通
单作用滑片泵的流量脉动是整个液压系统存过仿真计算求解瞬时流量波形图以及流量不均
在的压力和流量脉动的根源,且会引发噪声、振匀系数2。由于液体的理论歸时流量是非线
动,不利于液压系统长期稳定的工作,因此很有必性方程,只能通过计算机求得瞬时流量的近似
要研究滑片泵的流量脉动机理、规律,从而采取解。
有效措施降低流量脉动及其引发的其他不稳定
计算流体动力学(CFD)的飞速发展,使得原
因素。研究滑片泵瞬时流量的方法普遍为通过来主要借助于基本的理论分析和大量物理模型试
收稿日期:2010-12-
基金项目:国家科技支撑计划(2008BFA34B10)