滚动活塞压缩机供油系统计算流体动力学分析

Computational Fluid Dynamics Analysis on Oil Pumping System for Rolling Piston Compressors

采用计算流体动力学(CFD)软件对滚动活塞压缩机供油系统进行了数值模拟,建立了供油系统的物理模型,提出了处理边界条件和计算活塞端面泄漏的方法,并将供油系统的动态过程转化为静态过程.通过实验测量了主轴承的供油量,以验证模型的合理性;通过计算分析了压缩机运行工况、壳体内油池油面高度、压缩机供油系统主要设计参数对供油特性的影响.结果表明:活塞端面泄漏量主要取决于压缩机运行工况;油池油面高度对供油系统供油量影响显著;在压缩机运行工况及油池油面高度一定的情况下,主轴承螺旋油槽的截面形状和倾斜角决定着主轴承的供油量.

A numerical simulation was done on the oil pumping system of a rolling piston compressor by adopting the computational fluid dynamics （CFD）software. A physical model of the oil pumping system was established, and a general method of setting boundaries and calculating the leakage rates through the roller end significant was presented. The dynamic process of the oil pumping system was translated into static issue. In addition, the measurement of the main bearing oil flow rates was conducted to validate the rationality of the oil pumping system model. The effects of the operating condition of the compressor, the oil level height of the oil sump in the shell and the main design parameters of the oil pumping system of the compressor on the oil pumping rates were analyzed by the CFD simulation. The results show that the oil leakage rate through the roller end clearances depends largely on the operating condition of the compressor. The oil level height of the oil sump has a significant influence on the oil pumping rate. With the given operating condition and oil level height, the main hearing oil flow rate is determined by the spiral groove shape and inclination of the main bearing.