基于CFD方法的电驱系统管内流体流动分析研究

Fluid Flow Analysis in Injection Pipe of Electric Drive System Based on CFD Method

以电驱系统内喷油管为研究对象,基于计算流体力学方法,对喷油管进行多工况下内部流动仿真,得到了不同工况下各喷口的喷射流量以及流速,与试验结果进行了对比,并对电驱系统内常见的90℃工况下的内部流动进行分析。结果表明,喷油管的喷射能力受油温影响很大;随着管径的缩小,支管内油液流速逐渐增加;各支管出口处流量与流速大致相同,可以实现均匀的润滑冷却;在主管远离进口的一端,中间截面上的流速趋近于静止状态;支管的插入深度对管内流动产生较大影响,在后续优化中需要重点关注。

jBased on the computational fluid dynamics method,the internal flow of the fuel injection pipe in an electric drive system was simulated under multiple operating conditions.The flow rates and velocities of each nozzle were obtained under different operating conditions,the results are compared with the experimental results,and the internal flow of the electric drive system under the common working condition of 9o C is analyzed.It shows that the fuel injection ability is greatly affected by the oil temperature,the oil flow rate in the branch pipe increases with the reduction of the pipe diameter,the flow rate and the flow rate at the outlet of each branch pipe are approximately the same,and uniform lubrication and cooling can be achieved at the end of the main pipe far from the inlet,there is a dead water area,and the insertion depth of the branch pipe has a great effect on the flow in the pipe,which needs to be paid more attention in the following optimization.