一款发动机油气分离器的结构参数优化

Structural Parameters Optimization of an Engine Oil-Gas Separator

为提高一款发动机用多孔过滤型油气分离器的分离效率,采用计算流体动力学(Computational Fluid Dynamics,CFD)数值计算方法对原模型件内气液两相的流动特性与分离特性进行分析。结果表明,该模型件内的最大速度梯度和最大压力梯度所在区域均在多孔板上通孔和泡沫型多孔介质滤材的流通结合部。采用正交试验法对该油气分离器的多孔板与泡沫型多孔介质滤材的关键结构参数进行优化研究,获得了主要结构参数对气液两相的流动和分离效率指标影响的权重顺序,确定了该多孔过滤型油气分离器的最优结构组合,并通过试验进一步验证了该最优结构高效油气分离器的性能。

In order to improve the separation efficiency of a porous-filter oil-gas separator for an engine, the flow and separation characteristics of the gas-liquid two-phase flow in the original separator were analyzed by computational fluid dynamics （CFD）. The results show that the maximum velocity gradient and the maximum pressure gradient are both generated at the flow connections of through holes of the perforated plate and the foam porous media. With the orthogonal experimental method, the key structural parameters on the perfbrated plate and the foam porous media of the oil-gas separator were optimized. Therefore the weight order of the influence of the main structural parameters on the gas-liquid two-phase flow and separation efficiency index is obtained. The optimal structure of the porous-filter oil-gas separator is determined. And finally, the simulation results of the optimal structure are experimentally validated.