湍流弥散对轴心通风器油气分离过程的影响

Effect of Turbulent Dispersion on Oil/Gas Separation Process in Axial Ventilator

轴心通风器对航空发动机性能的提升有着重要意义,但其结构和内部流动均比较复杂,很难进行详细的试验研究。应用DPM模型对航空发动机轴心通风器内气液两相流流场进行了数值模拟。通过对比不同工况以及数学模型计算所得到的分离效率,结合试验测得数据,对轴心通风器油气分离机理和湍流的影响进行研究。结果表明:除了离心力和惯性分离对分离效果有重要影响外,湍流弥散对提高分离效率也有非常重要的作用,合理地提高湍流强度可以减少滑油消耗量。

The axial ventilator had an important significance in promoting the performance of the aeroengine, however, the research on its complicated structure and inner flow was hardly experimental studied in detail. The oil / gas two-phase flow field in the axial ventilator for aeroengine was numerically simulated by the DPM model. The oil/ gas separation mechanism of the axial ventilator and turbulence effect were investigated by the experimental data and the separation efficiencies which were calculated by the mathematical model in different conditions. The results indicate that not the centrifugal force and inertia separation but the turbulent dispersion have an important significance in promoting separation efficiency, so the oil consumption can be reduced by increasing the turbulence intensity reasonably.