采用非均匀反弹特性壁面的粒子分离器研究

为了在不改变流道几何型面的基础上实现对较大粒径砂尘轨迹的有效组织,借助数值仿真技术,对一类典型无旋式惯性粒子分离器流道内两相流场展开了模拟研究。通过对典型工况下粒子分离器内砂尘轨迹的追踪和细致分析,首先获得了壁面反弹主导下的较大粒径砂尘的三类基本运动模式及其主要特征。而后以此为基础,充分利用2024铝合金、7020橡胶以及45钢3种典型壁面在反弹特性上的差异,同时结合原流道型面,完成了一种基于非均匀壁面的粒子分离器方案设计。计算表明:通过对鼓包迎风面等关键区域的壁面材质的特殊设计,可在不降低气动性能的前提下实现AC砂及C砂分离效率的显著提升,其增幅分别为6.0%和13.7%。 

Investigation of inertial particle separator withnonuniform surface materials

To efficiently improve the separation efficiency of larger particles without altering the geometry, the two phase flowfield within a typical vaneless inertial particle separator was calculated and then carefully studied by using numerical method. Three basic patterns of inertial dominated particle motion were firstly obtained through an in depth study on the particle trajectories. Then, taking advantage of the differences of three typical materials in particle rebound characteristics, namely, 2024 aluminum alloy, 7020 rubber and 45 steel alloy, a novel inertial particle separator was designed on the basis of the profound understanding of particle motion. The results show that the separation efficiency of the AC dust and C spec. sand can be thus raised by 60% and 137%, respectively.