航空发动机进气及叶栅通道内砂粒动力学特性分析

为提高发动机的吞砂、防砂能力，需要了解砂粒在发动机中运动规律及对发动机性能的影响。采用欧拉-拉格朗日法对E3发动机整流罩、风扇和增压级进行了砂粒与气流的耦合作用分析计算，加入颗粒碰撞模型和侵蚀模型。仿真分析结果表明:砂粒运动轨迹和侵蚀区域符合发动机使用规律。砂粒进入发动机与风扇叶片压力面发生碰撞，砂粒发生碰撞后大部分进入了外涵流道。砂粒碰撞位置主要集中在风扇叶片压力面处，风扇对颗粒运动轨迹的影响最显著，碰撞后的颗粒有明显的径向运动趋势，叶顶区域的颗粒富集程度较高。整流罩、风扇叶片压力面及外机匣壁面都发生较为严重的砂粒侵蚀现象，而增压级叶片砂粒侵蚀现象不明显。 

Analysis of dynamic characteristics of sand particles in air intake and compressor cascade of aero-engine

In order to improve the sand swallowing and sand control capabilities of the aeroengine, it is necessary to understand the law of sand movement in the engine and its impact on engine performance. The Euler-Lagrangian method was used to analyze and calculate the coupling effect of sand particles and airflow on the E3 engine fairing,fan and supercharger stage,and the particle collision model and erosion model were added. The simulation analysis results showed that the sand movement trajectory and erosion area conformed to the engine usage law. The sand particles entered the engine and collided with the pressure surface of the fan blades, and most of the sand particles entered the outer culvert flow channel after the collision. The collision position of sand particles was mainly concentrated at the pressure surface of the fan blades. The fan had the most significant influence on the particle movement trajectory. The particles after collision had an obvious radial movement trend, and the particle concentration in the tip area was relatively high. The fairing,the pressure surface of the fan blades and the wall of the outer casing all had serious sand erosion,while the sand erosion of the booster stage blades was not obvious.