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首页> 外文期刊>Journal of the American Helicopter Society >A Numerical Study of Sand Particle Distribution, Density, and Shape Effects on the Scavenge Efficiency of Engine Inlet Particle Separator Systems
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A Numerical Study of Sand Particle Distribution, Density, and Shape Effects on the Scavenge Efficiency of Engine Inlet Particle Separator Systems

机译：沙粒分布，密度和形状对发动机进气口颗粒分离器系统清除效率影响的数值研究

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摘要

Sand size and shape factor, engine inlet angle to the approaching flow, splitter position, inlet wall rebound characteristics, inlet and scavenge vanes, and struts have pronounced effects on the scavenge efficiency. A numerical study is conducted on the effects of particle shape, density, and distribution at the engine inlet on the scavenge efficiency. Three-dimensional Navier-Stokes equations for air and the conservation equations in the Lagrangian framework for particles were solved simultaneously. Sand distribution, density, and shape factor for four engine inlet geometries were varied, and results were compared. Nonuniform distributions with small (large) particles concentrated at the inlet inner radius have the highest (lowest) scavenge efficiency. For random distributions, scavenge efficiency increases with inlet tilt angle, particularly for angles above 10°. Particles smaller than 20 μm are the most problematic as they follow the flowpath to the engine core. Sand density and size have similar influences on the scavenge efficiency, i.e., higher (lower) density particles behave like larger (smaller) particles. However, this effect is noticeable only for particle sizes less than 10 μm. Variations in particle shape factor are only noticeable for particle sizes less than 20 μm. Scavenge efficiencies for particle sizes less than 5 μm are influenced by both increasing and decreasing shape factors, whereas scavenge efficiency for 10-μm particles is influenced only by shape factors below that for spherical particles.
机译：沙粒的大小和形状因数，发动机进气口对接近气流的角度，分流器位置，进气口壁回弹特性，进气口和扫气叶片以及支柱对扫气效率都有明显的影响。对发动机入口处的颗粒形状，密度和分布对清除效率的影响进行了数值研究。同时求解了三维空气Navier-Stokes方程和拉格朗日框架中的守恒方程。改变了四种发动机进气口几何结构的沙分布，密度和形状因子，并对结果进行了比较。小（大）颗粒集中在入口内半径处的不均匀分布具有最高（最低）清除效率。对于随机分布，清除效率随入口倾斜角而增加，特别是对于10°以上的角度。小于20μm的颗粒是最成问题的，因为它们遵循流向发动机核心的流路。沙的密度和大小对清除效率有类似的影响，即，较高（较低）密度的颗粒的行为类似于较大（较小）的颗粒。但是，仅对于小于10μm的颗粒，此效果才明显。仅当粒径小于20μm时，颗粒形状因子的变化才明显。小于5μm的颗粒的清除效率受形状因子的增加和减少的影响，而10μm颗粒的清除效率仅受球形颗粒以下的形状因子的影响。

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