粒子撞击树脂涂层/铝/合金钢板的反弹特性试验

为了精准探索直升机进气粒子分离器性能，研究了砂粒撞击不同壁面材料的反弹特性。采用粒径为600～800μm的砂粒撞击树脂涂层/铝/合金钢板开展试验探究。设计的试验系统可实现单颗粒子撞击板面。撞击角度在10°～80°范围内变化，撞击前后的速度矢量由高速摄影仪拍摄获得。结果表明:撞击树脂涂层板时，法向恢复系数要高于撞击铝板及合金钢板的法向恢复系数。切向恢复系数主要受摩擦力的影响。同时由于阴影效应的影响，在接近切向/法向撞击时，切向/法向恢复系数分别出现大于1的现象。不同扫气比（SCR）下，应用砂粒撞击铝板的切向/法向恢复系数对粒子分离器进行数值模拟的分离效率与已有的分离器试验结果最接近。 

Experiment of particle rebound characteristics for impingement on resin coated/Al/alloy steel plate

In order to accurately explore the helicopter performance of inlet particle separator, the rebound characteristics of sand impinging different material surfaces were studied. The experiment of particle diameters of 600－800μm sands impacting resin coated/Al/alloy steel plate was conducted. A self-designed experimental system can realize the single particle impact plate. The velocity vectors before and after impact were measured with the high speed camera, within a range of impact angle from 10° to 80°. Results showed that the normal restitution coefficient with sand impinging resin coated plate was higher than that with sand impinging Al/alloy steel plate, while the tangential restitution coefficient was mainly affected by the friction. At the same time, due to the influence of the shadow effect, the normal restitution coefficient or tangential restitution coefficient was more than 1 respectively when the impact angle was close to tangential or normal impact direction. At different scavenging ratio(SCR), the separation efficiency of simulation using the restitution coefficient of sand impinging Al plate was closest to the result of recent experiment on inlet particle separator.