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.