摘要：为设计出更高可靠性、更高精度的冲击仪,通过耦合计算流体力学和颗粒动力学,比较分析不同结构参数对颗粒拦截效率的影响,探究单级低压冲击仪的流场和颗粒在流场中的运动规律。结果表明,当冲击喷嘴直径为原始喷嘴直径的一半时,可得到理想形状收集曲线,分辨率最高,可达1.92;喷嘴至收集平板的距离为0.5 mm时,低压冲击仪的拦截效果最好,分辨率为6.8。

关键词：低压冲击仪；颗粒粒度分布；拦截收集曲线；最佳距离

Abstract: In order to design a more reliable and accurate impactor，hydrodynamics and particle dynamics were calculated by coupling，the influence of different structural parameters on the efficiency of particle interception were compared and analyzed． The flow field of single-stage low-pressure impactors and the movement law of particles in the flow field were studied． The results show that when the diameter of the impact nozzle is half of the original nozzle diameter，the ideal shape collection curve can be obtained，with the highest resolution of 1．92． When the distance between the nozzle and the collecting plate is 0．5 mm，the interception effect of the low-pressure impactor is the best，and the resolution is 6．8． 

Keywords: low-pressure impactor; particle size distribution; interception and collection curve; optimal distance