100/200/460/700μm粒子撞击铝板的试验研究

Experimental Investigation on 100/200/460/700μm Particles Impinging Al Plate

粒子撞击壁面的反弹特性对准确预测发动机中微粒运动轨迹及撞击壁面的腐蚀情况有重要意义。为了获得颗粒的反弹特性,利用高速摄影设备对平均粒径为100、200、460、700μm的石英颗粒在10°~80°撞击角下撞击铝板进行了试验研究。试验结果表明:粒子反弹矢量具有随机性,但在大量统计数据下,其恢复系数分布基本符合高斯分布,可用均值及标准偏差描述。平均切向恢复系数随着撞击角度的增加先减小后增加。平均法向速度恢复系数是撞击角度的三次多项式函数。通过对实验数据的分析获得了4种粒径粒子撞击铝板的切/法向速度恢复系数平均值随撞击角度的变化公式,以及切/法恢复系数的标准偏差的变化规律。

Particle rebound characteristics after impinging wall are vital to predict particle trajectory and erosion in engine. To obtain particle rebound characteristics,experiments on average diameter100/200/460/700 μm particles impacting Al plate at angle range 10° - 80° were conducted with high-speed photographic equipment. Experiment results show that： though rebound behavior is stochastic,restitution coefficient accord with normal distribution by statistical analysis,which can be described by average value and standard deviation. Tangential restitution coefficient decreases firstlyand then increases as impact angle increases,while normal restitution coefficient are described by a cubic polynomial function of the impact angle. Formula of average tangential/normal restitutions coefficient as well as their standard deviations changing with impact angle were obtained by analysis of experiment data.