摘要
使用激光相位多普勒粒子测速系统对激波抛撒水膜形成的云团进行了观测,得到激波抛撒水膜形成的云雾中液滴速率和尺寸参数。结果表明:不同厚度水膜在同等强度激波的作用下抛撒,破碎产生的液滴轴向速率和尺寸以及形成云团的高度都随水膜厚度的增加呈"W"形变化。不同厚度水膜其破碎液滴轴向运动速率存在显著差异,而径向运动速率差距不大。结果说明,在激波作用初期,激波驱动力起着关键作用,随着抛撒距离的增加,液滴的重力及在气流中所受摩擦阻力的影响越大。液膜厚度越小,透射激波越强,液膜被抛撒的范围越大。形成云团的直径随着液滴的径向速率增加而变大。
Cloud of liquid film induced by shock wave was observed and investigated by phase Doppler particle analyzer system, and related parameters of diameter and velocities were ob- tained. The results indicate that liquid film of various thickness induced by the shock wave of the same intensity produced water particles with strikingly different vertical velocities and slightly different horizontal velocities. The size of the cloud, the vertical velocity and size of the droplets show an inverted ＂W＂ shape. Through a sorting out and analysis of the test results, the aerody namic force is the main force in the initial time period after the reaction of shock wave while the weight of droplet and the frictional resistance in the air play a key role with the increase of disper- sion distance. Thinner water film means stronger transmitted wave, the dispersion scope becomes wider. The diameter of cloud becomes bigger because of larger horizontal velocity.
出处
《实验流体力学》
CAS
CSCD
北大核心
2013年第2期50-55,共6页
Journal of Experiments in Fluid Mechanics
基金
国家自然科学基金委员会和中国工程物理研究院联合基金(10676120)资助
关键词
PDPA
激波
水膜
液滴速率
液滴尺寸
PDPA
shock wave
water film
drop velocity
drop size distribution
