光电干扰箔片抛撒与扩散试验研究

采用两种状态箔片(直径49.5mm,厚0.15mm,1g;直径47mm,厚0.05mm,0.5g)研究了光电干扰箔片抛撒与云团扩散问题。设计了试验模型、试验方案并提出网格图层的数字图像处理方法。通过抛撒各阶段云团发展状态的高速数字图像记录和参数统计,清晰地反映了装填密集度较高情况下的箔片出舱、分离、扩散动态过程。提取单个箔片运动轨迹,显示出箔片的速度衰减与沉降特性。对散布云团结构进行统计分析,结果表明大数量箔片抛撒在气流作用下由尾部开始分离扩散,并出现集束段断层,各集束段时序扩散,形成锥形云团,首尾融合。在此基础上建立了锥体云团膨胀模型,有效描述出大数量箔片云团膨胀过程及其发展形态。

Dispersing Experiment for Separation and Dispersion of Multi-plates

For the issue of foils′ separation and dispersion, a dispersing experiment was carried out by using two materials (diameter of 49.5 mm, thickness of 0.15 mm, 1 g; diameter of 47 mm, thickness of 0.05 mm, 0.5 g). The experimental model, testing scheme were established and gridding method about digital picture was introduced. The high-speed digital photos were analyzed combined with statistical parameters. The dynamic process was displayed fairly consisting of cast, separation and dispersion with a mass of foils. The trajectory with velocity decrease and descent movement of plate was obtained. The dynamic characteristics of dispersing cloud were statistically analyzed. The results reveal the mass of foils separated from the tail of cluster due to the aerodynamic. The cluster separates into several parts which disperse scheduling. Each part shows a cone shape based on which a cone-shaped cloud dispersing model was established. The model described the expansion and movement of cloud effectively.