雨滴对降落伞织物垂直冲击的实验研究

为了研究多雨环境对降落伞开伞的影响机理,设计了液滴对降落伞织物垂直冲击的实验装置。依据降雨谱选择有代表性大小的液滴,由雨滴和降落伞的稳降速度确定了液滴的冲击速度范围在0.77~2.42 m/s之间,利用高速摄像机记录液滴对织物垂直冲击的动态过程,分析了液滴在织物表面的铺展特性。实验结果表明:当液滴冲击速度提高150%和214%时,反映液滴铺展特性的平均最大铺展因子分别增大64%和68%。此外,提高织物的预紧张力可以有效减弱液滴对织物冲击所造成的振动影响。

Experimental study of the vertical impact of raindrop on parachute fabrics

In order to study the influence of rainy environment on parachute opening, an experimental device for vertical impact of droplets on parachute fabric was designed. Representative size droplet was selected according to rainfall spectram and the dynamic process of the droplet vertical impact on fabric was recorded by high-speed camera, thus the spreading characteristic of droplets on the fabric surface was analyzed. Experimental results show that the average spreading factor of droplet increases by 64% and 68% respectively when the droplet velocity increases by 150% and 214%. In addition, increasing the pretension of the fabric will effectively reduce the vibration which was caused by the impact of droplet on the fabric.