【摘要】 火灾研究一直是航天器工程不可忽略的重要命题。细水雾被看作是载人航天器中有效的替代灭火剂,因此研究微重力条件下细水雾的特性是很有必要的。采用VOF方法对微重力条件下水滴碰撞高温壁面后的动力学进行了研究;分析了液滴碰撞高温壁面后运动形态和温度场的变化情况,水滴对高温壁面的冷却具有很好的效果。研究了水滴初始直径和速度对水滴铺展的影响,在一定范围内减小水滴粒径,冷却壁面的效果会增强;水滴速度大小不同时,水滴冷却壁面的方式不同。微重力条件下水滴有很好的冷却作用,为载人航天器中细水雾的使用提供了参考。更多还原

【Abstract】 With the development of manned space technology,it is more important to investigate fire safety in the spacecraft. Water mist is regarded as a promising fire-extinguishing agent in spacecraft,so it is necessary to investigate the characteristics of water mist in microgravity. A VOF model was adopted to investigate the dynamics of drop impact on a hot solid surface in microgravity. The drop deformation process and the temperature distribution were studied after the drop collision with a hot solid surface in microgravity. The water droplet could cool the hot surface effectively. The effect of droplet initial diameter and impact velocity on the drop deformation process was also investigated in microgravity. Within certain limits,the droplet with reduced diameter could enhance the hot surface cooling. The ways of surface cooling varied with the droplet initial velocity. In microgravity,the water mist has a good effect on the surface cooling,which provides valuable information for the use of water mist in spacecraft.更多还原