破片撞击充液容器引起的液体喷溅特性研究

Characteristics of liquid splashing caused by fragment impacting a liquid-filled container

为研究破片撞击充液容器引起的液体喷溅特性,开展了液压水锤及液体瞬态喷溅试验,并利用有限元软件ANSYS/LS-DYNA对该过程进行数值模拟。验证仿真模型的正确性后,研究了液体喷溅特性及破片撞击速度对其的影响。结果表明:主喷溅阶段空泡溃灭所产生的压力远大于低频脉动阶段,而在低频脉动阶段,空泡会反复膨胀与收缩,故低频脉动阶段的压力脉冲持续时间长于主喷溅阶段;空泡溃灭是液体射流产生的直接原因。喷溅流量与侵彻孔处液体压力、侵彻孔附近的液体质量有关;液体射流初始喷溅速度不仅与侵彻孔处液体压力有关,还与侵彻孔附近液体的运动速度有关。

Here,to study liquid splashing characteristics caused by fragment impacting a liquid-filled container,hydraulic water hammer and transient liquid splashing tests were conducted,and these processes were numerically simulated using the finite element software ANSYS/LS-DYNA.After verifying the correctness of the simulation model,effects of liquid splashing characteristics and fragment impacting velocity on it were studied.The results showed that the pressure generated by collapse of bubbles in main spurt stage is much larger than that in low-frequency pulsation stage,and during low-frequency pulsation stage,bubbles can repeatedly expand and contract,so pressure pulse duration in low-frequency pulsation stage is longer than that in main spurt stage;bubble collapse is the direct cause of liquid jet generation;splashing flow rate is related to liquid pressure at penetration hole and liquid mass near penetration hole;initial splashing velocity of liquid jet is not only related to liquid pressure at penetration hole,but also to moving velocity of liquid near penetration hole.