为了确定高速射弹击穿飞机油箱后干舱起火的时间和燃油的泄漏流速,需要对射弹穿入燃油引起的空腔形成和崩塌过程进行分析,确定空腔的崩塌完成时间和空腔内的压力。建立了用于模拟高速射弹侵入燃油后空腔形成和崩塌的解析模型和数值模型,分析了射弹速度衰减引起的动能损失和空腔形成所需的能量之间的转换过程,定量计算了空腔内压力以及空腔崩塌完成时间和位置。研究结果表明:对于给定形状和尺寸的射弹,在空腔形成和崩塌期间,空腔内的压力和空腔崩塌完成时间变化较小,与射弹速度无关近似为常数;空腔初始崩塌的位置与撞击速度之间存在弱相关性。 In order to determine when the high-speed projectile breaks through the fuel tank of the aircraft and the time of fire in the dry cabin and the leakage rate of the fuel, the formation and collapse of the cavity caused by the penetration of the projectile into the fuel needs to be analyzed to determine the completion time of the collapse of the cavity and the time pressure. An analytical model and a numerical model for simulating cavity formation and collapse after high-velocity projectile invaded fuel were established. The conversion process between kinetic energy loss caused by projectile velocity decay and energy required for cavity formation was analyzed. Cavity pressure and cavity collapse completion time and location. The results show that for a given shape and size of projectile, the pressure in the cavity and the completion time of the cavity collapse change little during the formation and collapse of the cavity, and the projectile is almost constant regardless of the projectile velocity. The initial collapse of the cavity There is a weak correlation between the position and impact velocity.