典型毁伤元对油箱等效靶的引燃阈值速度研究

Research on Ignition Threshold Velocity of the Damage Element to Fuel Tank

为获得典型毁伤元对半油和满油油箱等效靶的引燃阈值速度,开展典型破片引燃油箱等效靶的实验和数值模拟研究,获得了油箱等效靶的引燃判据。采用数值模拟方法开展了A g长方体破片以0°攻角和90°攻角、3 g立方体破片、8 g立方体破片在不同着角时冲击油箱等效靶过程仿真,获得了破片在不同着角时对半油和满油油箱等效靶的引燃阈值速度,建立了典型破片对油箱等效靶的引燃阈值速度计算式。结果表明,半油和满油油箱等效靶的最大冲击压力分别为1.56 GPa和1.63 GPa,且燃油蒸汽-空气可燃性混合气体温度分别为609 K和645 K时,油箱等效靶可被引燃;随着着角减小,破片质量增大,油箱等效靶引燃速度阈值降低,而半油油箱等效靶的引燃阈值速度较满油状态的更低。

In order to obtain the ignition threshold velocity of the typical damage element to the half-fuel and full fuel tank,experimental and numerical simulation research of the typical fragment pilot fuel tank was carried out,and the ignition criterion of the fuel tank was obtained.The numerical simulation was performed to simulate the process of A g cuboid fragments at 0°and 90°angles,3 g cube fragments and 8 g cube fragments at different angles impacting the fuel tank.The ignition threshold velocity of fragment for half-fuel and full fuel tank was obtained,and the calculation formula of ignition threshold velocity of typical fragment to fuel tank was established.The results show that the maximum impact pressure of the half-fuel and full fuel tanks are 1.56 GPa and 1.63 GPa,respectively,and the fuel vapor-air combustible gas temperature is 609 K and 645 K,respectively,the fuel tank could be ignited.The ignition velocity threshold of the fuel tank decreases as the impact angle decreases and the fragment mass increases.The ignition threshold velocity of the half fuel tank is lower than that of the full fuel tank.