高速破片撞击飞机油箱的数值模拟研究

摘要

In order to evaluate the damage of fuel tanks for aircrafts by hydrodynamic ram (HRAM) event, the damage of characteristics of a water-filled tank facing a fragment impacting are calculated by numerical simulation method of given velocity fragment and the Arbitrary Lagrangian-Eulerian (ALE) technique, the results of tank wall damage are compared with different velocities of fragments and different water filling ratios. The research results show: the damage impacting a full-filed tank is more serious than impacting an empty one, the entry and exit walls relative to the impacted shell have the most serious damage. With the fragment velocity increasing, the deformations on the entry and exit wall are also increasing. The deformation of part-filled tank wall is much smaller than full-filled tank wall. The deformation on 75%filled tank and 85%filled tank is relatively close.%为研究飞机油箱在水锤作用下的破坏效应，运用数值计算方法对高速破片撞击充水箱体的破坏响应进行研究。采用赋予破片速度和ALE建模的方法数值模拟高速破片撞击充水箱体的破坏响应，并对不同破片速度和不同充水比下箱体的变形进行比较分析。计算结果表明：破片撞击充水箱体时的破坏效应较空箱体要严重得多，箱体前后壁的穿孔处周围是发生破坏最严重的区域；箱体前后壁的变形量随破片速度的增加而增加；部分充水箱体的变形明显小于完全充水的情况，但对于充水75%和85%的箱体变形差距不大。