基于气体发生剂的子弹药气囊抛撒数值模拟研究

For the numerical simulation of submunition dispenser with gas generant and airbag, a model of airbag dispersing is built by using software LS-DYNA and solid-liquid coupling ALE algorithm, in which the mass flow rate of gas is considered as the input parameter of numerical simulation. On the basis of interior ballistic theory and closed bomb vessel experiment, the nominal combustion rate equation of gas generant and the mass flow rate equation are presented. The typical structure of submunition dispenser fileed with different amount of gas generant is simulated to obtain the velocity of submunition dispensed from airbag and the change of overload peak with the amount of gas generant. The simulated results are in agreement with the test results. The results show that the proposed method could be used to predict the velocity and acceleration of submunitions in practical tests.