烟火式气体发生器燃烧过程的数值模拟和试验研究?

建立了理论模型模拟烟火式气体发生器的燃烧过程,基于质量守恒、能量守恒、气体状态方程、气体发生剂的几何燃烧规律以及小孔气体流量规律,还考虑了与过滤网以及壳体的散热损失,获得了数值模拟的内压曲线和压力罐曲线,并与试验结果进行对比分析,证实了模拟结果的准确性。结果表明:燃速压力指数越大,发生器达到最大内压的时间越短,最大压力越高;气体发生剂厚度越小,发生器压力上升越快,最大压力越高,达到最大压力的时间越短;装药量越大,发生器压力上升得越快,最大压力越高,达到最大压力的时间越短;排气孔直径越大,最大压力越小,达到最大压力的时间越长。为烟火式气体发生器的设计提供了理论依据。

Numerical Simulation and Experimental Study on the Combustion Process for a Pyrotechnic Airbag Inflator

A theoretical model was proposed to simulate the combustion process in a pyrotechnic airbag inflator. It was based on mass, energy conservation equations, ideal gas equation of state, geometry combustion law of propellant and flowrate law of small gas vent. Heat transfer between the gas and the walls of the combustion chamber and the filter was also considered. Internal pressure curves and tank pressure curves were obtained. Numerical simulation results were compared with experiments to ensure the accuracy of the model. Results show that higher burning rate causes shorter time to reach the maximum pressure and higher maximum pressure. Thinner gas generator results in higher rising rate of pressure, shorter time reaching the maximum pressure and higher maximum pressure. The lager gas generator charge mass results it reaches the maximum pressure more quickly and higher maximum pressure while the larger nozzle area results in the maximum pres-sure more slowly and lower maximum pressure. It can provide references to design and research of the pyrotechnic airbag inflators.