二次燃烧对燃气弹射初容室载荷影响数值研究

Numerical Simulation of Secondary-Combustion Influence on Gas-Ejection Load in Initial Chamber

建立了初容室燃气弹射三维数值模型,采用两步CO-H2-air化学反应过程模拟初容室内的二次燃烧过程,运用动态分层动网格方法模拟初容室尾罩的运动,对燃气在初容室的流场演化过程进行了数值模拟。结果表明:初容室内二次燃烧的气体的扩散速度比多组分气体流场快;与多组分气体工况相比,二次燃烧过程增加了初容室内的温度峰值,降低了初容室压力峰值;通过与实验曲线对比,二次燃烧的工况获得温度和压力载荷与实验更接近。研究结果可为燃气弹射内弹道设计提供理论基础。

Three-dimensional gas-ejection computational model was established,the two-step CO-H2-air chemical reaction was adopted to simulate the secondary combustion and dynamic mesh method was used to simulate the gas ejection tailor’s moving.The flow jet fluid process was simulated.Results show that,the gas diffusion velocity of secondary combustion is faster than multicomponent case in initial chamber.The temperature peak in secondary combustion case is higher than multicomponent and the pressure peak is lower.Compared with the experimental curves,the load plots of secondary combustion case are more close to the experimental results.The results can provide theoretic basis for the internal trajectory design.