基于多孔介质模型的点火火焰在发射药颗粒床中的传播特性

The Propagation Characteristics of Ignition Flame in Propellant Particle Bed Based on Porous Media Model

为了研究中心传火管点传火结构下点火药燃烧后产生的火焰在发射药药粒填充床中的传播特性,使用多孔介质模型模拟发射药药室颗粒填充床,并采用N-S方程模型对点火药燃烧产生的高温高速气体在发射药颗粒床中的流动传播过程进行数值仿真计算,并以温度场的等温面传播等效于火焰阵面传播,仿真数据与试验数据进行对比。结果表明,在密实装药床下,点火火焰传播过程中,以等温面等效于火焰阵面,火焰传播速度的仿真计算值为91 m·s^-1,与试验测得96 m·s^-1较为接近;仿真得到的高温火焰气体传播的温度场云图与试验拍摄的火焰传播图像具有较好的一致性;采用多孔介质模型计算所得的膛内3处测压孔的压力数据与试验测得的压力数据吻合度较高。

In order to study the propagation characteristics of the flame generated by ignition charge combustion in the propellant pellet packed bed under the ignition transmission structure of the central fire tube,a porous media model was used to simulate the gun propellant pellet packed bed in the propellant chamber,the flow and propagation process of high temperature and high speed gas generated by the combustion of ignition charge in the gun propellant pellet bed is simulated by using the N-S equation,the isothermal surface propagation of the temperature field is equivalent to the flame front propagation,and the simulation results were compared with those of experimental data.The results show that in the case of a dense charge bed of propellant,the isothermal surface is equivalent to the flame front in the process of ignition flame propagation,and the simulation value of flame propagation velocity is 91 m·s-1,which is close to 96 m·s-1 obtained by experiment;the simulated cloud images of temperature field of high temperature flame gas propagation are consistent with those of the experimental flame propagation images;the pressure data at the three pressure measuring holes in the chamber calculated by the porous media model are in good agreement with those of experimental data.