点火器出口参数对装药表面压力振荡的影响

Influence of exit parameters of igniter on pressure vibration at grain surface

合理的设计点火器的出口参数对固体火箭发动机成功点火具有很重要的意义.采用数值模拟的方法对某发动机模型点火初期的受限流进行了计算,对流场结构进行了分析,并比较了不同点火器出口半径与主发动机通道半径之比及点火器出口压强对装药表面冲击的影响.计算结果表明:装药表面压强峰值随点火器出口半径和出口压力的增大而增大,而出口半径的影响更大一些;在装药表面,最大压强值随点火器出口半径呈近似线性变化趋势.这对合理的设计点火发动机有一定的指导意义.

An igniter with reasonable exit parameters is very important to a solid rocket motor＇s （SRM） successful ignition. The limited flow in the initial ignition process was numerically simulated for some SRM models. The authors analyzed the flow field structure and compared the influence on the grain＇s surface of different ratios of the igniter＇s exit radius to the radius of the main motor＇s passages as well as the influence of the igniter＇s exit pressure. The pressure distribution on the grain＇s surface increased with rising radius or pressure at the igniter exit. Pressure increases have more impact. Near maximum, pressure showed a trend of linear changes at the grain surface. This should help improve the design of igniters for SRMs.