针栓式变推力固体火箭发动机中针栓所受载荷

Force on the pintle of pintle variable thrust solid rocket motor

为研究不同因素对针栓式变推力固体火箭发动机内流场流动特性、发动机性能参数及针栓所受载荷的影响,探究其控制性能,采用数值仿真的方法,对不同针栓型面及针栓尾部凹槽设计下的喷管内流场进行计算研究.结果表明:针栓式变推力固体火箭发动机的推力调节范围很大,针栓受力变化也大;针栓型面的改变对针栓载荷无显著影响,最大载荷下降28%;针栓尾部凹槽的设计可以在较大程度上平衡针栓载荷,最大载荷下降56%;针栓阀体导流槽的设计对于针栓所受载荷的降低有显著作用,最大载荷下降91%,大大增强了针栓式变推力固体火箭发动机的控制性能.

The influences of different factors on the flow characteristics of the internal flow field,the motor performance parameters and the force on the pintle were studied,and the control performance of the pintle motor was explored.Based on the method of numerical simulation,the flow field in nozzle under different pintle profiles and pintle tail groove designs was calculated and studied.The results showed that the thrust adjustment range of pintle variable thrust solid rocket motor was large,and the force variation of pintle was also large.The change of pintle profile had no significant effect on pintle load,and the maximum load decreased 28%.The design of the tail groove of the pintle can balance the pintle load to a large extent,and the maximum load was reduced by 56%.The design of the guide groove of the valve body of the pintle had a significant effect on reducing the force on the pintle,and the maximum load decreased 91%,which greatly enhanced the control performance of the pintle variable thrust solid rocket motor.