喉栓发动机压强响应速率影响因素分析

 为研究喉栓式固体火箭发动机喉栓运动过程中影响压强响应速率的因素,利用CFD软件建立二维模型,对压强调节过程进行仿真研究。分析了驱动系统牵引力、密封圈摩擦系数、推进剂主要性能参数以及喉栓头部几何构型对压强响应速率的影响。结果发现,驱动系统牵引力和推进剂压强指数以及喉栓头部半锥角对压强响应速率影响较大,高压下降低摩擦系数能够明显降低摩擦力提高压强响应速率,推进剂燃温对压强响应速率影响不大。

Analysis of Pressure Response Rate of Pintle Motor

In order to analyze the pressure response rate during the pintle shift movement of the pintle motor, a 2D model is build for simulations with CFD software. Influencing factors on the the pressure response characteristics are identified, such as the drag force of the drive system and the friction coefficient of the dynamic seal. It is found that the drag force of the drive system, the pressure exponent, and the semi-cone angle of the pintle head would greatly affect the pressure response rate; the decrease of the friction coefficient under a high pressure could obviously reduce the friction force and thus increase the pressure response rate; the combustion temperature of the propellant only slightly influences the pressure response rate.