关键词: 固体火箭发动机;液体燃料;燃料喷射;熄火;预测

Abstract: Based on the experimental studies,a theoretical model for liquid quench of solid rocket motor has been proposed. In the model, the coupling effects of internal ballistics of rocket motor,transient burning of solid pro-pellant, liquid drop evaporation and boiling heat transfer by liquid jet impinged on the burning surface are considered in detail. With application of the model, the liquid quench process of solid rocket motor (the critical injection pressure drop and the liquid quantity required for reliable extin-ction) is predicted theoretically.It is found from this theoretical study that there is a critical value of injection pressure drop required, for the liquid quench of rocket motor. Only when the injection pressure drop is greater than the critical value, can the extinction be achieved. The critical injection pressure drop for certain kind of prbpellant increases with increased piopellant energy. As the injection pressure drop increases, the liquid quantity required for reliable extinction decreases and the extinction speed increases, but their variation rates decreases. There is not a minimum liquid quantity value for extinction. Therefore,the parameteis,injection pressure drop, and liquid quantity to be injected, must be selected appropriately in the engineering design to obtain the best characteristics of the stop/ restart solid rocket motor with application of liquid injection technique. The theoretical results agrees well with the experimental ones.

Key words: Solid rocket motor;Liquid fuel;Fuel spray;Flameout;Predction