液体喷射作用下固体推进剂熄火研究

A STUDY OF COMBUSTION EXTINGUISHMENT OF SOLID PROPELLANTS BY LIQUID INJECTION

This paper proposes a physical model for the liquid quench of solid propel-lant and presents the results of an experimental study of extinguishment of solid propellant motor by liquid injection. The effects of several variables, such as propellant energy characteristics, injection pressure drop, chamber pressure and additive in liquid,on the liquid quantity requirement for the extinction of propellant have been studied. The results indicate that all of these factors exert an influence on the liquid quench characteristics. The propellant energy is a predominant factor for the liquid quantity requirement (LQR), i.e., LQR increases with increasing propellant energy. As the injection pressure drop increases, LQR decreases and the depressurization rate increases. The relationship between LQR and the chamber pressure varies with the burning rate pressure exponent (n), i.e., when n>0, LQR inceases with increasing chamber pressure; conversly, n<0, LQR decreases. The liquid properties exert an important effect on LQR . The additive selected appropriately in liquid significately reduces LQR.