关键词: 固体推进剂火箭发动机;推进剂质量比;比冲;推进剂药柱

Abstract: The relation between motor specific impulse and average operating pressure is. calculated by using the theoretic calculating method of motor specific impulse. The relation between propellant-to-motor mass ratio and maximum operating pressure-to-average operating pressure ratio and grain volumetric loading fraction is inferred from the formula of propellant-to-motor mass ratio’ It is shown by predication and tests that motor specific impulse rises with increase of average operating pressure and the propellant-to-motor mass ratio rises with the increase of grain volumetric loading fraction and the decrease of maximum pressure-to-average pressure ratio.

Key words: Solid propellant rocket engine;Propellant mass ratio;Specific impulse;Propellant grain