飞行过载对固体发动机内弹道的影响

Influence of acceleration on internal ballistics of solid rocket motor

对某系列发动机参加历次典型短时大过载和长时间中小过载工况飞行试验中遥测压强数据进行了汇总分析,结合发动机飞行试验后喷管喉衬解剖数据,总结了发动机在各种飞行过载工况下内弹道变化规律。结果表明,在短时大过载条件下,发动机压强均有一定程度降低,下降幅值约0.2~0.4 MPa;在长时间中小过载条件下,因推进剂种类不同,喷管喉衬烧蚀和发动机压强变化规律不同;过载对推进剂燃速影响不大。

The comprehensive analysis of flight test telemetry pressure data of certain series solid rocket motors under missile＇s all previous typical transverse acceleration conditions of short time large acceleration and long-time middle and small acceleration was completed.According to the nozzle throat insert dissection data after solid rocket motor flight test,the internal ballistics changing regularity was summarized.The results show that there is a pressure drop of 0.2 ～ 0.4 MPa under short tome large acceleration. The pressure change and nozzle throat insert ablation regularity of solid rocket motor with different propellants is different under longtime middle and small flight acceleration.The effect of acceleration on burning rate of solid propellant is minor.