固体火箭发动机性能天地差异性探讨

Discussion on ground-to-flight performance difference of SRM

在利用飞行遥测参数反算固体火箭发动机性能过程中,存在诸多的因素影响发动机性能计算结果。对末级发动机飞行遥测性能反算的两种方法及影响因素进行了分析,对发动机性能天地差异性进行了探讨,结合某末级发动机遥测数据对各因素的影响程度进行了定量分析,重点关注了具有不同变化规律的结构质量因素。结果表明,末级发动机反算性能对弹体起飞质量很敏感,发动机附加质量、沉积质量的影响约为起飞质量的1/2;对该发动机而言,流量变化和附加质量的影响程度分别为0.15%和0.36%以内;而发动机过载条件下的沉积问题还需更深入的研究。

Several factors affect the the solid rocket motor（SRM） flight performance recalculation,when evaluating its perform- ance from remote measured data during flights. Two recalculation methods and the factors were studied here.The sensitivity analysis was performed by using the SRM flight data to determine the contribution of the factors, in which the variant of weight was fully con- sidered.The results show that take-off weight of the missile body has significant influence on the performance, while the additional weight and the deposition have about a half influence as take-off weight. For this motor, flow rate and additional weight have an effect on the SRM performance within 0.15% and 0.36% respectively.The influence of deposition still requires a deep research.