基于视加速度的固体火箭发动机飞行比冲估算

建立了基于遥测视加速度的推力及比冲计算模型,模型中考虑了附加质量对发动机推力的影响,对固体火箭发动机飞行试验推力及比冲进行了计算,并与利用标准内弹道预示程序重新预示的发动机推力及比冲进行了对比,两种方法计算结果一致。算例表明,利用飞行试验遥测视加速度计算发动机推力及比冲的计算模型正确,有关参数的选取和处理方法可行;该方法可准确再现发动机飞行过程的实时推力和比冲;可有效用于发动机飞行试验结果的快速分析与评估。

Calculation of specific impulse of solid rocket motor based on visual acceleration

Based on telemetry visual acceleration,the calculation models of thrust and specific impulse were established,and the effect of the additional mass on the thrust was taken into account.The thrust and specific impulse of solid rocket motor during flight process were calculated by using the model.The calculated results were compared with re-predicted results by standard internal ballistic program.Two kinds of calculation results are consistent.The calculation examples show that the model is available and practicable,and the method can be used for correctly reconstructing real-time thrust and specific impulse,which is applicable for rapid analysis and assessment of solid rocket motor flight test results.