脉冲发动机中隔层传热炭化模型

Charring Model of Heat Transfer for Pulse Separation Device of Pulse Motor

为分析脉冲发动机中隔层的绝热效果及温度变化情况,推导了隔层两种炭化模型的计算公式,对比实际发动机试车结果,模型一误差为20%,模型二误差为6.7%,炭化模型二具有较好的精度;数值模拟了隔层的热传导过程,将是否考虑炭化影响的隔层传热深度及温度分布与理论计算结果进行对比,未考虑炭化影响计算结果的误差在14.3%以上,考虑炭化影响计算结果的误差均小于10%。研究结果表明,预估隔层炭化深度时,应该运用炭化模型二;计算隔层的温度场分布时,必须考虑炭化影响。

To investigate the heat transfer for pulse separation device （PSD）of pulse solid rocket motor, formulae of two charring models were developed and the results were compared with the actual engine test results. Charring model 1 has a 20% error,and charring model 2 has a 6.7% error,charring model 2 has a better accuracy. The heat conduction for PSD is compu- ted and the results were compared for the depth and the temperature distribution of the PSD. The results does not consider charring has a 14. 3% error,and the results consider charring has a 10% error. The results show that the charring model 2 gives a preferable explanation, and the simulated results agree well with the theoretical value when the charring is considered. The conclusions are helpful for designing pulse solid rocket motor configuration.