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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。
In order to analyze the adiabatic effect and the change of temperature in the impulse engine compartment, the formula of two carbonization models for the compartment was deduced. Comparing with the actual engine test results, the error of model one was 20%, the error of model two was 6.7% The numerical simulation of the heat transfer process of the barrier layer will compare whether the heat transfer depth and temperature distribution of the barrier layer considering the influence of carbonization are compared with the theoretical calculation results without considering that the error of the calculation result of the carbonization effect is above 14.3% The error of carbonization calculation results are less than 10%. The results show that carbonization model II should be used when predicting the carbonization depth of the compartment. When calculating the temperature field distribution of the compartment, the influence of carbonization must be considered.