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为了建立一种适用于冲压发动机的不依赖于实验数据的、可以实现多区域跨声速区稳定求解的一维流分析计算模型,通过对目前已有的各种冲压发动机一维流分析模型进行分类、总结和对比分析表明,依靠实验静压数据的一维模型难以满足实际性能计算的需要,去掉等压段假设并用摩擦项替代芯流经验公式是可行的,多区域跨声速区求解可以通过变量替换法实现。在此基础上,建立了一种改进的适用于冲压发动机的一维流快速计算模型,该算法不依赖于实验数据,可以实现多区域的跨声速区稳定求解。将算例结果与实验数据相比,总压误差在5.2%以内;与某模型的结果相比,总温相差1.3%,马赫数相差2.7%。新模型的结果在马赫数、静压、总压、总温等参数的计算上较准确,改进方法可方便快速地用于冲压发动机的性能计算。
In order to establish a one-dimensional flow analysis model that can be applied to the ramjet engine independently and depend on the experimental data, the multi-zone cross-sonic zone can be stably solved. By classifying the existing one-dimensional flow ramjet model The conclusion and comparative analysis show that the one-dimensional model relying on experimental hydrostatic data can not meet the need of actual performance calculation. It is feasible to remove the isobaric hypothesis and replace the core flow empirical formula with friction term. Multi-region transonic zone can be solved by variable Substitution method to achieve. On this basis, an improved one-dimensional fast calculation model for ramjet engine is established, which does not depend on the experimental data and can be used to solve the multi-zone transonic zone steadily. Compared with the experimental data, the total pressure error is less than 5.2%. Compared with the result of a model, the total temperature difference is 1.3% and the Mach number is 2.7%. The results of the new model are more accurate in Mach number, static pressure, total pressure, total temperature and other parameters, and the improved method can be used to calculate the performance of ramjet engine easily and quickly.