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为准确模拟聚乙烯在固体燃料冲压发动机中的燃烧状态,估算了乙烯-空气两步反应中,相关组分的粘性、导热系数随温度的变化,并进行多项式拟合;同时使用UDF进行质量、动量、能量添加。数值计算的结果表明:燃面退移速率的计算误差不超过11.3%,其变化规律与已有实验相同;补燃室温度的误差不大于5.2%;补燃室温度随来流空气质量流率的增大而减小;高来流空气总温或低来流空气质量流率的工况下,燃料充分燃烧所需的补燃室更长;几何相似,其它条件相同时,小尺寸发动机内流场传向燃料表面的热流密度更大,燃面退移速率更高。
In order to accurately simulate the combustion state of polyethylene in the solid fuel ramjet engine, the viscosities and thermal conductivity of the relevant components in the ethylene-air two-step reaction were estimated and the polynomial fitting was performed. At the same time, the quality, Momentum, energy added. The results of numerical calculation show that the calculation error of the surface burning rate does not exceed 11.3%, and its variation is the same as that of the existing experiments. The error of the combustion chamber temperature is not more than 5.2% Of the total flow of air temperature or low flow of air mass flow conditions, the fuel required for combustion sufficient combustion chamber longer; similar geometry, the other conditions are the same, the small size of the engine The heat flux of the flow field to the fuel surface is higher, and the burning rate is higher.