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为了分析宽马赫数飞行条件下超声速燃烧室再生冷却性能以及考虑燃料高温裂解效应对冷却的影响,发展了具有一定通用性的超声速燃烧室再生冷却系统气-固-液传热分析模型,对燃烧室内流、冷却剂流动以及冷却结构进行了气-固-液传热耦合计算。燃烧室内流计算模型无需实验测量的静压数据以及总温/释热分布假设,通过直接求解质量、动量、能量守恒微分方程并结合燃料混合及燃烧模型来获得内流参数分布。同时对燃烧室壁面传热进行了计算,将冷却结构内冷却剂的流动、换热与燃烧室内流耦合,并且着重考虑了煤油作为冷却剂,其物态随温度、压力变化以及高温时出现的热/催化裂解吸热化学反应。基于实验数据发展了煤油热/催化裂解总包反应模型,对煤油热裂解和催化裂解两种过程的化学吸热性能进行了对比,研究了热/催化裂解效应对再生冷却的影响。
In order to analyze the regenerative cooling performance of supersonic combustors under wide Mach number flight conditions and to consider the effect of pyrolysis of fuel on cooling, a gas-solid-liquid heat transfer model of supersonic combustor regeneration cooling system with general versatility was developed. Indoor flow, coolant flow and cooling structure were calculated by gas-solid-liquid heat transfer coupling. Combustion chamber flow calculation model without the need of experimental measurement of static pressure data and the assumption of total temperature / heat release distribution, by directly solving the mass, momentum, energy conservation differential equations and fuel mixing and combustion model to obtain the inflow parameter distribution. At the same time, the heat transfer on the wall of the combustion chamber was calculated, and the flow and heat transfer of the coolant in the cooling structure were coupled with the flow in the combustion chamber. The kerosene as the coolant was emphatically considered. The state of the kerosene appeared as the temperature and pressure changed, Thermal / catalytic cracking Endothermic chemical reaction. Based on the experimental data, the kurtosis reaction model of kerosene thermal / catalytic cracking was developed. The chemical endotherms of kerosene pyrolysis and catalytic cracking were compared. The effects of thermal / catalytic cracking on regeneration cooling were studied.