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对推力室的喷嘴多孔面板的发汗冷却和燃烧室内的燃料燃烧过程进行了耦合数值计算,建立了一个带燃烧的三维、真实气体、变物性的推力室CFD计算模型。利用UDF编写了CH_4、O_2、CO_2、H_2O气体的实际气体状态方程,并根据NIST物性数据拟合了不同温度和压力下各气体的比热容、扩散系数、黏性系数和导热系数等物性多项式。基于EDC模型建立了甲烷-氧燃烧的多步反应机理。计算了三种厚度的面板和多种燃料进口工况下的推力室内的发汗冷却和燃烧过程,研究了面板厚度、冷却剂进出条件等因素对发汗冷却和燃烧过程的影响规律。
The numerical simulation of the sweat cooling of the nozzle porous plate in the thrust chamber and the fuel combustion in the combustion chamber was carried out. A CFD calculation model for the thrust chamber with combustion, three-dimensional, real gas and variable properties was established. The real gas equation of CH_4, O_2, CO_2 and H_2O gas was written by UDF. According to NIST physical data, the physical property polynomials such as specific heat capacity, diffusion coefficient, viscosity coefficient and thermal conductivity of each gas were fitted under different temperature and pressure. Based on the EDC model, a multi-step reaction mechanism of methane-oxygen combustion was established. The sweat cooling and combustion processes in the thrust chamber with three thicknesses of panels and various fuel inlet conditions were calculated. The influences of the thickness of the slab, the condition of coolant inlet and outlet on the sweat cooling and combustion process were studied.