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基于Roe-FDS格式,采用标准k-ε湍流模型对某液氧煤油发动机喷管内部燃气流对喷管内壁的对流传热换热系数进行了数值仿真与研究,分析了网格雷诺数以及恒温壁壁温对喷管内壁对流换热系数的影响。当近壁面网格第一层法向高度为10-3 mm数量级时,仿真结果与工程估算公式的计算结果相吻合。同时,在一定范围内,对流换热系数随来流速度的增大而增大,恒温壁的壁温对对流换热系数的影响则较小。
Based on Roe-FDS, a standard k-ε turbulence model was used to numerically simulate and study the convective heat transfer coefficient of gas flow inside a nozzle of a liquid oxygen-kerosene engine to the inner wall of the nozzle. The grid Reynolds number Influence of Wall Temperature on Convection Heat Transfer Coefficient of Inner Wall of Nozzle. When the normal height of the first layer of the near-wall grid is in the order of 10-3 mm, the simulation results are consistent with the calculation results of the engineering estimation formula. At the same time, the convective heat transfer coefficient increases with the increase of the flow velocity within a certain range, and the influence of the wall temperature of the thermostatic wall on the convective heat transfer coefficient is smaller.