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通过数值计算的方法对全覆盖气膜冷却结构的流场特性、壁面表面传热系数、绝热壁面气膜冷却效率以及考虑固体导热影响下的综合冷却效率进行了对比研究.结果显示:相反横向射流角产生的反肾形涡对使冷气侧向扩散能力更强;虽然表面传热系数升高,但是由于较高的绝热壁面气膜冷却效率降低了传入固体壁面的热量,提升综合冷却效率.吹风比为1.0时,45°相反横向射流角斜孔有最高的综合冷却效率.当吹风比为1.5和2.0时,30°相反横向射流角斜孔有最高综合冷却效率.与相同横向射流角斜孔作对比,15°相反横向射流角斜孔综合冷却效率不及15°相同横向射流角斜孔,45°,60°相反横向射流角斜孔综合冷却效率在不同流向长度上与相同横向射流角斜孔综合冷却效率相差不大,30°相反横向射流角斜孔综合冷却效率高于相同横向射流角斜孔.
The flow field characteristics, the surface heat transfer coefficient, the cooling efficiency of gas film on adiabatic wall and the overall cooling efficiency under the influence of solid thermal conductivity were investigated by numerical calculation. The results show that the opposite transverse jet The anti-kidney-shaped vortex generated by the angle angle makes the lateral diffusivity of the cooling air stronger. Although the surface heat transfer coefficient increases, the higher the cooling efficiency of the gas film on the adiabatic wall reduces the heat transferred to the solid wall and enhances the overall cooling efficiency. When the blowing ratio is 1.0, the maximum integrated cooling efficiency is obtained at 45 ° opposite to the transverse jet angle. The maximum integrated cooling efficiency is achieved at 30 ° opposite to the cross jet direction when the blowing ratio is 1.5 and 2.0. Opposite transverse jet at 15 ° Slanting hole Integrated cooling efficiency less than 15 ° Same lateral jet angle Slant hole, 45 °, 60 ° Opposite lateral jet angle Slant hole Comprehensive cooling efficiency The same lateral jet angle at different flow lengths The overall cooling efficiency of the hole is not much difference, 30 ° opposite transverse jet angle inclined hole comprehensive cooling efficiency is higher than the same horizontal jet angle oblique hole.