Effects of transpiration cooling on flow structure and aerothermal environment of high Mach number compression corner
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摘要:
针对高马赫数压缩拐角的降热需求,通过数值模拟研究了来流马赫数为11.63条件下气体发汗对15°压缩拐角流动结构和气动热的影响。计算结果表明:气体发汗会显著增大其作用区域及下游区域的边界层厚度,降低边界层内的速度梯度并增大局部压力。当发汗位置位于流动分离区上游或内部时,在发汗作用下压缩拐角的分离区显著扩大,而当发汗位置位于流动分离区下游时,气体发汗对压缩拐角的流动分离特性几乎无影响。压缩拐角流动结构的变化显著影响了其气动热分布,边界层增厚降低了边界层内的温度梯度,从而降低了其作用区域及下游区域的壁面热流。为实现最优降热效果,发汗冷却应覆盖热流峰值附近的高热区域,同时其作用局限于下游区域,以避免分离区扩大,从而稳定热流峰值位置并有效降低峰值热流。
Abstract:In order to meet the thermal reduction requirements of high Mach number compression corners, numerical simulations were carried out to study the effects of gas transpiration on the flow structure and aerothermal environment of a 15° compression corner at a free stream Mach number of 11.63. The results showed that gas transpiration significantly increased the boundary layer thickness in both its active and downstream regions, reduced the velocity gradient within the boundary layer, and augmented the local pressure. When the transpiration location was positioned upstream or within the separation zone, gas transpiration led to a significant enlargement of the separation region. In contrast, when the transpiration location was positioned downstream the separation zone, gas transpiration had a negligible influence on the separation characteristics. Variations in the flow structure were found to significantly influence the wall heat flux distribution. The thickening of the boundary layer reduced the temperature gradient within it, thereby lowering the wall heat flux in both the transpiration region and the downstream region. To achieve optimal thermal reduction, transpiration cooling should cover the high heat flux region near the peak heat flux, while its effect remains confined to the downstream region to prevent the expansion of the separation zone, thereby stabilizing the peak heat flux location and effectively reducing the peak heat flux.
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表 1 发汗冷却计算状态
Table 1. Computation conditions of transpiration cooling
发汗冷却区域起始坐标x/m 发汗分数F/% 发汗工质 发汗冷却区域长度L/m 0.110 0.4,0.8 氩气,空气,氦气 0.055 0.450 0.8 空气 0.055 0.600 0.8 空气 0.055 0.609 0.4,0.8 空气 0.055 0.660 0.8 空气 0.055 表 2 压缩拐角计算网格参数
Table 2. Grid parameters of compression corner
编号 网格分布 网格量 第1层网格
高度/10−7 mRegrid 1 681×121 86400 10 0.552 2 881×181 166500 5 0.276 3 1321 ×241326400 1 0.055 表 3 不同发汗位置条件下的分离区参数及气动阻力
Table 3. Parameters of separation zone and drag variation at different transpiration locations
x0/m Ls/m Dp/N $ {\eta }_{ (D\text{p}) } $/% Df/N $ {\eta }_{ (D\text{f}) } $/% 无发汗 0.188 61.00 0 8.00 0 0.110 0.361 59.02 −3.25 5.63 −29.62 0.450 0.430 57.71 −5.39 5.52 −31.01 0.600 0.418 57.79 −5.26 5.18 −35.24 0.609 0.204 60.85 −0.25 6.59 −17.66 0.660 0.188 61.12 0.20 6.95 −13.09 表 4 不同发汗位置条件下的降热效果
Table 4. Effects of heat reduction at different transpiration locations
发汗冷却区域
起始坐标x/m发汗
分数F/%峰值斯坦顿数/
10−3峰值热流
降热率/%无发汗 0 5.63 0 0.110 0.8 4.68 −16.87 0.450 0.8 4.42 −21.49 0.600 0.8 4.32 −23.27 0.609 0.8 3.82 −32.15 0.660 0.8 5.58 −0.89 表 5 发汗位置位于x=0.110 m和x=0.609 m时不同发汗流量的降热效果对比
Table 5. Comparison of heat reduction effects under different transpiration flow rates with transpiration at x=0.110 m and x=0.609 m
发汗冷却区域
起始坐标x/m发汗
分数F/%峰值
斯坦顿数/10−3峰值热流
降热率/%无发汗 0 5.63 0 0.110 0.4 5.18 −7.99 0.110 0.8 4.68 −16.87 0.609 0.4 4.61 −18.12 0.609 0.8 3.82 −32.15 -
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