High-speed air rudders face extreme force/thermal environments, and the opposing jet can improve the thermal environment in the stationary point and leading edge. In order to investigate the effect and mechanism of porous opposing jet on the rudder leading edge, the numerical study is carried out by using SST k-ω turbulence model and a loose fluid-thermal-structural coupled approach. The drag reduction and thermal protection mechanism of porous jet with different pressure ratios (PRs) is comprehensively compared and analyzed. The obtained results show that the fluid-thermal-structural coupled approach is necessary for the precise aerodynamic heat prediction of air rudder. The lowest temperature regions distribute in the upstream of orifices due to the jet cooling effect and heat conduction in the solid structure. The PR is an important factor influencing the interaction between jets. The porous opposing jet can provide a good effect in both drag reduction and thermal protection, as the maximum temperature drops to about 40 % from no jet to porous jet. As PR increases, the maximum pressure and temperature also decrease to a larger extent. However, the most PR should be a balanced consideration among the flowfiled, thermal structure and coolant consume.

中文翻译：

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高速流动中多孔对射流方向舵前缘的流体-热-结构耦合研究


高速空气方向舵面临极端的力/热环境，而相反的射流可以改善静止点和前缘的热环境。为了研究多孔对射流对舵前缘的影响和机理，采用 SST k-ω 湍流模型和松散的流体-热-结构耦合方法进行了数值研究。综合对比分析了不同压力比 （PRs） 多孔射流的减阻和热防护机理。所得结果表明，流体-热-结构耦合方法对于空气舵的精确气动热预测是必要的。由于固体结构中的射流冷却效应和热传导，最低温度区域分布在孔口的上游。PR 是影响射流之间相互作用的重要因素。多孔对射流可以在减阻和热保护方面提供良好的效果，因为从无射流到多孔射流的最高温度下降到约 40%。随着 PR 的增加，最大压力和温度也更大程度地降低。然而，最 PR 应该是在流动、热结构和冷却剂消耗之间取得平衡考虑。