Aero-optical reduction in flat-plate turbulent boundary layer has been widely concerned due to critical application for high-speed target-seeking vehicles. From the perspective of disciplinary intersection between aerodynamic and optical engineering, the turbulence-aberrated optical behaviour, in high-Reynolds-number supersonic freestream, is numerically investigated using the in-house code High-Order SimulaTor for Aerodynamics (HOSTA) and ray-tracing scheme. To evaluate the efficiency of wall cooling strategy to reduce the detrimental aero-optical distortions, the authors leverage the theoretical equation deduced from Sutton statistic model for mutual verification with the simulative results. Additionally, based on the beneficial wall cooling effects on turbulent aero-optical reduction, comparison suggests that refrigeration directly towards the turbulence section is the most effective rather than cooling the laminar or transitional region. In further discussion, wall blowing, suction and combinational blowing and suction schemes are issued. Results reveal the rationality of employing proper suction amplitude to modify the flow into laminar state, and sufficiently high suction intensity is also promising in turbulent aero-optical reduction despite the fact of low efficiency currently. The current study puts an eye on the simulation concerning three-dimensional supersonic turbulent flow in high-Reynolds-number freestream and the application of statistic model, and future investigation is suggested for higher effectiveness of aero-optical suppression.

中文翻译：

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超音速湍流边界层的气动光学抑制

由于高速寻靶飞行器的关键应用，平板湍流边界层的气动光学减少受到广泛关注。从空气动力学和光学工程之间的学科交叉的角度来看，使用内部代码高阶空气动力学模拟器 (HOSTA) 和射线追踪对高雷诺数超音速自由流中的湍流像差光学行为进行了数值研究方案。为了评估壁冷却策略以减少有害的气动光学失真的效率，作者利用从萨顿统计模型推导出的理论方程与模拟结果进行相互验证。此外，基于对湍流气动光学减少的有益壁冷却效果，比较表明直接朝向湍流部分的制冷是最有效的，而不是冷却层流或过渡区域。在进一步的讨论中，提出了壁吹、吸入和组合吹吸方案。结果揭示了采用适当的吸力幅度将流动改变为层流状态的合理性，尽管目前效率低下，但足够高的吸力在减少湍流气动光学方面也很有前景。目前的研究着眼于高雷诺数自由流中三维超声速湍流的模拟和统计模型的应用，并建议进一步研究以提高气动光学抑制的有效性。