The tangential injection flow commingled with the mainstream could be abstracted as mixing layer, and profound importance is attached to aero-optical reduction for film-cooling target-seeking vehicles in engineering application. Leveraging the in-house code based on explicit fifth-order Weighted Compact Nonlinear Scheme and ray-tracing method, the supersonic mixing layer is numerically simulated to investigate the effect of inflow disturbance on large-scale structure growth and aero-optical reduction. The vortex growth would be stimulated somewhere when the frequency of inflow perturbation added is close to the local characteristic most unstable value. Based on such cognition, different techniques of super-harmonic and sub-harmonic disturbance are employed for effective aero-optical suppression schemes in the following research. The sub-harmonic one without phase shift shows such ability in the whole turbulent region, and additional perturbation of white noise is also promising for better control consequence.

中文翻译：

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超音速湍流混合层气动光学折减数值研究

与主流混合的切向喷射流可以抽象为混合层，并且在工程应用中对薄膜冷却寻靶车的气动光学减少具有重要意义。利用基于显式五阶加权紧凑非线性方案和射线追踪方法的内部代码，对超音速混合层进行数值模拟，以研究流入扰动对大尺度结构生长和气动光学衰减的影响。当增加的入流扰动频率接近局部特征最不稳定值时，涡旋增长会在某处受到刺激。基于这样的认识，接下来的研究将采用不同的超谐波和次谐波扰动技术来实现有效的航空光学抑制方案。