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Multi-resolution analysis of aero-optical effects in a supersonic turbulent boundary layer

机译：超声波湍流边界层中航空光学效应的多分辨率分析

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Studying the aero-optical effects induced by turbulent structures with different scales helps determine the capture scale of turbulent structures in experiments/calculations and improve the turbulence breakup device. In this paper, the density field of a supersonic turbulent boundary layer a t Ma = 3.0 was measured based on the nano-tracer plane laser scattering technique. Two-dimensional orthogonal wavelet multi-resolution analysis was applied to obtain information about different flow scales. The ray-tracing method simulates the propagation of a Gaussian plane beam through the nonuniform flow field at different resolutions. The results show that the turbulent boundary layer thickness and its calculation method lead to the difference in scaling calculation results among the existing experiments. The turbulent structures about 0.7 delta contribute most to aero-optical effects. With the reduction of the resolution, the contribution of small turbulent structures to aero-optical effects reduces obviously. When the minimum scale of turbulent structures captured is larger than 0.072 delta, the resolution can no longer reflect the real aero-optics results of turbulent structures. The smallest optically active scale predicted is 0.017 delta in Mani's theory. The turbulent structures smaller than 0.018 delta have little effect on optical path difference (OPD), and the higher-order quantities change significantly around 0.009 delta similar to 0.018 delta. According to experimental results, it is promising to improve the aero-optical suppression effects by breaking the large eddy into the turbulent structures smaller than 0.018 delta, or even 0.009 delta. (C) 2021 Optical Society of America
机译：研究不同尺度湍流结构的气动光学效应，有助于在实验/计算中确定湍流结构的捕获尺度，改进湍流破碎装置。本文利用纳米示踪平面激光散射技术测量了a t Ma=3.0的超声速湍流边界层的密度场。采用二维正交小波多分辨率分析方法，获得了不同流动尺度的信息。光线跟踪法模拟了高斯平面光束在不同分辨率的非均匀流场中的传播。结果表明，由于湍流边界层厚度及其计算方法的不同，现有实验的定标计算结果存在差异。约0.7δ的湍流结构对气动光学效应贡献最大。随着分辨率的降低，小湍流结构对气动光学效应的贡献明显减小。当捕捉到的湍流结构的最小尺度大于0.072 delta时，分辨率不再能够反映湍流结构的真实气动光学结果。根据马尼的理论，预测的最小光学活动标度为0.017δ。小于0.018δ的湍流结构对光程差（OPD）影响不大，高阶量在0.009δ附近变化显著，类似于0.018δ。根据实验结果，将大涡破碎成小于0.018δ甚至0.009δ的湍流结构，有望改善气动光学抑制效果。（2021）美国光学学会

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  • 来源
    《Applied optics》 |2021年第8期|共10页
  • 作者

    Zhang Bo; He Lin; Yi Shihe; Ding Haolin;

  • 作者单位

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Changsha 410073 Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Changsha 410073 Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Changsha 410073 Peoples R China;

    Natl Univ Def Technol Coll Aerosp Sci &

    Engn Changsha 410073 Peoples R China;

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