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首页> 外文期刊>Aerospace science and technology >Wavefront distortion due to the shock wave and boundary layer in the supersonic flow over a compression ramp
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Wavefront distortion due to the shock wave and boundary layer in the supersonic flow over a compression ramp

机译：由于压缩斜坡上超声波流动中的冲击波和边界层导致的波前畸变

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Optical devices equipped in supersonic flight vehicles are subjected to distortions of optical paths due to aero-optical effects, potentially resulting in the degradation of sensing and imaging performance. In this study, the aero-optical effects of the supersonic flow over a two-dimensional compression ramp are investigated through experimental and numerical methods. The experiment is conducted by measuring the wavefront of the laser beam propagated through the test section of a supersonic wind tunnel using a two-dimensional Shack-Hartmann sensor. The individual contribution of the shock wave and boundary layer to the wavefront distortion is identified by conducting a ray-tracing computation through the density of the flow field obtained from a two-dimensional numerical simulation that solves the Reynolds-averaged Navier-Stokes equations. The numerically-obtained wavefront is compared with the time-averaged wavefront measured using the Shack-Hartmann sensor. The deflection angle of the ray at the center of the laser beam is analyzed to assess the aero-optical effects caused by the shock wave and boundary layer. The individual contribution of the shock wave and boundary layer to the wavefront distortion was analyzed for various incidence angles of the laser beam. For the present experimental setup, as boundary layers at the top and bottom walls have the opposite direction of the density gradient, the resultant laser beam deflections are mostly governed by the density gradient across the shock wave. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：由于航空光学效应，在超音速飞行车辆中配备的光学装置的光学装置潜在地导致感测和成像性能的劣化。在这项研究中，通过实验和数值方法研究了超声波流量在二维压缩斜坡上的空气光学效应。通过使用二维棚屋传感器测量通过超声波风隧道的试验部分传播的激光束的波前进行实验。通过通过从由二维数值模拟获得的流场的密度进行射线跟踪计算来识别冲击波和边界层到波前失真的各个贡献通过解决reynolds平均的Navier-Stokes方程。将数值获得的波前与使用Shack-Hartmann传感器测量的时间平均波前进行比较。分析了激光束中心处的光线的偏转角，以评估由冲击波和边界层引起的气态效应。分析了激光束的各种入射角的冲击波和边界层对波前变形的各个贡献。对于本实验设置，作为顶壁处的边界层具有密度梯度的相反方向，所得到的激光束偏转主要由冲击波穿过密度梯度来控制。 （c）2021 Elsevier Masson SAS。版权所有。

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