Research on aero-optical prediction of supersonic turbulent boundary layer based on aero-optical linking equation

Ding, Haolin; Yi, Shihe; Zhao, Xianwei; Yi, Junru; He, Lin

doi:10.1364/oe.26.031317

Cited by 36 publications

(13 citation statements)

References 21 publications

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“…It is observed that for a narrow light pupil (Ap ¼ 0.01, with only a single streamwise sampling point), the spectrum intensity declines slowly before Sr ¼ 1 while greatly after this value, and the slope in high frequency region (À1.675, calculated by linear regression analysis) extremely approaches À5/3, which might be a reflection of the dominance of Kolmogorov-type turbulence at small-scale regime. Additionally, the power exponent before Sr ¼ 1 (À0.45) is close to that measured by Ding et al 48 (À0.43) in a Ma 1 ¼ 3 wind tunnel. Also, the spectrum distributions by numerical result in the current study are noisier than the experimental data, implying its ability in presenting more refined optical response.…”

Section: Opd Rms Frequency Spectrumsupporting

confidence: 87%

“…Additionally, the power exponent before Sr = 1 (−0.45) is close to that measured by Ding et al. 48 (−0.43) in a Ma ∞ = 3 wind tunnel. Also, the spectrum distributions by numerical result in the current study are noisier than the experimental data, implying its ability in presenting more refined optical response.…”

Section: Aero-optical Response For Turbulent Boundary Layersupporting

confidence: 87%

“…A deeper investigation into the aero-optical phenomenon might come down to the frequency spectrum, which could reveal the inner relationship between the instantaneous OPD distributions with flow mechanism, 11,48 namely the characteristic size and velocity of large-scale structures. Hence, it deserves a probe into the effect of the light aperture size on the OPD rms frequency spectrum.…”

Section: Aero-optical Response For Turbulent Boundary Layermentioning

confidence: 99%

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Validation case for supersonic boundary layer and turbulent aero-optical investigation in high-Reynolds-number freestream by WCNS-E-5

Sun

Liu

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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Turbulent flat-plate boundary layer flows have been widely employed for numerical validation in the aero-optical field. In present study, the laminar-to-turbulent evolution induced by wavy roughness in high-Reynolds-number supersonic freestream is investigated using a numerical technique based on the fifth-order weighted compact nonlinear scheme (WCNS-E-5). The computational procedure and post-processing method are described in detail, and the acquired instantaneous flow structure and statistical data are compared with other theoretical, experimental, and numerical results to demonstrate the feasibility of predicting turbulence using WCNS-E-5. Further, to reduce the computational resources required to simulate turbulent flow, a velocity correlation function is introduced to decrease the computational domain in the spanwise direction. Additionally, the effects of different grid sizes on the simulation results are examined by reducing the number of cells in the streamwise, wall-normal, and spanwise directions. Finally, the authors conduct a tentative investigation into the aero-optical effects of the laminar-to-turbulent flowfield using a ray-tracing method, considering both the feasibility of aero-optical detection and the effect of grid scale on the time-averaged imaging quality, as well as a deeper probe into the characteristic structures reflected by aero-optical frequency spectrum. The results elucidated that the wall-normal grid number has the strongest influence on the transitional location, and undoubtedly affects wavefront aberrations. However, different gird scales lead to similar aero-optical spectrum, and revealed the Kolmogorov-type turbulence at small-scale regime. As a prelude to further aero-optical simulations of wall-bounded flows, the current study provides some reference for the code validation process and aero-optical interrogation.

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Section: Opd Rms Frequency Spectrumsupporting

confidence: 87%

Section: Aero-optical Response For Turbulent Boundary Layersupporting

confidence: 87%

Section: Aero-optical Response For Turbulent Boundary Layermentioning

confidence: 99%

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Validation case for supersonic boundary layer and turbulent aero-optical investigation in high-Reynolds-number freestream by WCNS-E-5

Sun

Liu

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The plasma turbulence is a turbulent shear flow. Refer to the Nano-based Planar Laser Scattering (NPLS) experiment image [13]. The plasma turbulence has the characteristics of non-uniform and anisotropic.…”

Section: Anisotropic Power Spectrum For Plasma Turbulencementioning

confidence: 99%

“…signal loss is very small, which provides a new idea to alleviate the "blackout" problem. In the early research, many researchers used ray tracing and geometric optics methods, mainly focusing on physical quantities such as optical path differences (OPD) [11][12][13] and Strehl ratios (SR) [14,15]. Some researchers also regard the shock layer as a strongly turbulent medium and use the refractive index power spectrum of atmospheric turbulence to layer the sheath to study the propagation and distortion characteristics of optical beam and the influence on imaging quality [16,17].…”

mentioning

confidence: 99%

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

et al. 2021

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The explicit expression of orbital angular momentum (OAM) spiral spectrum of Laguerre-Gaussian (LG) beam propagating in anisotropic plasma turbulence is derived based on Rytov theory. The relationship between the detection probability of OAM and the crosstalk with the anisotropy parameters, topological charge, radial index, wavelength, beam width, receiving aperture, inner and outer scales are discussed in detail. In order to quantify the effect of plasma turbulence, we compared it with atmospheric turbulence based on restriction function. To optimize OAM detection probability, we also compared the effects of circular aperture method(CAM) with focusing mirror method(FMM) on the propagation characteristics of the spiral spectrum. The results show that even in the strong turbulence region of atmospheric turbulence, the radial dimension of LG beam in plasma turbulence is nearly twice that of atmospheric turbulence and the modes crosstalk has almost reached its upper bound. Besides, by comparing the two optimization methods, we found the ability to reduce crosstalk is related to the choice of beam width and receiving aperture. Therefore, we give a method to optimally select between the CAM and the FMM. We found the corresponding relationship and gave an analytical formula. The FMM has a greater ability to reduce crosstalk than the CAM when the beam width≥4cm and the aperture≥3cm. We quantified the effect of plasma turbulence and provide a guideline for the selection of beam width and receiving aperture under these two optimization methods. The research results may be helpful in the field of optical communication.

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Numerical Investigation on Aero-optical Reduction for Supersonic Turbulent Mixing Layer

Sun

Yang

Liu

2020

Int. J. Aeronaut. Space Sci.

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Research on aero-optical prediction of supersonic turbulent boundary layer based on aero-optical linking equation

Cited by 36 publications

References 21 publications

Validation case for supersonic boundary layer and turbulent aero-optical investigation in high-Reynolds-number freestream by WCNS-E-5

Validation case for supersonic boundary layer and turbulent aero-optical investigation in high-Reynolds-number freestream by WCNS-E-5

Spiral Spectrum of a Laguerre-Gaussian Beam Propagating in Anisotropic Turbulent Plasma

Numerical Investigation on Aero-optical Reduction for Supersonic Turbulent Mixing Layer

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