Influence of turbulence structure with different scale on aero-optics induced by supersonic turbulent boundary layer

Ding, Haolin; Yi, Shihe; Ouyang, Tianci; Shi, Yang; He, Lin

doi:10.1016/j.ijleo.2019.163565

Cited by 13 publications

(4 citation statements)

References 23 publications

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“…However, when hypersonic vehicles fly at a high speed in the atmosphere, complex flow structures, such as turbulent boundary layers, shock waves, and expansion waves and mixed layers, may be formed outside the optical window, which makes the density field, temperature field, and velocity field of the air change dramatically [ 5 , 6 ]. When light passes through the complex flow field, the high-speed flow field will disturb the transmission of light and cause optical distortion; that is, aero-optical effects which can make the target image formed by imaging detection equipment appear subject to energy attenuation, offset, blur, jitter, and other phenomena [ 7 , 8 , 9 , 10 ]. Therefore, the research of aero-optical effects is of great significance for the application of optical sensors in hypersonic vehicles.…”

Section: Introductionmentioning

confidence: 99%

A Quick Simulation Method for Aero-Optical Effects Based on a Density Proxy Model

Yang

Liu

et al. 2023

Sensors

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Aero-optical effects caused by high-speed flow fields will interfere with the transmission of starlight, reduce the accuracy of optical sensors, and affect the application of celestial navigation on hypersonic vehicles. At present, the research of aero-optical effects relies heavily on the flow field simulation of computational fluid dynamics (CFD), which requires a great deal of computing resources and time, and cannot satisfy the demand of the rapid analysis of aero-optical effects in the engineering design stage. Therefore, a quick simulation method for aero-optical effects based on a density proxy model (DP-AOQS) is proposed in this paper. A proxy model of the turbulent density field is designed to replace the density field in the CFD simulation, and the proxy model is parametrically calibrated to simulate the optical characteristics of the turbulent boundary layer (TBL) in the external flow field of the optical window. The performance of DP-AOQS in the visible light band is verified from the perspectives of density field distribution, optical path difference (OPD), and fuzzy star map. The simulation results show that the method can quickly provide the distortion results of aero-optical effects in different flight conditions on the premise of ensuring the simulation accuracy. The research in this paper provides a new analytical method for the study of aero-optical effects.

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Section: Introductionmentioning

confidence: 99%

A Quick Simulation Method for Aero-Optical Effects Based on a Density Proxy Model

Yang

Liu

et al. 2023

Sensors

View full text Add to dashboard Cite

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“…The high-frequency sampling structure of high-speed turbulence could be obtained via laser scattering technology [13,14]. Through a statistical analysis, it could be found that the distortion characteristics caused by aero-optical effects are closely related to different turbulence scale structures [15][16][17][18][19][20]. Vortex structures of different scales can lead to different errors in optical sensors.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Analyzing the Aero-Optical Effects of Hypersonic Vehicles Based on a Microscopic Mechanism

Yang

Liu

et al. 2022

Aerospace

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Aero-optical effects are the key factors that restrict the accuracy of the optical sensors of hypersonic vehicles, and the numerical simulation of aero-optical effects is a powerful tool with which to analyze aero-optical distortion. Most existing research focuses on the simulation analysis of refraction distortion based on the density field at the macro level via the ray-tracing method. In this paper, a method for analyzing aero-optical effects based on the interaction between photons and gas molecules is proposed and can explain the optical distortion and energy dissipation caused by aero-optical effects at the micro level. By establishing a transmission model of photons in turbulence, a simulation method of aero-optical effects based on a microscopic mechanism is designed and breaks through the limitations of a traditional macro method in energy analyses. The optical distortion parameters based on photonics are compared with the physical quantities of traditional aero-optical effects, which verifies the effectiveness of the micro analysis on the macro scale and provides a new idea for studying the microscopic mechanism of aero-optical effects.

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“…Airborne infrared (IR) optical systems play an important role in airborne remote sensing. Aerodynamic optical distortion has become a serious concern in imaging systems with the development of aerospace technology [1][2][3][4][5][6][7][8]. Large density gradients of turbulent compressible flow around the optical window are the direct reasons for aero-optical distortions.…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Imaging Simulation Method of Infrared Aero-Optical Effect Based on Continuously Varying Gaussian Superposition Model

Zhang

Chen

et al. 2022

Sensors

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Aero-optical effect correction has become a crucial issue in airborne infrared imaging. However, it is impractical to test the correction algorithm using flight tests and numerical simulation because of its high cost. This study proposes a dynamic imaging simulation method for the infrared aero-optical effect based on a continuously varying Gaussian superposition model. The influence of infrared image degradation under different high-speed aerodynamic flow fields was investigated in detail. A continuously varying Gaussian superposition model was established for flight speed, altitude, and attitude. A dynamic infrared scene simulation model was constructed. Experimental results show that the proposed method can realistically simulate actual aero-optical effects of any flight case. Moreover, it can simulate continuous frames of aerodynamically degraded infrared images. The method uses a simpler model than numerical simulation and provides more data for multitype tasks.

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Influence of turbulence structure with different scale on aero-optics induced by supersonic turbulent boundary layer

Cited by 13 publications

References 23 publications

A Quick Simulation Method for Aero-Optical Effects Based on a Density Proxy Model

A Quick Simulation Method for Aero-Optical Effects Based on a Density Proxy Model

A New Method for Analyzing the Aero-Optical Effects of Hypersonic Vehicles Based on a Microscopic Mechanism

A Dynamic Imaging Simulation Method of Infrared Aero-Optical Effect Based on Continuously Varying Gaussian Superposition Model

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