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

Sun, Xi-wan; Yang, Xiaoliang; Liu, Wei

doi:10.1007/s42405-020-00304-4

Cited by 6 publications

(2 citation statements)

References 38 publications

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“…At present, research on the mechanism of aero-optical effects mainly focuses on the change in the turbulent density field on the optical path. By analyzing the refractive index field near the turbulent boundary layer (TBL), the phase distortion caused by a high-speed flow field is studied through the ray-tracing method [24,25]. In fact, the research process only completes the analysis of the deflection effects of large-scale turbulent vortex structures on the light transmission at the macro characteristic level and cannot accurately describe the energy loss of light transmission in turbulence.…”

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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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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“…The essence of the process can be attributed to the scattering of photon energy in multiple directions after the "collision" between airflow molecules and photons 6 . At present, the scattering analysis of light in high-speed turbulence is to simplify the airflow molecules into a macroscopic polymer called "the transmission medium" [7][8][9] . For the low-speed simple flow field, its spatial pulsation is small.…”

Section: Introductionmentioning

confidence: 99%

A new method for analysing photon-scattering in high-speed turbulence

Yang

Zhang

et al. 2022

Third International Conference on Computer Science and Communication Technology (ICCSCT 2022)

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Optical scattering caused by the high-speed turbulence will reduce the accuracy of optical sensors on aircraft. The existing research mainly focuses on the scattering field on the macro scale. A new method to analyse the photon-scattering characteristics in high-speed turbulence from the micro point of view is proposed in this paper, which can explain the micro disturbance of airflow molecules to photons. In order to construct the relationship between micro disturbance and macro distortion, molecular clusters are proposed to describe the multi-molecular scattering field, and the scattering characteristics of molecular clusters with wavelength, density and vortex shape are obtained by statistical method. The simulation results show that the coherent superposition of scattered waves is the dominant factor of the micro scattering characteristics of molecular clusters. The method proposed in this paper provides a new idea for the study of aero-optics under complex flow conditions.

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Effective aero-optical suppression by steady wall blowing and wall suction schemes for supersonic turbulent boundary layer

et al. 2022

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As a basic flow model for engineering applications, wall-bounded turbulent flow has been widely studied in the field of aero-optics, but the flow control methods that could effectively suppress aero-optical effects are relatively rare. As an urgent requirement in engineering application, the concept of the steady wall blowing and suction is proposed by the author. Firstly, the author briefly described the flow model and physical method. Secondly, the choice of disturbance type is given. Then, the results of wall blowing-suction, suction and blowing ways based on steady and unsteady disturbance are compared. Finally, it is concluded that employing the high steady wall blowing disturbance (A = 0.2) could realise aero-optical suppression by around 20%. Besides, the steady wall suction scheme contributes to about 70%–80% reduction effect within a wide amplitude range (A = 0.2–1.0), which suppresses this effect by maintaining laminar state downstream contrasted by the baseline case.

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

Cited by 6 publications

References 38 publications

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

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

A new method for analysing photon-scattering in high-speed turbulence

Effective aero-optical suppression by steady wall blowing and wall suction schemes for supersonic turbulent boundary layer

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