Supersonic Flows in Channels and Jets when Applied to the Problems of Designing Aerodynamic Windows of Gas Lasers

Волков, К. Н.; Emel’yanov, V. N.; Pustovalov, Alexander

doi:10.1007/s10891-015-1302-7

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…As the index of refraction in air is proportional to its density, density gradients within the flowfield lead to a distortion of the wavefront as it passes through the flow. The performance of these systems is often limited by the interaction of the optical wavefront entering or exiting the aircraft with the turbulent flow surrounding the aircraft [1].…”

Section: Introductionmentioning

confidence: 99%

Aero-optical effects in free and wall-bounded turbulent compressible flows

et al. 2018

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The optical aberrations induced by turbulent compressible flows are a serious concern in airborne communication, imaging and optical systems because the quality of the laser beam degrades due to variations of the index of refraction along its path. The aero-optical aberrations produced by compressible flows are a direct consequence of the detailed physics of the flow. Time-accurate computational study of aero-optical distortions is performed based on large-eddy simulation technique because of its ability to account for the optical phase errors due to anisotropy of the flowfield and to resolve large-scale coherent structures at a reasonable computational cost. The results of numerical simulation of turbulent compressible flows in a flat plate boundary layer, free mixing layer and free jet provide general statistics of optical distortions by examining the time-averaged intensity pattern and instantaneous flowfield. The developed computational tools and results are beneficial in design and optimization of optical systems, where the control of laser beam propagation is an important problem, and coherent optical adaptive equipment and techniques based on the optical detection of light-scattering properties of the flow.

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Section: Introductionmentioning

confidence: 99%

Aero-optical effects in free and wall-bounded turbulent compressible flows

et al. 2018

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Experimental and Computational Modeling of the Processes of Supersonic Outflow from a Half-Closed Channel

Abashev

Eremkin

Zhivotov

et al. 2018

J Eng Phys Thermophy

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Aerodynamic Window Sealing of a Large-Aperture Channel for High-Power Laser Transmission

Huang

Shi

et al. 2022

Applied Sciences

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In this study, the sealing of a large-aperture channel for high-power laser transmission is achieved using an aerodynamic window. Further, a numerical model of the gas and dust particle motion in the channel is established under three different blowing schemes, and the sealing performance of the large-aperture channel is analyzed and compared under different blowing schemes. The results indicate that the larger the proportion of purge gas volume flows in the axial direction, the better the sealing effect of the channel. More importantly, the axial blowing scheme can ensure that the large-aperture channel maintains the relative positive pressure to the external environment, effectively blocking the ambient gas and dust particles blowing in. The axial blowing scheme can achieve the sealing requirements of the large-aperture channel in an environment where the ambient wind speed is less than 20 m/s, and the dust particle mass concentration is less than 8×10−3 kg/m3. In this case, the minimum non-zero z-directional wind speed is stable and positive at a position 100 mm away from the port in the channel, and the particle mass concentration is zero.

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Supersonic Flows in Channels and Jets when Applied to the Problems of Designing Aerodynamic Windows of Gas Lasers

Cited by 3 publications

References 7 publications

Aero-optical effects in free and wall-bounded turbulent compressible flows

Aero-optical effects in free and wall-bounded turbulent compressible flows

Experimental and Computational Modeling of the Processes of Supersonic Outflow from a Half-Closed Channel

Aerodynamic Window Sealing of a Large-Aperture Channel for High-Power Laser Transmission

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