Reconstruction of the structural characteristic of the refractive index and average air density in a shock wave arising in a supersonic flow past obstacles from optical measurements

Banakh, V. A.; Marakasov, D. A.; Sukharev, A. A.

doi:10.1134/s0030400x11130029

Cited by 13 publications

(7 citation statements)

References 2 publications

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“…We propose that a shock wave formed near the aircraft nose can be modeled as a shock wave arising in the supersonic flow flowing around a conical body [15].…”

Section: Formulation Of the Problem And Basic Relationsmentioning

confidence: 99%

“…1). In simulation of random phase screens we used the Kolmogorov model of spectrum of spatial inhomogeneities of n 0 z; r [15,22,23]. Beyond the shock wave in free space we took into account only the beam diffraction.…”

Section: Formulation Of the Problem And Basic Relationsmentioning

confidence: 99%

“…The results of experimental and theoretical studies of optical turbulence in supersonic flows (SFs) are presented in [13][14][15][16][17] as well. The experiments [13,17] on laser probing the SF were performed with the use of a jet module of T-326 wind tunnel (WT) of the Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences.…”

Section: Introductionmentioning

confidence: 99%

“…In [15], the approach [14] was used to study optical turbulence in the area of the shock wave arising in the supersonic axisymmetric air flow flowing around a conical body. It was shown that the spatial structure of optical turbulence in the vicinity of the shock wave near the cone is inhomogeneous.…”

Section: Introductionmentioning

confidence: 99%

“…However, with the distance from the surface of the aerodynamic cone, the value of C 2 n decreases fast. In this paper based on the optical model of a shock wave [15], we study the distortions of an optical beam propagating from an aircraft moving with supersonic speed.…”

Section: Introductionmentioning

confidence: 99%

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Optical beam distortions induced by a shock wave

2015

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The mean intensity and the displacement from the initially given propagation direction of the optical beam passed through the shock wave have been calculated. It has been shown that the spatial inhomogeneity of the refractive index of air caused by the shock wave arising in supersonic flow flowing a conical body can cause the focusing of the beam and strong anisotropic distortions of the intensity distribution in its cross section. The angular displacement of the optical beam from the initially given propagation direction owing to the shock wave depends only on the height above the Earth's surface at which the shock wave is formed. As the height increases, the influence of the shock wave on the optical beam propagating through it decreases.

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“…We propose that a shock wave formed near the aircraft nose can be modeled as a shock wave arising in the supersonic flow flowing around a conical body [15].…”

Section: Formulation Of the Problem And Basic Relationsmentioning

confidence: 99%

Section: Formulation Of the Problem And Basic Relationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical beam distortions induced by a shock wave

2015

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Analysis on the influence mechanism of conical shock wave on pulsed laser forward detection

Yao

Zhang

et al. 2019

Optik

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Numerical laser beam propagation using large eddy simulation of a jet engine flow field

et al. 2015

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In certain directed infrared countermeasure (DIRCM) situations, the laser beam path may have to pass close to the engine exhaust plume of the aircraft and models of plume turbulence are needed for DIRCM performance simulations. The jet engine plume was modeled using large eddy simulation (LES), providing time resolved information about the large scale turbulent eddies. The refractive index data from the LES calculations were integrated along the propagation path to produce time resolved phase screens for optical beam propagation. The phase screens were used to calculate laser beam parameters including beam wander and power-in-bucket (PIB). Numerical beam propagation resulted in a root-mean-square beam wander of 200 μrad for the small turbojet engine studied. The PIB was calculated for beams with 80 μrad and 2 mrad divergence having equal beam diameter when passing through the plume. For the beam with low divergence, the average PIB was reduced from 0.23 to 0.040, while the beam with wider divergence showed no significant reduction. In both cases, the plume introduced significant temporal variation of the instantaneous PIB. The beam wander is not affected by the divergence, but only depends on beam size. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/17/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 085101-2 August 2015 • Vol. 54(8) Henriksson et al.: Numerical laser beam propagation using large eddy simulation of a jet engine flow field Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/17/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Optical Engineering 085101-9 August 2015 • Vol. 54(8) Henriksson et al.: Numerical laser beam propagation using large eddy simulation of a jet engine flow field Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 08/17/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Reconstruction of the structural characteristic of the refractive index and average air density in a shock wave arising in a supersonic flow past obstacles from optical measurements

Cited by 13 publications

References 2 publications

Optical beam distortions induced by a shock wave

Optical beam distortions induced by a shock wave

Analysis on the influence mechanism of conical shock wave on pulsed laser forward detection

Numerical laser beam propagation using large eddy simulation of a jet engine flow field

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