Designing a fuzzy logic controller for the Reynolds number in a blowdown supersonic wind tunnel

Shahrbabaki, Amin Nazarian; Bazazzadeh, Mehrdad; Manshadi, Mojtaba Dehghan; Shahriari, Ali

doi:10.1109/aero.2014.6836242

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…Here, a 1 is a tting parameter, which can be expressed as a 1 475(κ 0 ) 2m 1 where κ 0 (2π/l 0 ) m 1 − 0.7 in which l 0 represents the inner scale of anisotropic turbulent plasma. e relation between L 0 and l 0 can be expressed as follows [26]:…”

Section: The Wave Structure Function Through Thementioning

confidence: 99%

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Alkelly

Khaled

Hassan

2022

International Journal of Optics

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The propagation properties of partially coherent circular flat-topped (FT) vortex hollow/nonvortex beams are studied in anisotropic turbulent plasma. The analytical expression of the optical intensity of these beams is obtained by employing the extended Huygens–Fresnel integral. The effects of the source and turbulent plasma parameters on the intensity distribution of partially coherent circular FT vortex hollow/nonvortex beams are analyzed numerically. The results show that partially coherent circular FT vortex hollow/nonvortex beams will finally converge into a Gaussian intensity profile at increasing propagation distances. The results also showed that the partially coherent FT vortex hollow/nonvortex beams with higher coherence are less affected by anisotropic turbulent plasma than the less coherent beams.

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Section: The Wave Structure Function Through Thementioning

confidence: 99%

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Alkelly

Khaled

Hassan

2022

International Journal of Optics

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“…where   (x, y) is the transverse spatial frequency, 2 Note that the relationship between L0 and l0 satisfies [46] 3/ 4 0…”

Section: Anisotropic Power Spectrum For Plasma Turbulencementioning

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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“…In the present study, the Reynolds number Re = 5 × 10 5 /m [20]. The Markov approximation is employed to obtain the anisotropic power spectra equation.…”

Section: Power Spectrum Of Refractive Index Fluctuation In Hypersonicmentioning

confidence: 99%

Electromagnetic scattering characteristics of foil in hypersonic plasma turbulence

Gong

2019

IET Microwaves, Antennas & Propagation

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To investigate the electromagnetic scattering problem related to a foil in a turbulent hypersonic plasma environment, the scattering field formulas for hypersonic plasma turbulence were improved by applying the anisotropic power spectrum. Using the theory of electromagnetic scattering of a conducting object, the second moment of a conducting object's scattering field is obtained in the hypersonic plasma turbulence. Finally, the backscattering cross‐section of the foil surrounded by the hypersonic plasma turbulence was calculated. The results showed that the fractal dimension led to an increase in the complexity of the hypersonic turbulent structure, and thus had a greater influence on the electromagnetic wave scattering. The scattering cross‐section of the foil in the hypersonic turbulence decreases rapidly. Meanwhile, the anisotropic parameters in the model represent scale‐dependent stretching of the turbulent eddy. As the anisotropic parameters of the turbulence increase, there will be less scattering of the hypersonic turbulence. At this point, the total scattering cross‐section of the foil in hypersonic plasma turbulence increases gradually. By improving the aerodynamic shape of the aircraft, it can produce a large number of anisotropic turbulent eddies which can effectively improve the passive jamming capability when the foil is cast.

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Designing a fuzzy logic controller for the Reynolds number in a blowdown supersonic wind tunnel

Cited by 9 publications

References 11 publications

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma

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

Electromagnetic scattering characteristics of foil in hypersonic plasma turbulence

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