Effect of dimples on glancing shock wave turbulent boundary layer interactions

Kontis, Konstantinos; Lada, C.; Zare‐Behtash, Hossein

doi:10.1007/s00193-007-0114-x

Cited by 19 publications

(6 citation statements)

References 21 publications

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“…1, where γ is the specific heat ratio, ρ is the density, M is the Mach number and subscripts 0 and jet refer to freestream and jet conditions. Schlieren photography [40][41][42][43][44] was employed to visualize the flow field around the cavity in a standard Z-type optical arrangement. A pair of 203.3 mm diameter parabolic mirrors with 1016 mm focal length and a 150W Hamamatsu Xenon continuous light source were used.…”

Section: Methodsmentioning

confidence: 99%

Effectiveness of jet location on mixing characteristics inside a cavity in supersonic flow

Ukai

Zare‐Behtash

Erdem

et al. 2014

Experimental Thermal and Fluid Science

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Section: Methodsmentioning

confidence: 99%

Effectiveness of jet location on mixing characteristics inside a cavity in supersonic flow

Ukai

Zare‐Behtash

Erdem

et al. 2014

Experimental Thermal and Fluid Science

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“…The position of the hot wire was measured to an accuracy of 0.25 mm with a repeatability of 0.06 mm. The pressure measurements via the aid of pressure transducers were repeated twice and had a repeatability of 99% [32].…”

Section: Methodsmentioning

confidence: 99%

Microjet Flow Control Effectiveness of Cavity Configurations at Low Speeds

Lada

Kontis

2014

Journal of Aircraft

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An experimental study was conducted to investigate the aeroacoustics of open-and closed-cavity configurations with and without flow control using microjets at low speeds. The cavity models had length-to-depth ratios of 2, 10, and 18, representing open, transitional, and closed cavities, respectively. The investigation was carried out at a flow speed of 16 meters per second. The microjet effectiveness was tested for jet velocities of 8, 16 and 24 meters per second. The vortex shedding aft of the trailing edge was reduced when the microjet velocity was equal to that of the freestream (16 meters per second). The results from the transitional cavity experiment, with a length-to-depth ratio of 10, showed that either higher microjet velocities or different locations of the microjets may be required to have any significant effect on the cavity flow characteristics. Nomenclature= voltage X c = measured distance from cavity leading edge X j = measured distance from center of jet δ = boundary-layer thickness (immediately upstream of the cavity opening) δ = boundary-layer displacement thickness (immediately upstream of the cavity opening) θ = boundary-layer momentum thickness (immediately upstream of the cavity opening) ρ ∞ = density

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“…The description of this technique along with its merits over conventional pressure measurement techniques are well documented in the literature. [32][33][34][35][36][37] The in-house developed PSP technology used in the present study has been successfully applied in a variety of flow conditions and has been found in all cases to provide accurate pressure measurements when compared to conventional pressure transducers. [38][39][40][41][42][43][44] The PSP setup consists of a LaVision Image Intense 12-bit CCD camera with a 590nm long-pass filter mounted on the lens, and UV LEDs with peak wavelength of 390nm were used for image acquisition.…”

Section: B Measurement Techniquesmentioning

confidence: 99%

Transverse jet-cavity interactions with the influence of an impinging shock

Zare‐Behtash

Kontis

et al. 2015

International Journal of Heat and Fluid Flow

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A copy can be downloaded for personal non-commercial research or study, without prior permission or chargeThe content must not be changed in any way or reproduced in any format or medium without the formal permission of the copyright holder(s) hold the flow and stabilise the combustion, is one mechanism which has attracted much attention, requiring further research to study the unsteady flow features and interactions occurring within the cavity. In this study we combine the transverse jet injection upstream of a cavity with an impinging shock to see how this interaction influences the cavity flow, since impinging shocks have been shown to enhance mixing of transverse jets. Utilising qualitative and quantitative methods:schlieren, oilflow, PIV, and PSP the induced flowfield is analysed. The impinging shock lifts the shear layer over the cavity and combined with the instabilities generated by the transverse jet creates a highly complicated flowfield with numerous vertical structures. The interaction between the oblique shock and the jet leads to a relatively uniform velocity distribution within the cavity. * Hossein.Zare-Behtash@glasgow.ac.uk

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Effect of dimples on glancing shock wave turbulent boundary layer interactions

Abstract: An experimental study has been conducted to examine the control effectiveness of dimples on the glancing shock wave turbulent boundary layer interaction produced by a series of hemi -cylindrically

Cited by 19 publications

References 21 publications

Effectiveness of jet location on mixing characteristics inside a cavity in supersonic flow

Effectiveness of jet location on mixing characteristics inside a cavity in supersonic flow

Microjet Flow Control Effectiveness of Cavity Configurations at Low Speeds

Transverse jet-cavity interactions with the influence of an impinging shock

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