Characterization of Micro-Vortex Generators in Supersonic Flows

Nolan, William; Babinsky, Holger

doi:10.2514/6.2011-71

Cited by 22 publications

(16 citation statements)

References 13 publications

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“…The wake velocity magnitude evolves when travelling downstream, which can be represented through a decay process. Babinsky et al [4] and Nolan & Babinsky [21] measured the wake velocity decay resulted from micro ramps with different heights. Their studies discovered that the maximum deficit velocity (Umin within the wake region) follows similar trajectory when the wake is scaled with ramp height.…”

Section: The Velocity Fieldmentioning

confidence: 99%

Micro Vortex Generators for Boundary Layer Control: Principles and Applications

Sun¹

2015

International Journal of Flow Control

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractA review is given to the major developments in the boundary layer control by means of micro vortex generator (MVG). The appearance of MVG dates back to about three decades from the present review and this class of device rapidly spreads as an efficient and robust boundary layer control strategy for flows with separation in particular. Substantial successful applications of MVG have been achieved in subsonic flows and its application into supersonic flow is under progressive development, which requires the current status and capability of MVG to be reviewed. The fundamental aspects of MVG are first summarized, including its working principle and various geometries. Understanding of the fluid mechanics involved in the wake of a MVG device is of uppermost importance: the timeaveraged and instantaneous wakes are discussed respectively. In the former, effects from the MVG geometry parameters are presented; while in the latter, focus is placed on the phenomenon associated with flow instability inside the wake. MVG's applications in the subsonic regime are discussed, which covers the fundamental flow separation investigations and studies to tackle several practical problems. The ongoing studies in supersonic regime dealing with shock wave boundary layer interaction (SWBLI) induced separation are reviewed later, where the presentation is organized according to different types of SWBLI with emphasis on the interaction region.

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Section: The Velocity Fieldmentioning

confidence: 99%

Micro Vortex Generators for Boundary Layer Control: Principles and Applications

Sun¹

2015

International Journal of Flow Control

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“…The momentum deficit was visualized and its decay was also observed. The experimental study of Nolan & Babinsky [10] using laser Doppler anemometry (LDA) characterized the micro-ramp wake in further detail, revealing the quasi-circular shear layer wrapping the conical wake and the upwash and downwash motions induced by primary streamwise vortices. Downstream of 30 ramp heights the weaker imprints of these structures suggested a fast decay rate of the MVG wake.…”

Section: Introductionmentioning

confidence: 99%

Decay of the supersonic turbulent wakes from micro-ramps

et al. 2014

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This is the accepted version of the paper.This version of the publication may differ from the final published version. The wakes resulting from micro-ramps immersed in a supersonic turbulent boundary layer at Ma=2.0 are investigated by means of particle image velocimetry (PIV). Two micro-ramps are investigated with height of 60% and 80% of the undisturbed boundary layer, respectively. The measurement domain is Permanent repository link

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“…Although the effects have been demonstrated through the foregoing studies, the flow physics of the microramp has not been fully understood due to the complex geometry of current device. Abundant efforts have been recently devoted to investigate the flow properties through both numerical [9][10][11][12] and experimental [13][14] methods. The major features including the momentum deficit and the primary vortex pair were originally visualized by Holden and Babinsky through wind tunnel experiments [5] .…”

Section: Introductionmentioning

confidence: 99%

LES investigation into the generation of momentum deficits in the supersonic wake of a micro-ramp

et al. 2014

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent AbstractThe implicitly implemented large eddy simulation (LES) with fifth order WENO scheme by solving the Naiver-Stokes equations was carried out to explore the origin of the momentum deficit caused by a supersonic micro-ramp at flow conditions of Ma=2.5 and Reθ=5760. The numerical results were validated by qualitative and quantitative comparisons with existing experimental data. After describing the aerodynamic properties of the supersonic wake, such as the deficit and the streamwise vortices, the momentum deficit was later detected to originate from the lower portion of the upstream boundary layer while the high momentum fluid near the wall from the upper portion. The position alternation trigged by the microramp was finally proposed as a revised mechanism.

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Characterization of Micro-Vortex Generators in Supersonic Flows

Cited by 22 publications

References 13 publications

Micro Vortex Generators for Boundary Layer Control: Principles and Applications

Micro Vortex Generators for Boundary Layer Control: Principles and Applications

Decay of the supersonic turbulent wakes from micro-ramps

LES investigation into the generation of momentum deficits in the supersonic wake of a micro-ramp

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