Results 261 to 270 of about 14,355 (292)

Numerical and Experimental Investigations of the Flow behind a Supersonic Micro-Ramp

51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2013
The flow past a micro-ramp immersed in a supersonic turbulent boundary layer was studied by means of experiments conducted with planar and tomographic PIV and numerical simulations with the implicit large eddy simulation (ILES) technique. The experimental data is mostly used to ascertain the validity of the numerical results. The time-averaged velocity
Zhengzhong Sun, Fulvio Scarano, Bas Van Oudheusden, Ferry Schrijer, Xiao Wang, Yonghua Yan, Chaoqun Liu   +6 more
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Micro-Ramp Control for Oblique Shock Wave / Boundary Layer Interactions

37th AIAA Fluid Dynamics Conference and Exhibit, 2007
Supersonic engine intakes operating supercritically feature shock wave / boundary layer interactions (SBLIs), which are conventionally controlled using boundary layer bleed. The momentum loss of bleed flow causes high drag, compromising intake performance. Micro-ramp sub-boundary layer vortex generators (SBVGs) have been proposed as an alternative form
Charles Pitt Ford, Holger Babinsky
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The Effect of Micro-ramps on Supersonic Flow over a Forward-Facing Step

Chinese Physics Letters, 2013
The effect of micro-ramp control on fully developed turbulent flow over a forward-facing step (FFS) is investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and supersonic particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and the average velocity profiles of
Qing-Hu Zhang, Shi-He Yi, Yang-Zhu Zhu, Zhi Chen, Yu Wu   +4 more
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Flow control of micro-ramps on supersonic forward-facing step flow

Chinese Physics B, 2016
The effects of the micro-ramps on supersonic turbulent flow over a forward-facing step (FFS) was experimentally investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and velocity fields of supersonic flow
Qing-Hu Zhang, Tao Zhu, Shihe Yi, Anping Wu   +3 more
openaire   +1 more source

Numerical Simulation of a Film-Cooling Flow with a Micro-ramp Vortex Generator

49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2011
A direct numerical simulation of an inclined turbulent jet interacting with a cross-flow in a film-cooling configuration is performed. The effect of including a micro-ramp vortex generator downstream of the film-cooling jet is studied. Specifically, changes in vortex structure and film-cooling effectiveness are evaluated. The coolant jet is inclined at
Aaron Shinn, S. Pratap Vanka
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Micro-Ramp Flow Control of Normal Shock/Boundary Layer Interactions

47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition, 2009
Boundary layer bleed has conventionally been used to control separation due to shock wave / boundary layer interactions (SBLIs) within supersonic engine inlets. However, bleed systems result in a loss of captured mass flow, incurring higher drag and ultimately lower propulsion system efficiency.
Thomas Herges, Erik Kroeker, Gregory Elliott, J Dutton   +3 more
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Understanding Micro-Ramp Control for Shock Boundary Layer Interactions

2008
Abstract : Micro-vortex generators (micro-VGs) have the ability to alter the near-wall structure of compressible turbulent boundary layers in such a way that the flow becomes significantly less susceptible to separations and more stable to unsteady disturbances.
Sang Lee, Eric Loth
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Micro-Ramps Flow Characteristics at Mach 1.9 & 5

2015
The prominent problem faced by the air-breathing propulsion system of supersonic aero-vehicles is the phenomenon known as shock wave- boundary layer interactions (SBLI) which cause boundary layer separation and adverse pressure ...
M. R. Saad, A. Che Idris, K. H. Lo, K. Kontis   +3 more
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Large Eddy Simulations of Film-Cooling Flows With a Micro-Ramp Vortex Generator

Volume 6: Fluids and Thermal Systems; Advances for Process Industries, Parts A and B, 2011
Large Eddy Simulations were performed to study the effect of a micro-ramp on an inclined turbulent jet interacting with a cross-flow in a film-cooling configuration. The micro-ramp vortex generator is placed downstream of the film-cooling jet. Changes in vortex structure and film-cooling effectiveness are evaluated and the genesis of the counter ...
Aaron F. Shinn, S. Pratap Vanka
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Linear and Non-Linear Dynamics of a Micro-ramp Wake

2019
Aerodynamics
Groot, K.J. (author), Casacuberta Puig, J. (author), Ye, Q. (author), Hickel, S. (author)   +3 more
openaire   +1 more source