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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5082

Title: Dynamic effects on the transition between two-dimensional regular and Mach reflection of shock waves in an ideal, steady supersonic free stream
Authors: Naidoo, K
Skews, BW
Keywords: Dynamic shock wave reflection
Dynamic transition
Dynamic mach stem
Rapid wedge rotation
Issue Date: Jun-2011
Publisher: Cambridge University Press
Citation: Naidoo, K, and Skews, BW. 2011. Dynamic effects on the transition between two-dimensional regular and Mach reflection of shock waves in an ideal, steady supersonic free stream. Journal of Fluid Mechanics, Vol. 676, pp. 432-460
Series/Report no.: Workflow;6740
Abstract: There have been numerous studies on the steady state transition criteria between regular and Mach reflection of shock waves generated by a stationary, two-dimensional wedge in a steady supersonic flow, since the original shock wave reflection research by Ernst Mach in 1878. The steady, two-dimensional transition criteria between regular and Mach reflection are well established. There has been little done to consider the dynamic effect of a rapidly rotating wedge on the transition between regular andMach reflection. This paper presents the results of an investigation on the effect of rapid wedge rotation on regular to Mach reflection transition in the weak and strong-reflection ranges, with the aid of experiment and computational fluid dynamics. The experimental setup includes a novel facility to rotate a pair of large aspect ratio wedges in a 450 mm × 450 mm supersonic wind tunnel at wedge rotation speeds up to 11000 deg/s. High-speed images and measurements are presented. Numerical solution of the inviscid governing flow equations was used to mimic the experimental motion and to extend the investigation beyond the limits of the current facility to explore the influence of variables in the parameter space. There is good agreement between experiment and numerical simulation. This paper includes the first experimental evidence of regular to Mach reflection transition beyond the steady state detachment condition in the weak and strong-reflection ranges. It also presents results of simulations for dynamic regular to Mach reflection transition which show a difference between the sonic, length scale and detachment conditions. This paper includes experimental evidence of Mach to regular reflection transition below the steady state von Neumann condition.
Description: Copyright: 2011 Cambridge University Press. This is a post print version of the work. The definitive version is published in the Journal of Fluid Mechanics, Vol. 676, pp. 432-460
URI: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8278626
http://hdl.handle.net/10204/5082
ISSN: 0022-1120
Appears in Collections:Aeronautic systems
General science, engineering & technology

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