The Effect of Micro-ramps on Supersonic Flow over a Forward-Facing Step

doi:10.1088/0256-307X/30/4/044701

Chin. Phys. Lett.

2013, Vol. 30

Issue (4): 044701 DOI: 10.1088/0256-307X/30/4/044701

FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS)

The Effect of Micro-ramps on Supersonic Flow over a Forward-Facing Step

ZHANG Qing-Hu, YI Shi-He^**, ZHU Yang-Zhu, CHEN Zhi, WU Yu

College of Aerospace Science and Technology, National University of Defense Technology, Changsha 410073

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ZHANG Qing-Hu, YI Shi-He, ZHU Yang-Zhu et al 2013 Chin. Phys. Lett. 30 044701

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Abstract 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 supersonic flow over the FFS with and without the control of the micro-ramps are captured. The fine structures of both cases, including the coherent structures of fully developed boundary layer and the large-scale hairpin-like vortices originated from the micro-ramps as well as the interaction of shock waves with the large-scale structures, are revealed and compared. Based on the time-correlation images, the temporal and spatial evolutionary characteristics of the coherent structures are investigated. It is beneficial to understand the dynamic mechanisms of the separated flow and the control mechanisms of the micro-ramps. The size of the separation region is determined by the NPLS and PIV. The results indicate that the control of the micro-ramps is capable of delaying the separation and diminishing the extent of recirculation zone.

Received: 20 November 2012 Published: 28 April 2013

PACS:	47.80.Jk	(Flow visualization and imaging)
	47.32.Ff	(Separated flows)
	47.85.L-	(Flow control)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/30/4/044701 OR https://cpl.iphy.ac.cn/Y2013/V30/I4/044701

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	ZHANG Qing-Hu
	YI Shi-He
	ZHU Yang-Zhu
	CHEN Zhi
	WU Yu

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