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Micromachines 2012, 3(2), 364-378; doi:10.3390/mi3020364

Micro-Ramps for Hypersonic Flow Control

1 Faculty of Engineering, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur 57000, Malaysia 2 School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK
* Author to whom correspondence should be addressed.
Received: 3 March 2012 / Revised: 27 March 2012 / Accepted: 19 April 2012 / Published: 26 April 2012
(This article belongs to the Special Issue Micro Flow Controllers)
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Shock/boundary layer interaction (SBLI) is an undesirable phenomenon, occurring in high-speed propulsion systems. The conventional method to manipulate and control SBLI is using a bleed system that involves the removal of a certain amount of mass of the inlet flow to control boundary layer separation. However, the system requires a larger nacelle to compensate the mass loss, larger nacelles contribute to additional weight and drag and reduce the overall performance. This study investigates a novel type of flow control device called micro-ramps, a part of the micro vortex generators (VGs) family that intends to replace the bleed technique. Micro-ramps produce pairs of counter-rotating streamwise vortices, which help to suppress SBLI and reduce the chances of flow separation. Experiments were done at Mach 5 with two micro-ramp models of different sizes. Schlieren photography, surface flow visualization and infrared thermography were used in this investigation. The results revealed the detailed flow characteristics of the micro-ramp, such as the primary and secondary vortices. This helps us to understand the overall flow physics of micro-ramps in hypersonic flow and their application for SBLI control.
Keywords: micro-ramp; micro-vortex-generator; shock-boundary layer interaction; hypersonic; flow control micro-ramp; micro-vortex-generator; shock-boundary layer interaction; hypersonic; flow control
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Saad, M.R.; Zare-Behtash, H.; Che-Idris, A.; Kontis, K. Micro-Ramps for Hypersonic Flow Control. Micromachines 2012, 3, 364-378.

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