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Micromachines 2012, 3(2), 364-378;

Micro-Ramps for Hypersonic Flow Control

Faculty of Engineering, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur 57000, Malaysia
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. View Full-Text
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

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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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