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Micro-Ramps for Hypersonic Flow Control

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Author(s): Mohd R. Saad | Hossein Zare-Behtash | Azam Che-Idris | Konstantinos Kontis

Journal: Micromachines
ISSN 2072-666X

Volume: 3;
Issue: 2;
Start page: 364;
Date: 2012;
Original page

Keywords: micro-ramp | micro-vortex-generator | shock-boundary layer interaction | hypersonic | flow control

ABSTRACT
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.
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