An experimental investigation of a thermal compression scramjet with OH imaging

Vanyai, Tristan , Bricalli, Mathew , Sopek, Tamara , Brieschenk, Stefan , McIntyre, Timothy J. and Boyce, Russell (2015). An experimental investigation of a thermal compression scramjet with OH imaging. In: 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015. 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, Glasgow, Scotland, (). 6-9 July 2015. doi:10.2514/6.2015-3610


Author Vanyai, Tristan
Bricalli, Mathew
Sopek, Tamara
Brieschenk, Stefan
McIntyre, Timothy J.
Boyce, Russell
Title of paper An experimental investigation of a thermal compression scramjet with OH imaging
Conference name 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference
Conference location Glasgow, Scotland
Conference dates 6-9 July 2015
Proceedings title 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, 2015
Place of Publication Reston, VA, United States
Publisher American Institute of Aeronautics and Astronautics
Publication Year 2015
Sub-type Fully published paper
DOI 10.2514/6.2015-3610
Open Access Status Not yet assessed
ISBN 9781624103209
Total pages 12
Language eng
Abstract/Summary Scramjet engines must be designed to operate over a range of Mach numbers. In order to maintain robust starting characteristics at low freestream Mach numbers, the inlet contraction ratio must be minimized, reducing performance at high Mach numbers. The technique of thermal compression can be used to maintain robust combustion at low mean pressure and temperature, improving the performance of low inlet contraction ratio engines over a range of Mach numbers. This paper examines a scramjet engine with a threedimensional inlet that induces spanwise gradients of pressure and temperature, producing high inlet compression on one side and low inlet compression on the other. The effect of combustion in each half on pressure throughout the entire flowfield is examined by suppressing combustion on either half of the combustor through injecting either a combusting fuel, hydrogen, or a non-combusting replacement, helium. Two optical techniques are used to examine how the concentration of the OH radical varies throughout the combustor. Images of OH* Chemiluminescence and OH Planar Laser-Induced Fluorescence (PLIF) map the concentration and production of OH radicals indicating chemical activity throughout the combustion process. The thermal compression effect is isolated, and is shown to increase combustion-induced pressure rise in a scramjet engine.
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Mon, 29 May 2017, 14:08:29 EST by Tristan Vanyai on behalf of School of Mechanical and Mining Engineering