An Experimental Investigation of a Thermal Compression Scramjet with OH Imaging

Vanyai, Tristan and Bricalli, Mathew and Sopek, Tamara ORCID: and Brieschenk, Stefan and McIntyre, Timothy J. (2015) An Experimental Investigation of a Thermal Compression Scramjet with OH Imaging. In: 20th AIAA International Space Planes and Hypersonic Systems and Technologies Conference (AIAA 2015), 6 July - 9 July 2015, Glasgow, Scotland.


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 three-dimensional 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.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 28 Jul 2022 02:30
Last Modified: 28 Jul 2022 02:30
Uncontrolled Keywords: Chemical activities; Combustion pro-cess; Experimental investigations; Freestream mach number; Oh planar laser induced fluorescences; Pressure and temperature; Starting characteristic; Thermal compressions
Fields of Research (2020): 40 ENGINEERING > 4001 Aerospace engineering > 400106 Hypersonic propulsion and hypersonic aerothermodynamics
51 PHYSICAL SCIENCES > 5102 Atomic, molecular and optical physics > 510299 Atomic, molecular and optical physics not elsewhere classified
40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401205 Experimental methods in fluid flow, heat and mass transfer
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