Thermal compression effects within a fundamental, hydrogen-fuelled scramjet

Vanyai, Tristan and Brieschenk, Stefan and Bricalli, Mathew and Sopek, Tamara and McIntyre, Timothy J. (2021) Thermal compression effects within a fundamental, hydrogen-fuelled scramjet. Aerospace Science and Technology, 110:106499. pp. 1-16. ISSN 1270-9638


The impact of thermal compression on combustion has been studied experimentally in a hydrogen-fuelled, non-uniform scramjet flowpath. The experimental model consisted of a three-dimensional inlet, a constant area rectangular combustor, and a single-ramp expansion nozzle, all having a constant width, and was tested at an equivalent Mach 10 flight condition with 58 kPa dynamic pressure. Combustion was suppressed in different regions of the combustor by injecting helium as a replacement for hydrogen fuel in either spanwise half of the engine. Thermal compression effects increased the combustion-induced pressure rise by across the majority of the combustor for an equivalence ratio of 0.8, however a shock-related artefact dominated similar measurements for a case with an equivalence ratio of 1.0. Over a smaller region at the end of the combustor, the combustion-induced pressure rise was increased by and for equivalence ratios of 0.8 and 1.0, respectively. Time-integrated OH emission signals increased by 19% and 31%, whilst time-resolved signals increased by 54% and 35%, for equivalence ratios of 0.8 and 1.0, respectively. This study presents the first experimental evidence of thermal compression directly increasing combustion-induced pressure rise in a scramjet engine.

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Item Type: Article (Commonwealth Reporting Category C)
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 02:57
Last Modified: 28 Jul 2022 03:36
Uncontrolled Keywords: Dynamic pressures; Equivalence ratios; Experimental evidence; Experimental modeling; Flight conditions; Hydrogen-fuelled; Scramjet engines; 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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