Effects of oxygen enrichment on scramjet performance

Petty, David J., Wheatley, Vincent, Smart, Michael K. and Razzaqi, Sarah A. (2013) Effects of oxygen enrichment on scramjet performance. AIAA Journal, 51 1: 226-235. doi:10.2514/1.J051732


Author Petty, David J.
Wheatley, Vincent
Smart, Michael K.
Razzaqi, Sarah A.
Title Effects of oxygen enrichment on scramjet performance
Journal name AIAA Journal   Check publisher's open access policy
ISSN 0001-1452
1533-385X
Publication date 2013-01-01
Year available 2012
Sub-type Article (original research)
DOI 10.2514/1.J051732
Volume 51
Issue 1
Start page 226
End page 235
Total pages 10
Place of publication Reston, VA, United States
Publisher American Institute of Aeronautics and Astronautics
Language eng
Abstract This investigation quantifies the beneficial effects of oxygen enrichment on the combustion efficiency and specific thrust of a simplified planar scramjet engine fueled with gaseous hydrogen. Numerical modeling was used to examine the influence of fuel equivalence ratio and enrichment percentage. Broad agreement with experimental data is reported, but the present simulations provide considerably more detail, revealing aspects of the flow physics that could not be discerned from experimental data. Multiple Reynolds-averaged Navier–Stokes simulations were performed at Mach 12 equivalent freestream conditions with fuel equivalence ratios of 0.8–1.4 and enrichment percentages up to 20%. Trends in combustion efficiency with enrichment percentage are formulated for use in trajectory studies. The combustion efficiency and specific thrust are found to be significantly increased by enriching fuel with oxygen. The increases are greater than those expected from the additional propellant and complete consumption of premixed oxygen. We found that this is due to oxygen enrichment modifying the mixing layer properties within the scramjet such that the production of turbulence and therefore fuel/air mixing is increased. It is also shown that an optimal combustor length exists beyond which internal losses outweigh contributions from combustion.
Keyword Oxygen enrichment
Combustion efficiency
Specific thrust
Gaseous hydrogen
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 22 November 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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Created: Wed, 06 Feb 2013, 22:27:22 EST by Ms Sarah Razzaqi on behalf of School of Mechanical and Mining Engineering