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International Journal of Aerospace Engineering
Volume 2015, Article ID 504684, 10 pages
http://dx.doi.org/10.1155/2015/504684
Research Article

Study on the Effect of Air Throttling on Flame Stabilization of an Ethylene Fueled Scramjet Combustor

Science and Technology on Scramjet Laboratory, Hypervelocity Aerodynamics Institute of CARDC, Sichuan, Mianyang 621000, China

Received 10 April 2015; Accepted 26 August 2015

Academic Editor: Hui Hu

Copyright © 2015 Ye Tian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of air throttling on flame stabilization of an ethylene fueled scramjet combustor was investigated by numerical simulation and experiments in this paper. The results were obtained under the inflow condition with Mach number of 2.0, total temperature of 900 K, total pressure of 0.8 MPa, and total equivalence ratio of 0.5. The shock train generated by air throttling had a big effect on the flow structure of the scramjet combustor. Compared with the combustor without air throttling, the flow field with air throttling had a lower velocity and higher pressure, temperature, and vortices intensity. Air throttling was an effective way to achieve flame stabilization; the combustion in the combustor without air throttling was nearly blowout. In the experiment, the combustion was nearly blowout with air throttling location of 745 mm, and the fuel/air mixture in the combustor with air throttling location of 875 mm was burned intensively. It was important to choose the location and time sequence of air throttling for fuel ignition and flame stabilization. The numerical simulation results agreed well with experimental measurements.