Large Eddy Simulation of High-Speed, Premixed Ethylene Combustion

Ramesh, K. , Edwards, J. R., Chelliah, H., Goyne, C., McDaniel, J., Rockwell, R., Kirik, J., Cutler, A. and Danehy, P. (2015) Large Eddy Simulation of High-Speed, Premixed Ethylene Combustion. In: 53rd AIAA Aerospace Sciences Meeting, Kissimmee, FL, USA, 5-9 Jan 2015, (doi:10.2514/6.2015-0356)

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Abstract

A large-eddy simulation / Reynolds-averaged Navier-Stokes (LES/RANS) methodology is used to simulate premixed ethylene-air combustion in a model scramjet designed for dual mode operation and equipped with a cavity for flameholding. A 22-species reduced mechanism for ethylene-air combustion is employed, and the calculations are performed on a mesh containing 93 million cells. Fuel plumes injected at the isolator entrance are processed by the isolator shock train, yielding a premixed fuel-air mixture at an equivalence ratio of 0.42 at the cavity entrance plane. A premixed flame is anchored within the cavity and propagates toward the opposite wall. Near complete combustion of ethylene is obtained. The combustor is highly dynamic, exhibiting a large-scale oscillation in global heat release and mass flow rate with a period of about 2.8 ms. Maximum heat release occurs when the flame front reaches its most downstream extent, as the flame surface area is larger. Minimum heat release is associated with flame propagation toward the cavity and occurs through a reduction in core flow velocity that is correlated with an upstream movement of the shock train. Reasonable agreement between simulation results and available wall pressure, particle image velocimetry, and OH-PLIF data is obtained, but it is not yet clear whether the system-level oscillations seen in the calculations are actually present in the experiment.

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ramesh, Dr Kiran
Authors: Ramesh, K., Edwards, J. R., Chelliah, H., Goyne, C., McDaniel, J., Rockwell, R., Kirik, J., Cutler, A., and Danehy, P.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Copyright Holders:Copyright © 2015 Jack R. Edwards
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.
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