Abstract
A miniature supersonic burner has been designed with the purpose of studying extreme flow-chemistry interaction. The system combines a first-stage, a lean premixed methane/air burner that creates a vitiated flow at elevated pressure, and a second stage where additional fuel (methane) is added into the flow before exiting the system through a converging nozzle. At the system exit, a sonic underexpanded jet is created where very short characteristic fluid time scales obtain. These are comparable to the fastest chemical reaction time scales, thus creating a situation where the flow interacts with the chemistry and suppresses combustion. In this paper, reduced-chemistry three-dimensional computational fluid dynamics is used to understand the reacting flow in the system and predict flame holding, while vibrational Raman line-imaging spectroscopy is used—qualitatively—at the burner exit. Experiments and computations point to a clear bimodal behavior of the system: in one extreme, where an attached non-premixed flame is created in the burner; in the other extreme, where no reaction is taking place in the second stage and all additional fuel is left unburnt.
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Acknowledgments
NSF support through Grant No. 0933633 (Song-Charng Kong, program director) is gratefully acknowledged. D. W. Ellis acknowledges a ConocoPhillips fellowship through the auspices of the Texas A&M Energy Institute; A. C. Bayeh acknowledges a National Defense Science and Engineering Graduate fellowship. The support of the Texas A&M High Performance Research Computing Laboratory through supercomputer grants was instrumental in the completion of the present work.
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Published In
Journal of Energy Engineering
Volume 144 • Issue 5 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Feb 13, 2018
Accepted: May 8, 2018
Published online: Aug 10, 2018
Published in print: Oct 1, 2018
Discussion open until: Jan 10, 2019
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