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Application of the Evolution-Variable Manifold Approach to Cavity-Stabilized Ethylene Combustion

Cymbalist, Niccolo and Candler, Graham V. and Dimotakis, Paul E. (2016) Application of the Evolution-Variable Manifold Approach to Cavity-Stabilized Ethylene Combustion. In: 46th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics (AIAA) , Reston, VA, Paper No.AIAA-2016-3481. ISBN 9781624104367.

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For combustion in high-speed flows, radical-formation time scales and ignition delay times may be similar to, or dominate, relevant flow time scales. Reliable modeling of induction and autoignition processes is critical to the prediction of combustor performance. The evolution-variable manifold (EVM) approach of Cymbalist and Dimotakis uses a transported scalar to track the evolution of the reaction processes, from induction leading to autoignition and subsequent robust combustion. In the present work, the EVM method is implemented in a computational fluid dynamics code in which wall-modeled large-eddy simulations are performed for two ethylene-air high-speed combustion cases. The detailed thermochemical state of the reacting fluid is tabulated as a function of a reduced number of state variables that include density, energy, mixture fraction, and the reaction-evolution variable. A thermodynamically consistent numerical flux function is developed and the approach for coupling the large-eddy simulation to the EVM framework is discussed. It is found that particular attention must be given to the solution of the energy equation to obtain accurate and computationally stable results. The results show that the LES-EVM approach shows promise for the simulation of turbulent combustion of hydrocarbons in high-speed flows, including those dominated by ignition delay, and encompass regions of thin reaction fronts as well as distributed reaction zones.

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Additional Information:© 2016 AIAA. This work was sponsored by the Air Force Office of Scientific Research under grant FA9550-12-1-0461. The views and conclusions contained herein are those of the author and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the AFOSR or the U.S. Government. We would also like to thank Prof. Mirko Gamba of the University of Michigan for providing the code to compute the synthetic OH PLIF signal plots (Fig. 7), Drs. Matthew Bartkowicz and Travis Drayna of GoHypersonic Inc. for generating the grids used in this work, and Mr. Anand Kartha of the University of Minnesota for providing synthetic turbulent in ow code used for the University of Virginia simulations.
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Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0461
Record Number:CaltechAUTHORS:20160915-105801877
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Official Citation: Niccolo Cymbalist, Graham V. Candler, and Paul Dimotakis. "Application of the Evolution-Variable Manifold Approach to Cavity-Stabilized Ethylene Combustion", 46th AIAA Fluid Dynamics Conference, AIAA Aviation, (AIAA 2016-3481)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:70373
Deposited By: Kristin Buxton
Deposited On:15 Sep 2016 19:10
Last Modified:11 Nov 2021 04:28

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