Unsteady deflagration speed of an auto-ignitive dimethyl-ether (DME)/air mixture at stratified conditions

Desai, Swapnil; Sankaran, Ramanan; Im, Hong G.

doi:10.1016/j.proci.2018.09.019

Title: Unsteady deflagration speed of an auto-ignitive dimethyl-ether (DME)/air mixture at stratified conditions

Journal Article · Tue Jan 01 00:00:00 EST 2019 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2018.09.019· OSTI ID:1565736

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Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education
Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research and Graduate Education; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
King Abdullah Univ. of Science and Technology, Thuwal (Saudi Arabia). Clean Combustion Research Center

The propagation speed of an auto-ignitive dimethyl-ether (DME)/air mixture at elevated pressures and subjected to monochromatic temperature oscillations is numerically evaluated in a one-dimensional statistically stationary configuration using fully resolved numerical simulations with reduced kinetics and transport. Two sets of conditions with temperatures within and slightly above the negative temperature coefficient (NTC) regime are simulated to investigate the fundamental aspects of auto-ignition and flame propagation along with the transition from auto-ignitive deflagration to spontaneous propagation regimes under thermal stratification. Contrary to the standard laminar flame speed, the steady propagation speed of an auto-ignitive front is observed to scale proportionally to its level of upstream reactivity. It is shown that this interdependence is primarily influenced by the characteristic residence time and the homogeneous auto-ignition delay. Furthermore, the unsteady reaction front in either of the two cases responds distinctly to the imposed stratification. Specifically, the results in both cases show that the dynamic flame response depends on the mean temperature at the flame base Tb and the time-scale of thermal stratification. It is also found that, based on Tb and the propensity of the mixture to two-stage chemistry, the instantaneous peak propagation speed and the overall time taken to achieve that speed differs considerably. A displacement speed analysis is carried out to elucidate the underlying combustion modes that are responsible for such a variation in flame response.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); UT-Battelle LLC/ORNL, Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1565736

Journal Information:: Proceedings of the Combustion Institute, Vol. 37, Issue 4; ISSN 1540-7489

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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Cited By (3)

On the ambiguity of premixed flame thickness definition of highly pre-heated mixtures and its implication on turbulent combustion regimes Rauch, Andreas H.; Chelliah, Harsha K. Combustion Theory and Modelling, Vol. 24, Issue 4 https://doi.org/10.1080/13647830.2020.1722857	journal	February 2020
Numerical studies on autoignition and detonation development from a hot spot in hydrogen/air mixtures Gao, Yuan; Dai, Peng; Chen, Zheng Combustion Theory and Modelling, Vol. 24, Issue 2 https://doi.org/10.1080/13647830.2019.1674923	journal	October 2019
On the ambiguity of premixed flame thickness definition of highly pre-heated mixtures and its implication on turbulent combustion regimes Rauch, Andreas H.; Chelliah, Harsha K. Taylor & Francis https://doi.org/10.6084/m9.figshare.11821389.v2	text	January 2020

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