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Direct Numerical Simulation of turbulent nonpremixed “cool” flames: Applicability of flamelet models

Published on Jan 1, 2019
· DOI :10.1016/j.proci.2018.06.191
Alex G. Novoselov (Princeton University), Chung K. Law77
Estimated H-index: 77
(Princeton University),
Michael E. Mueller15
Estimated H-index: 15
(Princeton University)
Abstract
Abstract “Cool” flames result from the coupling of low-temperature chemistry with molecular transport. These flames have been experimentally and computationally observed under laminar flow conditions but have not been isolated under turbulent flow conditions. In this work, a skeletal n -heptane chemical mechanism including low-temperature chemistry is used to conduct two-dimensional Direct Numerical Simulations (DNS) of nonpremixed “cool” flames subjected to unsteady, two-dimensional flow initialized from a plane of isotropic turbulence. Like conventional “hot” flames, at high Damkohler numbers, these “cool” flames are found to be adequately described by a steady flamelet model. However, at low Damkohler numbers, both nonpremixed and premixed behavior is observed locally. When the combustion is locally nonpremixed, these “cool” flames can be described by the unsteady flamelet model only if the correct scalar dissipation rate profile and associated boundary conditions are considered.
  • References (18)
  • Citations (1)
References18
Newest
#1Sili Deng (Princeton University)H-Index: 6
#2Dong Han (Princeton University)H-Index: 11
Last.Chung K. Law (Princeton University)H-Index: 77
view all 3 authors...
#1Nicholas Burali (California Institute of Technology)H-Index: 1
#2Simon Lapointe (California Institute of Technology)H-Index: 6
Last.Yuan Xuan (PSU: Pennsylvania State University)H-Index: 8
view all 5 authors...
#1Peng Zhao (Princeton University)H-Index: 10
#2Wenkai Liang (Princeton University)H-Index: 8
Last.Chung K. Law (Princeton University)H-Index: 77
view all 4 authors...
#1Arne Scholtissek (Freiberg University of Mining and Technology)H-Index: 3
#2Wai Lee Chan (UM: University of Michigan)H-Index: 3
Last.C. Hasse (Freiberg University of Mining and Technology)H-Index: 23
view all 8 authors...
#1Sili Deng (Princeton University)H-Index: 6
#2Peng Zhao (Princeton University)H-Index: 10
Last.Chung K. Law (Princeton University)H-Index: 77
view all 4 authors...
#1Yuan Xuan (California Institute of Technology)H-Index: 8
#2Guillaume Blanquart (California Institute of Technology)H-Index: 21
Last.Michael E. Mueller (Princeton University)H-Index: 15
view all 3 authors...
#1Sang Hee Won (Princeton University)H-Index: 27
#2Bret C. Windom (Princeton University)H-Index: 10
Last.Yiguang Ju (Princeton University)H-Index: 54
view all 4 authors...
#1Vedha NayagamH-Index: 13
#2Daniel L. Dietrich (Glenn Research Center)H-Index: 13
Last.Forman A. Williams (UCSD: University of California, San Diego)H-Index: 48
view all 5 authors...
Cited By1
Newest
#1Yiguang Ju (Princeton University)H-Index: 54
#2Christopher B. Reuter (Princeton University)H-Index: 7
Last.Sang Hee Won (USC: University of South Carolina)H-Index: 3
view all 0 authors...
#1Yang Zhang (THU: Tsinghua University)H-Index: 11
#2Xiehe Yang (THU: Tsinghua University)
Last.Junfu Lyu (THU: Tsinghua University)H-Index: 3
view all 6 authors...
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