Direct numerical simulation study of evaporation effects in combustion suppression by inert droplets
Direct numerical simulation study of evaporation effects in combustion suppression by inert droplets
Direct numerical simulation (DNS) is performed to investigate the evaporation effects of inert droplets on turbulent micromixing and combustion in a three-dimensional temporally-developing turbulent reacting mixing layer laden with more than 107 Lagrangian droplets/particles initiated in the fuel stream. Different characteristic evaporation times of droplets are obtained by varying the latent heat of vapourisation. Dilution and thermal cooling effects are then studied in the context of combustion suppression. Since the conventional mixture fraction for a two-scalar mixing and reactive system is inappropriate for a three-scalar (fuel, oxidiser and vapour) system as in the present study, the instantaneous local equivalence ratio is proposed instead to represent the mixture status. The evaporation effects on turbulent micromixing are studied using the conditionally averaged scalar dissipation rate, which consists of six components in the present three-scalar mixing problem. Thermal cooling and mixture dilution by vapour are found to have different influence on the six scalar dissipation rates.
turbulent micromixing, flame suppression, droplets, evaporation, dns
2581-2590
Xia, J.
ab23d6f5-1c9b-4f1e-8d6a-47606c9429d7
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
2011
Xia, J.
ab23d6f5-1c9b-4f1e-8d6a-47606c9429d7
Luo, K.H.
1c9be6c6-e956-4b12-af13-32ea855c69f3
Xia, J. and Luo, K.H.
(2011)
Direct numerical simulation study of evaporation effects in combustion suppression by inert droplets.
Proceedings of the Combustion Institute, 33 (2), .
(doi:10.1016/j.proci.2010.07.009).
Abstract
Direct numerical simulation (DNS) is performed to investigate the evaporation effects of inert droplets on turbulent micromixing and combustion in a three-dimensional temporally-developing turbulent reacting mixing layer laden with more than 107 Lagrangian droplets/particles initiated in the fuel stream. Different characteristic evaporation times of droplets are obtained by varying the latent heat of vapourisation. Dilution and thermal cooling effects are then studied in the context of combustion suppression. Since the conventional mixture fraction for a two-scalar mixing and reactive system is inappropriate for a three-scalar (fuel, oxidiser and vapour) system as in the present study, the instantaneous local equivalence ratio is proposed instead to represent the mixture status. The evaporation effects on turbulent micromixing are studied using the conditionally averaged scalar dissipation rate, which consists of six components in the present three-scalar mixing problem. Thermal cooling and mixture dilution by vapour are found to have different influence on the six scalar dissipation rates.
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Published date: 2011
Keywords:
turbulent micromixing, flame suppression, droplets, evaporation, dns
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Local EPrints ID: 184399
URI: http://eprints.soton.ac.uk/id/eprint/184399
ISSN: 1540-7489
PURE UUID: 175f0e67-6302-43d5-b40b-071a582e1223
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Date deposited: 05 May 2011 15:25
Last modified: 14 Mar 2024 03:07
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Author:
J. Xia
Author:
K.H. Luo
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