Abstract
The influence of the relations between the chemical time scale and the turbulent time scale on local extinction in turbulent flames has been studied. The results from the numerical investigation of a non-swirling flame in a sudden-expansion combustor was compared with measurements and computations reported in the literature. The turbulence-chemistry interaction was modelled using the Eddy-Dissipation Concept (EDC). In the study, different turbulent time scales were used; the Kolmogorov related time scale proposed in the EDC model and two turbulent time scales related to k/{epsilon}. The chemical time scale has been obtained from a model based on calculations with a comprehensive chemical reaction scheme. The results indicate that the Kolmogorov related time scale of the EDC model is too short to be used as an extinction criterium. The two k/{epsilon} related time scales both resulted in a closer agreement between the numerically obtained and the measured results. The result indicates that the time scale used in the EDC model should be further investigated before confident results from modelling of flows with extinction effects can be obtained. (author)
Brink, A;
Kilpinen, P;
Hupa, M;
[1]
Kjaeldman, L;
[2]
Jaeaeskelaeinen, K
[3]
- Aabo Akademi, Turku (Finland)
- VTT Energy, Espoo (Finland)
- Imatran Voima Oy, Helsinki (Finland)
Citation Formats
Brink, A, Kilpinen, P, Hupa, M, Kjaeldman, L, and Jaeaeskelaeinen, K.
Modelling of local extinction and reignition of the flame.
Finland: N. p.,
1996.
Web.
Brink, A, Kilpinen, P, Hupa, M, Kjaeldman, L, & Jaeaeskelaeinen, K.
Modelling of local extinction and reignition of the flame.
Finland.
Brink, A, Kilpinen, P, Hupa, M, Kjaeldman, L, and Jaeaeskelaeinen, K.
1996.
"Modelling of local extinction and reignition of the flame."
Finland.
@misc{etde_464560,
title = {Modelling of local extinction and reignition of the flame}
author = {Brink, A, Kilpinen, P, Hupa, M, Kjaeldman, L, and Jaeaeskelaeinen, K}
abstractNote = {The influence of the relations between the chemical time scale and the turbulent time scale on local extinction in turbulent flames has been studied. The results from the numerical investigation of a non-swirling flame in a sudden-expansion combustor was compared with measurements and computations reported in the literature. The turbulence-chemistry interaction was modelled using the Eddy-Dissipation Concept (EDC). In the study, different turbulent time scales were used; the Kolmogorov related time scale proposed in the EDC model and two turbulent time scales related to k/{epsilon}. The chemical time scale has been obtained from a model based on calculations with a comprehensive chemical reaction scheme. The results indicate that the Kolmogorov related time scale of the EDC model is too short to be used as an extinction criterium. The two k/{epsilon} related time scales both resulted in a closer agreement between the numerically obtained and the measured results. The result indicates that the time scale used in the EDC model should be further investigated before confident results from modelling of flows with extinction effects can be obtained. (author)}
place = {Finland}
year = {1996}
month = {Dec}
}
title = {Modelling of local extinction and reignition of the flame}
author = {Brink, A, Kilpinen, P, Hupa, M, Kjaeldman, L, and Jaeaeskelaeinen, K}
abstractNote = {The influence of the relations between the chemical time scale and the turbulent time scale on local extinction in turbulent flames has been studied. The results from the numerical investigation of a non-swirling flame in a sudden-expansion combustor was compared with measurements and computations reported in the literature. The turbulence-chemistry interaction was modelled using the Eddy-Dissipation Concept (EDC). In the study, different turbulent time scales were used; the Kolmogorov related time scale proposed in the EDC model and two turbulent time scales related to k/{epsilon}. The chemical time scale has been obtained from a model based on calculations with a comprehensive chemical reaction scheme. The results indicate that the Kolmogorov related time scale of the EDC model is too short to be used as an extinction criterium. The two k/{epsilon} related time scales both resulted in a closer agreement between the numerically obtained and the measured results. The result indicates that the time scale used in the EDC model should be further investigated before confident results from modelling of flows with extinction effects can be obtained. (author)}
place = {Finland}
year = {1996}
month = {Dec}
}