Second-order closure for turbulent nonpremixed flames: scalar dissipation and heat release effects

R. W. Dibble; W. kollman; M. Farshchi; R. W. Schefer

doi:10.1016/S0082-0784(88)80364-3

Second-order closure for turbulent nonpremixed flames: scalar dissipation and heat release effects

R. W. Dibble^*, W. kollman, M. Farshchi, R. W. Schefer

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A second-order closure model for reacting turbulent flows is presented and evaluated by comparing the results with measurements in a turbulent nonpremixed flame. In particular, a model for the Reynolds stress components, which specifically includes the effects of chemical heat release on the Reynolds stress components, is put forward. Predictions with this new closure are in agreement with the present experimental data. The analysis shows that the heat release terms are of importance for the time-scale ratio. The time-scale ratio is not constant and is sensitive to density fluctuations. Accordingly, the heat release due to combustion affects the scalar field differently than the velocity field.

Original language	English (US)
Pages (from-to)	1329-1340
Number of pages	12
Journal	Symposium (International) on Combustion
Volume	21
Issue number	1
DOIs	https://doi.org/10.1016/S0082-0784(88)80364-3
State	Published - 1988
Externally published	Yes

ASJC Scopus subject areas

General Chemical Engineering
Fuel Technology
Energy Engineering and Power Technology
Mechanical Engineering
Physical and Theoretical Chemistry
Fluid Flow and Transfer Processes

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abstract = "A second-order closure model for reacting turbulent flows is presented and evaluated by comparing the results with measurements in a turbulent nonpremixed flame. In particular, a model for the Reynolds stress components, which specifically includes the effects of chemical heat release on the Reynolds stress components, is put forward. Predictions with this new closure are in agreement with the present experimental data. The analysis shows that the heat release terms are of importance for the time-scale ratio. The time-scale ratio is not constant and is sensitive to density fluctuations. Accordingly, the heat release due to combustion affects the scalar field differently than the velocity field.",

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AU - Dibble, R. W.

AU - kollman, W.

AU - Farshchi, M.

AU - Schefer, R. W.

PY - 1988

Y1 - 1988

N2 - A second-order closure model for reacting turbulent flows is presented and evaluated by comparing the results with measurements in a turbulent nonpremixed flame. In particular, a model for the Reynolds stress components, which specifically includes the effects of chemical heat release on the Reynolds stress components, is put forward. Predictions with this new closure are in agreement with the present experimental data. The analysis shows that the heat release terms are of importance for the time-scale ratio. The time-scale ratio is not constant and is sensitive to density fluctuations. Accordingly, the heat release due to combustion affects the scalar field differently than the velocity field.

AB - A second-order closure model for reacting turbulent flows is presented and evaluated by comparing the results with measurements in a turbulent nonpremixed flame. In particular, a model for the Reynolds stress components, which specifically includes the effects of chemical heat release on the Reynolds stress components, is put forward. Predictions with this new closure are in agreement with the present experimental data. The analysis shows that the heat release terms are of importance for the time-scale ratio. The time-scale ratio is not constant and is sensitive to density fluctuations. Accordingly, the heat release due to combustion affects the scalar field differently than the velocity field.

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JF - Symposium (International) on Combustion

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ER -

Second-order closure for turbulent nonpremixed flames: scalar dissipation and heat release effects

Abstract

ASJC Scopus subject areas

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