PDF modeling of turbulent nonpremixed CO/H2/N2 jet flames with reduced mechanisms

J. Y. Chen; Robert Dibble; R. W. Bilger

doi:10.1016/S0082-0784(06)80329-2

PDF modeling of turbulent nonpremixed CO/H₂/N₂ jet flames with reduced mechanisms

J. Y. Chen^*, Robert Dibble, R. W. Bilger

^*Corresponding author for this work

Physical Sciences and Engineering

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

13 Scopus citations

Abstract

A three-step reduced reaction mechanism for nonpremixed CO/H₂/N₂-air combustion is developed and applied to predicting turbulent jet flames. For Tsuji type laminar, non-premixed, opposed-flow flames, the reduced mechanism predicts reasonably good results compared to those from a parent mechanism. Application of the proposed reduced mechanism for predicting turbulent nonpremixed jet flames is carried out with a hybrid pdf-moment closure method. The performance of the pdf-moment closure method is evaluated by comparision of predictions with the experimental data by Masri and Dibble (1988). At high jet velocities, the model predicts bimodal joint statistics among the scalars demonstrating the capability of predicting local flame extinction. However, the experimental data indicates no occurrence of local flame extinction. Besides possible experimental uncertainty, the effects of pilot flame and differential diffusion are plausible reasons for the discrepancy.

Original language	English (US)
Pages (from-to)	775-780
Number of pages	6
Journal	Symposium (International) on Combustion
Volume	23
Issue number	1
DOIs	https://doi.org/10.1016/S0082-0784(06)80329-2
State	Published - Jan 1 1991

ASJC Scopus subject areas

Chemical Engineering(all)
Fuel Technology
Energy Engineering and Power Technology
Mechanical Engineering
Fluid Flow and Transfer Processes
Physical and Theoretical Chemistry

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abstract = "A three-step reduced reaction mechanism for nonpremixed CO/H2/N2-air combustion is developed and applied to predicting turbulent jet flames. For Tsuji type laminar, non-premixed, opposed-flow flames, the reduced mechanism predicts reasonably good results compared to those from a parent mechanism. Application of the proposed reduced mechanism for predicting turbulent nonpremixed jet flames is carried out with a hybrid pdf-moment closure method. The performance of the pdf-moment closure method is evaluated by comparision of predictions with the experimental data by Masri and Dibble (1988). At high jet velocities, the model predicts bimodal joint statistics among the scalars demonstrating the capability of predicting local flame extinction. However, the experimental data indicates no occurrence of local flame extinction. Besides possible experimental uncertainty, the effects of pilot flame and differential diffusion are plausible reasons for the discrepancy.",

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AU - Dibble, Robert

AU - Bilger, R. W.

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AB - A three-step reduced reaction mechanism for nonpremixed CO/H2/N2-air combustion is developed and applied to predicting turbulent jet flames. For Tsuji type laminar, non-premixed, opposed-flow flames, the reduced mechanism predicts reasonably good results compared to those from a parent mechanism. Application of the proposed reduced mechanism for predicting turbulent nonpremixed jet flames is carried out with a hybrid pdf-moment closure method. The performance of the pdf-moment closure method is evaluated by comparision of predictions with the experimental data by Masri and Dibble (1988). At high jet velocities, the model predicts bimodal joint statistics among the scalars demonstrating the capability of predicting local flame extinction. However, the experimental data indicates no occurrence of local flame extinction. Besides possible experimental uncertainty, the effects of pilot flame and differential diffusion are plausible reasons for the discrepancy.

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PDF modeling of turbulent nonpremixed CO/H₂/N₂ jet flames with reduced mechanisms

Abstract

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