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Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals

Hunger, F. and Zulkifli, M. F. and Williams, B. A. O. and Beyrau, F. and Hasse, C. (2017):
Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals.
In: Proceedings of the Combustion Institute, Elsevier, pp. 1713 - 1720, 36, (2), ISSN 1540-7489, DOI: 10.1016/j.proci.2016.06.183, [Online-Edition: http://dx.doi.org/10.1016/j.proci.2016.06.183],
[Article]

Abstract

Abstract The structure and characteristics of a turbulent inverse and normal oxy-fuel diffusion flame are investigated. Previous investigations reported in the literature looked at flame characteristics of laminar inverse diffusion flames and their differences to normal diffusion flames. Only few investigations are reported for turbulent inverse diffusion flames and they did not compare the results to the corresponding normal configuration. The present study uses a combined experimental and numerical approach to compare and analyze a turbulent non-premixed inverse oxy-fuel and a corresponding normal flame, both are non-piloted. Measurements were conducted using simultaneously recorded planar Rayleigh scattering and OH-LIF signals. Due to the significant variation of the effective Rayleigh cross section in mixture fraction space and the unknown {OH} quenching contributions, a comparison of derived quantities such as temperature and {OH} mole fraction is not possible. Therefore, the Rayleigh and OH-LIF signals were incorporated in the {LES} flamelet/progress variable approach used here. This allows for a direct comparison of experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals for the flame structure analysis, which includes the joint {PDF} of both quantities. The two flames are compared in terms of the local flame structure. In addition, differences in the mixing field and especially in the location of turbulent/non-turbulent interface are investigated.

Item Type: Article
Erschienen: 2017
Creators: Hunger, F. and Zulkifli, M. F. and Williams, B. A. O. and Beyrau, F. and Hasse, C.
Title: Comparative flame structure investigation of normal and inverse turbulent non-premixed oxy-fuel flames using experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals
Language: English
Abstract:

Abstract The structure and characteristics of a turbulent inverse and normal oxy-fuel diffusion flame are investigated. Previous investigations reported in the literature looked at flame characteristics of laminar inverse diffusion flames and their differences to normal diffusion flames. Only few investigations are reported for turbulent inverse diffusion flames and they did not compare the results to the corresponding normal configuration. The present study uses a combined experimental and numerical approach to compare and analyze a turbulent non-premixed inverse oxy-fuel and a corresponding normal flame, both are non-piloted. Measurements were conducted using simultaneously recorded planar Rayleigh scattering and OH-LIF signals. Due to the significant variation of the effective Rayleigh cross section in mixture fraction space and the unknown {OH} quenching contributions, a comparison of derived quantities such as temperature and {OH} mole fraction is not possible. Therefore, the Rayleigh and OH-LIF signals were incorporated in the {LES} flamelet/progress variable approach used here. This allows for a direct comparison of experimentally recorded and numerically predicted Rayleigh and OH-PLIF signals for the flame structure analysis, which includes the joint {PDF} of both quantities. The two flames are compared in terms of the local flame structure. In addition, differences in the mixing field and especially in the location of turbulent/non-turbulent interface are investigated.

Journal or Publication Title: Proceedings of the Combustion Institute
Volume: 36
Number: 2
Publisher: Elsevier
Uncontrolled Keywords: Rayleigh scattering, OH-PLIF, Oxy-fuel, Inverse diffusion flame, Large eddy simulation
Divisions: 16 Department of Mechanical Engineering > Simulation of reactive Thermo-Fluid Systems (STFS)
16 Department of Mechanical Engineering
Date Deposited: 16 Nov 2017 12:39
DOI: 10.1016/j.proci.2016.06.183
Official URL: http://dx.doi.org/10.1016/j.proci.2016.06.183
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