Journal article
Combustion Efficiencies of Supersonic Flames
Journal of propulsion and power, Vol.17(2), pp.301-307
03/2001
DOI: 10.2514/2.5742
Abstract
Measured values of combustion efficiency ηc, which quantify the amount of hydrogen fuel that remains unburned because the fuel has insufficient residence time in the reaction zone of a supersonic flame, are reported. Trends are reported as the fuel flow rate and the stagnation temperature are systematically varied. The combustion efficiency measurements are needed to assess chemistry submodels of numerical simulations of supersonic flames. A hydrogen jet flame is stabilized on the axis of a Mach 2.5 wind tunnel, and to explain why some fuel remains unburned images were obtained of the fuel concentration and the OH radical concentration using planar laser-induced fluorescence. Increasing the fuel flow rate (and overall fuel-air equivalence ratio from 0.034 to 0.068) is found to increase the combustion efficiency and the flame length. It is believed that the increased residence time of fuel in the longer flames causes the observed increase in efficiency. The increase the combustion efficiency caused by an increase in the stagnation temperature is quantified. Oblique shock waves were added and were found to decrease combustion efficiency if the waves are positioned to create a radial outflow of fuel away from the OH radical zone, which reduces the residence time.
Details
- Title: Subtitle
- Combustion Efficiencies of Supersonic Flames
- Creators
- Albert Ratner - University of MichiganJames F Driscoll - University of MichiganHwanil Huh - Chungnam National UniversityRodney A Bryant - National Institute of Science and Technology
- Resource Type
- Journal article
- Publication Details
- Journal of propulsion and power, Vol.17(2), pp.301-307
- DOI
- 10.2514/2.5742
- ISSN
- 0748-4658
- eISSN
- 1533-3876
- Language
- English
- Date published
- 03/2001
- Academic Unit
- Mechanical Engineering
- Record Identifier
- 9984064220402771
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