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TECHNICAL PAPERS: Gas Turbines: Combustion and Fuel

Reduced Mechanisms for Prediction of NO2 Formation and Ignition Delay in Methane-Air Combustion

[+] Author and Article Information
R. Homma

Energy and Environmental Technology Laboratory, Tokyo Gas Co. Ltd., 16-25 Shibaura, 1-Chome Minato-ku, Tokyo, 105-0023 Japan

J.-Y. Chen

Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720-1740

J. Eng. Gas Turbines Power 123(2), 303-307 (Dec 01, 2000) (5 pages) doi:10.1115/1.1360687 History: Received October 01, 2000; Revised December 01, 2000
Copyright © 2001 by ASME
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References

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Feitelberg, A. S., and Correa, S. M., 1999, “The Role of Carbon Monoxide in NO2 Plume Formation,” ASME paper No. 99-GT-053, pp. 1–7.
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Blasco,  J. A., Fueyo,  N., Dopazo,  C., and Chen,  J.-Y., 2000, “A Self-Organized-Map Approach to Chemistry Representation in Combustion Applications,” Combust. Theory Modell., 4, pp. 61–76.
Miller,  J. A., and Bowman,  C. T., 1989, “Mechanism and Modeling of Nitrogen Chemistry in Combustion,” Prog. Energy Combust. Sci., 15, pp. 287–338.
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Amano,  T., and Hase,  K., 1994, “Cooling Conditions of Hot Exhaust Gas for Low Conversion of NO to NO2,” J. Inst. Energy, 67, pp. 174–180.
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Figures

Grahic Jump Location
Typical temperature history of the TWMR calculation (τmix=100 ms)
Grahic Jump Location
Evolution of NO2/NOx ratio in the TWMR during the dilution by air at ambient pressure. Lines: Miller-Bowman 9, broken lines: 14 step; dotted lines: 16 step.
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Evolution of NO2/NOx ratio in the TWMR during the dilution by air at elevated pressure (p=30 atm). Lines: Miller-Bowman 9, broken lines: 14 step; dotted lines: 16 step.
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Evolution of NO2/NOx ratio in the TWMR during the dilution by air doped with 500 ppm of methane at ambient pressure. Lines: Miller-Bowman 9, broken lines: 14 step; dotted lines: 16 step.
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Major species profiles in methane-air opposed flame. Strain rate a=100 (1/s). Lines: Miller-Bowman 9, broken lines: 14 step; dotted lines: 16 step.
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H, O, OH, and HO2 profiles in methane-air opposed flame. Strain rate a=100/s. Lines: Miller-Bowman 9, broken lines: 14 step; dotted lines: 16 step.
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Profiles of NO and NO2 mole fractions in opposed methane-air diffusion flame with strain rate a=100/s. Solid lines: Miller-Bowman 9, broken lines: 14 step; dotted lines: 16 step.
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Dependence of ignition delay time on initial mixture temperature at p=1 atm. Lines: Miller-Bowman 9, symbols: 16-step reduced mechanism.
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Dependence on ignition delay on pressure with initial mixture at T=1000 K. Lines: Miller-Bowman 9, symbols: 16-step reduced mechanism.
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Temperature profiles during autoignition process obtained with various reduced mechanisms (thin lines) and the starting detailed mechanism (thick line) at lean condition (ϕ=0.6). 15 step-a: assumes QSSA for CH2O; 15 step-b: assumes QSSA for C2H6; 15 step-c: assumes QSSA for C2H4; 15 step-d: assumes QSSA for HO2. “M-B” denotes Miller-Bowman 9 mechanism.
Grahic Jump Location
Carbon atom flow diagram during pre-ignition process of methane-air mixture (ϕ=0.6, Tin=1100 K)
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Ratios of H, O, and OH concentration in fast mixing case (τmix=1 ms) to those in slow mixing case (τmix=100 ms) showing a significant buildup of H radical when mixing is fast

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