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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

Figures

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Typical temperature history of the TWMR calculation (τmix=100 ms)
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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.
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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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