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Analysis of auto-ignition of heated hydrogen-air mixtures with different detailed reaction mechanisms

Ivana Stankovic (UGent) and Bart Merci (UGent)
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Abstract
Auto-ignition processes of hydrogen, diluted with nitrogen, in heated air are numerically investigated by means of an unsteady laminar flamelet approach in mixture fraction space. The focus is on the auto-ignition delay time and the most reactive mixture fraction as obtained with five chemical mechanisms. Two strongly different levels of dilution, corresponding to experiments in the open literature, are considered. This concerns low-temperature chemistry at atmospheric pressure. The temperature of the air stream is much higher than the temperature of the fuel stream in the cases under study. We extensively investigate the effect of the co-flow temperature, the conditional scalar dissipation rate and the resolution in mixture fraction space for one case. With respect to the conditional scalar dissipation rate, we discuss the Amplitude Mapping Closure (AMC) model with imposed maximum scalar dissipation rate at mixture fraction equal to 0.5, as well as a constant conditional scalar dissipation rate value over the entire mixture fraction value range. We also illustrate that an auto-ignition criterion, based on a temperature rise, leads to similar results as an auto-ignition criterion, based on OH mass fraction, provided that the hydrogen is not too strongly diluted.
Keywords
AUTOIGNITION, COMBUSTION, CO-FLOW, VITIATED COFLOW, LARGE-EDDY SIMULATION, TURBULENT LIFTED FLAMES, JET, H-2/O-2, combustion, auto-ignition, kinetics, hydrogen, hot air co-flow

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Citation

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Chicago
Stankovic, Ivana, and Bart Merci. 2011. “Analysis of Auto-ignition of Heated Hydrogen-air Mixtures with Different Detailed Reaction Mechanisms.” Combustion Theory and Modelling 15 (3): 409–436.
APA
Stankovic, I., & Merci, B. (2011). Analysis of auto-ignition of heated hydrogen-air mixtures with different detailed reaction mechanisms. COMBUSTION THEORY AND MODELLING, 15(3), 409–436.
Vancouver
1.
Stankovic I, Merci B. Analysis of auto-ignition of heated hydrogen-air mixtures with different detailed reaction mechanisms. COMBUSTION THEORY AND MODELLING. 2011;15(3):409–36.
MLA
Stankovic, Ivana, and Bart Merci. “Analysis of Auto-ignition of Heated Hydrogen-air Mixtures with Different Detailed Reaction Mechanisms.” COMBUSTION THEORY AND MODELLING 15.3 (2011): 409–436. Print.
@article{1848583,
  abstract     = {Auto-ignition processes of hydrogen, diluted with nitrogen, in heated air are numerically investigated by means of an unsteady laminar flamelet approach in mixture fraction space. The focus is on the auto-ignition delay time and the most reactive mixture fraction as obtained with five chemical mechanisms. Two strongly different levels of dilution, corresponding to experiments in the open literature, are considered. This concerns low-temperature chemistry at atmospheric pressure. The temperature of the air stream is much higher than the temperature of the fuel stream in the cases under study. We extensively investigate the effect of the co-flow temperature, the conditional scalar dissipation rate and the resolution in mixture fraction space for one case. With respect to the conditional scalar dissipation rate, we discuss the Amplitude Mapping Closure (AMC) model with imposed maximum scalar dissipation rate at mixture fraction equal to 0.5, as well as a constant conditional scalar dissipation rate value over the entire mixture fraction value range. We also illustrate that an auto-ignition criterion, based on a temperature rise, leads to similar results as an auto-ignition criterion, based on OH mass fraction, provided that the hydrogen is not too strongly diluted.},
  author       = {Stankovic, Ivana and Merci, Bart},
  issn         = {1364-7830},
  journal      = {COMBUSTION THEORY AND MODELLING},
  keywords     = {AUTOIGNITION,COMBUSTION,CO-FLOW,VITIATED COFLOW,LARGE-EDDY SIMULATION,TURBULENT LIFTED FLAMES,JET,H-2/O-2,combustion,auto-ignition,kinetics,hydrogen,hot air co-flow},
  language     = {eng},
  number       = {3},
  pages        = {409--436},
  title        = {Analysis of auto-ignition of heated hydrogen-air mixtures with different detailed reaction mechanisms},
  url          = {http://dx.doi.org/10.1080/13647830.2010.542830},
  volume       = {15},
  year         = {2011},
}

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