Laminar flame speeds and strain sensitivities of mixtures of and air or air highly diluted with ( 1:9) have been measured for a range of equivalence ratios at high preheat conditions using a nozzle generated, 1D, laminar, wall stagnation flame. The measurements are compared with numerical predictions based on three detailed kinetic models (GRIMECH 3.0, a mechanism from Davis et al. (2004, “An Optimized Kinetic Model of H2∕CO Combustion,” Proc. Combust. Inst., 30, pp. 1283–1292) and a mechanism from Li et al. (2004, “An Updated Comprehensive Kinetic Model of Hydrogen Combustion,” Int. J. Chem. Kinet., 36, pp. 566–575)). Sensitivity of the measurements to uncertainties in boundary conditions, e.g., wall temperature and nozzle velocity profile (plug or potential), is investigated through detailed numerical simulations and shown to be small. The flame speeds and strain sensitivities predicted by the models for preheated reactants are in reasonable agreement with the measurements for mixtures of and standard air at very lean conditions. For and diluted air, however, all three mechanisms significantly overpredict the measurements, and the overprediction increases for leaner mixtures. In contrast, the models underpredict flame speeds for room temperature mixtures of with both standard and diluted air, based on comparisons with measurements in literature. Thus, we find that the temperature dependence of the hydrogen flame speed as predicted by all the models is greater than the actual temperature dependence (for both standard and diluted air). Finally, the models are found to underpredict the measured strain sensitivity of the flame speed for burning in diluted air, especially away from stoichiometric conditions.
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November 2008
Research Papers
Laminar Flame Speeds and Strain Sensitivities of Mixtures of at Elevated Preheat Temperatures
J. Natarajan,
J. Natarajan
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
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T. Lieuwen,
T. Lieuwen
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
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J. Seitzman
J. Seitzman
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
Search for other works by this author on:
J. Natarajan
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
T. Lieuwen
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
J. Seitzman
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150J. Eng. Gas Turbines Power. Nov 2008, 130(6): 061502 (8 pages)
Published Online: August 22, 2008
Article history
Received:
January 15, 2008
Revised:
January 16, 2008
Published:
August 22, 2008
Citation
Natarajan, J., Lieuwen, T., and Seitzman, J. (August 22, 2008). "Laminar Flame Speeds and Strain Sensitivities of Mixtures of at Elevated Preheat Temperatures." ASME. J. Eng. Gas Turbines Power. November 2008; 130(6): 061502. https://doi.org/10.1115/1.2943180
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