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International Heat Transfer Conference 13
Graham de Vahl Davis (open in a new tab) School of Mechanical and Manufacturing Engineering, University of New South Wales, Kensington, NSW, Australia
Eddie Leonardi (open in a new tab) Computational Fluid Dynamics Research Laboratory, School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, Australia 2052

ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

MASS SPECTROMETRIC, LASER-INDUCED FLUORESCENCE AND CHEMICAL KINETIC MODELING STUDIES OF N2O AND NO2, BURNER-STABILIZED FLAMES

page 8
DOI: 10.1615/IHTC13.p26.280
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SINOPSIS

We report on our experimental and chemical modeling studies of H2/N2O, H2/NH3/N2O, and H2/N2O/NO2 flames. We studied these flames in order to test and refine a detailed chemical mechanism that we assembled from critical literature review. Our mechanism consists of over 100 reactions and 22 species. We measured the flame temperatures with a coated, thin-wire thermocouple, and by OH and NH laser-induced fluorescence (LIF). A multiparameter, computer program based on a Boltzmann, rotational distribution analyses yields the flame temperatures as a function of height above the burner. The program utilizes OH and NH rotational energy levels and one-photon line strengths, and its parameters include laser line shape, temperature, and absolute and relative frequency values of the observed spectral data. We measured the flame species concentrations of H2, NH3, NO2, N2O, N2, H2O, NO, O2, NH and OH by molecular beam-mass spectrometry, LIF, or both, and also calculated them with PREMIX, a one-dimensional, laminar, flame code, with our detailed chemical mechanism as input. Overall, the PREMIX calculations predict very well the major and minor species concentrations throughout each flame. The addition of about 4% of NH3 to the H2/N2O flame decreases the post flame O2, OH, and NO concentrations by approximately 90, 45, and 35%, respectively. This decrease is predicted rather well by the PREMIX calculations, which show a decrease in O2, OH, and NO by approximately 90, 55, and 40%, respectively. The shapes of the modeled O2, NO, and OH profiles for the H2/N2O/NO2 flame are also in good agreement with those observed experimentally. The modeled OH profile even predicts an observed peak at approximately 3.5 mm above the burner surface. Our rate and sensitivity analyses reveals that this OH peak is due to the competition between the NO2+H = NO+OH reaction, which produces OH, and the H2+OH = H2O+H reaction, which consumes it.

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