Abstract
A model based on similarity transformation, for the nitrogen-diluted, H2-air opposed-jet laminar counterflow diffusion flame (CFDF), was developed independently of earlier models, and numerically solved to study flame location and flame structure and extinction limits. Numerical stiffness is handled by a special treatment of the species production term. Flame location with respect to the stagnation plane is identified as an important parameter that governs H2-air diffusion flames, and physical explanations are given to show how flame location is affected by fuel dilution, strain rate, and Lewis number. Results show very good agreement with experimental extinction conditions. The effect of thermal diffusion on the flame is found to be negligible. The simpler, constant Lewis number model produced extinction at half the strain rate compared to the species-dependent Lewis number model. The hydrogen-air CFDF exhibits several characteristics not observed for hydrocarbon flames. The underlying reasons are discussed in terms of the fluid dynamic and chemical kinetic aspects.
Recommended Citation
J. Zhao et al., "Global Characteristics and Structure of Hydrogen-Air Counterflow Diffusion Flames," Journal of Propulsion and Power, vol. 12, no. 3, pp. 534 - 542, American Institute of Aeronautics and Astronautics, Jan 1996.
The definitive version is available at https://doi.org/10.2514/3.24067
Department(s)
Mechanical and Aerospace Engineering
Publication Status
Full Access
International Standard Serial Number (ISSN)
1533-3876; 0748-4658
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 American Institute of Aeronautics and Astronautics, All rights reserved.
Publication Date
01 Jan 1996