One-dimensional turbulence model simulations of autoignition of hydrogen/carbon monoxide fuel mixtures in a turbulent jet

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2010.09.003· OSTI ID:21401360

Gupta, Kamlesh G; Echekki, Tarek ^[1]

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1. Department of Mechanical and Aerospace Engineering, North Carolina State University, NC (United States)

The autoignition of hydrogen/carbon monoxide in a turbulent jet with preheated co-flow air is studied using the one-dimensional turbulence (ODT) model. The simulations are performed at atmospheric pressure based on varying the jet Reynolds number and the oxidizer preheat temperature for two compositions corresponding to varying the ratios of H{sub 2} and CO in the fuel stream. Moreover, simulations for homogeneous autoignition are implemented for similar mixture conditions for comparison with the turbulent jet results. The results identify the key effects of differential diffusion and turbulence on the onset and eventual progress of autoignition in the turbulent jets. The differential diffusion of hydrogen fuels results in a reduction of the ignition delay relative to similar conditions of homogeneous autoignition. Turbulence may play an important role in delaying ignition at high-turbulence conditions, a process countered by the differential diffusion of hydrogen relative to carbon monoxide; however, when ignition is established, turbulence enhances the overall rates of combustion of the non-premixed flame downstream of the ignition point. (author)

• OSTI ID: 21401360
• Journal Information: Combustion and Flame, Vol. 158, Issue 2; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
AUTOIGNITION
TIME DELAY
HYDROGEN
TURBULENCE
COMBUSTION
MIXTURES
JETS
ONE-DIMENSIONAL CALCULATIONS
DIFFUSION
SIMULATION
AIR
HEATING
REYNOLDS NUMBER
FLAMES
TEMPERATURE RANGE 0400-1000 K
ATMOSPHERIC PRESSURE
OXIDIZERS
Turbulent flames
Differential diffusion