Highly turbulent counterflow flames: A laboratory scale benchmark for practical systems

Journal Article · Tue Sep 15 04:00:00 EDT 2009 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2009.03.017· OSTI ID:21223036

Coppola, Gianfilippo; Coriton, Bruno; Gomez, Alessandro ^[1]

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1. Department of Mechanical Engineering, Yale Center for Combustion Studies, Yale University, P.O. Box 208286, New Haven, CT 06520-8286 (United States)

We propose a highly turbulent counterflow flame as a very useful benchmark of complexity intermediate between laminar flames and practical systems. By operating in a turbulent Reynolds number regime of relevance to practical systems such as gas turbines and internal combustion engines, it retains the interaction of turbulence and chemistry of such environments, but offers several advantages including: (a) the achievement of high Reynolds numbers without pilot flames, which is particularly advantageous from a modeling standpoint; (b) control of the transition from stable flames to local extinction/reignition conditions; (c) compactness of the domain by comparison with jet flames, with obvious advantages from both a diagnostic and, especially, a computational viewpoint; and (d) the reduction or, altogether, elimination of soot formation, thanks to the high strain rates and low residence times of such a system, and the establishment of conditions of large stoichiometric mixture fraction, as required for robust flame stabilization. We demonstrate the phenomenology of such highly strained turbulent flames under conditions spanning unpremixed, partially premixed and premixed regimes. The system lends itself to the validation of DNS and other computational models. It is also well-suited for the examination of practical fuel blends - a need that is becoming more and more pressing in view of the anticipated diversification of the future fossil fuel supply. (author)

• OSTI ID: 21223036
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 9 Vol. 156; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BENCHMARKS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
COUNTERFLOW SYSTEMS
FLAMES
GAS TURBINES
INTERNAL COMBUSTION ENGINES
JETS
MATHEMATICAL MODELS
MIXTURES
Opposed jets
REYNOLDS NUMBER
SIMULATION
SOOT
STABILIZATION
STOICHIOMETRY
STRAIN RATE
TURBULENCE
Turbulent flames
VALIDATION