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Title: Large eddy simulation of hydrogen-enriched methane-air premixed flames in a confined swirl burner
Authors: Cicoria, D 
Chan, CK 
Keywords: Finite rate chemistry
Flame stability
Hydrogen-enrichment of methane flames
Large eddy simulation
Turbulent premixed combustion
Issue Date: 2017
Publisher: Newswood Publications
Source: Lecture notes in engineering and computer science, 2017, v. 2230, p. 809-814 How to cite?
Journal: Lecture notes in engineering and computer science 
Abstract: Large eddy simulation (LES) is employed to investigate the effects of hydrogen addition on lean CH4-air turbulent confined swirling premixed flames for mixtures up to 50% of hydrogen in volume. The subfilter combustion term representing the interaction between turbulence and chemistry is modelled using the PaSR model, along with complex chemistry using a skeletal mechanism based on GRI-MECH3.0. At constant swirl number and equivalence ratio, results show a similar trend as in experiments concerning the flame shape and stabilization mechanism. Increasing hydrogen in the fuel mixture leads to an increase of turbulent flame speed, reactivity, flame temperature and NO emissions. Streamline profiles of mean velocity highlight the change in flame shape at higher hydrogen content due to a big jump in velocity inside the flame, and the structural modification of the outer recirculation zone. Independently of the equivalence ratio, the mean flame shape is shorter and turbulent flame thickness decreases as hydrogen is increased. Also, heat release becomes less sensitive to the change of equivalence ratio when hydrogen is more present in the fuel mixture.
Description: 2017 World Congress on Engineering, WCE 2017, London, United Kingdom, 5-7 July 2017
ISBN: 9.78988E+12
ISSN: 2078-0958
EISSN: 2078-0966
Appears in Collections:Conference Paper

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