Ambient pressure effect on non-premixed turbulent combustion of CH4–H2 mixture. (20th July 2016)

• Record Type: Journal Article
• Authors: Ziani, L.; Chaker, A.
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 27(2016)
• Page Start: 11842
• Page End: 11847
• Publication Date: 2016-07-20
• Subjects: Pressure effect -- Numerical simulations -- Non-premixed turbulent combustion -- CH4–H2 mixtures; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.11.167
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The present work is devoted to the study of the effect of ambient pressure on non-premixed turbulent combustion of a mixture of 20% of hydrogen and 80% of methane. The simulations were conducted using the PDF approach and modified k - ε turbulence model. The flamelet model was used with the GRI 2.11 detailed kinetic mechanism. The flame consists of two coaxial jets of air and a jet of CH4–H2 mixture with pilot flame. After validating the model used we have varied the ambient pressure from 1 to 10 atm. We observed that the increase of ambient pressure leads to a slight increase of the flame temperature and the mass fraction of NO and a decrease in the radial and axial expansions. Highlights: Simulation of turbulent diffusion flame with the PDF approach using the flamelet model and the modified k-epsilon model. Evaluation of the combustion model within non-premixed turbulent combustion with coaxial geometry at high pressure. Evaluation of the effect of ambient pressure on methane enriched with hydrogen flame. Increase ambient pressure shrinks the flame.