Experimental and Numerical Study on Diluted Premixed Laminar Dimethyl Ether-Air Flames

Abstract:

Effects of diluents on premixed laminar dimethyl ether (DME)/air flames were studied experimentally and numerically. The results show that measurements and predictions in laminar burning velocities are in reasonably good agreement. Laminar flame speeds of DME mixtures decrease with the increase of dilution ratio. For a specific diluent ratio, suppression effect of diluent decreases in the order of carbon dioxide, nitrogen and argon. Influences of argon and nitrogen are mainly due to the increase of specific heat of the non-fuel gases in the mixture, and that of carbon dioxide is resulted from the combination effect of dilution and direct reaction. CO₂ participating reaction, CO+OHCO₂+H, competes for H radical in the chain branching reaction H+O₂ O+OH. This competition decreases concentration of the radicals like H, O and OH, leading to a significant reduction in laminar burning velocity.

• Periodical: Advanced Materials Research (Volumes 732-733)
• Pages: 18-22
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.732-733.18
• Online since: August 2013
• Authors: Zhao Yang Chen, Chong Long Tang
• Keywords: Dilution, Dimethyl Ether, Experiment, Numerical Simulation, Premixed Flame

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