A Modeling Study on the Premixed CH4/Air Flames: Dependence of Laminar Flame Speed on Pressure and Preheating Temperature
Monikankana Sharma1, Makihito Nishioka2, Subhash C. Mishra3,a and Pinakeswar Mahanta3,b
1Center for Energy, IIT Guwahati, Guwahati 781 039, India.
m.sharma@iitg.ernet.in
2Department of Engineering, Mechanics and Energy, University of Tsukuba, Tsukuba 3058573, Japan.
mnisioka@kz.tsukuba.ac.jp
3Department of Mechanical Engineering, IIT Guwahati, Guwahati 781 039, India.
ascm_iitg@yahoo.com
bpinak@iitg.ernet.in
ABSTRACT
This paper describes the results of a numerical investigation aimed at identifying the effects of pressure and preheating on laminar flame speed of CH4/Air mixtures. In this study, the lean flame structures were computed using CHEMKIN II and PREMIX codes. A kinetic mechanism called GRI-Mech 3.0 with 53 species was used and the laminar flame speed at high initial temperature and pressure was calculated. The study covers a wide range of equivalence ratios of 0.25 to 3. The pressure variation was done from 1 atm to 16 atm and the temperature from 300–800 K. The results show a clear dependence of pressure and temperature of unburnt fuel air mixture on flame speed.
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