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2-Dimensional Unsteady Modeling of Spray Flame Formed in a Laminar Counterflow Field - Effects of Equivalence Ratio and Fuel -  

Hwang, Seung-Min (Department of Health Environment, Graduate School of Venture, Hoseo University)
Chung, Jin-Do (Department of Environmental Engineering, Hoseo University)
Seo, Byung-Min (Department of Environmental Engineering, Hoseo University)
Kim, Young-Woo (Department of Automotive Engineering, Hoseo University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.10, 2009 , pp. 933-940 More about this Journal
Abstract
To evaluate characteristics in spray flame, laminar counterflow is investigated on the effects of equivalence ratio and fuel by a two-dimensional DNS (direct numerical simulation). For the gaseous phase, Eulerian mass, momentum, energy, and species conservation equations are solved. For the disperse phase, all individual droplets are calculated by the Lagrangian method without the parcel model. n-Decane ($C_{10}H_{22}$) and n-heptane ($C_7H_{16}$) is used as a liquid spray fuel, and a one-step global reaction is employed for the combustion reaction model. As equivalence ratio increases, the fuel ignites early and the high temperature region spreads wider. The peak value of temperature, however, tends to once increase and then decreases with increasing equivalence ratio. The decrease in the peak value of temperature for the higher equivalence ratio condition is caused by the cooling effect associated with droplet group combustion. Since the evaporation of n-heptane is early, the high temperature region spreads wider than ndecane, but the peak values of temperature for both n-heptane and n-decane is almost same.
Keywords
Direct Numerical Simulation; Laminar Counterflow; Spray Flame; Mixture Fraction;
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