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Numerical Simulation on Characteristics of Laminar Diffusion Flame Placed Near Wall in Microgravity Environment  

Choi Jae-Hyuk (한국원자력연구소 원자력수소 사업추진반)
Fujita Osamu (일본 북해도대학 기계우주전공분야)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.30, no.1, 2006 , pp. 140-149 More about this Journal
Abstract
Characteristics of a laminar diffusion flame placed near wall in microgravity have been numerically analyzed in a two-dimension. The fuel for the flame is $C_2H_4$. The flame is initiated by imposing a high temperature ignition source. The flow field, temperature field, and flame shape in microgravity diffusion flame are detailed. Especially, effects of surrounding air velocity and fuel injection velocity on the microgravity diffusion flame have been discussed accounting for standoff distance. And, the effect of curvature rate has been also studied. The results showed that velocities in a diffusion flame were overshoot because of volumetric expansion and distribution of temperature showed regularity by free-buoyancy This means that the diffusion flame in microgravity is very stable, while the flame in normal gravity is not regular and unstable due to buoyancy. Standoff distance decreases with increase in surrounding air velocity and with decrease in fuel injection velocity. With increasing curvature rate, the position of reaction rate moves away the wall.
Keywords
Diffusion flame; Surrounding air; Standoff distance; Microgravity; Reaction rate;
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