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Phenomenological studies relating to the oscillation of buoyant diffusion flames are very important to design flare systems in the energy and petrochemical industry or develop an image recognition algorithm for wind-aided fire detection. In this work, the oscillation frequency for the “down-wash mode” buoyant diffusion propane flames (momentum flux ratio of jet to cross-wind<0.1, 6×10−5<Froude...
This paper reports an interesting experimental phenomenon regarding flame radiant fraction and flame volume of laminar diffusion methane flames under sub-atmospheric conditions. The quantitative formula of flame volume was derived by assuming that the shape of the flame was cylindrical, with which the relation between flame volume and ambient pressure was obtained. Then the dependence of flame radiant...
Buoyancy and momentum are two major driving forces that affect the behavior of diffusion flames, which have not been fully interpreted in sub-atmospheric environments. In this work, a theoretical model based on the cylindrical flame shape is proposed incorporating with the flame width and height in order to predict the steady flame height with Richardson number. The theoretical equation of dimensionless...
Observations based on short-duration experiments under microgravity of the characteristics of laminar jet diffusion flames burning in coflowing air conditions are described. Experimental conditions were such to establish a flow with Reynolds number of 140 and low air flow velocities of 0–0.5m/s to produce steady laminar flames. Previous studies ignored effects of air flow velocity with small air stream...
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