L. H. Hu, Q. Wang, M. Delichatsios, S. X. Lu and F. Tang (2014) Fuel 116 781-786. |
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Date: 2015-03-30
Author: SKLFS  , Source: SKLFS  ,
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L. H. Hu, Q. Wang, M. Delichatsios, S. X. Lu and F. Tang (2014) Flame radiation fraction behaviors of sooty buoyant turbulent jet diffusion flames in reduced- and normal atmospheric pressures and a global correlation with Reynolds number. Journal/Fuel 116 781-786. [In English] Web link: http://dx.doi.org/10.1016/j.fuel.2013.08.059 Keywords: ,Turbulent buoyant jet diffusion flame, Reduced atmospheric pressure, Flame radiation fraction, Reynolds number, POOL FIRES, COMBUSTION CHARACTERISTICS, DIFFERENT ALTITUDES, N-HEPTANE, SURFACE, HEIGHT, FLOW Abstract: This paper reports new experimental observations on flame radiation fraction of sooty turbulent buoyant jet diffusion flames in a reduced atmospheric pressure (at high altitude in Tibet) and corresponding scaling theoretical interpretations. A global correlation of the flame radiation fraction with Reynolds number is proposed for both the reduced- and normal pressures. Experiments are carried out in both Hefei (altitude: 50 m) with atmospheric pressure of 100 kPa and Lhasa (altitude: 3650 m) with atmospheric pressure of 64 kPa. The turbulent buoyant jet diffusion flames are produced by nozzles with diameters of 4, 5, 6, 8 and 10 mm using propane as fuel at different flow rates. The emitted thermal radiation fluxes by the flames, for both attached condition and lifted off condition, are measured by a water-cooled radiometer. The flame radiation fraction change due to pressure reduction is clarified. Results show that the flame radiation fraction changes little with atmospheric pressure. A dimensional scaling theory is proposed to interpret this pressure dependency behavior. The flame radiation fraction for attached flame is found to be higher than that for lifted-off flame, decreasing in both cases with increasing nozzle fuel velocity or turbulent mixing at the flame base. Such decreasing behavior is found to be well fitted globally by a negative power law function on source Reynolds number (chi(R) similar to Re (0.32)) of the discharged fuel flow at the nozzle. (C) 2013 Elsevier Ltd. All rights reserved.
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State Key Laboratory of Fire Science, University of Science and Technology of China
Jinzhai Road 96, Hefei, Anhui, P. R. China
P. O.: 230026 |
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Tel:(+86)551 63601651 |
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E-mail:sklfs@ustc.edu.cn |
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