期刊
FUEL
卷 116, 期 -, 页码 781-786出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2013.08.059
关键词
Turbulent buoyant jet diffusion flame; Reduced atmospheric pressure; Flame radiation fraction; Reynolds number
资金
- National Nature Foundation of China [51036007]
- National Basic Research Program of China [2012CB719702]
- Fundamental Research Funds for the Central Universities
- Chinese Academy of Science Visiting Professorship for Senior International Scientists [2009Z2-30]
- NSFC-RS international exchange program [51311130130]
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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