THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Bo Lou

,

Yonghai Qiu

,

Jianhong Xu

CHARACTERISTICS OF DIFFUSION FLAMES WITH ACCELERATED MOTION

ABSTRACT
The aim of this work is to present an experiment to study the characteristics of a laminar diffusion flame under acceleration. A Bunsen burner (nozzle diameter 8 mm), using liquefied petroleum gas as its fuel, was ignited under acceleration. The temperature field and the diffusion flame angle of inclination were visualised with the assistance of the visual display technology incorporated in MATLAB™. Results show that the 2-d temperature field under different accelerations matched the variation in average temperatures: they both experience three variations at different time and velocity stages. The greater acceleration has a faster change in average temperature with time, due to the accumulation of combustion heat: the smaller acceleration has a higher average temperature at the same speed. No matter what acceleration was used, in time, the flame angle of inclination increased, but the growth rate decreased until an angle of 90°: this could be explained by analysis of the force distribution within the flame. It is also found that, initially, the growth rate of angle with velocity under the greater acceleration was always smaller than that at lower accelerations; it was also different in flames with uniform velocity fire conditions.
KEYWORDS
accelerated moving fire, diffusion flame, temperature field, flame characteristics
PAPER SUBMITTED: 2015-12-13
PAPER REVISED: 2015-11-10
PAPER ACCEPTED: 2015-11-13
PUBLISHED ONLINE: 2015-12-13
DOI REFERENCE: https://doi.org/10.2298/TSCI150413180L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Issue 6, PAGES [2113 - 2124]
REFERENCES
  1. Najafian, Z. Ashrafi, M. Ashjaee, Temperature field measurement of an array of laminar premixed slot flame Jets using Mach-Zehnder interferometry, Opt Laser Eng, 68 (2015) pp.194-202..
  2. W. Yan, C. Lou, Two-dimensional distributions of temperature and soot volume fraction inversed from visible flame images, Exp Therm Fluid SCI, 50 (2013) pp.229-233.
  3. X. Zhang, L. Hu, W. Zhu, X. Zhang, Flame extension length and temperature profile in thermal impinging flow of buoyant round jet upon a horizontal plate, APPL THERM ENG, 73 (2014) pp.15-22.
  4. J.L. A, B.B. Enrico, Y. Weihong, T.B.C. Leonardo, Flame characteristics of pulverized torrefied-biomass combusted with high-temperature air, Combust Inst,, 160 (2013) pp.2585-2594.
  5. J. Fang, T. Ran, J. Guan, Jin-jun, Influence of low air pressure on combustion characteristics and flame pulsation frequency of pool fires, Fuel, 90(2011) pp.2760-2766.
  6. Z. Gao, J. Ji, H. Wan, K. Li, J. Sun, An investigation of the detailed flame shape and flame length under the ceiling of a channel, P Combust Inst, 35 (2015) pp. 2657-2664.
  7. T.F. Guiberti, D. Durox, P. Scouflaire, T. Schuller, Impact of heat loss and hydrogen enrichment on the shape of confined swirling flames, P Combust Inst, 35 (2015) pp.1385-1392.
  8. H. Xiao, Q. Wang, X. He, Experimental study on the behaviors and shape changes of premixed hydrogen-air flames propagating in horizontal duct, Int J Hydrogen Energ, 36 (2011) pp. 6325-6336.
  9. J. Hu, B.R.E. Sher, The effect of an electric field on the shape of co-flowing and candle-type methane-air flames, Exp Therm Fluid SCI, 21 (2000) pp. 124-133.
  10. J. Oh, N. Dongsoon, Flame characteristics of a non-premixed oxy-fuel jet in a lab-scale furnace, Energy,81 (2015) pp. 328-343
  11. P.H. Thomas, The size of flame from natural fires, Proc Combust Inst , 9 (1963) pp.844-859.
  12. L. Hu, X. Zhang, Q. Wang, A. Palacios, Flame size and volumetric heat release rate of turbulent buoyant jet diffusion flames in normal- and a sub-atmospheric pressure, Fuel, 150 (2015) pp. 278-287.
  13. W.J. Lee, H.D. Shin, Visual characteristics, including lift-off, of the jet flames in a cross-flow high-temperature burner, Appl Energy, 76 (2003) pp.257-266.
  14. H.X. Chen, A.L. N., K.C. W., Wind tunnel tests on compartment fires with crossflow ventilation, J Wind Eng Ind Aerod , 9 (2011) pp.1025-1035.
  15. O.A. Pipkin, C.M. Sliepcevich, Effect of wind on buoyant diffusion flames, Ind Eng Chem Fundam, 3 (1964) pp.147-154.
  16. L. Hu, S. Liu, J.L. de Ris, L. Wu, A new mathematical quantification of wind-blown flame tilt angle of hydrocarbon pool fires with a new global correlation model, FUEL, 106(2013) pp.730-736.
  17. K. Ohtake, K. Okazaki., Optical CT measurement and mathematical prediction of multi-temperature in pulverized coal combustion field, Int J Heat Mass Trans, 31 (1988) pp.397-405.
  18. J.R. Welker, O.A. Pipkin, C.M. Sliepcevich, The Effect of Wind on Flames, 1965, pp. 122-129.DOI: 10.1007/BF02588482
  19. W. Chengye, L. Xiaodong, M. Zengyi, X. Fei, Research of the Numerical Method of the Colorimetric Temperature-Measurement Method Used in High Temperature Flame Image Process, Journal of Combustion Science and Technology, 4(3)(1998) 307-311.
PDF VERSION [DOWNLOAD]
Characteristics of diffusion flames with accelerated motion

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence