Measurement of Flame Height by Image Processing Method

Abstract:

In order to measure the flame height (L_f), the image processing method was employed. The jet flame image was captured by the common-used digital camera. The resolution (C, with the unit of mm/pixel) of the pixel of the digital camera was calibrated by metric scale. The jet flame image was then successively processed by ROI (region of interest) processing, gray processing, binarization and edge detection. Through the image processing, the pixels where the flame root and the flame tip were located was detected. The flame region expressed in pixels can be easily obtained by the difference between the flame root (X₁) and the flame tip(X₂). The flame height (L_f) was calculated by multiplying the difference in pixels (L_p= X₂-X₁) with the resolution of pixel (in millimetres per pixel). Using the proposed method, the flame heights of the pulverized coal jet flame at the high temperature air combustion condition were measured. The effect of experimental parameters on the flame heights of the coal jet flame was discussed.

• Periodical: Advanced Materials Research (Volumes 301-303)
• Pages: 983-988
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.301-303.983
• Online since: July 2011
• Authors: Li Gang Zheng, Ming Gao Yu, Shui Jun Yu, Chang Lu
• Keywords: Coal Flame, Flame Height, High-Temperature Air Combustion (HTAC), Image Processing, Jet Flame

References

[1] T.R. Blakea and M. McDonalda Combustion and Flame Vol. 94 (1993), p.426.

[2] J. F. Driscoll, H. Huh, Y. Yoon and J. Donbar: Combustion and Flame Vol. 107 (1996), p.176.

[3] M. A. Mikofski, T.C. Williams, C.R. Shaddix and L.G. Blevins: Combustion and Flame Vol. 146 (2006), p.63.

DOI: 10.1016/j.combustflame.2006.04.006

[4] P.S. Cumbera, and M. Spearpointb: Fire Safety Journal Vol. 41 (2006), p.215.

[5] J. S. Newman and C. J. Wieczorek: Fire Safety Journal Vol. 39 (2004), p.375.

[6] W. Yang and W. Blasiak: Energy Fuels Vol. 18 (2004), p.1329.