Characteristic modes and flow structure of non-premixed flame in humid-air combustion

Gu Xin; Zang Shusheng; Ge Bing

Korean Journal of Chemical Engineering, Vol.24, No.2, 354-360, March, 2007

DOI10.1007/s11814-007-5046-8 Export Citation

Characteristic modes and flow structure of non-premixed flame in humid-air combustion

Gu Xin, Zang Shusheng^†, and Ge Bing

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China

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An experimental study has been performed in order to determine the effect of humidity on the flow field and the flame stability limit in turbulent non-premixed flame. Two-dimensional Particle Image Velocimetry (PIV) measurements were made to quantify the velocity field, with and without steam injected. The results indicate the addition of steam decreases the recirculation flow and reduces the distance between the forward and aft stagnation points. The detailed stabilization regimes show that the critical fuel-to-air velocity ratios of the central fuel penetration in the humid air case are 16% to 22% lower, and the partially quenching limits are at least 25% lower. The decreased penetration limit is due to a reduction in momentum of the humid air. An analysis of flamelet concepts reveals that increased chemical reaction time leads to lower partially quenching limits in the humid air combustion.

Keywords:Humid Air Combustion;Non-premixed Combustion;Recirculation Zone;Flamelet Concept

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[2] Cho KW, Park HS, Lee YK, Korean J. Chem. Eng., 10(3), 140 (1993)

[3] Chaouki J, Klvana D, Guy C, Korean J. Chem. Eng., 16(4), 494 (1999)

[4] Katoh A, Shinoda M, Kitagawa K, Gupta AK, J. Eng. Gas Turb. Power, 128, 8 (2006)

[5] Bhargava A, Colket M, Sowa W, Casleton K, Maloney D, J. Eng. Gas Turb. Power, 122, 405 (2000)

[6] Dryer FL, in 16th Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 279 (1976)

[7] Miyauchi T, Mori Y, Yamaguchi T, in 18th Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 43 (1980)

[8] Vakil SS, Thole KA, J. Eng. Gas Turb. Power, 127, 257 (2005)

[9] Midgley K, Spencer A, McGuirk JJ, J. Eng. Gas Turb. Power, 127, 755 (2005)

[10] Dally BB, Masri AR, Barlow RS, Fiechtner GJ, Combust. Flame, 114(1-2), 119 (1998)

[11] Chen YC, Chang CC, Pan KL, Yang JT, Combust. Flame, 115(1-2), 51 (1998)

[12] Esquiva-Dano I, Nguyen HT, Escudie D, Combust. Flame, 127(4), 2167 (2001)

[13] Huang RF, Yang JT, Lee PC, Combust. Flame, 108(1-2), 9 (1997)

[14] Madsen AH, McCluskey DR, in 7th International Symposium on the Application of Laser Techniques to Fluid Mechanics, Lisbon, Portugal Springer Verlag (1994)

[15] Papadopoulos G, Bryant RA, Pitts WM, in 2nd Joint Meeting of the US Sections of the Combustion Institute, Oakland, CA (2001)

[16] Higuchi H, van Langen P, Sawada H, Tinney CE, J. Fluid Struct, 22, 949 (2006)

[17] Obi S, Tokai N, Int. J. Heat Fluid Flow, 27, 768 (2006)

[18] Braza M, Perrina R, Hoarau Y, J. Fluid Struct., 22, 757 (2006)

[19] Yoshioka S, Obi S, Masuda S, Int. J. Heat Fluid Flow, 22, 393 (2001)

[20] Meinhart CD, Wereley ST, Santiago JG, J. Fluids Eng., 122, 285 (2000)

[21] Keane RD, Adrian RJ, Meas. Sci. Technol., 1, 1202 (1990)

[22] Hedman PO, Fletcher TH, Flores DV, Graham SG, Haslam JK, Murray RL, Timothy GW, J. Eng. Gas Turb. Power, 127, 724 (2005)

[23] Masri AR, Dibble RW, Barlow RS, Prog. Energy Combust. Sci., 22(4), 307 (1996)

[24] Williams FA, Prog. Energy Combust. Sci., 26, 657 (2000)