Abstract
The present paper reports the effects of N2 addition and preheating of reactants on bluff-body stabilized coaxial LPG jet diffusion flame for two cases, namely, (I) preheated air and (II) preheated air and fuel. Experimental results confirm that N2 addition to the fuel stream leads to an enhancement in flame length, which may be attributed to the reduction in flame temperature. The soot free length fraction (SFLF) also increases, which might be caused by the decrease in fuel concentration and flame temperature. The flame length and also the SFLF are observed to be reduced with increasing temperature of reactants and lip thickness of the bluff body. The NO x emission level for all burner configurations are found to be attenuated with nitrogen addition, which can be attributed to the reduction of the residence time of the gas mixture in the flame. The emission index of NO x (EINO x ) also becomes enhanced with increasing lip thickness and reactant temperature due to an increased residence time and thermal effect, respectively.
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References
I. Esquiva-Dano, H. T. Nguyen, and D. Escudie, “Influence of a bluff-body’s shape on the stabilization regime of non-premixed flames,” Combust. Flame, 127, 2167–2180 (2001).
K. Kimoto, I. Shiraishi, and R. Matsumoto, “Structure of turbulent jet flame stabilized in annular air jet,” Combust. Sci. Technol., 25, 31–41 (1981).
R. S. Tankin, W. M. Roquemore, H. H. Chiu, and S. A. Lottes, “A study of a bluff-body combustor using laser sheet lighting,” Exp. Fluids, 4, 205–213 (1986).
H. K. Ma and J. S. Harn, “The jet mixing effect on reaction flow in a bluff-body burner,” Int. J. Heat Mass Transfer, 37, 2957–2967 (1994).
N. H. Qamar, G. J. Nathanb, Z. T. Alwahabia, and K. D. King, “The effect of global mixing on soot volume fraction: Measurements in simple jet, precessing jet, and bluff body flames,” Combust. flame, 30, 1493–1500 (2005).
J. H. Kent and S. J. Bastin, “Parametric effects on sooting in turbulent acetylene diffusion flames,” Combust. Flame, 56, 29–42 (1984).
B. B. Dally, A. R. Masri, R. S. Barlow, G. J. Fiechtner, and D. F. Fletcher, “Measurement of NO in turbulent non-premixed flames stabilized on a bluff-body,” in: Proc. of 26th Int. Symp. on Combustion (1996), pp. 2191–2197.
B. B. Dally, A. R. Masri, R. S. Barlow, and G. J. Fiechtner, “Instantaneous and mean compositional structure of bluff-body stabilized non-premixed flames,” Combust. Flame, 114, 119–148 (1998).
O. Angrill, H. Geitlinger, T. Streibel, R. Suntz, and H. Bockhorn, “Influence of exhaust gas recirculation on soot formation in diffusion flames,” in: Proc. of 28th Int. Symp. on Combustion (2000), pp. 2643–2649.
J. Zhang, Y. Pu, and L. Zhou, “Turbulence characteristics of swirling reacting flow in a combustor with staged air injection,” Chinese J. Chem. Eng., 14, 634–641 (2006).
E. S. Cho and S. H. Chung, “Characteristics of NOx emission with flue gas dilution in air and fuel sides,” KSME Int. J., 18, 2303–2309 (2004).
T. Toshimi, Z. Xu, and K. Masaharu, “Preferential diffusion effects on the temperature in usual and inverse diffusion flames,” Combust. Flame, 106, 252–260 (1996).
T. Ishiguro, S. Tsuge, T. Furuhata, et al., “Homogenization and stabilization during combustion of hydrocarbons with preheated air,” in: Proc. 27th Int. Symp. on Combustion, 3205–3213 (1998).
F. Toshiro, D. Riechelmann, and S. Juntchi, “Effect of liftoff on NOx emission of turbulent jet flame in high temperature coflowing air,” ibid., pp. 1149–1155.
S. R. Turns and F. H. Myhr, “Oxides of nitrogen emissions from turbulent jet flames: Part I. Fuel effects and flame radiation,” Combust. Flame, 87, 319–335 (1991).
H. Kellerer, A. Muller, H. J. Bauer, and S. Wittig, “Soot formation in a shock tube under elevated pressure conditions,” Combust. Sci. Technol., 113, 67–80 (1996).
R. L. Axelbaum and C. K. Law, “Soot formation and inert addition in diffusion flames,” in: Proc. 23rd Int. Symp. on Combustion, 1517–1523 (1990).
O. L. Gulder, D. R. Snelling, and R. A. Sawchuk, “Influence of hydrogen addition to fuel on temperature field and soot formation in diffusion flames,” in: Proc. 26th Int. Symp. on Combustion, 2351–2358 (1996).
J. J. Feese and S. R. Turns, “Nitric oxide emission in laminar diffusion flame: effects of air side versus fuel side diluent addition,” Combust. Flame, 113, 66–78 (1998).
F. G. Roper, “The prediction of laminar jet diffusion flame sizes: Part I. Theoretical model,” Combust. Flame, 29, 219–226 (1977).
F. G. Roper, C. Smith, and A. C. Cunningham, “The prediction of laminar jet diffusion flame sizes: Part II. Theoretical model,” Combust. Flame, 29, 227–234 (1977).
R. J. Santoro, T. T. Yeh, J. J. Horvath, and H. G. Semerjian, “The transport and growth of soot particles in laminar diffusion flames,” Combust. Sci. Technol., 53, 89–115 (1987).
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Translated from Fizika Goreniya i Vzryva, Vol. 45, No. 1, pp. 3–10, January–February, 2009.
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Kumar, P., Mishra, D.P. Experimental study of N2 dilution on bluff-body stabilized LPG jet diffusion flame. Combust Explos Shock Waves 45, 1–7 (2009). https://doi.org/10.1007/s10573-009-0001-0
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DOI: https://doi.org/10.1007/s10573-009-0001-0