Experimental study of stability of V-shaped flame in a premixed swirl burner

Document Type : Research Article

Authors

Abstract

In this work, stability of V shaped flame in a premixed swirl burner is studied. The effect of firing rate (input energy per unit area), equivalence ratio and axial velocity of fuel and air mixture on the stability of a V shaped flame is studied. For swirl generation, a 45o angle swirler is used in the air inlet, which yields a flow with a swirl number of 0.78. Observations show that V shaped flame is formed in a lean mixture of fuel and air (). When firing rate increases, it is observed that flow velocity at V flame formation instant is independent of flow rate and increases linearly from 1 m/s to 5 m/s. flame lift off occurs in larger equivalence ratio and mixture velocity when firing rate increases. With increasing mixture velocity, flame quenching occurs in smaller equivalence ratios and larger firing rates. Hence, stability limit of V flame increases with increasing cross section.

Keywords

Main Subjects

References

[1] Beer,J.M., chigier,N.A., 1972. “Combustion Aerodynamics”. Applied science publishers Ltd.
[2] Pollard, A., Ozem, H. L. M., and Grandmaison, E. W.,2000. “Turbulent, swirling flow over an axisymmetric,
constant radius surface”. Experimental Thermal and Fluid Science, 29, pp. 493-509.
[3] Anacleto, P. M., Fernandes, E. C., Heitor and Shtork, S. I., 2002. “ haracterization of a Strong Swirling Flow
with Processing Vortex Core Based on easurements of Velocity and Local Pressure Fluctuations”. Proc. 11th Int. Symposium on Applications of Laser Techniques Fluid Mechanics, Lisbon, Portugal.
[4] Choi. B., Kim. H. T., 2003. “Flame stability of CO/ H2 syngas in the diffusion flame by using lab-scale burner”. Korean society of environmental Engineers,8, pp. 193-201.
[5] Thummers. M.J., hubner. A.W., Van reen. E.h. and Hanjalick. V.M., 2008. “Hysteresis and transition in swirling nonpremixed flames”. Cambustion and flame,256 (2), pp. 447-459.
[6] Yuassa.S ., 1986. “Effects of swirl on stability of jet Diffusion Flames”. Combustion and Flame, 66,pp.181-192.
[7] Chao, Y. C .,Wu, C. Y., and Lee. k. Y., 2004. “Effects of Dilution on Blow-Out Limits of Turbulent Jet Flames”. Combustion Science and Technology, 176,pp. 1735-1753.
[8] Feikema, D., Chen, R. H., and Driscoll, J. F., 1990.“Enhancement of Blowout Limits by the Use of Swirl”. Combustion and Flame, 80, pp. 183-195
[9] Javareshkian, A., Sarrafan Sadeghi, S., and TabeJamaat,S. 2013. Experimental study of the effect of swirl on the stability of non-premixed combustion of propane/oxygen. 12th Conference of Iranian Aerospace Society,Tehran (In Persian).
[10] Zhao. Z., Yuen. D.W., Leung. C.W and Wong T.T.,2009 , “Thermal performance of a premixed impinging
circular flame jet array with induced-swirl”. Applied Thermal Engineering, 29, pp.159-166.
[11] Frassoldatia. A ., Frigerrioa. S ., Colombob. E .,Inzolib. F ., Faravellia. T,. 2005. “Determination of Nox emissions from strong swirling confined flame With an integrated CFD-base Procedure”. Chemical engineering Science, 60, PP.2851-2869.
Amirkabir Journal of Mechanical Engineering
Volume 48, Issue 3
September 2016
Pages 315-322

Files

Share

How to cite

Statistics