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A Multiple Inlet Swirler for Gas Turbine Combustors

Authors: Yehia A. Eldrainy, Hossam S. Aly, Khalid M. Saqr, Mohammad Nazri Mohd Jaafar

Abstract:

The central recirculation zone (CRZ) in a swirl stabilized gas turbine combustor has a dominant effect on the fuel air mixing process and flame stability. Most of state of the art swirlers share one disadvantage; the fixed swirl number for the same swirler configuration. Thus, in a mathematical sense, Reynolds number becomes the sole parameter for controlling the flow characteristics inside the combustor. As a result, at low load operation, the generated swirl is more likely to become feeble affecting the flame stabilization and mixing process. This paper introduces a new swirler concept which overcomes the mentioned weakness of the modern configurations. The new swirler introduces air tangentially and axially to the combustor through tangential vanes and an axial vanes respectively. Therefore, it provides different swirl numbers for the same configuration by regulating the ratio between the axial and tangential flow momenta. The swirler aerodynamic performance was investigated using four CFD simulations in order to demonstrate the impact of tangential to axial flow rate ratio on the CRZ. It was found that the length of the CRZ is directly proportional to the tangential to axial air flow rate ratio.

Keywords: Swirler, Gas turbine, CFD, Numerical simulation, Recirculation zone, Swirl number

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1085796

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References:


[1] A. H. Lefebvre, Gas turbine combustion. Hemisphere Publishing Corporation, first edition, 1983.
[2] M. Mellor, Design of Modern gas Turbine Combustors, Academic Press, 1990.
[3] Y. Wang, V. Yang, and R.A. Yetter, Numerical Study on Swirling Flow in an Cylindrical Chamber, 42nd AIAA Aerospace Sciences Meeting, Reno, Nevada, 2004.
[4] Beer, J.M. and Chigier, N.A. (1972). Combustion Aerodynamics. Applied Science Publisher, London
[5] Syred, N., Beer, J.M. (1974). Combustion in Swirling Flows: A Review. Combustion and Flame, 23, pp. 143-201
[6] Gupta, A.K., Lilley, D.G. and Syred, N. (1984). Swirl Flows. Abacus Press, Tunbridge Wells, England.
[7] Sloan, D.G., Smith, P.J. and Smoot, L.D. (1986). Modelling of Swirl in Turbulent Flow System. Prog. Energy Combust. Sci, Vol 12, pp. 163- 250.
[8] B. E. Launder and D. B. Spalding. Lectures in Mathematical Models of Turbulence. Academic Press, London, England, 1972.
[9] B. E. Launder and D. B. Spalding. The Numerical Computation of Turbulent Flows. Computer Methods in Applied Mechanics and Engineering, 3:269-289, 1974.
[10] FLUENT 6.3 User's Guide, Fluent Inc. 2006.
[11] Dynamics Jiyuan, T., Guan, H. Y., Chaoqun, L., 2008 Computational Fluid: A Practical Approach, Butterworth-Heinemann Piblishing, pp 163-175.
[12] Versteeg, H.K. and Malalasekera, W., 1995, An Introduction to Computational Fluid Dynamics, the Finite Volume Method", Longman Group Ltd.
[13] Lucca-Negro and O-Doherty, 2001 O. Lucca-Negro and T. O-Doherty, Vortex breakdown: a review, Progress in Energy and Combustion Science 27 (2001), pp. 431-481.