Simulation of the flow inside an annular can combustor

  • Abstract
  • Keywords
  • References
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  • Abstract

    In the gas turbine combustion system, the external flows in annuli play one of the key roles in controlling pressure loss, air flow distribution around the combustor liner, and the attendant effects on performance, durability, and stability. This paper describes a computational fluid dynamics (CFD) simulation of the flow in the outer annulus of a can combustor. Validating this simulation was done with experimental results obtained from analyzing the flow inside a can combustor annulus that was used in a Babylon/Iraq gas turbine power station. Pitot static tubes were used to measure the velocity in ten stations in the annular region. By using the velocity profile for comparison, a good agreement between the CFD simulation and experimental work was observed.


    R: radius of combustor (mm)

    r: local radius (mm)

    Pt: total pressure (Pascal)

    Ps: static pressure (Pascal)

    DG: damp gap (mm)

    X/Dc: axial distance is normalized with the diameter of the casing as the origin.

    A, B and L: station of measurement and investigated locations.

    u: local axial velocity

    U: mass average axial velocity at inlet

    Keywords: Annulus Flow, Can Combustor, CFD Simulation, Pitot Static Tube, Velocity Profile.

  • References

    1. Koutmos, P. and McGuirk, J.J. (1989), Isothermal flow in a gas-turbine combustora benchmark experimental study. Experiments in Fluids 7(5), pp. 344-354.
    2. Fishenden, C.R. and Stevens, S.J. (1977), Performance of annular combustor dump diffusers, Journal of Aircraft, 14(1), pp. 60-67.
    3. Wennerberg, D. and Obi, S. (1993), Prediction of strongly swirling flows in quarl expansions with a non-orthogonal finite-volume method and a second-moment turbulence closure. In: Rodi, W. and Martelli, F. (eds.) Engineering Turbulence Modelling and Experiments, vol. 2, pp. 197-206. ISBN 0444898026.
    4. Mohan, R., Singh, S.N. and Agrawal, D.P. (1995), Flow split in a reverse flow combustor, Proceedings of the 22nd National Conference on Fluid Mechanics & Fluid power (IIT, Madras), 182-186.
    5. Garg, G., Bharani, S., Singh, S.N. and Seshadri, V. (2011), Flow characteristics around the liner of an annular gas turbine combustor model, Proceedings of the 28th National Conference on Fluid Mechanics & Fluid Power (PEC, Chandigarh) 13-15 Dec, pp. 3-11.
    6. Miao, Jr. M. and Wu, C-Y. (2006), Numerical approach to hole shape effect on film cooling effectiveness over flat plate including internal impingement cooling chamber. International Journal of Heat and Mass Transfer, 49, pp. 919-938.
    7. Barringer, M., Richard, O., Stitzel, S., Walter, J. and Thole, K. (2002), "Flow Field Simulations of a Gas Turbine Combustor," Journal of Turbo Machinery, 124, pp. 508-516.
    8. Holdeman, J.D. (1993), Mixing of Multiple Jets with a Confined Subsonic Crossflow, Progress in Energy and Combusion Science, 19, pp. 31-70, 60-67.
    9. Alkhafagiy, D. and Rahim, A. (2007), Application of CFD in combustor design technology, National Conference on State of Art Technologies in Mechanical Engineering, STEM, and pp. 311-316.
    10. Rahim, A., Singh, S.N. and Veeravalli, S.V. (2007), Liner dome shape effect on the annulus flow characteristics with and without swirl for a can combustor, Journal of Power and Energy, IMech, 221, Part A.




Article ID: 2499
DOI: 10.14419/ijet.v3i3.2499

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