Significant of Isothermal Flow Studies for High Swirling Flow in Unconfined Burner

Abstract:

This paper is presents numerical simulation of isothermal swirling turbulent flows in a combustion chamber of an unconfined burner. Isothermal flows of with three different swirl numbers, S_N of axial swirler are considered to demonstrate the effect of flow axial velocity and tangential velocity to define the center recirculation zone. The swirler is used in the burner that significantly influences the flow pattern inside the combustion chamber. The inlet velocity, U₀ is 30 m/s entering into the burner through the axial swirler that represents a high Reynolds number, R_e to evaluate the differences of S_N. The significance of center recirculation zone investigation affected by differences R_e also has been carried out in order to define a good mixing of air and fuel. A numerical study of non-reacting flow into the burner region is performed using ANSYS Fluent. The Reynolds–Averaged Navier–Stokes (RANS) realizable k-ε turbulence approach method was applied with the eddy dissipation model. An attention is focused in the flow field behind the axial swirler downstream that determined by transverse flow field at different radial distance. The results of axial and tangential velocity were normalized with the U₀. The velocity profiles’ behaviour are obviously changes after existing the swirler up to x/D = 0.3 plane. However, their flow patterns are similar for all S_N after x/D = 0.3 plane towards the outlet of a burner.

• Periodical: Applied Mechanics and Materials (Volumes 789-790)
• Pages: 477-483
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.789-790.477
• Online since: September 2015
• Authors: A.R. Norwazan, M.N. Mohd Jaafar
• Keywords: Axial Velocity, Burner, Realizable K-ε, Swirling Flow, Tangential Velocity

References

[1] M.N. Mohd Jaafar, K. Jusoff, M.S. Osman, and M.S.A. Ishak, Combustor Aerodynamics Using Radial Swirler, International Journal of Physics Sciences, Vol. 6, No. 13, pp.3091-3098, (2011).

[2] A. Ridluan, S. Eiamsa-ard, and P. Promvonge, Numerical simulation of 3D turbulent isothermal flow in a vortex combustor. International Communication in Heat and Mass Transfer 34 (2007) 860-869.

DOI: 10.1016/j.icheatmasstransfer.2007.03.021

[3] I.V. Litvinov, S.I. Shtork, P.A. Kuibin, S.V. Alekseenko, and K. Hanjalic, Experimental study and analytical reconstruction of processing vortex in a tangential swirler, International Journal of Heat and Fluid Flow 42 (2013) 251–264.

DOI: 10.1016/j.ijheatfluidflow.2013.02.009

[4] N. Syred, and J.M. Beer, Combustion in Swirling Flows: A Review, Combustion and Flame 23, 143-201 (1974).

DOI: 10.1016/0010-2180(74)90057-1

[5] D.G. Sloan, P.J. Smith, and L.D. Smoot, Modeling of swirl in turbulent flow systems. Prog. Energy Combustion Science, 1986, Vol. 12, pp.163-250.

DOI: 10.1016/0360-1285(86)90016-x

[6] B.F. Magnussen, and B.H. Hjertager, On mathematical modeling of turbulent combustion with special emphasis on soot formation and combustion, 16th Symposium (International) on Combustion, Combustion Institute, pp.719-729, (1976).

DOI: 10.1016/s0082-0784(77)80366-4

[7] L. Zhuowei, N. Kharoua, H. Redjem, and L. Khezzar, RANS and LES simulation of a swirling flow in a combustion chamber with different swirl intensities, Proceedings ICHMT International Symposium on Advances in Computational Heat Transfer (2012).

DOI: 10.1615/ichmt.2012.cht-12.1030

[8] M. L. Mathur, and N. R. L. MacCallum, Swirling Air Jets Issuing from Vane Swirlers. Part 1: Free Jets, Journal of the Institute of Fuel, Vol. 40, 214 – 22, (1967).

[9] R. Palm, S. Grundmann, M. Weismuller, S. Saric, S. Jakirlic, and C. Tropea, Experimental characteristization and modeling of inflow conditions for a gas turbine swirl combustor, International Journal of Heat and Fluid Flow 01/(2006).

DOI: 10.1016/j.ijheatfluidflow.2006.03.016

[10] Y.A. Eldrainy, K.M. Saqr, H.S. Aly, and M.N. Mohd Jaafar, CFD insight of the flow dynamics in a novel swirler for gas turbine combustors, International Communications in Heat and Mass Transfer 36 (2009) 936–941.

DOI: 10.1016/j.icheatmasstransfer.2009.06.013

[11] A.E.E. Khalil, and A.K. Gupta, Distributed swirl combustion for gas turbine application, Applied Energy 88 (2011) 4898–4907.

DOI: 10.1016/j.apenergy.2011.06.051

[12] S. Murphy, R. Delfos, , M.J.B.M. Pourquie, Z. Olujic, , Jansens, P.J., and Nieuwstadt, F.T.M. Prediction of strongly swirling flow within an axial hydrocyclone using two commercial CFD codes, Chemical Engineering Science 62 (2007) 1619-1635.

DOI: 10.1016/j.ces.2005.10.031

[13] N. Syred, M. Abdulsada, A. Griffiths, T.O. Doherty, and Bowen, The effect of hydrogen containing fuel blends upon flashback in swirl burners, Applied Energy 89 (2012) 106–110.

DOI: 10.1016/j.apenergy.2011.01.057

[14] N. Grech, , C. Koupper, P.K. Zachos, V. Pachidis, and R. Singh, Consideration on the numerical modeling and performance of axial swirlers under relight conditions, Journal of Engineering for Gas Turbines and Power, (2012).

DOI: 10.1115/1.4007132

[15] S.A. Hashemi, A. Fattahi, G.A. Sheikhzadeh, and M.A. Mehrabian, Investigation of the effect of air turbulence intensity on NOx emission in non-premixed hydrogen and hydrogen hydrocarbon composite fuel combustion, International Journal of Hydrogen Energy 36 (2011).

DOI: 10.1016/j.ijhydene.2011.05.002

[16] L. Anetor, E. Osakue, and C. Odetunde, Reduced mechanism approach of modeling premixed propane-air mixture using ANSYS Fluent, Engineering Journal, Vol. 16, No. 1. (2012).

DOI: 10.4186/ej.2012.16.1.67

[17] O.A. Marzouk and E.D. Huckaby, Simulation of a swirling gas-particle flow using different k-epsilon models and particle-parcel relationships, Engineering Letter, 18: 1. (2010).

[18] J.L. Xia, G. Yadigaroglu, Y.S. Liu, J. Schmidli, and B.L. Smith, Numerical and experimental study of swirling flow in a model, Int. Journal Heat Mass Transfer, Vol. 41, No. 11 pp.1485-1497, (1998).

DOI: 10.1016/s0017-9310(97)00239-1