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Effects of alternating elliptical chamber on jet impingement heat transfer in vane leading edge under different cross-flow conditions

Published online by Cambridge University Press:  30 April 2021

K. Xiao ,
J. He  and
Z. Feng Open the ORCID record for Z. Feng [Opens in a new window]
K. Xiao
Affiliation:
Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment Institute of Turbomachinery, School of Energy and Power Engineering Xi’an Jiaotong University Xi’an, Shaanxi China
J. He
Affiliation:
Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment Institute of Turbomachinery, School of Energy and Power Engineering Xi’an Jiaotong University Xi’an, Shaanxi China
Z. Feng*
Affiliation:
Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment Institute of Turbomachinery, School of Energy and Power Engineering Xi’an Jiaotong University Xi’an, Shaanxi China
*
zpfeng@mail.xjtu.edu.cn
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Abstract

This paper proposes an alternating elliptical impingement chamber in the leading edge of a gas turbine to restrain the cross flow and enhance the heat transfer, and investigates the detailed flow and heat transfer characteristics. The chamber consists of straight sections and transition sections. Numerical simulations are performed by solving the three-dimensional (3D) steady Reynolds-Averaged Navier–Stokes (RANS) equations with the Shear Stress Transport (SST) k– $\omega$ turbulence model. The influences of alternating the cross section on the impingement flow and heat transfer of the chamber are studied by comparison with a smooth semi-elliptical impingement chamber at a cross-flow Velocity Ratio (VR) of 0.2 and Temperature Ratio (TR) of 1.00 in the primary study. Then, the effects of the cross-flow VR and TR are further investigated. The results reveal that, in the semi-elliptical impingement chamber, the impingement jet is deflected by the cross flow and the heat transfer performance is degraded. However, in the alternating elliptical chamber, the cross flow is transformed to a pair of longitudinal vortices, and the flow direction at the centre of the cross section is parallel to the impingement jet, thus improving the jet penetration ability and enhancing the impingement heat transfer. In addition, the heat transfer in the semi-elliptical chamber degrades rapidly away from the stagnation region, while the longitudinal vortices enhance the heat transfer further, making the heat transfer coefficient distribution more uniform. The Nusselt number decreases with increase of VR and TR for both the semi-elliptical chamber and the alternating elliptical chamber. The alternating elliptical chamber enhances the heat transfer and moves the stagnation point up for all VR and TR, and the heat transfer enhancement is more obvious at high cross-flow velocity ratio.

Keywords

Gas turbineVane leading edgeImpingement coolingCross flowAlternating elliptical chamber
Type
Research Article
Information
The Aeronautical Journal , Volume 125 , Issue 1291: The 25th ISABE Conference Special Issue – Part I , September 2021 , pp. 1484 - 1500
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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References

REFERENCES

Han, J.C., Dutta, S. and Ekkad, S.V. Gas Turbine Heat Transfer and Cooling Technology, Taylor & Francis Books, 2000.Google Scholar
Metzger, D.E. and Korstad, R.J. Effects of crossflow on impingement heat transfer, ASME J Eng Gas Turbines Power, 1972, 94, (1), pp 35–41.CrossRefGoogle Scholar
Goldstein, R.J. and Behbahani, A.I. Impingement of a circular jet with and without cross flow, Int J Heat Mass Transf, 1982, 5, (25), pp 1377–1382.CrossRefGoogle Scholar
Taslim, M.E. and Bethka, D. Experimental and numerical impingement heat transfer in an airfoil leading edge cooling channel with cross-flow, ASME J Turbomach, 2009, 131, (1), p 011021.CrossRefGoogle Scholar
Chi, Z., Kan, R., Ren, J. and Jiang, H. Experimental and numerical study of the anti-crossflows impingement cooling structure, Int J Heat Mass Transf, 2013, 64, pp 567–580.CrossRefGoogle Scholar
Wang, C.L., Wang, L. and Sunden, B. Effects of a vortex generator pair on jet impingement heat transfer in cross-flow, ASME Paper GT2015-42236, 2015.CrossRefGoogle Scholar
Wang, C.L., Wang, L. and Sunden, B. A novel control of jet impingement heat transfer in cross-flow by a vortex generator pair, Int J Heat Mass Transf, 2015, 88, pp 82–90.CrossRefGoogle Scholar
Wang, C.L., Luo, L., Wang, L. and Sunden, B. Heat transfer and fluid flow of a single jet impingement in crossflow modified by a vortex generator pair, ASME Paper GT2016-56894, 2016.CrossRefGoogle Scholar
Wang, C.L., Luo, L., Wang, L. and Sunden, B. Effects of vortex generators on the jet impingement heat transfer at different cross-flow Reynolds numbers, Int J Heat Mass Transf, 2016, 96, pp 278–286.CrossRefGoogle Scholar
Meng, J.A., Liang, X.G., Li, Z.X. and Guo, Z.Y. Numerical study on low Reynolds number convection in alternate elliptical axis tube, J Enhanced Heat Transf, 2004, 11, (4), pp 307–313.CrossRefGoogle Scholar
Meng, J.A., Liang, X.G., Chen, Z.J. and Li, Z.X. Experimental study on convective heat transfer in alternating elliptical axis tubes, Exp Ther Fluid Sci, 2005, 29, (4), pp 457–465.CrossRefGoogle Scholar
Chen, W.L., Guo, Z.Y. and Chen, C.K. A numerical study on the flow over a novel tube for heat-transfer enhancement with a linear eddy-viscosity model, Int J Heat Mass Transf, 2004, 7, (14–16), pp 3431–3439.CrossRefGoogle Scholar
Li, B., Feng, B., He, Y.L. and Tao, W.Q. Experimental study on friction factor and numerical simulation on flow and heat transfer in an alternating elliptical axis tube, Appl Ther Eng, 2006, 26, (17–18), pp 2336–2344.CrossRefGoogle Scholar
Sajadi, A.R., Yamani, D.S.S., Ashtiani, D. and Kowsari, F. Experimental and numerical study on heat transfer and flow resistance of oil flow in alternating elliptical axis tubes, Int J Heat Mass Transf, 2014, 77, pp 124–130.CrossRefGoogle Scholar
Hasan, N.K., and Hamid, R.N. The effect of multi-longitudinal vortex generation on turbulent convective heat transfer within alternating elliptical axis tubes with various alternative angles, Case Stud Ther Eng, 2018, 12, pp 237–247.Google Scholar
Khaboshan, H.N. and Nazif, H.R. Entropy generation analysis of convective turbulent flow in alternating elliptical axis tubes with different angles between pitches; a numerical investigation, Heat Mass Transf, 2019, 55, pp 2857–2872.CrossRefGoogle Scholar
Xiao, K., Wang, X.Y. and Feng, Z.P. Study on flow and heat transfer in cross-torsion elliptical cooling channel, J Eng Thermophys, 2019, 40, (11), pp 2526–2531 (in Chinese).Google Scholar
Xiao, K., He, J. and Feng, Z.P. Study on flow and heat transfer characteristics of a new-proposed alternating elliptical U-Channel in the mid-chord region of gas turbine blade, ASME J Eng Gas Turb Power, 2021, 143, (5), p 051025.CrossRefGoogle Scholar
Xing, Y., Spring, S. and Weigand, B. Experimental and numerical investigation of heat transfer characteristics of inline and staggered arrays of impinging jets, ASME J Heat Transf, 2010, 132, (9), pp 53–58.CrossRefGoogle Scholar