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http://dx.doi.org/10.3795/KSME-A.2013.37.8.1007

Numerical Study of Aerodynamics of Turbine Rotor with Leading Edge Modification Near Hub  

Kim, Dae Hyun (School of Mechanical Engineering, Korea Univ.)
Lee, Won Suk (School of Mechanical Engineering, Korea Univ.)
Chung, Jin Taek (School of Mechanical Engineering, Korea Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.37, no.8, 2013 , pp. 1007-1013 More about this Journal
Abstract
This study aims to analyze the aerodynamics when the geometry of the turbine rotor is modified. The turbine used in this study is a small engine used in the APU of a helicopter. It is difficult to improve the performance of small engines owing to the structural weakness of the blade tip. Therefore, the improvement of the hub geometry is investigated in many ways. The working fluid of a turbine is a high-temperature and high-pressure gas. The heat transfer rate of the turbine surface should be considered to avoid the destruction of blade owing to the heat load. The SST turbulence model gives an excellent prediction of the aerodynamic behavior and heat transfer characteristics when the numerical simulations are compared with the experimental results. In conclusion, the aerodynamic efficiency is improved when a bulbous design is applied to the leading edge near the hub. The endwall loss is reduced by 15%.
Keywords
Gas Turbine; Aerodynamic Efficiency; Rotor; Leading Edge; Modification; Hub; Bulbous Design;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Shama, O.P. and Butler, T.L., 1987. "Predictions of Endwall Losses and Secondary Flows in Axial Flow Turbine Cadcades." ASME Journal of Turbomachinery, Vol. 109, pp. 229-236.   DOI   ScienceOn
2 Azad, GM S., Han, J. C. and Boyle, R., 2000, "Heat Transfer and Pressure Distributions on a Gas Turbine Blade Tip," Trans. of ASME J. of Turbomachinery, 122, pp. 717-724.   DOI   ScienceOn
3 Azad, GM S., Han, J. C. and Boyle, R., 2000, "Heat Transfer and Pressure Distributions on the Squealer Tip of a Gas Turbine Blade," Trans. of ASME J. of Turbomachinery, 122, pp. 725-732.   DOI   ScienceOn
4 Acharya, S., Yang, H., Prakash, C. and Bunker, R., 2003, "Numerical Study of Flow and Heat Transfer in a Blade Tip with Different Leakage Reduction Strategies," ASME paper, No. GT2003-38617.
5 Yang, H., Chem, H. C. and Han, J. C., 2005, "Flow and Heat Transfer Prediction on Turbine Blade and Shroud in a Low Speed Annular Cascade(II)," Trans. Korean Soc. Mech. Eng. B, Vol. 29, pp. 495-503.
6 Kwak, J. S., 2006, "Effect of Blade Tip Geometry on Heat Transfer Coefficients on Gas Turbine Blade Tips and Near Tip Regions," Trans. Korean Soc. Mech. Eng. B, Vol. 30, No. 4, pp. 328-336.   과학기술학회마을   DOI   ScienceOn
7 Dey, D. and Camci, C., 2004, "Tip Desensitization of an Axial Turbine Rotor Using Tip Platform Extensions," VKI Lecture Series, 2004-02.
8 Cengiz C. and Akamol S., 2008, "Pressure Side Tip Platform Extensions for Tip Leakage Control in Axial Turbines," Progress in Computational Fluid Dynamics, Vol. , Nos.
9 Stephens. J., Tomas C. and Morris. S., 2007, "Turbine Blade Tip Leakage Flow Control: Thick/Thin Blade Effects" 45th AIAA Aerospace Sciences Meeting and Exhibit.
10 Sauer, H., Muller, R. and Vogeler, K., 2001, "Reduction of Secondary Flow Losses in Turbine Cascadesby Leading Edge Modifications at the Endwall," Journal of Turbomachinery, Vol. 123, Issue 2, pp. 207-213.   DOI   ScienceOn
11 Moustapha, S. H. and Williamson, R. G., 1986, "Effect of Two Endwall Contours on the Performance of an Annular Nozzle Cascade," AIAA Journal, Vol. 84, No. 9.
12 Morris, A. W. and Hoare, R. G., 1975, "Secondary Loss Measurements in a Cascade of Turbine Blades With Meridional Wall Profiling," ASME Paper, No. 75-WA/GT-13 137-145.
13 Han, S. and Goldstein R. J., 2006, Influence of Blade Leading Edge Geometry on Turbine Endwall Heat(Mass) Transfer, Journal of Fluids Engineering, Vol. 129.
14 Barth, T. J. and Jesperson, D. C., 1989, "The Design and Application of Upwind Schemes on Unstructured Meshes," AIAA Paper 89-0366.
15 Han, S. and Goldstein R. J., 2002, Influence of Blade Leading Edge Geometry on Turbine Endwall Heat(Mass) Transfer, Proceedings of ASME Paper No. GT2002-30353.
16 Mahmood, G. I. and Acharya, S., 2007, "Experimental Investigation of Secondary Flow Structure in a Blade Passage With and Without Leading Edge Fillets," Journal of Fluids Engineering, Vol. 1291.1.