Numerical simulations of a conceptual blade cooling with a working medium

• Autorzy: Rogoziński K. , Nowak G.
• Języki publikacji: EN

Abstrakty

EN

The development of steam power units aims to increase the working steam parameters as they are the main factors that determine the efficiency of energy conversion. Most state of the art units are designed for supercritical steam parameters. However, the temperature level of steam feeding the turbine is limited by thermal strength of the material used to make the machine components. In this situation, using nickel alloys or cooling the elements exposed to the impact of high temperatures could be the appropriate solution. The former is rather expensive and the latter – technically difficult. The cooling option would require that the cooled element should be fed by a steam with a very high pressure and with a lower temperature than the temperature in the machine flow system. This paper presents the concept of using working steam as the cooling medium after it is expanded in a convergent-divergent nozzle. In such a case, the cooling system is very simple and the performed simulations indicate, for example, that the turbine blades may be cooled in this way.

Słowa kluczowe

EN

blade cooling; convergent-divergent nozzle; Laval nozzle; shock wave

PL

chłodzenie łopatek turbiny; dysza zbieżno-rozbieżna; dysza Lavala; fala uderzeniowa

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Computer Assisted Methods in Engineering and Science
• Rocznik: 2015
• Tom: Vol. 22, no. 3
• Strony: 267--278
• Opis fizyczny: Bibliogr. 9 poz., rys., wykr.

Twórcy

autor

Rogoziński K.

• Institute of Power Engineering and Turbomachinery Silesian University of Technology Konarskiego 18, 44-100 Gliwice, Poland

autor

Nowak G.

• Institute of Power Engineering and Turbomachinery Silesian University of Technology Konarskiego 18, 44-100 Gliwice, Poland

Bibliografia

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• [2] X. Liang, W. Wei, G. Tieyu, S. Xiaojun, G. Jinamin, L. Wanyin. Experimental study on cooling performance of a steam-cooled turbine blade with five internal cooling smooth channels. Experimental Thermal and Fluid Science, 58: 180–187, 2014.
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• [4] W. Wróblewski. Numerical evaluation of the blade cooling for the supercritical steam turbine. Applied Thermal Engineering, 51: 953–962, March 2013.
• [5] G. Nowak, W. Wróblewski, I. Nowak. Convective cooling optimization of a blade for a supercritical steam turbine. International Journal of Heat and Mass Transfer, 55: 4511–4520, 2012.
• [6] A. Shapiro. The dynamics and thermodynamics of compressible fluid flow. New York: The Ronald Press Company, 1953.
• [7] F. Menter. Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal, 32: 1598–1605, August 1994.
• [8] M. Jakob. Heat Transfer. New York: John Wiley & Sons Inc., 1949.
• [9] B.H. Dennis, I.N. Egorov, G.S. Dulikravich, S. Yoshimura. Optimization of a large number coolant passages located close to the surface of a turbine blade. ASME Paper GT2003-38051, 2003.