On the internal efficienty of a turbine stage: classical and computational fuid dynamics definitions

• Autorzy: Nastałek L. , Karcz M. , Sławiński D. , Zakrzewski W. , Ziółkowski P. , Szyrejko C. , Topolski J. , Werner B. , Badur J.
• Języki publikacji: EN

Abstrakty

EN

Almost entire fleet of steam turbines in Poland was designed between 1950_1980 with the use of the so-called zero-dimensional (0D) calculation tools. For several years, design and modernization of the turbines occur in assistance with the state-of-the-art methods that describe working fluid flow field based on three-dimensional (3D) models and computational fluid dynamics (CFD) codes. This cooperation between 0D and 3D codes requires exchange of overall, integral information such as: power, efficiency, heat and mass fluxes. In consequence the question arises regarding the cohesion of definitions, and particularly regarding the correctness of the definition for internal efficiency of the turbine's stage and the turbine as a whole. In the present paper we formulate basic definitions reason of efficiency that are naturally adapted to the numerical 0D and 3D models. We show that the main reason of differences between the definitions in 0D and 3D is the definition of the theoretical work of the stage lt. In the classical 0D models, mostly employed is the isentropic approach, and hence the isentropic efficiency occurs. Meanwhile, in the increasingly common 3D approach (most likely by CFD), we use more physically correct pathway by subtracting energy loss from the available energy, that leads to the polytropic definition of efficiency. We show an example of computing the efficiency and the 3D losses, denoted with additional subscript CFD, we also discuss benefits of this definition in comparison with the isentropic classical definition in 0D.

Słowa kluczowe

EN

turbine stage; stage power; stage efficiency; losses

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2012
• Tom: nr 124
• Strony: 17--39
• Opis fizyczny: Bibliogr. 27 poz., rys., tab.

Twórcy

autor

Nastałek L.

• The Szewalski Institute of Fluid-Flow Machinery of the Polish Academy of Sciences, Centre for Thermomechanics of Fluids, Energy Conversion Department, Fiszera 14, 80-231 Gdańsk, Poland

autor

Karcz M.

• The Szewalski Institute of Fluid-Flow Machinery of the Polish Academy of Sciences, Centre for Thermomechanics of Fluids, Energy Conversion Department, Fiszera 14, 80-231 Gdańsk, Poland

autor

Sławiński D.

• The Szewalski Institute of Fluid-Flow Machinery of the Polish Academy of Sciences, Centre for Thermomechanics of Fluids, Energy Conversion Department, Fiszera 14, 80-231 Gdańsk, Poland

autor

Zakrzewski W.

• The Szewalski Institute of Fluid-Flow Machinery of the Polish Academy of Sciences, Centre for Thermomechanics of Fluids, Energy Conversion Department, Fiszera 14, 80-231 Gdańsk, Poland

autor

Ziółkowski P.

• Conjoint Doctoral School at the Faculty of Mechanical Engineering, Gdańsk University of Technology, Narutowicza 11/12 80-233 Gdańsk, Poland

autor

Szyrejko C.

• ALSTOM Power Ltd., Stoczniowa 2, 82-300 Elbląg, Poland

autor

Topolski J.

• ALSTOM Power Ltd., Stoczniowa 2, 82-300 Elbląg, Poland

autor

Werner B.

• ALSTOM Power Ltd., Stoczniowa 2, 82-300 Elbląg, Poland

autor

Badur J.

• ALSTOM Power Ltd., Stoczniowa 2, 82-300 Elbląg, Poland

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