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Abstrakty
The aim of presented research is to estimate the losses in the flow of steam through the rotor of last stage LP steam turbine. In this case two types of losses may take place, namely aerodynamic (profile, secondary flow, leakage) and thermodynamic (due to the heat addition caused by condensation). In the paper three different calculation models have been compared. The first one is the streamline curvature method (SCM), used on the meridional plane with correlation of losses, and the other are based on the Reynolds averaged Navier-Stokes governing equations. The N-S equations for the 3D steam flow are solved using two models for the liquid phase. The first one is an equilibrium dry/wet steam model and the second one is the nonequillibrium model. In this case, the governing equations are coupled with the system of partial differential equations describing the liquid phase. The real gas local equation of state is used in calculation of the water-steam properties and thermodynamic functions. The homogeneous nucleation processes in the water steam are modeled using the classical nucleation theory. Flow in the considered case has strong 3-D character and real gas effects are significant, which causes significant losses in the last stages. The results of calculations of the wet steam flow are discussed and compared.
Słowa kluczowe
Rocznik
Tom
Strony
119--128
Opis fizyczny
Bibliogr. 19 poz., wykr.
Twórcy
autor
- Institute of Power Engineering and Turbomachinery Silesian University of Technology, Konarskiego 18, 44-101 Gliwice, Poland
autor
- Institute of Power Engineering and Turbomachinery Silesian University of Technology, Konarskiego 18, 44-101 Gliwice, Poland
autor
- Institute of Power Engineering and Turbomachinery Silesian University of Technology, Konarskiego 18, 44-101 Gliwice, Poland
autor
- Institute of Power Engineering and Turbomachinery Silesian University of Technology, Konarskiego 18, 44-101 Gliwice, Poland
Bibliografia
- [1] Dibelius G. H., Mertens K., Pitt R. U., Strauf, E.: Investigation ofwet steam flow in turbines. Proceedings Inst. Mech. Engrs., Conf. on Turbomachinery-Emciency, Prediction and Improvement, Cambridge 1987, 135-143.
- [2] Vomela J.: Expeńmental research of turbinę stages, Power Machines 2002, Conf. WBU in Pilsen, June 2002.
- [3] Bohn D., Holzenthal K.: Measumerent of the wetness fraction and droplet size distribution in a condensation turbine, Proceedings, 2nd European Conf. on Turbomachinery, Antwerpen 1997, 55-63
- [4] Bohn D., Surken N., Kreitmeier F.-. Nucleation phenomenain a multi-stage Iow pressure steam turbine, 5-th European Conf. on Turbomachinery, Prague 2003.
- [5] Lampart P.: Numerical optimization of SD blading in the LP exit stage of steam turbinę for different load conditions, 5-th European Conf. on Turbomachinery, Prague 2003.
- [6] Lampart P, Gardzilewicz A.: Numerical study of 3D blading in HP impulse turbines, Cieplne Maszyny Przepływowe (Turbomachinery), Vol. 115, 1999, 297-310.
- [7] Aleksejeva R. N., Bojowa E. A.: Approońmate method of calculation of the energy losses in the blade cascade. Teploenergetika. 12 (1973), 21-25 (in Rus-sian).
- [8] Chmielniak T., Łukowicz H.: Investigations of flows under varying load con¬ditions of bladding systems, Bulletin of Silesian University of Technology, z. 126, Gliwice 1995, (in Polish).
- [9] Craig H. R. M., Cox H. J. A.: Performance estimation of axial flow turbines, Journal of the Inst. of Mech. Eng., Vol. 32, 1970-71, 407-424
- [10] Krzyżanowski J. et al: Aerodynamic of the last stages of the steam turbines-experimental and theoretical investigations of the flow. Report IMP-PAN, Nr 309/90, Gdańsk 1990 (in Polish)
- [11] Traupel W.: Thermische Turbomaschinen, Bd. 1, Springer Verlag 1978
- [12] CFX-Tascflow, theory documentation, (2001), Version 2.11, AEA Technology Canada.
- [13] Menter F. R.: Two-equation eddy-viscosity turbulence models for engineering applications, AIAA J., 32 (1994), 1598-1605
- [14] Menter F. R.: A comparison of Some Recent Eddy-Viscosity Turbulence Models, J. Fluids Eng., 118 (1996), 514-519
- [15] Garg V. K., and Ameri A. A.: Two-equation turbulence models for prediction of heat transfer on a transonic turbine blade, Int. Journal of Heat and Fluid Flow, 22 (2001), 593-602
- [16] Frenkel J.: Kinetic Theory of Liquids, Dover Publ., New York 1955
- [17] Fuchs N. A., Satugin A. G.: High Dispered Aerosols, Topics in Current Aerosols Research, Eds G. M Hidy J. R. Brock, Pergamon Press, London 1971
- [18] Dykas S.: Numerical calculation of the steam condensign flow, Task Quarterly, Scientific Bulletin of Academic Computer Centre in Gdańsk, Vol. 5 (2001), No 4, Gdańsk.
- [19] Wróblewski W.: Numerical simulation of flow phenomena in stam turbines Bulletin of Silesian University of Technology, series: Power Engineering 2000, 132, (in Polish)
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWM2-0022-0010