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A computationally efficient and accurate numerical representation of thermodynamic properties of steam condensing steam flow in steam turbines
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SYSNO ASEP 0367960 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title A computationally efficient and accurate numerical representation of thermodynamic properties of steam condensing steam flow in steam turbines Author(s) Hrubý, Jan (UT-L) RID, ORCID Number of authors 1 Source Title International Conference Experimental Fluid Mechanics 2011, 1. - Liberec : TU Liberec, 2011 / Vít T. ; Dančová P. ; Novotný P. - ISBN 978-80-7372-784-0 Pages s. 177-186 Number of pages 10 s. Publication form CD ROM - CD ROM Action Experimental Fluid Mechanics 2011 Event date 22.11.2011-25.11.2011 VEvent location Jičín Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords steam turbine ; equation of state ; computational fluid dynamics Subject RIV BJ - Thermodynamics R&D Projects IAA200760905 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GAP101/11/1593 GA ČR - Czech Science Foundation (CSF) LA09011 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z20760514 - UT-L (2005-2011) Annotation Mathematical modeling of the non-equilibrium condensing transonic steam flow in the complex 3D geometry of a steam turbine is a demanding problem both concerning the physical concepts and the required computational power. Available accurate formulations of steam properties IAPWS-95 and IAPWS-IF97 require much computation time. For this reason, the modelers often accept the unrealistic ideal-gas behavior. Here we present a computation scheme based on a piecewise, thermodynamically consistent representation of the IAPWS-95 formulation. Density and internal energy are chosen as independent variables to avoid variable transformations and iterations. On the contrary to the previous Tabular Taylor Series Expansion Method, the pressure and temperature are continuous functions of the independent variables, which is a desirable property for the solution of the differential equations of the mass, energy, and momentum conservation for both phases. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2012
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