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Original title:
A computationally efficient and accurate numerical representation of thermodynamic properties of steam condensing steam flow in steam turbines
Authors: Hrubý, Jan
Document type: Papers
Conference/Event: Experimental Fluid Mechanics 2011, Jičín (CZ), 2011-11-22 / 2011-11-25
Year: 2011
Language: eng
Abstract: 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.
Keywords: computational fluid dynamics; equation of state; steam turbine
Project no.: CEZ:AV0Z20760514 (CEP), IAA200760905 (CEP), GAP101/11/1593 (CEP), LA09011 (CEP)
Funding provider: GA AV ČR, GA ČR, GA MŠk
Host item entry: International Conference Experimental Fluid Mechanics 2011, ISBN 978-80-7372-784-0
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0006693
Permalink: http://www.nusl.cz/ntk/nusl-80942
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Hrubý, Jan
Document type: Papers
Conference/Event: Experimental Fluid Mechanics 2011, Jičín (CZ), 2011-11-22 / 2011-11-25
Year: 2011
Language: eng
Abstract: 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.
Keywords: computational fluid dynamics; equation of state; steam turbine
Project no.: CEZ:AV0Z20760514 (CEP), IAA200760905 (CEP), GAP101/11/1593 (CEP), LA09011 (CEP)
Funding provider: GA AV ČR, GA ČR, GA MŠk
Host item entry: International Conference Experimental Fluid Mechanics 2011, ISBN 978-80-7372-784-0
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0006693
Permalink: http://www.nusl.cz/ntk/nusl-80942
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2012-01-11, last modified 2024-01-26