A computationally efficient and accurate numerical representation of thermodynamic properties of steam condensing steam flow in steam turbines

0367960 - ÚT 2012 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Hrubý, Jan
A computationally efficient and accurate numerical representation of thermodynamic properties of steam condensing steam flow in steam turbines.
International Conference Experimental Fluid Mechanics 2011. Vol. 1. Liberec: TU Liberec, 2011 - (Vít, T.; Dančová, P.; Novotný, P.), s. 177-186. ISBN 978-80-7372-784-0.
[Experimental Fluid Mechanics 2011. Jičín (CZ), 22.11.2011-25.11.2011]
Grant CEP: GA AV ČR IAA200760905; GA ČR(CZ) GAP101/11/1593; GA MŠMT LA09011
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: steam turbine * equation of state * computational fluid dynamics
Kód oboru RIV: BJ - Termodynamika

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.
Trvalý link: http://hdl.handle.net/11104/0006693