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 - Conference Paper (international conference)
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]
R&D Projects: GA AV ČR IAA200760905; GA ČR(CZ) GAP101/11/1593; GA MŠMT LA09011
Institutional research plan: CEZ:AV0Z20760514
Keywords : steam turbine * equation of state * computational fluid dynamics
Subject RIV: BJ - Thermodynamics

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.
Permanent Link: http://hdl.handle.net/11104/0006693