TRANSACTIONS OF THE INSTITUTE OF FLUID-FLOW MACHINERY No. 113, 2003, 157-168 ANDRZEJ. GARDZILEWICZ a* , JERZY ŚWIRYDCZUK a , JANUSZ BADUR b , MICHAŁ KARCZ b , ROBERT WERNER c and CZESŁAW SZYREJKO c Methodology of CFD computations applied for analysing flows through steam turbine exhaust hoods a Turbine Aerodynamics Department, Institute of Fluid Flow Machinery, Polish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland, b Thermo-Chemical Power Department, Institute of Fluid-Flow Machinery, Pol- ish Academy of Sciences, Fiszera 14, 80-231 Gdańsk, Poland, c ALSTOM Power Ltd, Elbląg, Poland Abstract In the paper three different approaches and different methods of the last stage and exhaust hood calculations are presented and discussed in details. Results of our investigations have been implemented in Polish power plants, another are under development. Keywords: Steam turbine, Exhaust hood; CFD computation 1 Introduction Non-symmetrical flow of steam at a steam turbine exit is one of the most challenging problems in fluid dynamics [1, 2]. An exhaust hood has a complex geometry, in which the flow changes direction by 90 o , as well as a complex set of flow properties, including: • viscosity, • compressibility and shock waves, • heat transfer with phase transition, • changing thermodynamic properties of the steam at the presence of water, * Corresponding author. E-mail address: gar@imp.gda.pl