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Calculations of the condensing water steam flows in turbine blade cascades

Wróblewski W.

Turbulence : international journal

2000

Vol. 6-7

209-223

This paper describes modelling of two- and three-dimensional flows with homogeneous condensation. It needs a simultaneous solution of a differential governing equations (continuity, momentum and energy- equations) and differential equation of condensate formation. It was assumed that flow is inviscid, the velocity slip between the vapour and liquid droplets is neglected. The formation of the liquid phase is calculated using classical nucleation theory. Superheated and subcooled steam parameters are computed from a virial non-linear equation of state. The influence of correction methods and droplet growth models is discussed. The finite volume cell centred calculation method is used. The solution procedure is based on the upwind Godunov-type scheme adapted to the real gas problems. Presented algorithm is capable to investigate unsteady condensation phenomena in the flow. The computational results of the two-phase flow modelling with condensation through a turbine cascade are presented. For the turbine stator of the steam turbine the 3-D flow structure is described.