Numerical calculation of the expansion flow with spontaneous condensation in water vapour and moist air

A method for solving an expansion flow of the water steam and moist air is presented in the paper. The phenomenon of the homogenous condensation is also calculated. The gas is governed by the Euler equation, which are coupled with the system of partial differential equation describing the liquid phase. There is no slip between gas and water droplets. In this paper the real water vapour properties and functions in all regions were considered. It makes possible to model the condensation process more accurate. All governing equations are discretised by the cell-centered finite volume formulation. The numerical procedure is based on an explicit Godunov-type scheme. The method has been extensively tested including a one dimension test called the shock tube test, the expansion flow through a Laval nozzle and flow through the blade cascade of a turbine stator.