Numerical analysis of the impact of pollutants on water vapour condensation in atmospheric air transonic flows

The paper presents a developed numerical tool in the form of a CFD code solving Reynolds-averaged Navier-Stokes equations for transonic flows of a compressible gas which is used to model the process of atmospheric air expansion in nozzles. The numerical model takes account of condensation of water vapour contained in atmospheric air. The paper presents results of numerical modelling of both homo- and heterogeneous condensation taking place as air expands in the nozzle and demonstrates the impact of the air relative humidity and pollutants on the condensation process.