The mathematical approach used for the condensation of flowing steam is based on the homogeneous condensation and on the binary nucleation of water droplets with a representative chemical impurity NaCl. The physical and mathematical models are briefly described. The homogeneous and binary nucleation numerical models are then used for the calculation of steam flow with condensation in the 2D nozzle-blade cascades of the first wet stage of the low-pressure part of a fossil-fuelled condensing steam turbine and of a similar cascade of the LP part of a nuclear turbine. Main results of the calculations are presented and analyzed. It was used humid air for experimental investigation some phenomena of the two-phase flow, e. g. modelling water steam condensation in the flow in LP nozzle cascade of a steam turbine.

Topics
Chemical impurities, Fossil fuels, Numerical methods, Mathematical modeling, Multiphase flows
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