It was proved that the dispersivity of the liquid phase and the cascade flow coefficient depend strongly upon the location of the liquid phase production in the flow parts of a turbine. It was established that an essential decrease of the flow occurs if the condensation takes place inside the nozzle cascade channels. 

Large droplets deveiop in principle as a result of accumulation and subsequent coagulation of small droplets on the blading surfaces. The liquid pha§e at the turbine outlet  can contain as much as 10 - 20 percent in mass of large droplets. Separation of the liquid phase is the most effective method of reducing blade erosion and increasing the turbine efficiency. Values of the separation coefficients do not usually axceed 10 peicent. However, especially designed separating stages allow 3 -5  fold increase of the separation coefficient, The analysis of the liquid phase motion in the flow parts of turbines and the statistical processing of operating conditions of turbines has led to the development of the methodics, as proposed in the paper, of calculations of the blading erosion rate.