Kovalsky A. Development of the theory of drop-impact erosion and creation of the effective antierosive protection of movable blades of steam turbines

The object of the investigation - a movable blade of last stage of a power steam turbine. The aim of the investigation - improving of methods of anti-erosive protection of movable blades of last stages CLP power turbines and increasing of the main operating showings.Methods of investigation - methods of mathematical and physical modelling of operative processes in wet-steam turbine stages that may cause erosive wear of movable blades.Theoretical and practical results - a universal mathematical model of drop-impact erosion of blade materials has been created, thin chrome vacuum layer that provides increasing of erosive resistance of the last-stage movable blades of the CLP power turbines 5.5 times more in comparison with the traditional means of their passive protection from erosion has been offered; a possibility of increasing of power, economy and erosive resistance of the last-stage power steam turbines when passing on to the new method of their active protection from erosion – with the help of SHF EMF has been grounded. Novelty - an essential scientific and applied problem of information support of the effective complex protection of last stages of power turbines from erosive wear and correspondingly increasing of their power and economy has been solved. Extent of application - the elaborated mathematical models, methods and programmes are being used in investigation and operating practice . Area of application - power turbine building.