REDUCTION METHOD OF DYNAMIC STRESSES IN ROTATING BLADES OF TURBINE LAST STAGE

摘要

FIELD: machine building.SUBSTANCE: reduction method of dynamic stresses in rotating blades of the power turbine last stage consists in the fact that aperture angle of the turbine flow part in meridional section is chosen in the range of 13?23°, and the ratio of mean diameter of the impeller of the power turbine last stage to height of the rotating blade at the turbine outlet is 3.5 to 4.0. Minimum thickness of the disc bed of the turbine last stage is chosen so that it equals to or is larger than width of the rotating blade body of the power turbine last stage in a root section.EFFECT: invention allows increasing the turbine efficiency at sufficient dynamic strength of rotating blades of the power turbine last stage.1 dwg