Reducing the mass of the gas turbine first stage blade by changing its cooling scheme

Abstract

In order to modernize the gas turbine unit (GTU), which is currently in operation, a convective film cooling scheme for the gas turbine first stage blade was applied. The modeling the working process in the turbine stage is considered. At the nominal operating mode of the GTU, the thermal and stress-strain state of the blade with the modified cooling scheme is estimated. According to the criterion of the long-term strength safety margin, the service life of the blade at the nominal mode is estimated. The modified scheme allows to reduce the mass of the blade, reduce the average level of stress in the root section of the blade.