Turbine blades, methods of tuning the natural frequencies of turbines and turbine blades

摘要

The turbine blade includes a platform, an airfoil portion having a pressure surface and a negative pressure surface extending between a leading edge and a trailing edge extending in the wing height direction from the platform, and the airfoil portion in the wing height direction with the platform interposed therebetween. It is located on the opposite side, and includes a blade root portion having a bearing surface, and a shank located between the platform and the blade root portion, the shank being orthogonal to the height direction of the blade portion of the airfoil, and the shank on the leading edge side A line segment connecting the central position of the end of the blade in the width direction and the central position of the end of the shank on the trailing edge is the contour of the pressure surface side of the blade root and the contour of the negative pressure surface side of the blade root. It has a cross section that is inclined with respect to the center line.