| 摘要 |
PURPOSE:To well attach a corrosion preventing piece while prevent excessive stress from acting on the corrosion preventing piece, by dividing the corrosion preventing piece to be attached to a blade element main unit along its longitudinal direction while forming a male and a female part fitting to each other in a butt end part of each corrosion preventing piece. CONSTITUTION:A blade element main unit 1, if it reaches a part of predetermined height from the root, applies a twist so as to rapidly contract the sectional shape. Here a corrosion preventing piece, provided in a leading edge part of the blade element main unit 1, is divided into an upper and a bottom part 7, 8 in the part of said predeter mined height. And the upper part corrosion preventing piece 7, integrally providing in its one side a fitting male part 9 further forming a protrusive small piece 11 in the fitting male part 9, is attached in a condition being left as it is to the leading edge part of the blade element main unit 1 through a connection part 3. While the bottom part corrosion preventing piece 8 provides in its one side a fitting female part 10 further forms a cavity groove 12, fitting the protrusive small piece 11, in the fitting female part 10. In this way, a turbine blade can both well attach the corro sion preventing piece to the blade element and prevent excessive stress from acting on the corrosion preventing piece. |
