Operational features of root joints with shoulders
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The use of shoulders in root joints of steam turbine blades hinders the lateral opening of the disk flanges, and in addition it relieves the blade root of dynamic bending forces.
The effect of the operation of the shoulders, connected with the root being relieved of the bending moment, depends on the static tensile load, the rigidity of the flanges of the disk rim, and on the dynamic bending load imposed on the blade.
When the blade vibrates, wear may occur, as a result of which contact along the shoulders is impaired, and this is accompanied by a rapid increase of the dynamic loads on the root.
KeywordsSteam Operational Feature Flange Dynamic Load Turbine Blade
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- 1.Ch. G. Mustafin and V. V. Nekrasov, “Improvements of the profiles of root joints with shoulders of turbine blades,” Probl. Prochn., No. 8, 81–84 (1973).Google Scholar
- 2.“Investigation, of the strength of materials of turbine blades,” in: Collection of the Central Research Institute of Engineering Technology, Book 103, Mashgiz, Moscow (1961), pp. 42–45.Google Scholar