Fursova T. The improvement of constructions and the reliability augmentation of roots joints of rotor blades of steam-turbines

Object of study - deflected mode of steam turbine rotor blades roots joins. Purpose of study - improvement of design and reliability augmentation of steam turbine rotor blade roots joints on the basis of advanced analysis of their deflected mode features. Methods of study: experimental photoelasticity method, finite element method, calculation methods based on elasticity theory dispositions. Theoretical and practical results: recommendations on compensation of technological gaps in multisupporting root join and suggestions on the decline of nonuniformity of distribution of tensions. Novelty: for the first time voluminous deflected mode of steam turbine rotor blade roots joints was studied by experimental photoelasticity method under various forms of supporting surfaces with process clearances present, thus the distribution of stresses along the thickness of root being found; for the first time the effect of contact surface shapes on the character of their strains was determined and a method proposed for determination of strains in such surfaces; the effect of geometric parameters on irregularity of strain distributions in mushroom rear connection was studied which permitted to develop steps on reduction of strain concentrations: an improved profile was developed for a mushroom multi-support root join with a more even strain distribution. Degree of introduction: the results of thesis are used on Turboatom Public Corporation engineering practice as well as in training process at Thermal Energy and Energy-Saving Department of Ukrainian Engineering Pedagogical Academy. Field of application: Turbines manufacture (power machine industry).