Aeromechanical characterization strategy for high pressure steam turbines

The thesis deals with a viable strategy of aeromechanical characterization of steam turbine blades for high pressure stages for industrial application In the first part of the work, the effects related to the fludo-structure interaction for the evaluation of aerodynamic damping are taken into consideration. In the second part the effects of the multi-row environment for the evaluation of the forcing effect of the adjacent stators on the rotor blade are studied. In confirmation of the strategy developed in the first part of the thesis, the work ends with the evaluation of aerodynamic damping in multi-rows environment, taking into consideration not only the unsteadiness related to the blade modeshape, but also those due to the interaction of wakes and potential fields of the stators adjacent to the rotor blade under examination.