Development of last-stage long blades for steam turbines

T. Tanuma,    Teikyo University, Tokyo, Japan


The aim of this chapter is to present development and design technologies and methodologies of last-stage long blades for large-scale steam turbines for modern power plants. Technical features of last-stage long blades are high centrifugal force, high blade speed, three-dimensional flow, wet steam flow, and relatively large unsteady flow forces during low-load operations. These features are the result of the required large annulus areas that are required, which make last-stage long blade developments difficult. Furthermore, as the name suggests, last stages with exhaust diffusers need to be designed carefully to minimize the leaving ...

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