An Improvement of Performance in Steam Turbine by Developing Three-Dimensionally Designed Blades

概要

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From the viewpoint of reducing power generation costs and saving energy resources, improved efficiency of thermal power plants is a critical issue. Steam turbines, which are the main plant equipment, have been developed which provide a high level in blade performance. Further enhancement of blade performance, however, requires refinement of the blade shape and the control flow pattern in the radial direction. Recently, development of three-dimensionally designed blades has been active, with goals of raising the internal efficiency and being able to the control flow pattern in the radial direction not only for stationary blades, but also for moving blades^<(1)-(3)>. In order to improve the flow pattern through the blade rows, the authors have proposed three-dimensionally designed stationary blades^<(4)-(7)>, which can be used in low pressure(LP) and high and intermediate pressure(HIP)turbines. This paper describes the development of three-dimensionally designed blades, in which performance of turbine stages including moving blades has been improved. The new blades reduce the end-wall losses in the HIP stages where there is a serious problem with secondary flow.
一般社団法人日本機械学会の論文
1998-11-15