| 摘要 |
PROBLEM TO BE SOLVED: To provide a turbine moving blade provided with a root blade shape capable of keeping centrifugal stress acting on a blade part and a blade implant part below limit value of material and securing steam channel even if length of the blade is increased for increasing annular belt area. SOLUTION: The turbine moving blade of a steam turbine low pressure final stage has annular belt area exceeding 9.6 m<SP>2</SP>(13.8 m<SP>2</SP>) in steam turbine final stage blades of rated rotation speed 3600 rpm (3000 rpm), is formed out of martensite steel, and comprises three regions of an inlet side curved region 12 and an outlet side curved region 13 having curvatures on a back side surface 7 and face side surface 8 of the blade at a root of the turbine moving blade respectively and a region formed roughly linearly between the two curved regions. Also, a blade shape at the turbine moving blade root is formed to satisfy a relation of blade pitch t and turbine axial width of BW/t≥5. COPYRIGHT: (C)2008,JPO&INPIT |
