| 摘要 |
A turbine bucket (64) includes a radially inner mounting portion; a shank (82) radially outward of the mounting portion; at least one radially outer airfoil (68) having a leading edge (72) and a trailing edge (74); a substantially planar platform (80) radially between the shank (82) and the at least one radially outer airfoil (68); at least one axially-extending angel wing seal flange (84) on a leading end of the shank (80) thus forming a circumferentially extending trench cavity (106) along the leading end of the shank (82), radially between an underside of the platform leading edge (100) and a radially outer side of the angel wing seal flange (84); and slash faces (108,110) along opposite, circumferentially-spaced side edges of the platform (80). At least one of the slash faces (108,110) is formed with a dog-leg shape, a leading end of the at least one of slash face (108,110) terminating at a location circumferentially offset from the leading edge (72) of the at least one radially outer airfoil (68). A corresponding method of controlling purge air flow is also provided. |
