TURBINE SECTION HAVING NON-AXISYMMETRIC ENDWALL CONTOURING WITH FORWARD MID-PASSAGE PEAK

摘要

A turbine section (28, 34) includes a pair of adjacent turbine airfoils (59A, 59B) and an endwall (64A, 64B) extending between the airfoils (59A, 59B). The endwall (64A, 64B) includes a first feature (80) spanning approximately twenty percent pitch (P) and having a first depression (82) with a first maximum depression (84) located between twenty percent and sixty percent of an axial chord length (76) of the first airfoil (59A), a second feature (86) adjacent the first feature (80) with the second feature (86) spanning approximately forty percent pitch (P) and having a first peak (88) with a maximum height (90) located between twenty percent and sixty percent of the axial chord length (76) of the first airfoil (59A), and a third feature (92) adjacent the second feature (86) and first side (68) of the second airfoil (59B) with the third feature (92) spanning approximately forty percent pitch (P) and having a second depression (94) with a second maximum depression (96) located between thirty percent and sixty percent of an axial chord length (76) of the second airfoil (59B).