Gas turbine with optimized airfoil element angles

摘要

A turbine airfoil assembly for installation in a gas turbine engine. The airfoil assembly includes an endwall and an airfoil extending radially outwardly from the endwall. The airfoil includes pressure and suction sidewalls defining chordally spaced apart leading and trailing edges of the airfoil. An airfoil mean line is defined located centrally between the pressure and suction sidewalls. An angle between the mean line and a line parallel to the engine axis at the leading and trailing edges defines gas flow entry angles, α, and exit angles, β. Airfoil inlet and exit angles are substantially in accordance with pairs of inlet angle values, α, and exit angle values, β, set forth in one of Tables 1, 3, 5 and 7.

主权项

1. A turbine airfoil assembly for installation in a gas turbine engine having a longitudinal axis, the turbine airfoil assembly including an endwall for defining an inner boundary for an axially extending hot working gas path, and an airfoil extending radially outwardly from the endwall, said airfoil having an outer wall comprising a pressure sidewall and a suction sidewall joined together at chordally spaced apart leading and trailing edges of said airfoil, an airfoil mean line is defined extending chordally and located centrally between said pressure and suction sidewalls, airfoil inlet and exit angles are defined at said airfoil leading and trailing edges that are in accordance with pairs of inlet angle values, α, and exit angle values, β, set forth in one of Tables 1, 3, 5 and 7, where said inlet and exit angle values are defined as angles between a line parallel to the longitudinal axis and the airfoil mean line lying in an X-Y plane of an X, Y, Z Cartesian coordinate system in which Z is a dimension perpendicular to the X-Y plane and extends radially relative to the longitudinal axis, and wherein each pair of inlet and exit angle values is defined with respect to a distance from said endwall corresponding to a Z value that is a percentage of a total span of said airfoil from said endwall, and wherein a predetermined difference between each pair of said airfoil inlet and exit angles is defined by a delta value, Δ, in said one of Tables 1, 3, 5 and 7, and a measured difference between any pair of said airfoil inlet and exit angles varies from the corresponding delta values, Δ, in said one of Tables 1, 3, 5 and 7 by at most 5%.