TURBINE BUCKET INCLUDING BUCKET AIRFOIL HAVING AIRFOIL SHAPE AND TURBINE INCLUDING TURBINE WHEEL HAVING PLURAL BUCKETS

摘要

PURPOSE: A turbine bucket including a bucket airfoil and a turbine including a turbine wheel are provided to improve aerodynamic efficiency and aerodynamic and mechanical loading of a 4-stage airfoil. CONSTITUTION: In a turbine bucket(28) including a bucket airfoil having an airfoil shape, the airfoil has a nominal profile by Cartesian coordinates of X, Y, and Z. A Z value is a nondimensional value from zero to 1 conversional into Z distance of inches by multiplying the Z value by the height of the airfoil of inches. X and Y are distance of inches and the distance defines airfoil profile sections in each Z distance when the distance is connected in a smooth continuous arc. The profile sections in the Z distance are smoothly connected and a complete airfoil section is formed.