METHOD FOR GENERATING AN AIRFOIL INCLUDING AN AERODYNAMICALLY-SHAPED FILLET AND AIRFOILS INCLUDING THE AERODYNAMICALLY-SHAPED FILLET

摘要

Methods are provided for generating an airfoil including an aerodynamically-shaped fillet. 2D fillet curve offset values are defined by obtaining a 2D airfoil image having airfoil surface line and transition region interconnecting airfoil surface line to flowpath surface line with 2D fillet curve. Flowpath offset lines are generated on image at predetermined flowpath offset values and, in the transition region, graphically represent a flowpath offset surface. Intersection point between 2D fillet curve and each flowpath offset line is determined Distance between airfoil surface line and each intersection point generates airfoil offset values. Airfoil and flowpath offset surfaces according to airfoil offset values and flowpath offset values respectively and 3D fillet streamline curves are generated on computer model to define the aerodynamically-shaped fillet. Each 3D fillet streamline curve is an intersection between the airfoil and flowpath offset surfaces.

主权项

1. A method for generating an airfoil including an aerodynamically-shaped fillet, the method comprising:
defining a plurality of two-dimensional (2D) fillet curve offset values by:
obtaining a 2D image of an airfoil having an airfoil surface line and including a transition region interconnecting the airfoil surface line to a flowpath surface line with a 2D fillet curve;generating a plurality of flowpath offset lines on the 2D image at pre-determined flowpath offset values, each flowpath offset line of the plurality of flowpath offset lines in the transition region graphically representing a flowpath offset surface of a plurality of flowpath offset surfaces;determining an intersection point between the 2D fillet curve and each flowpath offset line;computing a distance between the airfoil surface line and each intersection point to generate a plurality of airfoil offset values; generating a plurality of airfoil offset surfaces according to each airfoil offset value of the plurality of airfoil offset values on a computer model of the airfoil configured to include the aerodynamically-shaped fillet; generating the plurality of flowpath offset surfaces according to each flowpath offset value on the computer model; and generating a plurality of 3D fillet streamline curves on the computer model to define the aerodynamically-shaped fillet of the airfoil, each 3D fillet streamline curve comprising an intersection between an airfoil offset surface of the plurality of airfoil offset surfaces and a flowpath offset surface of the plurality of flowpath offset surfaces. generating a computer model of the airfoil including the aerodynamically-shaped fillet.