OVERLAPPING HERRINGBONE FILMHOLE PATTERNED AIRFOIL

摘要

An airfoil having an overlapping herringbone filmhole pattern is disclosed. For instance, the airfoil may have filmholes arranged in filmrows, each filmrow divided into groups of filmholes. A first group may be oriented to direct cooling air generally radially outward over a surface of the airfoil and a second group may be oriented to direct cooling air generally radially inward over a surface of the airfoil. Between the first group and the second group of filmholes in each filmrow, a transition region exists. A transition region filmrow group may be disposed within the transition region and may be co-linear with or staggered relative to the first group and/or the second group. In this manner, the transition region filmrow group enhances the effectiveness of the cooling proximate to the transition region.

主权项

1. An airfoil comprising an overlapping herringbone filmhole pattern, wherein the overlapping herringbone filmhole pattern comprises a first filmrow comprising:
a first radially outward facing portion comprising filmholes oriented to direct cooling air leaving the filmholes radially outward of an engine central longitudinal axis and over a surface of the airfoil; a first radially inward facing portion comprising filmholes oriented to direct cooling air leaving the filmholes radially inward toward the engine central longitudinal axis and over the surface of the airfoil; a first transition region comprising a first region at least one of equidistant from distal ends, centered relative to mesial ends, or radially overlapping the mesial ends of the first radially outward facing portion and the first radially inward facing portion; and a first transition region filmhole group located in the first transition region, wherein the first transition region filmhole group comprises filmholes oriented to direct cooling air leaving the filmholes at least one of radially outward or radially inward relative to the engine central longitudinal axis and over the surface of the airfoil.