Patent ID: 7114916
Filing Date: 2006-10-03
Classification: F01D,F05D

Abstract:
1. A turbine engine component comprising: an airfoil portion having a span; at least one cooling passageway in said airfoil portion extending from a root portion of said airfoil portion to a tip portion of said airfoil portion; and a plurality of turbulation promotion devices in said at least one cooling passageway, said turbulation promotion devices comprising a plurality of spaced apart pairs of arcuately shaped trip strips, said turbulation promotion devices having a P/e which varies along the span of said airfoil portion, where P is the pitch between adjacent ones of said turbulation promotion devices and e is the height of each said turbulation promotion device, wherein the P/e ratio of said turbulation promotion devices is lower in a midspan region of said at least one cooling passageway than in an end region of said at least one cooling passageway and wherein said P/e ratio is in the range of from 5 to 30 in said midspan region.