| 摘要 |
A coolable borescope boss (128) includes cooling passages (250) extending through the boss (128) and oriented for spraying cooling air (140) into a hole (180) extending through the boss (128). Centerlines (260) of the cooling passages (250) may intersect the a hole axis (220) of the hole. The cooling passages (250) may be cylindrical or open slots (276) disposed through the boss (128). The boss may be on an arcuate gas turbine engine shroud segment (134) circumscribed about an axial centerline axis (12). The segment may be part of an annular segmented turbine shroud (122) having cylindrical shroud first and second sections (224, 226) and a conical shroud midsection (228) therebetween and the segment (134) having cylindrical segment first and second sections (234, 236) and a conical segment midsection (238) therebetween. A hole exit (222) of the hole (180) being flush with the conical segment midsection (238). A borescope plug (40) tip (58) having a spherical tip chamfer (92) may be used to seal against a conical boss chamfer (94) of the boss. |
