초록 ▼

A blade outer air seal (BOAS) has a body having an inner (ID) face and an outer (OD) face, first and second circumferential ends, and fore and aft longitudinal ends. The BOAS has one or more mounting hooks extending from the body. The OD face comprises a plurality of transversely elongate protuberan

A blade outer air seal (BOAS) has a body having an inner (ID) face and an outer (OD) face, first and second circumferential ends, and fore and aft longitudinal ends. The BOAS has one or more mounting hooks extending from the body. The OD face comprises a plurality of transversely elongate protuberances. The protuberances include rearwardly divergent first protuberances and forwardly divergent second protuberances.

대표청구항 ▼

What is claimed is: 1. A blade outer air seal comprising: a body having an inner diameter (ID) face and an outer diameter (OD) face, first and second circumferential ends, fore and aft longitudinal ends and a plurality of cooling passageways; and one or more mounting hooks, wherein: the OD face co

What is claimed is: 1. A blade outer air seal comprising: a body having an inner diameter (ID) face and an outer diameter (OD) face, first and second circumferential ends, fore and aft longitudinal ends and a plurality of cooling passageways; and one or more mounting hooks, wherein: the OD face comprises a plurality of transversely elongate protuberances including, rearwardly divergent first protuberances and forwardly divergent second protuberances. 2. The seal of claim 1 wherein: the protuberances have heights of 0.03+/-0.002 inch. 3. The seal of claim 1 wherein the cooling passageways include: a leading plurality having inlets along a leading wall surface portion forward of the protuberances; a trailing plurality having inlets along a trailing wall surface portion aft of the protuberances; and first and second lateral pluralities having inlets among the protuberances. 4. The seal of claim 1 wherein: the protuberances are positioned in right arrays; and inlets of at least some the cooling passageways along the OD face are positioned among the protuberances. 5. The seal of claim 1 wherein: the seal is formed of a nickel-based superalloy. 6. The seal of claim 5 wherein: the seal has a coating. 7. The seal of claim 5 wherein: the first protuberances have rearwardly divergent fore and aft faces; and the second protuberances have forwardly divergent fore and aft faces. 8. The seal of claim 1 wherein: the first protuberances have rearwardly divergent fore and aft faces; and the second protuberances have forwardly divergent fore and aft faces. 9. The seal of claim 1 wherein: the body has a perimeter wall and the protuberances are along a base of a compartment laterally surrounded by the perimeter wall. 10. The seal of claim 9 wherein: the protuberances are positioned in four discrete right arrays. 11. The seal of claim 1 wherein: the protuberances are positioned in four discrete right arrays. 12. A combination comprising: a circumferential array of seals of claim 1; and blade stage with blade tips in facing proximity to the seal ID faces. 13. The combination of claim 12 wherein: seal mounting hooks engage mating features of a support structure. 14. A blade outer air seal comprising: a body having an inner diameter (ID) face and an outer diameter (OD) face, first and second circumferential ends, and fore and aft ends; and a pair of mounting hooks, wherein: the OD face comprises a plurality of chevron or apex-less chevron planform protuberances; and the protuberances include a fore group of forwardly divergent protuberances and an aft group of rearwardly divergent protuberances. 15. The seal of claim 14 wherein: a longitudinal dividing wall separates the protuberances into first and second circumferential groups. 16. The seal of claim 15 further comprising: outlet passageways extending from inlets among the protuberances to outlets along the first and second circumferential ends. 17. A combination comprising: seal of claim 16; an impingement plate having an array of apertures; and an airflow through the apertures and then through the outlet passageways. 18. The combination of claim 17 wherein: the airflow forms a forwardly-directed portion flowing over the fore group of protuberances and a rearwardly-directed portion flowing over the aft group of protuberances. 19. The combination of claim 17 wherein: a ratio of height of the protuberances to a distance between an underside of the plate and a floor of the OD face is between 0.05 and 0.10, inclusive. 20. The seal of claim 14 further comprising: outlet passageways extending from inlets among the protuberances to outlets along the first and second circumferential ends; and an impingement plate mounted to the body and having an array of apertures, the apertures positioned to allow an airflow through the apertures and then through the outlet passageways.