(19)
(11)EP 3 757 352 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
13.01.2021 Bulletin 2021/02

(43)Date of publication A2:
30.12.2020 Bulletin 2020/53

(21)Application number: 20182444.8

(22)Date of filing:  26.06.2020
(51)International Patent Classification (IPC): 
F01D 5/20(2006.01)
B22C 9/10(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 26.06.2019 US 201916453101
04.10.2019 US 201916593076

(71)Applicant: Raytheon Technologies Corporation
Farmington, CT 06032 (US)

(72)Inventors:
  • PLACE, Emma J.
    New Hartford, CT Connecticut 06057 (US)
  • FREDETTE, Jeremy B.
    West Hartford, CT Connecticut 06107 (US)
  • JENNINGS, Timothy J.
    New Britain, CT Connecticut 06051 (US)

(74)Representative: Dehns 
St. Bride's House 10 Salisbury Square
London EC4Y 8JD
London EC4Y 8JD (GB)

  


(54)AIRFOIL AND CORE ASSEMBLY FOR GAS TURBINE ENGINE AND METHOD OF MANUFACTURE


(57) A method for forming an airfoil, a core for forming an airfoil, and an airfoil for a gas turbine engine are described. The method includes forming an airfoil body (302; 502; 992) about a core assembly (450), the core assembly comprising at least one core structure (452, 454, 456, 458; 781; 990) having a radially extending purge slot protrusion (462; 782; 994) extending from a portion of the at least one core structure, removing the core assembly from the airfoil body to form one or more internal cavities 530, 532, 534, 536; 632, 634; 783), wherein at least one internal cavity has a cavity extension (642; 784) defined by the purge slot protrusion (462; 782; 994), and forming a squealer pocket (320; 620; 786) in a tip of the formed airfoil body, wherein a cavity purge slot (326; 526; 628; 790) is formed at the cavity extension to fluidly connect the respective internal cavity with the squealer pocket. The radially extending protrusion has a radial height that is equal to or less than five times a width thereof.













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