公开(公告)号：DE4436186C2

公开(公告)日：2001-10-25

申请号：DE4436186

申请日：1994-10-10

Applicant: UNITED TECHNOLOGIES CORP PRATT

Inventor： FRELING MELVIN ,  GRUVER GARY A ,  PARKOS JUN JOSEPH J ,  WELCH DOUGLAS A

IPC: F01D5/14 ,  F01D5/20 ,  F01D5/28 ,  F04D29/02 ,  F04D29/08 ,  F04D29/32 ,  F04D29/38

Abstract: A method and apparatus for increasing blade fatigue strength in a turbine engine. The blades in the turbine engine are configured so as to reduce stress at the tip of the blades during operation of the turbine engine, thus increasing blade fatigue strength. This stress reduction helps to counteract the detrimental effect of abrasive tip coatings on blade fatigue strength. In one embodiment, the tip of the blade is chamfered in order to reduce the stress on the tip of the blade. An abrasive coating is then applied to the tip of the blade to assist the blade in seating into an abradable outer air seal. In another embodiment, an abrasive coating is applied to a center portion of the tip of the blade, with the periphery of the abrasive coating being set back from the opposing surfaces of the blade.

公开(公告)号：DE4436186A1

公开(公告)日：1995-05-04

申请号：DE4436186

申请日：1994-10-10

Applicant: UNITED TECHNOLOGIES CORP PRATT

Inventor： FRELING MELVIN ,  GRUVER GARY A ,  PARKOS JUN JOSEPH J ,  WELCH DOUGLAS A

IPC: F01D5/14 ,  F01D5/20 ,  F01D5/28 ,  F04D29/02 ,  F04D29/08 ,  F04D29/32 ,  F04D29/38 ,  F01D5/12 ,  C23C4/10 ,  B23P15/02 ,  B23P9/04 ,  B23P9/02

Abstract: A method and apparatus for increasing blade fatigue strength in a turbine engine. The blades in the turbine engine are configured so as to reduce stress at the tip of the blades during operation of the turbine engine, thus increasing blade fatigue strength. This stress reduction helps to counteract the detrimental effect of abrasive tip coatings on blade fatigue strength. In one embodiment, the tip of the blade is chamfered in order to reduce the stress on the tip of the blade. An abrasive coating is then applied to the tip of the blade to assist the blade in seating into an abradable outer air seal. In another embodiment, an abrasive coating is applied to a center portion of the tip of the blade, with the periphery of the abrasive coating being set back from the opposing surfaces of the blade.