公开(公告)号：DE69523026D1

公开(公告)日：2001-11-08

申请号：DE69523026

申请日：1995-12-21

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KOFF STEVEN G ,  KOFF BERNARD L ,  LYON BRUCE V ,  DUER MARK G

IPC: F01D5/06 ,  F01D5/14 ,  F01D11/00 ,  F01D11/02 ,  F01D11/08 ,  F01D11/10 ,  F02C3/06 ,  F02C7/18 ,  F04D27/02 ,  F04D29/54 ,  F01D5/30

Abstract: Cantilevered stator vanes (46) of the compressor section of a gas turbine engine are treated by providing a rotary hub (48) with a bypass passage (56) for removing the low momentum fluid from the main air stream adjacent to the tips of the stator vanes in the compressor and returning it back into the main air stream after having treated the air while avoiding penalties and excessive heating. A plurality of vanes (66) are circumferentially spaced in the bypass passage (56) to remove vortices and streamlining the flow before injecting the air back into the airstream. The hub is fabricated in a single cast piece in one embodiment, in a three ring configuration in another embodiment and in a segmented ring configuration in still another embodiment.

公开(公告)号：DE69204861D1

公开(公告)日：1995-10-26

申请号：DE69204861

申请日：1992-01-29

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KOFF STEVEN G ,  NIKKANEN JOHN P ,  MAZZAWY ROBERT S

IPC: F02C3/06 ,  F01D11/08 ,  F02C7/00 ,  F02C7/28 ,  F02K3/06 ,  F04D29/54 ,  F04D29/68

Abstract: To enhance stall margin without degrading engine performance the case (14) of the fan (10) of a fan-jet engine is treated by incorporating a passageway to remove flow from the main flow stream (A). The location and amount of the low momentum flow relative to the rotor being removed is critical. The flow is removed at a judicious location downstream of the leading edge (32) of the rotor blade (18) and returned at a judicious location upstream of the point of removal. The amount of removed flow must be no greater than 8% of the total flow in the fan rotor. Anti-swirl vanes (38) in the passageway and discreetly sized inlet and outlet passages (34,36) of the passageway return the flow to the main stream at an increased velocity. The intake is so designed that it selectively removes only the weak low momentum flow relative to the rotor and encourages the strong mainstream flow to remain in the main gas stream.

公开(公告)号：DE69523026T2

公开(公告)日：2002-05-29

申请号：DE69523026

申请日：1995-12-21

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KOFF STEVEN G ,  KOFF BERNARD L ,  LYON BRUCE V ,  DUER MARK G

IPC: F01D5/06 ,  F01D5/14 ,  F01D11/00 ,  F01D11/02 ,  F01D11/08 ,  F01D11/10 ,  F02C3/06 ,  F02C7/18 ,  F04D27/02 ,  F04D29/54 ,  F01D5/30

Abstract: Cantilevered stator vanes (46) of the compressor section of a gas turbine engine are treated by providing a rotary hub (48) with a bypass passage (56) for removing the low momentum fluid from the main air stream adjacent to the tips of the stator vanes in the compressor and returning it back into the main air stream after having treated the air while avoiding penalties and excessive heating. A plurality of vanes (66) are circumferentially spaced in the bypass passage (56) to remove vortices and streamlining the flow before injecting the air back into the airstream. The hub is fabricated in a single cast piece in one embodiment, in a three ring configuration in another embodiment and in a segmented ring configuration in still another embodiment.

公开(公告)号：DE69204861T2

公开(公告)日：1996-05-23

申请号：DE69204861

申请日：1992-01-29

Applicant: UNITED TECHNOLOGIES CORP

Inventor： KOFF STEVEN G ,  NIKKANEN JOHN P ,  MAZZAWY ROBERT S

IPC: F02C3/06 ,  F01D11/08 ,  F02C7/00 ,  F02C7/28 ,  F02K3/06 ,  F04D29/54 ,  F04D29/68

Abstract: To enhance stall margin without degrading engine performance the case (14) of the fan (10) of a fan-jet engine is treated by incorporating a passageway to remove flow from the main flow stream (A). The location and amount of the low momentum flow relative to the rotor being removed is critical. The flow is removed at a judicious location downstream of the leading edge (32) of the rotor blade (18) and returned at a judicious location upstream of the point of removal. The amount of removed flow must be no greater than 8% of the total flow in the fan rotor. Anti-swirl vanes (38) in the passageway and discreetly sized inlet and outlet passages (34,36) of the passageway return the flow to the main stream at an increased velocity. The intake is so designed that it selectively removes only the weak low momentum flow relative to the rotor and encourages the strong mainstream flow to remain in the main gas stream.