Compressor bleed apparatus for a turbine engine

Patent metadata

Field	Value
Publication number	US-2018355877-A1
Application number	US-201715620904-A
Country	US
Kind code	A1
Filing date	Jun 13, 2017
Priority date	Jun 13, 2017
Publication date	Dec 13, 2018
Grant date	—

Abstract

A compressor bleed apparatus includes: a compressor comprising one or more rotors mounted for rotation about a central axis and enclosed in a compressor casing; a bleed slot passing through the compressor casing; an outer wall defining, in cooperation with the compressor casing, a plenum surrounding the compressor casing; at least one offtake pipe communicating with the plenum; and wherein at least one of the plenum and the bleed slot has a non-axisymmetric structure.

First claim

What is claimed is:

1 . A compressor bleed apparatus, comprising:
a compressor comprising one or more rotors mounted for rotation about a central axis and enclosed in a compressor casing; a bleed slot passing through the compressor casing; an outer wall defining, in cooperation with the compressor casing, a plenum surrounding the compressor casing; at least one offtake pipe communicating with the plenum; and wherein at least one of the plenum and the bleed slot has a non-axisymmetric structure.

2 . The apparatus of claim 1 wherein the non-axisymmetric structure is configured to produce a substantially uniform static pressure distribution within the plenum.

3 . The apparatus of claim 1 wherein:
the bleed slot is configured as a plurality of individual apertures arrayed around the circumference of the compressor casing; and
the individual apertures have different flow areas.

4 . The apparatus of claim 3 wherein:
the individual apertures distant from a circumferential location of the at least one offtake pipe have a first flow area; and
the individual apertures at the circumferential location of the at least one offtake pipe have a second flow area that is smaller than the first flow area.

5 . The apparatus of claim 4 wherein the size of the individual apertures near the circumferential location of the offtake pipe progressively increases from the first flow area to the second flow area.

6 . The apparatus of claim 1 wherein:
the bleed slot is configured as a plurality of individual apertures arrayed around the circumference of the compressor casing; and
at least one of the individual apertures has a flow area which increases or decreases in a direction from an inlet of the individual aperture to an outlet of the individual aperture.

7 . The apparatus of claim 1 wherein:
the plenum at locations distant from the circumferential location of the offtake pipe has a first volume; and
the plenum at locations near the circumferential location of the offtake pipe has a second volume greater than the first volume.

8 . The apparatus of claim 7 wherein the outer wall incorporates an outward bulge near a circumferential location of the offtake pipe.

9 . The apparatus of claim 1 wherein the bleed slot comprises a continuous annular slot.

10 . The apparatus of claim 9 wherein the bleed slot incorporates at least one portion having a flow area which increases or decreases in a direction from an inlet of the bleed slot to an outlet of the bleed slot.

11 . The apparatus of claim 10 wherein:
the bleed slot at locations distant from a circumferential location of the at least one offtake pipe has a first flow area; and
the bleed slot at the circumferential location of the at least one offtake pipe has a second flow area that is smaller than the first flow area.

12 . The apparatus of claim 1 apparatus further comprising:
a combustor downstream of the compressor; and
a turbine downstream of the combustor mechanically coupled in driving relationship with the compressor.

13 . The apparatus of claim 1 wherein the compressor includes:
an upstream portion comprising an axial-flow compressor, and a downstream portion comprising a centrifugal-flow compressor; and
the bleed slot is disposed between the upstream and downstream portions.

14 . The apparatus of claim 1 wherein the downstream portion is surrounded by a casing with a main portion and an outer skirt defining the outer wall.

15 . A method of bleeding air from a compressor comprising one or more rotors mounted for rotation about a central axis and enclosed in a compressor casing, the method comprising: bleeding air from the compressor casing into a plenum surrounding the compressor casing through a bleed slot and subsequently into one or more offtake pipes communicating with the plenum, wherein the air is bled through the slot in a non-axisymmetric flow pattern, so as to produce substantially uniform static pressure around a periphery of the bleed slot.

16 . The method of claim 15 wherein:
the bleed slot is configured as a plurality of individual apertures arrayed around the circumference of the compressor casing; and
the individual apertures have different flow areas.

17 . The method of claim 16 wherein:
the individual apertures different from a circumferential location of the at least one offtake pipe have a first flow area; and
the individual apertures at the circumferential location of the at least one offtake pipe have a second flow area that is smaller than the first flow area.

18 . The method of claim 15 wherein the bleed slot comprises a continuous annular slot.

19 . The method of claim 18 wherein the bleed slot incorporates at least one portion having a flow area which increases or decreases in a direction from an inlet of the bleed slot to an outlet of the bleed slot.

20 . The method of claim 15 wherein:
the plenum at locations distant from the circumferential location of the offtake pipe has a first volume; and
the plenum at locations near the circumferential location of the offtake pipe has a second volume greater than the first volume.

Assignees

• Gen Electric

Inventors

• Donnelly Stephen Raymond
• Nakanishi Masato
• Capozzi Joseph

Classifications

• F05D2240/35

  Combustors or associated equipment · CPC title

• F02C9/18 Primary

  by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} · CPC title

• F04D27/009 Primary

  by bleeding, by passing or recycling fluid · CPC title

• F02C3/04

  having a turbine driving a compressor (power transmission arrangements F02C7/36; control of working fluid flow F02C9/16) · CPC title

• F04D29/403

  especially adapted for elastic fluid pumps · CPC title