Arrangement for controlling fluid jets injected into a fluid stream of a bleed air discharge nozzle

• US 8,683,812 B2
• Filed: 04/27/2011
• Issued: 04/01/2014
• Est. Priority Date: 05/18/2005
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Bertolotti, Fabio R., Liscinsky, David S., Nardone, Vincent C., Sahm, Michael K., Noack, Bernd R., Sabatino, Daniel R.
• Primary Examiner(s): Gartenberg, Ehud
• Assistant Examiner(s): MEADE, LORNE EDWARD
• Application Number:
  US13/094,881
• Publication Number:
  US 20110204162A1
• Time in Patent Office: 1,070 Days
• Field of Search: 602/261, 602/62, 607/82, 607/85, 415/144, 415/145, 415/914
• US Class Current: 60/785
• CPC Class Codes: F01D 5/145 Means for influencing boundary layers or secondary circulations for compressors F04D29/68
• CPC Class Codes: F02C 6/08 the gas being bled from the gas-turbine compressor
• CPC Class Codes: F02K 1/28 using fluid jets to influence the jet flow
• CPC Class Codes: F02K 1/38 Introducing air inside the jet F02K1/28 takes precedence
• CPC Class Codes: F02K 1/46 Nozzles having means for adding air to the jet or for augmenting the mixing region between the jet and the ambient air, e.g. for silencing F02K1/28, F02K1/36, F02K1/38 take precedence
• CPC Class Codes: F23D 14/583 of elongated shape, e.g. slits
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft
• CPC Class Codes: Y10T 137/0329 Mixing of plural fluids of diverse characteristics or conditions

Abstract

In an air mixing arrangement wherein a primary fluid is introduced through an opening in a wall to be mixed with a secondary fluid flowing along the wall surface, the opening is airfoil shaped with its leading edge being orientated at an attack angle with respect to the secondary fluid flow stream so as to thereby enhance the penetration and dispersion of the primary fluid stream into the secondary fluid stream. The airfoil shaped opening is selectively positioned such that its angle of attack provides the desired lift to optimize the mixing of the two streams for the particular application. In one embodiment, a collar is provided around the opening to prevent the secondary fluid from contacting the surface of the wall during certain conditions of operation. Multiple openings maybe used such as the combination of a larger airfoil shaped opening with a smaller airfoil shaped opened positioned downstream thereof, or a round shaped opening placed upstream of an airfoil shaped opening. Pairs of openings and associated collars maybe placed in symmetric relationship so as to promote mixing in particular applications, and nozzles maybe placed on the inner side of wall to enhance the flow characteristics of the primary fluid.

Claims

1. An apparatus for injecting a primary fluid flow stream into the flow stream of a secondary fluid, said apparatus comprising:

a wall member defining a boundary for the flow of the secondary fluid in a first direction over its one surface, said wall member having a plurality of airfoil shaped openings formed therein for the flow of the primary fluid therethrough in a second direction so as to be mixed with the secondary fluid,

wherein said plurality of openings are orientated at an angle of attack, α

, with respect to said first direction,

wherein said airfoil shaped openings have at least one pair disposed about said first direction,

wherein at least two airfoil shaped openings include collars positioned with opposite directed lift directions,

wherein said apparatus comprises a jet engine bleed air discharge nozzle, and

wherein said primary fluid is compressor bleed air and said secondary fluid is air external to the compressor.

2. An apparatus according to claim 1, wherein said pair is symmetrically disposed about said first direction.

3. An apparatus according to claim 2, wherein said angle of attack for said pair is on opposite sides of said first direction.

4. An apparatus as according to claim 1, wherein each of said airfoil shaped openings includes a collar surrounding said opening and extends outwardly from one surface of said wall member.

5. An apparatus as according to claim 1, wherein each of said plurality of airfoil shaped openings includes a guide vane attached to an extending outwardly from another surface of said wall member.

6. An apparatus according to claim 1, wherein at least four airfoil shaped openings include collars.

7. An apparatus according to claim 6, wherein the four airfoil shaped openings with collars include two outer collars and two inner collars.

8. An apparatus according to claim 7, wherein each of the two outer collars is oriented to give a lift directed in a same direction as that of the neighboring inner collar.

9. An apparatus according to claim 8, wherein the two outer collars are tilted away from the two inner collars.

10. An apparatus according to claim 9, wherein the two inner collars are lower in height than a height of the two outer collars.

11. An apparatus for mixing a primary fluid stream with a secondary fluid stream flowing in a first direction comprising:

a wall defining a boundary for said secondary fluid stream, said wall having a plurality of airfoil shaped openings; and

means for providing a flow of said primary fluid in a second direction through said airfoil shaped opening for mixing with said secondary fluid stream,

wherein said airfoil shaped openings have at least one pair disposed about said first direction,

wherein at least two airfoil shaped openings include collars positioned with opposite directed lift directions,

wherein said apparatus comprises a jet engine bleed air discharge nozzle, and

wherein said primary fluid is compressor bleed air and said secondary fluid is air external to the compressor.

12. An apparatus according to claim 11, wherein said second direction is substantially normal to said first direction.

13. An apparatus according to claim 11, wherein said airfoil shaped openings have a leading edge and trailing edge, and wherein said airfoil shaped openings are orientated at an angle of attack, α

, with respect to said first direction.

14. An apparatus according to claim 12, wherein said pair is symmetrically disposed with respect to said first direction.

15. An apparatus according to claim 14, wherein an angle of attack for each of said pair is on opposite sides of said first direction.

16. An apparatus according to claim 11, wherein at least four airfoil shaped openings include collars.

17. An apparatus according to claim 16, wherein the four airfoil shaped openings with collars include two outer collars and two inner collars.

18. An apparatus according to claim 17, wherein each of the two outer collars is oriented to give a lift directed in a same direction as that of the neighboring inner collar.

19. An apparatus according to claim 18, wherein the two outer collars are tilted away from the two inner collars.

20. An apparatus according to claim 19, wherein the two inner collars are lower in height than a height of the two outer collars.