Heat transfer augmented fluid flow surfaces

Patent metadata

Field	Value
Publication number	US-9376960-B2
Application number	US-201113189221-A
Country	US
Kind code	B2
Filing date	Jul 22, 2011
Priority date	Jul 23, 2010
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A heat transfer augmented channel wall includes a bulk portion, a wall surface and a plurality of multi-portion indented features extending from the wall surface into the bulk portion. The multi-portion indented features include a first indented portion and a second indented portion that are divided by a ridge which disrupts fluid flow between first and second indented portions. The ridge has a height that is less than a maximum depth of the multi-portion indented features.

First claim

We claim:

1. A turbine engine, comprising:
a compressor for pressurizing air to generate compressed air;
a combustion chamber for mixing said compressed air with fuel and combusting for generating a stream of hot combustion gases;
a turbine section for extracting energy from said stream of hot combustion gases;
a plurality of channel walls including a heat transfer augmented channel wall exposed to a flow path of said stream of hot combustion gases in at least one of said combustion chamber and said turbine section, said heat transfer augmented channel wall comprising:
a bulk portion;
a wall surface, and
a plurality of multi-portion indented features arranged in a two-dimensional (2D) array that is periodic in both dimensions of said 2D and is in a staggered row configuration extending from said wall surface into said bulk portion,
wherein said multi-portion indented features each comprise:
a first indented portion, and
at least a second indented portion,
wherein said first indented portion and said second indented portion are divided by a ridge which disrupts fluid flow between said first and second indented portions, and
wherein said ridge has a height that is less than a depth of said multi-portion indented features.

2. The turbine engine of claim 1 ,
wherein said first indented portion comprises a first rim wherein said first rim comprises a first intersection of said first indented portion and said wall surface, said first rim having a first circular profile comprising a first radius and a first midpoint, and
wherein said second indented portion comprises a second rim wherein said second rim comprises a second intersection of said second indented portion and said wall surface, said second rim has a second circular profile comprising a second radius and a second midpoint, said first midpoint and said second midpoint comprising a distance apart less than a sum of said first radius and said second radius, said distance apart being greater than zero.

3. The turbine engine of claim 1 , wherein said plurality of multi-portion indented features are positioned after said combustion chamber in a flow direction of said hot combustion gases.

4. The turbine engine of claim 1 , wherein said first and second indented portions both have a semispherical shape.

5. The turbine engine of claim 1 , wherein said height of said ridge is from twenty to eighty percent of said depth, and wherein said ridge extends across the full width of said multi-portion indented features.

6. The turbine engine of claim 1 , wherein a length dimension of said plurality of multi-portion indented features is aligned at 0 degrees to a flow direction of said stream of hot combustion gases.

7. The turbine engine of claim 1 , wherein said multi-portion indented features are double dimples.

8. The turbine engine of claim 1 , wherein a length dimension of said plurality of multi-portion indented features is aligned from 0 to 30 degrees relative to a flow direction of said stream of hot combustion gases.

9. A method of increasing heat transfer, comprising:
providing at least one heat transfer augmented channel wall within an apparatus that utilizes a hot fluid flow during operation, said channel wall comprising:
a bulk portion;
a wall surface, and
a plurality of multi-portion indented features arranged in a two dimensional (2D) array that is periodic in both dimensions of said 2D and is in a staggered row configuration extending from said wall surface into said bulk portion,
wherein said multi-portion indented features each comprise:
a first indented portion, and
at least a second indented portion, wherein said first indented portion and said second indented portion are divided by a ridge which disrupts fluid flow between said first and second indented portions, and
wherein said ridge has a height that is less than a depth of said multi-portion indented features, and

flowing a hot gas over said channel wall during operation of said apparatus.

10. The method of claim 9 , wherein said apparatus comprises a turbine engine and said channel wall is within a combustor or turbine section of said turbine engine.

11. The method of claim 9 , wherein a length dimension of said plurality of multi-portion indented features is aligned parallel to a flow direction of said hot fluid flow.

12. The method of claim 9 , wherein said first and second indented portions both have a semispherical shape, and said plurality of multi-portion indented features are arranged in a periodic two-dimensional (2D) array.

13. The method of claim 9 , wherein said height of said ridge is from twenty to eighty percent of said maximum depth, and wherein said ridge extends across the full width of said multi-portion indented features.

14. A heat transfer augmented channel wall, comprising:
a bulk portion;
a wall surface, and
a plurality of multi-portion indented features extending from said wall surface into said bulk portion, wherein said multi-portion indented features each comprise:
a first indented portion, and
at least a second indented portion, wherein said first indented portion and said second indented portion are divided by a ridge which disrupts fluid flow between said first and second indented portions, and
wherein said ridge has a height that is less than a depth of said multi-portion indented features, wherein said plurality of multi-portion indented features arranged in a two-dimensional (2D) array that is periodic in both dimensions of said 2D and is in a staggered row configuration.

15. The channel wall of claim 14 , wherein said multi-portion indented features are double dimples.

Assignees

• Slabaugh Carson D
• Kapat Jayanta S
• Univ Central Florida Res Found

Inventors

• Slabaugh Carson D
• Kapat Jayanta S

Classifications

• F05D2250/611

  undulated · CPC title

• F05D2260/20

  Heat transfer, e.g. cooling · CPC title

• F05D2260/2214

  by increasing the heat transfer surface · CPC title

• F02C7/141 Primary

  of working fluid · CPC title

• F28F3/044

  the deformations being pontual, e.g. dimples · CPC title