Noise control of cavity flows using active and/or passive receptive channels

Patent metadata

Field	Value
Publication number	US-9746010-B2
Application number	US-201514680887-A
Country	US
Kind code	B2
Filing date	Apr 7, 2015
Priority date	Apr 9, 2014
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

An apparatus comprises a surface that is configured to be exposed to a fluid stream and a cavity wall that forms at least a portion of a cavity. A first channel opening is formed in the surface, and a second channel opening is formed in the cavity wall. A channel extends from the first channel opening in the cavity wall to the second channel opening in the surface.

First claim

The invention claimed is:

1. A system, comprising:
a surface configured to be exposed to a fluid stream, wherein a first channel opening is formed in the surface;
a cavity wall that forms at least a portion of a cavity, wherein a second channel opening is formed in the cavity wall, wherein a channel extends from the second channel opening in the cavity wall to the first channel opening in the surface; and
a plasma actuator disposed in the channel.

2. The system of claim 1 , wherein the plasma actuator is among a plurality of plasma actuators disposed in the channel.

3. The system of claim 2 , wherein at least one of the plurality of plasma actuators is configured to produce a first electrohydrodynamic (EHD) body force in a direction that is different from a second EHD body force that is produced by at least one other one of the plurality of plasma actuators.

4. The system of claim 1 , wherein the plasma actuator is configured to be dynamically activated in response to a pressure differential between a first location proximate to the first channel opening and a second location proximate to the second channel opening.

5. The system of claim 1 , wherein the plasma actuator is configured to be dynamically activated in response to a pressure level.

6. A method, comprising:
exposing a surface to a fluid stream, wherein an opening of a cavity is formed in the surface, wherein a channel extends from a first channel opening formed in the surface to a second channel opening formed in a cavity wall that forms at least a portion of the cavity; and
activating a plasma actuator disposed in the channel to adjust a pressure differential associated with the channel.

7. The method of claim 6 , wherein the plasma actuator is activated dynamically in response to the pressure differential.

8. The method of claim 6 , wherein the plasma actuator is among a plurality of plasma actuators disposed in the channel.

9. The method of claim 8 , further comprising:
activating at least one of the plurality of plasma actuators to generate a first electrohydrodynamic (EHD) body force in a first direction; and
activating at least one of the plurality of plasma actuators to generate a second EHD body force in a second direction, wherein the second EHD body force is generated subsequent to the first EHD body force being generated.

10. The method of claim 6 , further comprising measuring a plurality of pressure levels.

11. The method of claim 10 , further comprising calculating the pressure differential using the plurality of pressure levels.

12. The method of claim 6 , wherein exposing the surface to the fluid stream comprises flying an aircraft through air.

13. The method of claim 6 , wherein exposing the surface to the fluid stream comprises causing a fluid to flow through a pipe.

14. An apparatus, comprising:
a surface configured to be exposed to a fluid stream, wherein a first channel opening is formed in the surface;
a cavity wall that forms at least a portion of a cavity, wherein a second channel opening is formed in the cavity wall;
wherein a channel extends from the second channel opening in the cavity wall to the first channel opening in the surface; and
a plasma actuator disposed in the channel.

15. The apparatus of claim 14 , further comprising an additional plasma actuator disposed in the channel, wherein the plasma actuator is configured to produce a first electrohydrodynamic (EHD) body force in a first direction, and wherein the additional plasma actuator is configured to produce a second EHD body force in a second direction that is opposite of the first EHD body force.

16. The apparatus of claim 14 , further comprising an edge member that is separate from at least a portion of the surface and at least a portion of the cavity wall.

17. The apparatus of claim 16 , wherein the edge member comprises a triangular cross section.

18. The apparatus of claim 16 , wherein the edge member comprises a curved exterior edge.

19. The apparatus of claim 14 , wherein the surface comprises an aircraft skin.

Assignees

• Univ Of Florida Res Found
• Univ Florida

Inventors

• Roy Subrata
• Gupta Arnob Das

Classifications

• F15D1/0075

  comprising electromagnetic or electrostatic means for influencing the state of the fluid, e.g. for ionising the fluid or for generating a plasma · CPC title

• F15D1/0025

  using passive means, i.e. without external energy supply · CPC title

• F15D1/12 Primary

  by influencing the boundary layer · CPC title