Method of preventing separation of a fluid flow and flow body system

Patent metadata

Field	Value
Publication number	US-10737772-B2
Application number	US-201715840546-A
Country	US
Kind code	B2
Filing date	Dec 13, 2017
Priority date	Dec 14, 2016
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A method of preventing separation of a fluid flow flowing over a flow surface is described. The method includes generating longitudinal vortices for suppressing or delaying separation of the flow, and enhancing the longitudinal vortices. A flow body system having a flow body and a flow control arrangement is further described.

First claim

The invention claimed is:

1. A method of preventing separation of a fluid flow flowing in a flow direction over a flow surface, comprising:
generating longitudinal vortices for preventing separation of the flow from the flow surface by one or more first flow actuators associated with the flow surface; and
enhancing the longitudinal vortices by one or more second flow actuators associated with the flow surface, wherein each of the one or more second flow actuators is arranged downstream of a respective one of the first flow actuators in the flow direction.

2. The method of claim 1 , wherein for generating the longitudinal vortices there is provided a first actuator row having a plurality of first flow actuators and for enhancing the longitudinal vortices there is provided at least one second actuator row having a plurality of second flow actuators.

3. The method of claim 1 , wherein at least one of the one or more first flow actuators for generating the longitudinal vortices is in a form of a raised element protruding from the flow surface.

4. The method of claim 1 , wherein the longitudinal vortices are generated by blowing a blow-out fluid out of a respective first blow-out opening, formed in the flow surface, of the one or more first flow actuators.

5. The method of claim 4 , wherein the blow-out opening of at least one of the one or more first flow actuators is formed by a slot extending obliquely to the flow direction.

6. The method of claim 4 , wherein the blow-out opening of at least one of the one or more first flow actuators is formed by a bore through which the blow-out fluid is blown out with a directional component perpendicular to the flow direction of the fluid flow.

7. The method of claim 1 , wherein at least one of the one or more second flow actuators for enhancing the longitudinal vortices is in a form of a raised element protruding from the flow surface.

8. The method of claim 1 , wherein the longitudinal vortices are enhanced by blowing blow-out fluid out of a respective blow-out opening, formed in the flow surface, of one or more of the second flow actuators.

9. The method of claim 8 , wherein the blow-out opening of at least one of the one or more second flow actuators is in a form of a slot or bore.

10. The method of claim 1 , further comprising:
measuring at least one flow parameter of the fluid flow in a measuring region located upstream, relative to the flow direction, of the one or more first flow actuators;
determining a target operating condition for the one or more second flow actuators on a basis of the at least one measured flow parameter; and
setting one or more operating condition of the one or more second flow actuators according to the target operating condition.

11. The method of claim 10 , wherein the operating condition includes a blow-out condition for the blowing out of the blow-out fluid.

12. The method of claim 11 , wherein the operating condition includes at least one of a flow direction of the blow-out fluid, a pulse rate with which the blow-out fluid is blown out in a temporally pulsed manner, and a mass flow rate of the blow-out fluid.

13. The method of claim 10 , wherein the operating condition includes a height with which a raised element protrudes from the flow surface.

14. A flow body system having:
a flow body having a flow surface extending in a flow direction; and
a flow control arrangement having one or more first flow actuators associated with the flow surface, which first flow actuators are configured to generate longitudinal vortices, and having one or more second flow actuators associated with the flow surface, wherein each of the one or more second flow actuators is arranged spaced apart from a respective one of the one or more first flow actuators in the flow direction and is configured to enhance the longitudinal vortices generated by the respective one of the one or more first flow actuators.

15. The flow body system of claim 14 , comprising a first actuator row having a plurality of first flow actuators and at least one second actuator row having a plurality of second flow actuators.

16. The flow body system of claim 14 , wherein at least one of the one or more first flow actuators is in a form of a raised element protruding from the flow surface.

17. The flow body system of claim 14 , wherein at least one of the one or more first flow actuators forms a blow-out opening at the flow surface for blowing out blow-out fluid.

18. The flow body system of claim 17 , wherein the blow-out opening of at least one of the one or more first flow actuators is formed by a slot extending obliquely to the flow direction.

19. The flow body system of claim 17 , wherein the blow-out opening of at least one of the one or more first flow actuators is in a form of a bore, a longitudinal axis of which has a directional component perpendicular to the flow direction.

20. The flow body system of claim 14 , wherein at least one of the one or more second flow actuators is in a form of a raised element protruding from the flow surface.

21. The flow body system of claim 14 , wherein at least one of the second flow actuators forms a blow-out opening of the flow surface for blowing out a blow-out fluid for enhancing the longitudinal vortices which can be generated by the flow actuators of the first actuator row.

22. The flow body system according to claim 21 , wherein the blow-out opening of at least one of the one or more second flow actuators is in a form of a slot or bore.

23. An aircraft having a flow body system, the flow body system comprising:
a flow body having a flow surface extending in a flow direction; and
a flow control arrangement having one or more first flow actuators associated with the flow surface, which first flow actuators are configured to generate longitudinal vortices, and having one or more second flow actuators associated with the flow surface, wherein each of the one or more second flow actuators is arranged spaced apart from a respective one of the one or more first flow actuators in the flow direction and is configured to enhance the longitudinal vortices generated by the respective one of the one or more first flow actuators.

Assignees

• Airbus Defence & Space Gmbh

Inventors

• Langenbacher Peter
• Storm Stefan
• Meyer Michael

Classifications

• B64C2230/04

  by actively generating fluid flow · CPC title

• B64C21/02

  by use of slot, ducts, porous areas or the like · CPC title

• F15D1/008

  comprising fluid injection or suction means · CPC title

• F15D1/0055 Primary

  comprising apertures in the surface, through which fluid is withdrawn from or injected into the flow · CPC title

• F15D1/004

  oriented essentially parallel to the direction of flow · CPC title