Wind tunnel wake generator

• US 10,648,882 B2
• Filed: 01/31/2018
• Issued: 05/12/2020
• Est. Priority Date: 01/31/2018
• Status: Active Grant

• Current Assignee: US Department of The Air Force (U.S. Department Of Defense)
• Original Assignee: US Department of The Air Force (U.S. Department Of Defense)
• Inventors: Pickl, Carl, Rutledge, James L., Polanka, Marc D., Crabtree, Brian, Harkless, Christopher
• Primary Examiner(s): Caputo, Lisa M
• Assistant Examiner(s): Plumb, Nigel H
• Application Number:
  US15/884,865
• Publication Number:
  US 20190234830A1
• Time in Patent Office: 832 Days
• CPC Class Codes: F01D 17/08 responsive to condition of working-fluid, e.g. pressure
• CPC Class Codes: G01M 7/02 Vibration-testing by means of a shake table
• CPC Class Codes: G01M 9/04 Details
• CPC Class Codes: G01M 9/062 Wind tunnel balances; Holding devices combined with measuring arrangements
• CPC Class Codes: G01M 9/065 dealing with flow

Abstract

A wake generator for placement in a wind tunnel between a wind source and a test object includes a first frame member having a first track formed thereon, where the first track has a shape including a first side that is substantially rounded and a second side that is substantially flat. The wake generator may include a mounting plate disposed within a perimeter of the first track, where the mounting plate is rotatable relative to the first frame member about a first axis. The wake generator may allow for better simulation of unsteady turbine wakes that influence cooling flow. The wake generator may also include a plurality of bars slidably engaged to the mounting plate and structurally configured to traverse along the first track when the mounting plate is rotated about the first axis.

Claims

1. A method for generating a wake in a wind tunnel, comprising:

aligning a wake generator in a wind tunnel between a wind source and a test object, with a first side of the wake generator facing the wind source and a second side of the wake generator facing the test object;

moving a plurality of bars of the wake generator in a first track defining a predetermined pattern, the predetermined pattern selected to mitigate a reverse wake created by the plurality of bars at the first side of the wake generator and to generate a predetermined wake by the plurality of bars at the second side of the wake generator, wherein the first track on the first side of the wake generator is circular and the second side of the first track is flat; and

pivoting each of the plurality of bars while moving in the predetermined pattern, wherein the plurality of bars are parallel to the first track on the second side of the wake generator.

2. The method of claim 1, further comprising generating the predetermined wake through the moving and the pivoting of the plurality of bars.

3. The method of claim 1, further comprising adjusting the predetermined wake.

4. The method of claim 3, where adjusting the predetermined wake comprises altering a speed of the plurality of bars moving in the predetermined pattern.

5. The method of claim 1, further comprising sliding the plurality of bars relative to a first axis when moving in the predetermined pattern.

6. The method of claim 1, further comprising:

sensing a wake formed by the wake generator in the wind tunnel;

comparing the wake to the predetermined wake; and

adjusting the wake based on the comparison.