Small scale structure in the wall region of a turbulent boundary layer
Abstract
The construction and application is reported of an extremely small hot wire X-probe to the measurement of Reynolds stress in the wall region of the turbulent boundary layer of a flat plate at high Reynolds number. The Wyngaard-Lumley constant temperature anemometer used to heat the wire is analyzed, and a direct acoustical frequency calibration of the wire is made. This calibration shows the small wire to have uniform frequency response to 15 kHz. A novel calibration technique is employed using a high speed, digital minicomputer to determine the velocity in the stream direction and in a direction normal to the wall by matching the unique voltage pairs produced by the X-wire array in a turbulent flow to the voltage pairs produced when the probe is exposed to a known uniform flow inclined at various angles.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1975
- Bibcode:
- 1975PhDT........58B
- Keywords:
-
- Flat Plates;
- Hot-Wire Flowmeters;
- Reynolds Stress;
- Turbulent Boundary Layer;
- Calibrating;
- Miniaturization;
- Turbulent Flow;
- Wall Flow;
- Fluid Mechanics and Heat Transfer