Relationships between wall pressure and velocity fluctuations in turbulent pipe flow (experimental investigation)
Abstract
Fluctuating components of the wall pressure, of the streamwise velocity, and of the velocity perpendicular to the wall were measured simultaneously in a fully developed, turbulent, pipe flow. Using the method of conditional signal averaging, the relationship between high amplitude pressure fluctuations at the pipe wall and the velocity field in the flow was measured. The measurements show that the occurence of high amplitude positive and negative peaks in the wall pressure are closely connected to the velocity field, which contains long narrow streaks with high and low velocity. The occurence of high amplitude wall pressure peaks is related to the behavior of the velocity field, which is assumed to occur during a burst. A flow model consisting of vortex tubes similar to horseshoe vortices is established, to explain the main features in the measurements.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1981
- Bibcode:
- 1981STIN...8316702L
- Keywords:
-
- Flow Distribution;
- Flow Velocity;
- Pipe Flow;
- Turbulent Flow;
- Wall Pressure;
- Air Flow;
- Dynamic Models;
- Hilsch Tubes;
- Variations;
- Vortices;
- Fluid Mechanics and Heat Transfer