Electromagnetic Turbulence Control: Salt Water Experiments on an Axisymmetric Body
Abstract
The control of turbulence in a turbulent boundary layer developing over a small axisymmetric cylindrical body in salt water at a moderate Reynolds number is considered in this report. Because near-wall turbulence production has a quasicyclic nature, an attempt is made to perturb the process by means of a periodic Lorenz force. A method of measuring the change in drag due to applied perturbations on a floating cylinder immersed in electrically charged salt water has been developed, and laser Doppler velocimetry measurements of changes in the near-wall mean velocity and turbulence have been carried out. Wall-pressure measurements have also been carried out to determine the effects of perturbation. The skewness and kurtosis of the wall-pressure fluctuation signal were found to increase slowly with the frequency of the Lorenz power pulsing to the microtiles. This pulsing leads to an amplification of wall-pressure spectrum power, which, although weak, provides support to the wall-layer resonance mechanism of the proposed microtiles.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 15, 2001
- Accession Number
- ADA398717
Entities
People
- Daniel P. Thivierge
- John M. Castano
- Joseph Stupak
- Promide R. Bandyopadhyay
- William H. Nedderman
Organizations
- Naval Undersea Warfare Center