Accession Number:

ADD019537

Title:

Micro-Electrode and Magnet Array for Microturbulence Control

Descriptive Note:

Patent, Filed 1 May 1997, patented 10 Aug 1999

Corporate Author:

DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s):

Report Date:

1999-08-10

Pagination or Media Count:

11.0

Abstract:

A boundary layer control device for a surface which reduces turbulence by providing forces which counteract microturbulent events occurring at the surface. The microturbulent events occur periodically with a known topography and include liftup and ejection, bursting, low-speed streak and sweep topography. The device has an array of magnet and electrode cells which are arranged to correspond with the topography arrangement of the microturbulent events. The interaction of the magnetic and electric fields within the cells generate a Lorentz force which can be directed into or out of the surface depending on the relative directions of the magnetic and electric fields. Sensors on the surface determine which cells to activate and in what direction to apply the Lorentz force to precisely counteract the microturbulent events occurring at the surface. A force directed away from the surface is used to counteract a sweep event and a force directed towards the surface counteracts a liftup event. No force is applied during low-speed streak events.

Subject Categories:

  • Fluid Mechanics
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE