Accession Number : ADD015760

Title :   Magnetohydrodynamic Boundary Layer Control System.

Descriptive Note : Patent Application, filed 11 Feb 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Meng, James C

Report Date : 11 Feb 1993

Pagination or Media Count : 11

Abstract : Accordingly, it is an object of the present invention to provide an active boundary layer control system which is lightweight, operates with low in put power, and occupies little physical space. it is a further object of the invention to provide a boundary layer control system which is robust and can be operated ina damaged condition without creating a hazard to the vehicle. It is yet object of the invention to provide a magnetohydrodynamic (MHD) boundary layer control system for marine vehicles which provides a force directly on the water adjacent to the vehicle hull to provide flow separation control. The invention is a boundary layer control system using magnetic and electric fields interaction to providea driving force to energize boundary layer flow around a marine vehicle. A plurality of magnets are located circumferentially around the hull. Seawater electrodes are placed between each of the magnets and between the poles of each magnet.The resulting interaction of the electric and magnetic fields produces a Lorentz force which reduces the turbulence and may even relaminarize the flow in the boundary layer

Descriptors :   *MAGNETOHYDRODYNAMICS, *PATENT APPLICATIONS, *BOUNDARY LAYER CONTROL, TURBULENT BOUNDARY LAYER, VORTICES, SEA WATER, HULLS(MARINE), BOUNDARY LAYER FLOW, DRAG, FLOW NOISE, PERFORMANCE(ENGINEERING), MAGNETIC FIELDS, ELECTRIC FIELDS

Subject Categories : Fluid Mechanics
      Marine Engineering
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE