Title:
【発明の名称】電磁装置と境界層制御法
Document Type and Number:
Japanese Patent JPH07508335
Kind Code:
A
Abstract:
The boundary layer of a fluid travelling in a mean-flow direction relative to a surface of a wall of a body is controlled by generating in a near-wall region of the flow a magnetic field &upbar& B having flux lines parallel to the surface of the wall and an electric current density &upbar& J traversing the magnetic flux lines in the fluid. An electrolyte or other conductivity-enhancing material is introduced into the flow to provide an electrical conductivity gradient in the near-wall region. The magnetic field &upbar& B and the electric current density &upbar& J create in the fluid a force &upbar& Jx &upbar& B having a component normal to the surface of the wall that because of the increased conductivity gradient near the surface can stabilize or destabilize flow in the boundary layer. Numerous aspects of the fluid flow and its interaction with the body can thus be controlled. As examples, shear stress in the fluid at the wall can be decreased, with a corresponding reduction in viscous drag, the characteristics of the acoustic and pressure fields in the fluid surrounding the body can be controlled to reduce noise and fatigue, and boundary layer separation can be inhibited or induced.
Inventors:
Nocentuk, Daniel, M.
Brown, Gerry, Elle.
Brown, Gerry, Elle.
Application Number:
JP50259294A
Publication Date:
September 14, 1995
Filing Date:
June 25, 1993
Export Citation:
Assignee:
British Technology Group USA, Inc.
International Classes:
B63B1/34; B64C21/00; F15D1/12; F28F13/02; (IPC1-7): F15D1/12; B63B1/34; B64C21/00
Attorney, Agent or Firm:
Masao Okabe (8 others)