Patent ID: 6357464
Filing Date: 2002-03-19
Classification: B63B,F15D,F42B,Y02T,Y10T

Abstract:
A method of reducing the dissipation rate of a second fluid ejected into the boundary layer of a first fluid flowing relative to a first surface, said method comprising the following steps:(a) forming pairs of GÃ¶rtler vortices, using an upstream concave surface that forms a chamber under the first surface, wherein the vortices are shed, ejected, and flow downstream along the first surface; (b) releasing the second fluid into a region consisting substantially of only the near-wall region of a boundary layer of the first fluid by causing the second fluid to flow over a convex Coanda surface as it enters the flow path of the first fluid, said convex Coanda surface being located on the downstream side of a slot through which the second fluid enters the flow path; and (c) controlling the ejection velocity of the second fluid such that the convex Coanda surface directs the flow of the second fluid into the first fluid so that the flow lines of second fluid are substantially parallel to the flow lines of the first fluid.