Accession Number : ADD016434

Title :   Method and System for Identifying the Onset of a Turbulent Boundary Layer Induced by a Body Moving Through a Fluid Medium.

Descriptive Note : Patent, Filed 2 Sep 93, patented 7 Jun 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Katz, Richard A

Report Date : 07 Jun 1994

Pagination or Media Count : 15

Abstract : A method of detect the onset of turbulence in connection with a body moving through a fluid medium. First, the body is supplied with sensors each for generating a signal suitable for measuring amplitude of pressure fluctuations of the medium proximate a region of said sidewall of the body in at least a region of the body in which turbulence is expected to occur. During a reference stage during which the body moves through the fluid medium when it is known that turbulence is occurring around at least a portion of said body, the sensors each generate reference temporal pressure data representing fluctuations in pressure of the fluid medium around said body. In response to reference temporal pressure data generated by sensors in a turbulence zone at which turbulence is occurring and sensors in a transition zone between the turbulence zone and a laminar flow zone, a method-of-delay phase portrait is generated for each of a progression of selected delay intervals.

Descriptors :   *FLUIDS, *TURBULENT BOUNDARY LAYER, *PATENTS, AMPLITUDE, BODIES, DELAY, FLOW, INTERVALS, LAMINAR FLOW, PHASE, PRESSURE, REGIONS, RESPONSE, SIGNALS, TRANSITIONS, TURBULENCE

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE