Accession Number : ADP001936

Title :   Measurements and Calculations of a Separating Boundary-Layer and the Downstream Wake,

Corporate Author : IMPERIAL COLL OF SCIENCE AND TECHNOLOGY LONDON (ENGLAND) DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Adair,D. ; Thompson,B. E. ; Whitelaw,J. H.

Report Date : 1983

Pagination or Media Count : 12

Abstract : A combination of total-head pressure, static-pressure, hot-wire and flying hot-wire probes have been used to quantify the pressure and velocity characteristics of the flow in the vicinity of a trailing flap whose angle of incidence results in boundary layer separation, a large region of recirculating flow and a curved downstream wake. A two-dimensional form of the time-averaged Navier-Stokes equations have been solved numerically with a finite difference grid obtained by a solution of Laplace equation and the results compared with the measurements. The general flow patterns are well calculated ad the results are in close accord in some regions of the flow. In others, including the near-wall region and near wake, significant discrepancies exist and numerical tests suggest that these are due to numerical assumptions although the two-equation turbulence model and related wall functions are also likely to be deficient. (Author)

Descriptors :   *Downstream flow, Boundary layer, Wake, Two dimensional, Flow fields, Navier Stokes equations, Flaps(Control surfaces)

Distribution Statement : APPROVED FOR PUBLIC RELEASE