Accession Number : ADA261637
Title : Instability of Flow in a Streamwise Corner
Descriptive Note : Contractor rept.
Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA
Personal Author(s) : Dhanak, Manhar R
Report Date : Dec 1992
Pagination or Media Count : 18
Abstract : The linear stability of an incompressible laminar flow in the blending boundary layer between the boundary layer in a 900 streamwise corner and a Blasius boundary layer well away from the corner is examined using a locally parallel flow approximation. It is shown that the influence of the outer boundary conditions associate with oblique modes of disturbances which are anti- symmetric about the bisector plane have a profound effect on the stability of the flow. As a result, in good agreement with observation, the critical streamwise Reynolds number, associated with a spanwise location is significantly reduced as the corner is approached, being R sub cr = 60 approximately for spanwise distance of Z* = 6x*/R from the corner compared with R sub cr = 322 approximately for Z* = 20x*/R solid star R-1, where X* measures downstream distance from the leading edges. At R=600, the growth rate of the most amplified mod of disturbance at the former location is over six times greater than that at the latter; the corresponding wave angle at the two locations is respectively 44 deg and 5 deg, approximately.... Corner flow, Stability.
Descriptors : *LAMINAR FLOW , *INCOMPRESSIBLE FLOW , *STREAMFLOW ANALYSIS , ANGLES , STABILITY , BLENDING , SECONDARY FLOW , BOUNDARY LAYER FLOW , REYNOLDS NUMBER , INSTABILITY , BOUNDARY LAYER , LEADING EDGES
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE