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


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261637.pdf


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