Experiments in bypass boundary layer transition under a stream with and without shear

Effect of mean flow shear on bypass boundary layer transition is investigated experimentally in a low-speed wind tunnel. To initiate bypass transition on a flat plate, the level of freestream turbulence is intensionally enhanced using a uniform parallel rod grid and a non-uniform parallel rod grid....

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2017-04, Vol.822 (1), p.12015
Main Authors: Balamurugan, G, Mandal, Alakesh C
Format: Article
Language:English
Subjects:
Boundary layer transition
Flat plates
Low speed wind tunnels
Multinational space ventures
Particle image velocimetry
Physics
Shear
Space shuttle
Turbulence
Velocity distribution
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Effect of mean flow shear on bypass boundary layer transition is investigated experimentally in a low-speed wind tunnel. To initiate bypass transition on a flat plate, the level of freestream turbulence is intensionally enhanced using a uniform parallel rod grid and a non-uniform parallel rod grid. The non-uniform grid produces a mean velocity profile with shear, and therefore, turbulence production due to this shear will be non-zero compared to a uniform grid which produces a mean velocity profile without shear. The growth rate of the disturbance energy for the non-uniform grid is found to be higher compared to the uniform grid. The intermittency values are also found to be higher for the non-uniform grid under same flow conditions. Particle Image Velocimetry (PIV) measurements in the spanwise plane reveal instability characteristics similar to the one reported in the literature.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/822/1/012015