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Mechanical Engineering Department
Michigan State University
Abstract-
Molecular tagging velocimetry is used to investigate unsteady
boundary layer separation in two different flows. One involves the
approach of a vortex ring toward a fixed solid wall at normal incidence,
and the other considers the leading edge of an airfoil pitching to a
high angle of attack. The measurements have sufficient spatial and
temporal resolution to reveal the details of the boundary layer
separation process. Comparisons are made with previous boundary
layer computations of vortex-wall interaction and full Navier-Stokes
computations of pitching airfoils. Results from the pitching airfoil
experiment show that the temporal and spatial scales at the onset of
boundary layer separation are smaller than those captured by previous
computational studies.
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