Transition in incompressible boundary layers with two-dimensional excrescences
2008
An experimental investigation of the transition process in boundary layers subjected
to forward- or aft-facing two-dimensional step excrescences is described. The objective of
the work was to characterize the variation of transition Reynolds numbers with measurable
roughness and boundary layer parameters, with the specific goal of specifying new tolerance
criteria for laminar flow airfoils, alongside a fundamental investigation of linear boundary
layer stability mechanisms. Results from an ongoing program of increasing complexity on
effects of pressure gradient on excrescence-induced transition are presented. Preliminary
N-factor calculations are used to determine the effects of boundary layer stability and
attempt to isolate the effect of the disturbance due to the excrescence.
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