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Published January 2008 | Published
Conference Paper Open

Transition in incompressible boundary layers with two-dimensional excrescences


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.

Additional Information

© 2008 Northrop Grumman. The authors would like to thank Lt. Jeff Komives and Dr. Carl Tilmann of the U.S. Air Force Research Laboratory for inspiring and motivating this work and Professor Mike Gaster at Queen Mary College, University of London, for the use of his Rapid-N code. Contributions to the data analysis by Kevin Chen and Christine Siew are also acknowledged.

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Published - AIAA-2008-589-456.pdf


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