Laminar boundary layer separation in oscillating flow.
Despard, Ronald Arthur
Miller, James A.
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Laminar boundary layer separation phenomena in oscillating flow was experimentally investigated. Multiple hotwire anemometers were used to obtain instantaneous boundary layer velocity profiles on a model in an oscillating freestream. Certain instantaneous profile behavior was found to be uniquely related to wake formation, while nonwake- inducing transient flow reversals were found to occur throughout the adverse pressure gradient regime. Based on these observations, a practical definition of boundary layer separation in oscillating flows was formulated. Separation data then obtained revealed that the imposition of oscillations caused the separation point to move upstream of its steady flow location. From the data acquired, a parametric correlation of separation point location was developed.
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