Flow Separation, Reattachment, and Ventilation of Foils with Sharp Leading Edge at Low Reynolds Number
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD
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Two two-dimensional foils a wedge and a modified Tulin two-term foil were used to study the ventilation of foils with sharp leading edges at low Reynolds number. Flow visualization by dye injection techniques and by tufts was used to determine the reattachment point of the separated streamline in nonventilated flow. The results indicate that if air is forced into a separated region, it is possible to achieve a fully developed cavity. This can be accomplished at speeds too low for any cavitation to occur by resorting to relatively high angles of attack. Hence, it is possible to go directly from noncavitating flow to fully developed cavity flow. Results of pressure measurements over the surface of the curved foil are included.
- Marine Engineering
- Fluid Mechanics