Abstract
The effect of changing the pitch to diameter ratio (P/D) of a row of round, wall-normal, zero-net-mass-flux (ZNMF) jets located at the leading edge of a NACA 0015 airfoil was investigated. A parametric study and particle image velocimetry (PIV) measurements were conducted on a two-dimensional airfoil in a water tunnel at a Reynolds number of 6.56 ×104. Different optimal forcing frequencies and percentage lift increases between the two P/D cases were observed. It is possible that differences in jet interaction mechanisms may have caused the differences in control effectiveness between P/D cases. Time-averaged streamlines indicate a reduction in the size of a recirculation region over the upper surface of the airfoil may be causing the improved lift.
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Stephens, T., Soria, J. (2008). High Resolution PIV Study of Zero-Net-Mass-Flow Lift Enhancement of NACA 0015 Airfoil at High Angles of Attack. In: Morrison, J.F., Birch, D.M., Lavoie, P. (eds) IUTAM Symposium on Flow Control and MEMS. IUTAM Bookseries, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6858-4_19
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DOI: https://doi.org/10.1007/978-1-4020-6858-4_19
Publisher Name: Springer, Dordrecht
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