Several types of trips were compared (zig-zag trips, bump tape, blowing, and two-dimensional trips), and the simple two-dimensional trip was found to yield the greatest improvement. Boundary layer trips were also investigated as a means of reducing drag. Several of the new airfoils show significant performance improvements over previous airfoils. The design philosophy is discussed and verified experimentally. Seventeen of the most promising designs were actually wind tunnel tested. Based on the results of over 40 airfoils tested during the first phase of this program (including the DAE51, FX63–137, E205, E374, E214, E387, Miley, NACA 0009, S3021, S2091, S4233), several new airfoils were designed using the Eppler and Somers code and screened using the Drela and Giles ISES code. Comparisons of data obtained in the Princeton facility with that in several others are presented and show good agreement. Lift and Drag data were taken at chord Reynolds numbers between 0.6 × 10 5 and 3.0 × 10 5. ![]() ![]() The experimental facility and measurement technique are discussed in detail, and turbulence measurements in the tunnel freestream are presented. Both experimental and computational techniques were used. This paper focuses on the development of efficient low Reynolds number airfoils.
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