Aerodynamic Characteristics of a Curved Plate Airfoil Section at Reynolds Numbers 60,000 and 100,000 and Angles of Attack from Minus 10 to +90 Degrees

摘要

The results of lift and drag measurements on a two dimensional airfoil consisting of a circular arc, steel plate with 10% camber are presented. The measurements involved the determination of the influence of a turbulence inducing spar (diameter 6.67% chord) mounted at different positions around the blade (at the leading edge and at 25% and 50% chord on the upper and lower surfaces). The measurements were performed in a low speed wind tunnel. The results show that a spar position on the low pressure side of the blade leads to a lift-drag ratio of not better than 5. The other spar positions produce lift-drag ratios on the order of 20.