Airfoil suitable for forward and reverse flow

Details Airfoil suitable for forward and reverse flow Airfoil suitable for forward and reverse flow

B - Operations, Transporting

64

C

B64C 27/467 (2006.01) B64C 3/14 (2006.01) B64C 27/02 (2006.01)

Patent

CA 2350161

An airfoil has a concave rear top surface, a concave rear bottom surface, and a rounded trailing edge to increase the lift-to-drag ratio of the airfoil at small angles of attack when air is flowing from the trailing edge to the leading edge (reverse flow), while maintaining a high lift-to-drag ratio when air is flowing from the leading edge to the trailing edge (forward flow). The airfoil design results from a performance compromise between forward and reverse airflow. For structural reasons, the thickness of the airfoil in proportion to its chord length may change along the blade radius. Thus, a family of airfoils has been designed that promote low-drag laminar flow with both forward and reverse flow, permit operation of the airfoil with reverse flow over a reasonable range of angles of attack, and achieve high lift with forward flow.

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