Stroke-wing engine with dualwings for extracting power from an Airstream

Abstract

An oscillating wing exposed to a uniform fluid flow and performing a coupled plunging and pitching motion either produces thrust or extracts energy. The amplitude ratio of the two degrees of freedom determines the respective mode. A stroke-wing engine operates in the mode in which energy is gained. The strokewing engine with dual wings enhances the efficiency of the single wing machine. Two wings work in opposite direction and take advantage of the interference effects between the neighbouring wings. Numerical and experimental results are presented for a stroke-wing engine with dual wings. The technology carrier DualWingGenerator operates in air and is intended to compete with wind turbines at selected sites with medium-range wind velocities.