Patent ID: 9562434
Date: 2017-02-07
CPC Classifications: F01D,F03B,F03D,F05B,Y02E

Claim:
1. An oscillating foil turbine for tapping fluid kinetic energy from a reversible flow comprising: a first foil having a chord length and a first fluid dynamic surface designed to produce lift, mounted to a support for cyclic oscillation in the flow, with substantial motion in a first direction perpendicular to the flow, the first fluid dynamic surface having first and second sides, and the first foil is a reversible foil equally operable in flows in two opposite directions; a second fluid dynamic surface operating in the flow to produce an effective ground parallel to a direction of the flow and perpendicular to the first direction; and a member coupled directly or indirectly to the first foil, adapted to use the motion in the first direction to perform work, wherein throughout a portion of the cycle the first side of the first fluid dynamic surface is separated from the effective ground by less than about 20% of the chord length, and the effective ground has an extent such that at least 80% of the first foil is projected onto the effective ground in the first direction.