| 摘要 |
A lift generating body has porous regions and a valve system for controlling flow through these regions for influencing the lift. Preferably flow , 1, approaches the aerodynamic body, 2, at an angle of attack intended to generate lift. The porous surface, 3, on one surface of the body, 2, allows part of the flow to pass through to the other surface, 4, when the valve, 5, is open thus reducing the lift which the body generates. When the valve, 5, is closed flow between the two surfaces is prevented and the aerodynamic body provides the lift as though the surfaces were continuous. The porosity of the porous regions may be anywhere between zero and one, some of the porous regions may be blown with fluid, the porous regions may be on the same side of the body, and the working fluid may be air or water.
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