| 摘要 |
An airfoil (30) arranged for use in a fluid flow of varying direction relative to the airfoil, has arranged thereon a plural axis hinge (50) for automatic adjustment of the angle of pitch of the airfoil. The airfoil can be applied to a rotary crossflow device for use in a fluid flow of varying apparent flow direction, an oscillating device for use in a fluid flow, a force generation device for use in a fluid flow of varying direction, or a flow control device for use in a fluid flow of alternating direction. |
