| 摘要 |
A variable guide vane for a gas turbine engine comprises a fixed portion arranged on an upstream side, a movable flap arranged on a downstream side and a transfer slot defined between a trailing surface of the fixed portion and a leading surface of the movable flap. The movable flap has opposite pressure and suction sides extending along a chord line between leading and trailing edges, and is rotatable about an axis extending along a span of the movable flap over a range of angular positions between open and closed. The trailing surface has a substantially U-shaped profile with a first branch extending partially around the pressure side of the movable flap, and an opposite second branch extending partially around the suction side of the movable flap. The transfer slot has an inlet port arranged on the pressure side of the movable flap and an exhaust port arranged on the suction side of the movable flap. In use, in the closed position the suction side contacts the second branch to close the exhaust port, and in the open position the second branch directs a first air flow passing through the transfer slot tangentially over the suction surface of the movable flap. |
