| 摘要 |
An adjustable louver blade assembly including a number of horizontally extending, movable louver blades (22). Each of the blades is formed in a generally hollow airfoil shaped cross section having a leading edge and a trailing edge. Trips (46,48) for inducing turbulent flow of the boundary layer are embossed on the blade surfaces. Reinforcing spacer ribbons (42) are frictionally secured within each blade to rigidize the blade. The pivotal axis of each blade is located so that the axis is forward of the center of aerodynamic force exerted on the blade for all attitudes of the blade between a closed position and a position about 60 DEG from the closed position. A control rod (26) is connected to each of the louver blades so that all of the blades can be simultaneously swung to any attitude between fully open and fully closed. Each of the blades has chevron shaped slits (60) with inwardly bent tabs near the trailing and leading edges of the blade to guide water on the surface of the blade into the hollow blade. Water is discharged from exit ports (47) at the blade end into open vertical channels (82) in the side frames which conduct water to hollow corner conduits (84) for discharge.
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