| 摘要 |
A movable sheet (22) overlying a wing (20) is disclosed that creates laminar flow over its exposed surface. The movable sheet (22) serves as a shield for protecting a suction support structure (24) of a wing (20) against contamination, and also serves as a movable, conductive substrate (80) for deicing. The invention includes a movable sheet (22) that is mounted scrolllike on two motor-driven rollers (38 and 40). The sheet (22) has a solid area without perforations that protects the suction support structure (24) from contamination, and a porous area (26) with perforations therethrough that allows boundary layer suction. The motor-driven rollers (38 and 40) scroll the sheet (22) to cover the suction support structure (24) with either the solid area or the perforations of the sheet (22). Contact rollers (82) at the edge of the sheet (22) supply electrical current to resistively heat the sheet (22) and melt any accumulated ice. The movable sheet (22) can also be moved back and forth to dislodge the ice. |
