| 摘要 |
An air moving system for moving air in ducts (35), including a motor (17), having a shaft (19) for rotation about an axis (23) with the shaft extending axially from the motor in the opposite direction from the desired air flow (33). An inner hub (25) is mounted on the shaft, the hub having an elliptical face for directing air around said hub. A plurality of rotor blades (27) are mounted on the hub for pulling air from the face to discharge the desired airflow into the air ducts. A housing (13) surrounds the motor and blades providing a cylindrical clearance (31) between the housing and the outward tip of the blades as they rotate. The blades having a mean camber line producing maximum lift and minimum drag, and the blades having a twist by providing uniform flow over the blade length from hub to tip. |
