| 摘要 |
<p>The mixing of liquid and liquid suspensions in vessels is obtained by a mixing impeller mounted on a shaft and rotated by a drive which delivers selected speed and torque. The torque and power needed to obtain given flow is minimized by a low-cost impeller having a plurality of blades, each formed from a plate of constant thickness except for a leading edge of rounded profile. Each blade has camber which decreases from the tip to the base thereof. The base can be flat to facilitate the attachment of the blades to the shaft. The blades are oriented and twisted to be at the threshold for flow separation along the width of the blades from the leading to the trailing edge thereof, thereby providing maximum flow in the axial direction before the onset of flow separation. The orientation and twist of the blades provides a generally constant angle of attack along the entire blade from tip to base and the planform of the blade provides for uniform loading, stability and minimization of fluid forces which tend to bend the shaft.</p> |
