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A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, or squirrel-cage fan (because it looks like a hamster wheel).
Inlet and outlet ducting are often attached to the fan's housing, to supply and/or exhaust the air or gas to the industry's requirements. There are many varieties of centrifugal fans, which may have fan wheels that range from less than 3 cm to over 16 feet (4.9 m) in diameter.
A cross-flow fan is a centrifugal fan in which the air flows straight through the fan instead of at a right angle. The rotor of a cross-flow fan is covered to create a pressure differential. A cross-flow fan has two walls outside the impeller and a thick vortex wall inside. The radial gap decreases in the direction of the impeller rotation.
Aft of the fan, the axial compressor has five stages, after which the gas path progresses to the aft end of the engine. There, it is reversed to flow through a centrifugal compressor stage, the combustors and then the turbine stages. Beyond this, the flow is then reversed again to exit through the fan bypass duct.
Elektrobau Mulfingen GmbH is the parent company of the ebm-papst Group, a manufacturer of electric motors and fans.The group was formed in 2003 from the merger of the companies Elektrobau Mulfingen GmbH & Co. KG (ebm), Papst Motoren GmbH and Motoren Ventilatoren Landshut GmbH and operates international production sites (including in Germany, China and the United States).
The JT15D was first run in 1967. Its use of a centrifugal compressor as the high-pressure stage in a turbofan engine was followed in 1970 by the Garrett TFE731. [1] The fan for the original JT15D-1 was aerodynamically scaled to 75 lb/sec using the much larger JT9D fan. [2] About 70% of the air passing through the fan goes down the bypass duct.
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