Method of enhancing the aerodynamic performance of a fan

Details Method of enhancing the aerodynamic performance of a fan Method of enhancing the aerodynamic performance of a fan

2005-12-06

2005-12-06

Nguyen, Ninh H. (Department: 3745)

Rotary kinetic fluid motors or pumps

Method of operation

C415S119000, C415S123000

Reexamination Certificate

active

06971840

ABSTRACT:
A fan is modified by replacing its rigid rotor shaft by a flexible shaft so the normal operating speed range is above the first transverse critical speed. During run-up, the assembly of the fan impeller12and the drive shaft11is accelerated rapidly through the first critical speed at which the peak transverse vibrations could be encountered, and during run-down the shaft11is braked to minimize the same exposure to transverse vibrations. The use of a more flexible fan drive shaft of smaller diameter, allows a higher fan operating speed to be used without risk of detrimental shaft aerodynamic chokage effects, and the utilization of the existing fan foundation.

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