A fan is to be used as a levitation demonstration. The air blows through the box-enclosed fan of 3 ft diameter blade span area. The weight of the system is 69 lbf. The box is tied up to stop it from rotating. The air velocity is increased by increasing the RPM of fan to create lift. Determine (a) the air exit velocity to produce lift of the system (b) the volumetric flow rate needed, and (c) the minimum mechanical power that must be supplied to the airstream. Take the air density to be 0.078 lbm/ft3.
A fan is to be used as a levitation demonstration. The air blows through the box-enclosed fan of 3 ft diameter blade span area. The weight of the system is 69 lbf. The box is tied up to stop it from rotating. The air velocity is increased by increasing the RPM of fan to create lift. Determine (a) the air exit velocity to produce lift of the system (b) the volumetric flow rate needed, and (c) the minimum mechanical power that must be supplied to the airstream. Take the air density to be 0.078 lbm/ft3.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A fan is to be used as a levitation demonstration. The air blows through the box-enclosed fan of 3 ft diameter blade span area. The weight of the system is 69 lbf. The box is tied up to stop it from rotating. The air velocity is increased by increasing the RPM of fan to create lift. Determine (a) the air exit velocity to produce lift of the system (b) the volumetric flow rate needed, and (c) the minimum
Transcribed Image Text:600 rpm
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