FAN Nozzle effect on the Centrifugal Fan

• Dec 4, 2023

• #2

LittleInch

Petroleum

Mar 27, 2013

22,998

GB

That's an odd looking fan, but that looks like the inlet seal between a higher pressure area and a lower pressure one.

The bigger the gap the worse the recirculating air and loss of efficiency.

Remember - More details = better answers
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• Dec 4, 2023

• #3

Compositepro

Chemical

Oct 22, 2003

7,843

US

The impeller of the blower gives air a velocity. A restriction on the outlet of the blower converts some of this velocity to pressure. The more pressure that you have at the outlet of the blower, the more back-flow of air you will have through this gap, and the more important the size of the gap is. With no backpressure, the gap is unimportant. The shape of the entrance nozzle is important to reducing energy loss due to turbulence in the suction to the blower.

 

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• Dec 4, 2023

• Thread starter
• #4

Curious3110

Mechanical

Dec 4, 2023

7

US

Thanks @LittleInch and @Compositepro.
So in nut shell the closer I maintain the gap between blower and nozzle better my efficiency will be.

 

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• Dec 4, 2023

• #5

M

MintJulep

Mechanical

Jun 12, 2003

10,252

JP

It's common for the inlet bell to end inside the fan wheel.

See, for example, the operations and maintenance manual available here.

https://www.chicagoblower.com/Products/Airfoil-Fans/SQA-Square-Fans

 

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