Estimating Fan Flow Rate with Speed & Angle

AI Thread Summary
An equation for estimating the flow rate of a fan can be derived by calculating the axial speed of air based on the fan's blade angle and rotational speed. The flow rate is determined by multiplying this axial speed by the fan's effective area. It is important to consider that the blade angle varies along its span, necessitating the use of pitch to accurately assess performance. The pitch represents the distance the fan would move air if it rotated through a medium like jello. Understanding these factors is crucial for accurate flow rate estimations in simple box fans.
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Is there an equation with which I can estimate the flow rate a fan will generate at a set diameter, speed and angle of the blades? Assume that this is a simple box fan that you would put in your window.

I'm assuming that you would have to determine the axial speed of the air given the angle and rotational speed. Then multiply that by the area.
 
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The angle isn't constant along the span: you need pitch, which is essentially the distance forward it would move if rotated once through jello.
 

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