Estimating fan CFM from RPM, HP, and diameter

Question

I am trying to determine the approximate CFM of several axial flow fans being used in agricultural storage in the developing world. The only information the storers have is the power, RPM, and diameter of their fans.

I would like to estimate the CFM at various levels of Static Pressure, and within a range of likely blade pitches.

Is there a way to to do this? I've looked at the fan laws, but it seems like these are meant to calculate changes in variables, not the absolute values of the variables themselves.

Thanks.

Ohio ChemE · Answer

For a particlar fan blade or impeller type an empirical relationship could be developed. I am not familiar with an empirical correlation of this type for fan or blowers. I have seen empirical correlations for liquid mixing impellers with fitting parameters for specific impeller types to estimate power. To know for a specific geometry fan blade without an empirical correlation I believe you would need a sort of finite element analysis.

Answered by Ohio ChemE on January 24, 2021

Estimating fan CFM from RPM, HP, and diameter

One Answer

Add your own answers!

Ask a Question