Dave Dickey Forum Moderator 275 Posts
Re: Will a change occur in impeller power number if we change the blade angle?26 October 2010 at 1:29pm
Blade angle is measured from the horizontal. So increasing the blade angle from 45 degrees to 60 degrees will increase the power number from 1.37 to 2.32. That increase of 70% will be reflected in an increased power requirement. Calculating the power requirement follows the same calculation method provided previously, but with the new power number.
Calculating the power number requires the use of computational fluid dynamics (CFD) analysis. Most power numbers are obtained experimentally.
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