Propeller Design

[PBe]

Hi all,
can any of you out there give me a tip to find a source regarding propeller calc/design? Will try to manufacture a propeller for a mixer.

PBe

 

[albresco]

You could try

http://www.hydrocompinc.com/

They design marine props but they may be able to help

 

[PBe]

Thank you albresco
something to start with.
PBe

 

[abeltio]

try

http://www.sname.org,

they have marine engineering books that include propeller design... depending on the power involved you may want a very efficient propeller or just a crude one.

 

[butelja]

Can you be more specific with regard to the mixer size and what it is trying to accomplish? Marine propellers are used mainly on very small mixers, and must be spun at relatively high speeds. By &quot;small&quot;, I mean generally impellers <12&quot; diameter. If used for large mixers, the high speed requirement and high impeller weight would lead to a very expensive mixer design.

For &quot;large&quot; (12&quot;<D_impeller<120&quot industrial mixers, simpler geometry such as a 45° pitched blade turbine are often used. They will pump large quantities at lower speeds than a marine prop, and have the benefit of a moderate amount of shear, but at lower efficiency. Running at a lower speed simplifies shaft design and vibration problems. There are also other axial impellers that are called hydrofoils, but are in reality bent plates that very roughly approximate a hydrofoil shape. They are more efficient than a pitched blade turbine, but have lower shear. Depending upon the application, the compromise between high shear with low efficiency and low shear with high efficiency must be made.

 

[PBe]

butelja, the only input I have for the mixer is an AC motor running at 1400 r/m and 5.5kW. I guess it will be more easy to manufacture an impeller with turbine blade design compare to an axial impeller.
I thank you all for your response at my question.
PBe