Calculating Pump Power
Calculating Pump Power
(OP)
Hey so Ive been asked by my work to design a display model that needs to be able to flow 0.05-0.15 cms. They have told me to use an impeller assembly from a jet ski for the pump and want me to size an electric motor that will be capable of delivering the power required to pump the water. The only things that I know are: the maximum thrust generated from the impeller (lbf), the rpm of the shaft to generate the maximum thrust, the horsepower of the motor used to generate the maximum thrust, the angle of the impeller blade, and the required flow rate for the model. Does anyone have any suggestions on how to calculate the required horsepower needed to power one impeller and have it generate the flows I need? Thanks in advance for any advice.
Taylor
Taylor





RE: Calculating Pump Power
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RE: Calculating Pump Power
Power required is simply - flow x head produced / pump efficiency and has nothing to do with speed, blade angles or thrust.
Your posting is also very confusing in that you say you already have this information:
"The only things that I know are: the maximum thrust generated from the impeller (lbf), the rpm of the shaft to generate the maximum thrust, the horsepower of the motor used to generate the maximum thrust, the angle of the impeller blade, and the required flow rate for the model."
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Calculating Pump Power
RE: Calculating Pump Power
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Calculating Pump Power
Here is a link that gets more involved with impeller angle and length of blades to develop an equation for thrust. Just use density of water instead of air.
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RE: Calculating Pump Power
Let your acquaintances be many, but your advisors one in a thousand' ... Book of Ecclesiasticus