Axial Piston Pumps Equation Help

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SUMMARY

The discussion centers on the formula for calculating power output in axial piston pumps, specifically the equation P=2rANtan@(p2-p1)n. The user, Ed, seeks clarification on the required units for each variable in the formula and confirms that they intend to use metric units: power in Watts, radius in meters, area in square meters, pressure in Pascals, and n in RPM or RPS. The conversation emphasizes the importance of unit consistency in engineering calculations.

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Davieslad
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Right, I am in the process of designing an axial piston pump.

I have obtained the following formula from a textbook for power output. unfortunately i don't know what units the formula requires, is anyone able to confirm what they are? Also, if anyone knows of a good resource for pump design please let me know!

right

P=2rANtan@(p2-p1)n

where

P=power
r=radius of centre of piston from axis
A=area of piston
N=number of pistons
@=swashplate angle
p2 and p1 = pressure differential
n=either rpm or revs per second - i don't know

I need the formula to be in metric form - basically, if i use

P=Watts
r=metres
A=metres^2
p=pascals
n=rpm/rps

Will the formula be correct?

Many Thanks

Ed
 
Engineering news on Phys.org
Have you tried deriving it for yourself? This is always a good start.

At the very least, you should be able to check the units.
 

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