Axial Piston Pumps Equation Help

AI Thread Summary
The discussion focuses on the formula for calculating power output in axial piston pumps, specifically P=2rANtan@(p2-p1)n. The user seeks clarification on the required units for each variable in the formula, aiming for a metric system application. They propose using watts for power, meters for radius and area, pascals for pressure, and either RPM or RPS for the rotational speed. Another participant suggests deriving the formula independently and verifying the units as a helpful exercise. The conversation emphasizes the importance of understanding unit conversions in pump design calculations.
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 forumla 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
 
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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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