I am trying to figure out what the efficiency loss of a leaking hydraulic cylinder is. This master's thesis found that a controllable pitch propeller (essentially a hydraulic cylinder inside a rotating shaft to control the pitch of the propeller) had external leakage of 0.5 ltr/min at 40 bar and internal leakage of 3 ltr/min at 100 bar. I was wondering if it would be possible to convert these numbers into a rough efficiency loss?
I have been google searching for days to try to find a reference to indicate how to make this calculation. I also went all out and went to a local university library to use Engineering Village -- hoping to find some paper that did an analogous study but couldn't find much to help.
This seems relevant but not sure how to use it: Losses through holes drilled in a pipe