Fluidlexikon

Volumetric efficiency

The volumetric efficiency describes the ratio of the effective (actually absorbed or issued) flow rate to the theoretical flow rate based on the displacement kinematics and the rotation speed.

For pumps: Effectively delivered flow rate Q 1eff to the theoretically delivered flow rate (displacement volume V 1, drive rotation speed n 2 ):

volumetrischerwirkungsgrad_01.gif

For motors: Theoretically absorbed flow rate Q 2th (displacement volume  V 2, rotation speed n 2 ) to effectively absorbed flow rate.