Volumetric efficiency, rau cov twj hydraulic, yog hais txog qhov sib piv ntawm qhov tseeb ntws mus rau qhov theoretical flow. Txog lub tshuab hydraulic, nws yog hais txog qhov sib piv ntawm theoretical flow mus rau qhov ntws tiag.
Kev siv tshuab ua haujlwm, rau cov twj hydraulic, hais txog qhov sib piv ntawm nws qhov kev ntsuas lub zog mus rau qhov tseeb lub zog txhawb. Qhov tseeb tso tawm lub zog ntawm lub cev muaj zog hydraulic yog lub zog loj tom qab qhov kev ntsuas thev dhau lub zog loj dhau kev sib txhuam, yog li nws qhov kev siv tshuab hluav taws xob yog qhov sib piv ntawm qhov tseeb tso tawm lub zog mus rau theoretical lub zog.
Tag nrho cov txiaj ntsig hais txog qhov sib piv ntawm cov hluav taws xob tawm ntawm lub twj tso kua mis (lossis lub zog) rau lub zog fais fab. Tag nrho cov txiaj ntsig yog sib npaug ntawm cov khoom ntawm volumetric efficiency thiab siv tshuab ua haujlwm.
