Data processing and expression of experimental method for hydraulic gear pump
④ Experimental data processing and result expression
a. Data processing. Using the test data and the following calculation formula, the relevant performance indexes of the tested pump are calculated.
Volumetric efficiency:
ηv=V2,e/V2,e=(qv2,e/ne)/(qv2,i/ni) ×100%
Total efficiency:
ηt=(p2,eqv2,e-p1,eqv1,e)/(2πneT1) ×100%
Output hydraulic power in kW:
P2,h=(p2,eqv2,e)/60000×100%
Input mechanical power in kW:
P1m=(2πneT1)/60000
Where qv2, I -- output flow under no-load pressure, L / min;
Qv2, e -- output flow at test pressure, L / min;
Qv1, e -- input flow at test pressure, L / min;
NE -- rotational speed under test pressure, R / min;
Ni -- rotational speed under no-load pressure, R / min;
V2, e -- displacement at test pressure, ml / R;
V2, I -- no load displacement, ml / R;
P2, e -- output test pressure, kPa;
P1, e -- input pressure, which is positive when it is greater than atmospheric pressure and negative when it is less than atmospheric pressure, kPa;
T1 -- input torque, n · M.
b. The results were expressed. The test report shall include test data and relevant characteristic curves. Examples of characteristic curves are shown in figures g and H. The test report shall also provide the information of test personnel, equipment, working conditions and basic characteristics of the tested pump.