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.