engleski

Numerical determination of volumetric efficiency of high-pressure reciprocating pumps

Results of experimental determination of variable-discharge high-pressure reciprocating pump performances [3, 4] show that by increasing the pressure on the pressure side of a reciprocating pump, at a constant stroke length, the discharge and volumetric efficiency of the pump decrease. Mathematical expressions defining the theoretical and the actual pump discharge have been derived on the basis of the analysis of kinematic and hydrodynamic performances of a high-pressure, single-piston single-acting pump. The applied measuring system is described and examples of analysed measurement results are given. The Fourier approximation method is used to describe mathematically the experimental diagram of operating pressure p1=f(t). Assuming that physical properties of the fluid are constant, and that geometric and kinematic characteristics of a pump have not changed, the value of volumetric effi ciency is defined as a function of pressure. Results of volumetric efficiency calculation are given for a series of individually performed measurements in the range from H4T25 to H4T250. Results of the numerical determination of volumetric efficiency confirm that the chosen method is acceptable since calculation results differ from experimentally determined values by less than 1%.

Fourier series; variable-discharge reciprocating pump; volumetric efficiency

nije evidentirano