Диаграммы производительности судовых вакуумных рыбонасосных установок

Abstract

The article presents the analysis of performance diagrams of marine vacuum fish-pumping units based on Ocean Master water-ring compressor machines published in the domain by Samson Pumps. The diagrams represent the dependence of the flow rate of the water-fish mixture on the given level difference at different values of the rotor speed for two stages of the plant operation. These experimental dependences are well approximated by 3rd-order polynomials over the entire range of acceptable argument values. The calculation of the values of the adjusted determination indices showed that at a rotor speed of 20 s-1 or more the degree of the polynomial can be reduced to the second power. Contour graphs of the performance of vacuum fish pumping units at each stage of their operation were constructed. The argument values for a given feed can be determined from these graphs. They allowed to set the scope of arguments in which the unit would not work. The formula for the performance of vacuum fish pumping units for the full cycle of operation is obtained on the basis of regression models. The maximal performance of the investigated vacuum fish-pumping units indicated in the technical documentation refers to the individual stages of their operation. The performance for a full cycle of work in real conditions can be 5-10 % of the maximum. The obtained analytical expressions can be used in the practical application of performance diagrams of vacuum fish-pumping units, taking into account the hydraulic head losses in the pipeline.