Miltykh V. The increasing of pumping station with type D pumps energy efficiency by impellers geometrical parameters influence on pressure characteristics form

The work is focused on the further scientific and methodological support development of the improving the energy efficiency of the pumping station with pumps of type D problem solving by replacing its impellers on the new ones, which are designed with predetermined slope of characteristic curve. According to the scientific and technical information analysis results, the dissertation theme relevance is determined and grounded, its goals and objectives are formulated. The assigned scientific task is solved by affecting on slope of characteristic curve changing impeller outlet width. According to the mathematical modeling results using numerical models, impeller flow patterns are developed and its width output changing effect on its pressure and power characteristics is determined. Slope of characteristic curve mathematical dependence on impeller outlet width is obtained using other type D pumps firm parts elements geometrical dimensions. For type D impellers with ns = 85...160 the slope of characteristic curve change range was firstly defined, which is achieved by impeller outlet width changing under pump operation energy efficiency rate deviation within 5 % from its nominal values. On the basis of the study results, the pumping station with type D pumps functioning mathematical model was refined, using its step control supply, which takes into account hydraulic network characteristics, characteristic curve form and the pump station supply regulating method. The existing impeller calculating method is complemented by slope of characteristic curve from impeller output width for engineering with predetermined slope of characteristic curve, which provides an opportunity to increase energy efficiency of type D pumping units functioning being a part of the pumping stations.