Matvienko O. Small-sized axial-flow stage of the borehole pump with increased energy efficiency

The dissertation presents a new solving of the scientific problem, that is to increase the efficiency of small-sized axial-flow stage of the borehole pump. Solving of this problem can reduce the life cycle cost not only of the pump unit, but also of artesian water-supply system. At adequate mathematical models the pictures of the flow in the flow part of low speed small-sized axial-flow stage are obtained, that gives the possibility of qualitative evaluation of losses structure in the flow part that is under investigation. Experimentally rational ranges of basic geometric parameters that most significantly affect the energy characteristics of the stage are established. The method of designing low speed small-sized axial-flow stages (ns = 250 ... 400) accounting the peculiarities of their workflow is created. Based on this method the standard series of small-sized axial-flow stages was created.