Estimation of the forecast of pump ready rate for reclamation systems

Abstract

The aim of the authors’ research is to improve the hydraulic conditions for supplying the flow to the impeller and to reduce the cavitation wear of the pump working bodies. This goal is achieved by the fact that the device for supplying liquid at the inlet to the pump contains guide elements in the form of flat plates mounted on the axis of the suction pipe. With further modernization, the pumped liquid was stabilized after the impeller, with the elimination of vortex flows along the entire flow path of the pump due to new elements in the pump chamber. The problem is solved by the design of a straightening blade with a free cross-sectional area of the wall channel less than the inner channel. The research methods include the conduct of field and laboratory studies using modern technical means of observation. Long-term experimental work carried out at large pumping stations investigates interconnected systems of connecting structures and pumps. The stability function is determined as a result of taking into account a number of factors: the external environment, technological properties of systems and operational requirements. The change in the critical, from the point of view of the emergence of cavitation, the value of the pump supply from different densities of the pumped liquids was established as a result of bench tests. In the experiments, the cavitation erosion of the growth was compared with analogs in the average 90-100 times. The ratio of the performance of the surface tension force to the density for mercury and water at a temperature of 15° C turned out to be equal to 91. As a result of the development of a new design together with Joint-Stock Company SUVMASH and the method of calculating the working parts of the pump with a minimum wear rate of the pump with a minimum wear rate of 5%.

Irrigation pumping stations according to the hydraulic and operational indicators of pumping units

“…With a fully open valve, the pump head is = 54.8 , the water supply was = 698 / instead of the design = 1000 l/s, i.e., operating point A shifted to point B, and the difference was ∆ = 302 / . Due to the decrease in water supply, the pump's efficiency was 12-15% lower [14][15][16][17][18][19].…”

The adjustment work canal on the Amudarya in the areas of the damless water intake

“…In the studied area, as a result of the displacement of the main stream of the river in the head water intake at a length of 1200 m, the flow concentrated in one canal, the width of which, depending on the water discharge, varied from 250 to 500 m. An island located between the right and middle canals at a length of 2000 m, displaced to the left, towards the middle canal by 200-280 in the head part of the left canal formed a large sandbank. There was also an expansion to 1000 m and an extension to 1200 m of the island located between the middle and left canals [13][14][15][16]. Due to the systematic cleaning of the middle canal, the discharge in it is 80 ... 85 % of the total discharge of the river.…”

Erosion processes during non-stationary cavitation of irrigation pumps

“…However, cavitation is most harmful through its wear and tear. Cavitation in the pumps is explained by the formation of discontinuities in those places where the pressure decreases to saturated vapor pressure at a given temperature, and water boils rapidly with the formation of vapor bubbles, which quickly decrease after passing to the high-pressure zone and the exhaustion of kinetic energy [15][16][17][18][19][20][21][22][23][24][25][26].…”