Theoretical models and dependences for calculating intensity of hydroabrasive wear of pump working parts

Abstract

The paper presents the results of a theoretical and experimental study of the wear intensity of the elements of the flow part of centrifugal and axial pumps. Theoretical formulas recommended by various authors, obtained for models with flat samples based on energy theory, do not consider the features of hydraulic machines. Considering the movement of a solid particle in the interblade channels of the impellers of centrifugal and axial pumps, we chose design schemes that correspond to hydraulic and physical wear processes. The analysis shows that the action of centrifugal and inertial forces in the interblade channel of the impellers of centrifugal and axial pumps results in the separation and redistribution of solid particles in the flow. As a result, in centrifugal pumps at the end of the blade and axial pumps at the end gap of the impeller, the local concentration of solid particles increases compared to the average. The paper also provides dependencies for calculating the intensity of hydroabrasive wear of pump working parts.

Improvement of water distribution management methods for operating modes of machine channels

“…When solving equations, it is necessary to know the method for determining energy losses due to friction, which is closely related to the study of the velocity structure of the flow during unsteady motion. Due to the lack of experimental data and the necessary theoretical developments, the energy losses to overcome friction forces for unsteady motion when solving the Saint-Venant equations were determined by the uniform motion formula [7,8].…”

Recommendations for the assessment and forecast of shore deformations in the average flow of the Amudarya river

“…where ℎ 0 , ℎ 2 is the height of the water level, respectively, at the opening of the ice cover and at the end of the flood, m; 𝑡 1 is the duration of the rise of the flood from the time of the opening of the ice cover to the onset of the peak of the flood, days; 𝑡 is the duration of the period from the opening of the river to the end of the flood, days, On rivers, the ℎ 0 parameter is defined as the level corresponding to the beginning of the flood. In this case, the duration of the level rise 𝑡 1 and the duration of the entire flood period t should be measured from the actual start of the flood [13][14][15].…”

Method for determining optimal overhaul service of centrifugal and axial pumps

“…values of radial clearances of impellers. The extreme values of the curves Kпр = f1 (t) + f2 (t) will correspond to the effective duration of the operation of the pumps and the maximum allowable values of the radial clearances of the impellers [13][14][15][16].…”