The Wall Erosion in a Vortex Chamber Supercharger Due to Pumping Abrasive Mediums

摘要

The rapid wall erosion of the settings of pump elements occurs during pumping of two-phase mediums, in the hydraulic and pneumatic transport systems. In these circumstances, it is reasonable to use the jet technology in general and the vortex chamber superchargers in particular. The vortex chamber superchargers have the best, compared with other jet superchargers, energy efficiency indicators during pumping of bulk materials. The purpose of the article is to study the wall erosion of the vortex chamber. The mathematical modeling of the flow is carried out by solving the averaged Reynolds equations using a SST turbulence model corrected. Simultaneously with the hydrodynamic calculations the trajectories of abrasive material solid particles were calculated. Finney's model was used to model the wall erosion. It is found that for all values of the flow rates and, accordingly, the concentration of solid particles, a uniform wear of the vortex chamber is observed. To ensure the durability of superchargers it is necessary to increase the thickness of the chamber's walls. In the process of wear, the ratio of diameters of the inflow channels to the diameter of the vortex chamber will increase. It affects the energy characteristics of the supercharger: the efficiency, the amount of medium at the outflow of the device, the vacuum value near the axis. By setting minimum acceptable parameters it is possible to predict the wear of the chamber and calculate the resource of the supercharger without the use of expensive experimental investigations.