Brazhenko V. Cleaning of working fluids by a full-flow hydrodynamic filter with a rotating perforated cylinder and a sediment bunker

In the thesis the actual scientific and technical problem is solved - an increase in the efficiency of cleaning of working fluids from mechanical particles by a full-flow hydrodynamic filter, namely a rotational, in which it is proposed to use a rotating discretely perforated cylinder as a filter element and a sludge hopper for collecting the separated particles. On the basis of numerical modeling based on the Navier-Stokes (RANS) averaged Reynolds equations using a shift model of the shifting stresses (SST k-w model) of Menther, a study of the flow of a carrier fluid near the rotating filtering surface and the area of the rotor sink hopper filter. The uneven flow of a fluid in a radial direction through a discretely perforated cylinder is proved. Through the openings located near the inlet to the working area there is more fluid than through the openings, which are as far removed from this section, which adversely affects the implementation of the hydrodynamic effect of cleaning. The evolution of the fluid flow along the holes along the surface of the discretely perforated cylinder, depending on the change in the parameters Ref, Rer, has been studied, and it is shown that with increasing Ref, which characterizes the rotary motion of the liquid, the overlapping of the apertures with the incident flow increases. In the three-dimensional form, the trajectories of the motion of suspended particles near the permeable surface of the filter element have been investigated, the hydrodynamic effect of purification for a discretely perforated cylinder as a filter element has been proved under different flow regimes and the presence of a "buffer zone" is excluded, which excludes the contact of impurity particles with the penetrant cylinder surface. On the basis of an axisymmetric statement, the positive effect of the rotation of the end wall of the filter element on the hydrodynamics of the current, revealed in the containment of the diffusion of vortex zones from the bunker region to the working region of the filter, and the content of the particles in the hopper, was found. The dependence of the filter cleaning efficiency on the relative diameter and density of the particles of impurity and fluid density on the given filter design was obtained. The highest efficiency of the content of impurity particles in the bunker of the cylindrical and conical divergent construction is determined. Experimental studies have been carried out to confirm the efficiency of 95% of the proposed cleaning device from particles of 100-200 mkm AMG-10 fluid and the adequacy of the obtained theoretical results to real physical processes. The difference between the calculated values and the resulting parameters obtained by the experiment was not more than 9%. 7452\К 55.051.03