INVESTIGATION OF PULSE VIBRATION OF THE PERIODICALLY WORKING INJECTOR OF THE MILKING WASHING SYSTEM

Abstract

As a result of the analysis of technical and technological support of washing of milking installations it is established that the most effective are circulating systems of washing with regulated formation of a stopper mode with use of air injectors on the basis of automatic control. The consequences of periodic operation of the injector is the phenomenon of hydraulic shock, which is caused by a sudden change in the phase distribution of the flow of two-phase washing solution. This leads to a sudden change in the momentum of the two-phase washing solution, causing a pressure wave moving through the system. This pressure wave can lead to the destruction of milk deposits on the walls of the milk line, as well as to possible damage to the equipment of the milk system. The aim of the study is to increase the efficiency of the milking system flushing system by using pulsed vibration of a periodically operating injector. As a result of numerical simulation of the process of washing the milk line of the milking parlor using an injector in the software package STAR-CCM + was determined by the dynamics of changes in vacuum pressure at a distance from the injector (p (0 m), p (1 m), p (2 m), p ( 3 m), p (4 m), p (5 m)) and the dynamics of changes in the content of components of the multiphase medium (washing solution αf, air αg, milk αm) for four options: the injector is constantly closed, the injector is constantly open and the injector is periodically opened (1 s and 9 s) and closes (1 s and 9 s). It is established that the use of a periodic injector allows to reduce the milk content in the milk line faster and by a larger value, which indicates a better washing process. The addition of the physical-mathematical apparatus of the hydraulic shock phenomenon for a periodically operating air injector of the flushing system allowed to establish that the rate of pressure change depends on the velocities and concentrations of phases of two-phase washing solution, ie its flow regime and shock wave propagation velocity. Therefore, the rate of pressure change Δp / Δt is chosen as a criterion for the action of hydraulic shock.