Justification of parameters of vacuum pumping means with pulsating active flow for cattle farms

Abstract

One of the main components of the technological processes of animal husbandry are vacuum pumping means designed for dosing, mixing, transportation, feed preparation and feed distribution lines, milking cows, milk processing, as well as a large number of technological processes in agriculture. The article deals with a pulsating jet vacuum pumping device, widely used in all industries and agriculture, the feature of which is to improve the parameters of the technical characteristics of the pump without direct expenditure of mechanical energy with a simple design. In pulsating jet vacuum pumping devices, non-stationary modes are created intentionally to increase the ejection coefficient, productivity, etc. The pulsating flows of the transported materials are very diverse, this is due to the increased number of similarity numbers that determine their mode. If the reduced velocity and the Reynolds number are usually used for a stationary flow, for a pulsating flow, the relative frequency and the relative amplitude of the pulsations are added to them. The objects of experimental research were ejectors with pulsating motion of the active flow. The main task of the experiments was to determine the most effective indicators of the ejectors, such as the degree of pressure increase, the ejection coefficient and the geometric parameter. As a result of the experiment, the regularities of changes in the performance of a pulsating jet vacuum pumping device were obtained depending on the valve material and the magnitude of its pulsation. It is revealed that for an ejector with a pulsating movement of the active flow, the recommended valve material is a metal ball, with a pulsation frequency of 90 ... 100 min -1 . As a result of the application of the proposed ejector with pulsating movement of the active flow, the transportation capacity will increase by 14.5%.