EXPERIMENTAL STUDIES WORKSHOP PUMP IN DIFFERENT MODES
Journal Title: Енергетика і автоматика - Year 2018, Vol 0, Issue 1
Abstract
In recent years, the type of new management - the cultivation of high-algae algae as raw materials for pharmacology and perfumery, as well as for food and feed purposes - is developing. At the same time, the absence of adequate means of mechanization of these technologies in Ukraine constrains this process, in particular, in the cultivation of algal spirulina, there are no effective means for pumping a suspension of culture. The purpose of the work is to substantiate and adjust the ratio between the pressure on the liquid, the productivity, power and the speed of the rotor of the impeller. The analysis of the axial pump operation was carried out using the provisions of the theory of hydraulics of liquids and statistical methods for processing the results of research on an experimental installation in the MathCAD, Excel system. Experimentally determined numerical values of the efficiency coefficients for the developed axial pump at different rotational speeds of the impeller. All efficiency except hydraulic, with increase of rotation frequency of a pump impeller increase. The increase in mechanical efficiency is explained by the fact that the increase in the speed of rotation increases the supply height. This leads to an increase in drive power. Mechanical losses of power practically remain unchanged, that is, their share in the general background of the use of power falls, which is reflected in the mechanical efficiency. Increasing the volume efficiency at an increase in the speed of rotation is associated with a decrease in leakage through the gap between the impeller and the pump housing. Reducing hydraulic losses when reducing the speed of rotation is associated with a decrease in the speed of fluid flow through the pump, that is, reducing vortices, losses on impact at the entrance and exit. When operating a pump in a closed network and reducing the rotational speed of the impeller by more than 10 % of the rated power, supply, and pressure for this pump at the current rotational speed, the ratio of these parameters to the fractional components of the efficiency of the pump must be entered. The calculation error does not exceed 5 %.
Authors and Affiliations
І. М. Голодний
Keywords
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