Мелиорация и гидротехника (Nov 2024)
INVESTIGATION OF THE RADIAL VELOCITY OF A LOW-PRESSURE HYDROCYCLONE CLARIFIER OF SURFACE RUNOFF WATERS
Abstract
Purpose: substantiate the design and technological parameters of hydrocyclones-clarifiers by means of a detailed study of the radial velocity in significant sections, namely, at the transition from the cylindrical to the conical part of the apparatus, in the technology of water purification for irrigation. Materials and methods. Modeling and study of the complex process of changing the radial velocity was carried out in two stages. At the first stage, an experiment was carried out on a 170 mm diameter hydrocyclone-clarifier using a numerical method based on the ParaView and OpenFOAM software package, the limit of radial velocity change was established at a given velocity at the inlet to the apparatus, and a database in the form of a matrix was obtained. At the second stage, the obtained array of experimental data describing the velocity change, reflecting the physics of the processes taking place, was subjected to digital analysis to obtain dependencies and extrema of the function. Results. During the experiment and digital analysis it was determined that the extreme minimum value of the radial velocity is observed at the apparatus wall at the point minus 76 at the velocity equal to 13.06 m/s at the hydrocyclone inlet. Under certain conditions, the radial velocity has a zero value; for example, for an apparatus with a diameter of 170 mm in a cross-section of minus 50 mm at the transition from the cylindrical to the conical part, this phenomenon was established at the velocity equal to 18.75 m/s at the hydrocyclone inlet. Conclusions. The data on the change in the radial velocity in the hydrocyclone-clarifier depending on the velocity at the apparatus inlet at each point to the left and to the right of the air cord are summarized. These studies will allow in the future to simulate the optimal design and technological parameters of the hydrocyclone clarifier for the specified natural conditions, which will make it possible to bring the water quality to the requirements acceptable for irrigation.
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