The relevance of the study is determined by the ability of borehole jet pumps to increase the efficiency of technological processes in difficult mountainous and geological conditions. The aim was to establish the laws of transformation of the velocity profile in the production inlet chamber of a borehole jet pump based on the construction and subsequent analysis of the distribution of kinematic parameters of the total working and injected flows. Simulation of the operating process of the ejection system was performed in the ANSYS software and calculation module for four three-dimensional models of a borehole jet pump. The geometric models are constructed with an uneven density of calculation elements in places of complex geometry and a high gradient of hydrodynamic parameters. For each of the studied models, a series of velocity profiles placed at regular intervals at different distances from the pump throat section of the production inlet chamber was constructed. The constructed velocity profiles include sections with uniform and nonlinear distribution of kinematic parameters of mixed flows. It is established that the maximum values of the velocity of mixed flows are present on the axis of the jet pump and are the same for all the studied models. The axial velocity of the mixed flows decreases as the distance to the pump throat section of the production inlet chamber increases. The minimum axial velocity was obtained for a jet pump model with a maximum production inlet chamber length. For two models of a jet pump with a production inlet chamber length of 287 mm and 328 mm, stabilisation of the axial velocity values of the total working and injected flows was obtained. The immutability of kinematic parameters for these jet pump models indicates the completion of the process of equalising the velocities of mixed flows. Taking into account that if the required dimensions of the kinematic stabilisation section are exceeded, hydraulic losses in the flow part of the ejection system increase, its optimal design corresponds to a model with a jet pump production inlet chamber length of 287 mm. The practical value of the study lies in the fact that this design provides the maximum efficiency of a borehole jet pump
Received 28.12.2023
Revised 26.04.2024
Accepted 31.05.2024
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