Abstract
In the article, aerodynamic resistance of the stope face is studied in case of selective mining the coal seam. To carry out the research, the methodology of the computational experiment for evaluating the longwall face aerodynamic resistance influence on the efficiency of airing the stope face has been substantiated. The model of the stope face section, equipped with mining and backfilling mechanized complex based on the serial 1KD90 roof support has been developed in the 3D modeling software SolidWorks. The diagrams of the air stream velocity distribution, when it flows in the cross section of the longwall face working space with different positions of stoping equipment and the values of rock-cutting thickness of the seam bottom (rock ledge) have been obtained in the environment of computational module FlowSimulation. The pressure drop along the length of the aerodynamic model of the stope face section has been assessed. The dependences of the average velocity of the air stream flow on the value of rock-cutting thickness have been obtained. The obtained results can be used to improve and modernize the elements of mining and backfilling mechanized complex of machinery and equipment, as well as the technology for selective mining of thin and very thin coal seams in the Western Donbas.
Highlights
Studying aerodynamic parameters of mine workings is one of the key tasks in the process of mine ventilation design
Main objective of the study is to develop a methodology for evaluating aerodynamic resistance of a longwall as for the efficiency of stope ventilation
Analysis of the results as for distribution of air flow velocity and pressure difference fields being evaluated according to the cross section of the modeled production unit (Figs. 3 and 4)
Summary
Studying aerodynamic parameters of mine workings is one of the key tasks in the process of mine ventilation design. The researchers analyzed ventilation stability in terms of general aerodynamic mine working resistance determined either analytically or experimentally [1 – 6] Nowadays, such studies are little if any. Changes in the geometry of internal flow boundaries result in local resistances having considerable effect upon the air flow velocity or longwall direction They occur in mine workings in case of distortion of the flow section (by sudden widening or narrowing of a mine working; turning, division, or merging of flows etc.). Where Сx is dimensionless coefficient of front resistance depending upon Reynolds number and geometry of an object; Sb is area of object projection to the mine working cross section, m2; v is velocity of the oncoming air flow, m/s. Main objective of the study is to develop a methodology for evaluating aerodynamic resistance of a longwall as for the efficiency of stope ventilation
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