Doroshenko Y. Scientific bases of assessing the energy consumption and ensuring the efficiency of complex pipeline systems

The dissertation is devoted to the research of movement dynamics of single- and multiphase flows by the shaped elements of complex pipeline systems. The study of the influence regularities of the transportation mode parameters, dispersed phases characteristics, their concentration, geometric shape and geometric parameters of shaped elements of pipelines on energy consumption, erosion wear of complex pipeline systems. A comprehensive study of the stress-strain state of shaped elements of pipeline systems, taking into account the mechanisms of gas-dynamic processes that occur in their internal cavity, the mechanisms of the wall erosion wear. Investigation of the regularities of the technological process of pulling the sleeve by the piston into the pipeline with defective branches, development of the technology for such pipelines trenchless reconstruction. In the dissertation work empirical dependences for determination of coefficients of local resistances, pressure losses of two-phase streams in an internal cavity of shaped elements, definition of intensity of erosion wear of such elements are received. According to the results of numerical and experimental studies, the location of the maximum erosion wear of shaped elements of pipeline systems is determined. An algorithm for three-dimensional modeling of erosion defects of the wall of shaped elements has been developed.