DSpace Collection: The scientific journalThe scientific journalhttp://elar.nung.edu.ua/handle/123456789/502024-01-14T10:35:13Z2024-01-14T10:35:13ZAplication of mathematical metods for condition monitoring of oil and gas facilitiesOlijnyk, A. P.Moroz, A. A.http://elar.nung.edu.ua/handle/123456789/1282016-11-08T13:03:07Z2015-01-01T00:00:00ZTitle: Aplication of mathematical metods for condition monitoring of oil and gas facilities
Authors: Olijnyk, A. P.; Moroz, A. A.
Abstract: Contaminated areas of anthropogenic origin, particularly surface and underground waters as well as soils, have been analyzed. The mathematical models of diffusion processes, based on the use of two- and three-dimensional diffusion equations with a wide range of boundary and initial conditions, have been suggested. It is determined that exact solutions prohibit studying of the peculiarities of their behavior, depending on the type of boundaiy conditions: therefore we suggest using numerical solutions. The difference schemes of the method of variable directions for numerical realization of two-dimensional models in different frames, accounting for environmental heterogeneity of matter distribution have been presented. 'I he schemes allow to measure concentration of substances in real objects through building of functions, modeling various boundary conditions, A software complex for their implementation has been devised and the test findings as well as their analysis have been presented. To model processes which parameters depend on three spatial coordinates, we have suggested numerical schemes for implementing three-dimensional models that are absolutely stable and have the second order of accuracy at all spatial coordinates.2015-01-01T00:00:00ZSimulation of performance characteristics of centrifugal pumps by the electro-hydrodynamic analogy methodKostyshyn, V. S.Kurlyak, P. O.http://elar.nung.edu.ua/handle/123456789/1272016-11-08T13:06:03Z2015-01-01T00:00:00ZTitle: Simulation of performance characteristics of centrifugal pumps by the electro-hydrodynamic analogy method
Authors: Kostyshyn, V. S.; Kurlyak, P. O.
Abstract: Tlie paper specifies the model of oil pipeline centrifugal pump, made on the basis of electro-hydrodynamic analogy method and designed to calculate performance characteristics of the hydraulic machine according to its catalogue data depending on the change of the flow rate and the rotational speed of the pump impeller considering the physical properties of the fluid (its density and kinematic viscosity). The article offers a presentation of mechanical losses as a nonlinear active resistance, the value of which is a quadratic function of the flow rate of a centrifugal pump. This enabled the authors to obtain the formulae for calculating pressure characteristics, power consumed by the driving motor shaft and the machine efficiency depending on the change of flow rate. There is made an investigation of the established operation inodes of main pipeline pumps of NM series by constructing a set of performance characteristics with different values of impeller rotational speed. Performance characteristics of the main pump NM-7000-210 have been calculated and the pump has shown a high convergence of calculated and characteristics obtained experimentally. The offered model of a centrifugal pump is easily adaptable to modem interactive computer-based tools (SIMULINK, 20SIM, PSPICE, etc.) assigned for simulation of operation modes of mechatronic engineering systems, which include pumping stations of main oil pipelines. This method of simulation contributes to the theoretical analysis and optimization of the oil pipeline centrifugal pump efficiency.2015-01-01T00:00:00ZNon-stationare processes in oil-product pipeline using anti-turbulence additivesGrudz, V. Ya.Al-Dandal, R. S.http://elar.nung.edu.ua/handle/123456789/1242016-11-08T13:08:02Z2015-01-01T00:00:00ZTitle: Non-stationare processes in oil-product pipeline using anti-turbulence additives
Authors: Grudz, V. Ya.; Al-Dandal, R. S.
Abstract: The problem of a non-stationary flow of petroleum products by the pipeline in the process of its displacement by anti-turbulence additives is studied in the article. There is made a mathematical model of motion of a contact for two liquid media with different hydraulic characteristics in the pipeline. The model implementation allows predicting the type of motion of the moving boundary, pressure distribution and flow of petroleum products during the process of non-stationary displacement. It is determined that oscillation of parameters in time is negligible, and it allows recommending the quasistationary motion models for predictive calculations.2015-01-01T00:00:00ZDevelopment of vertikal and horizontal vortex type separator for subsea applicationKopey, B. V.Kryvonozhko, T. A.http://elar.nung.edu.ua/handle/123456789/1222016-11-08T13:09:05Z2015-01-01T00:00:00ZTitle: Development of vertikal and horizontal vortex type separator for subsea application
Authors: Kopey, B. V.; Kryvonozhko, T. A.
Abstract: The paper offers the vortex type separator for the four-phase mixture separation in traditional system of separation and redesign or improvement of the vortex type horizontal separator with gravity filter for minimizing the dimension and mass of the separator, collecting sand in a separate tank, enhancing mechanical properties of a multiphase twin-screw pump material by decreasing the hydro-abrasive wear. The mathematical model for the proposed construction of the separator is also elaborated.2015-01-01T00:00:00Z