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Series of R&D on improvement of thermohydraulic efficiency and reliability of power facilities


Presented National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”.

Dr. of Sc. Pismennyy E.N., Dr. of Sc. Korolyov A.V., Dr. of Sc. Kozlov I.L., Dr. of Sc. Oborskiy G.A., Pavlyshyn P.Y., Cand. of Sc. Gershuni A.N., Cand. of Sc. Nishchik A.P., Cand. of Sc. Razumovskiy V.G.

The goal of the work is to increase the efficiency, reliability and safety of power plants’ operation due to in-depth analysis, intensification and optimization of thermophysical processes in power equipment, development and implementation of scientifically sound technical solutions on its improvement.

This is a complex of fundamental-and-applied R&Ds on the processes in steam-fluid flows, particularly, on thermoacoustic phenomena and thermodynamic instability, on heat transfer and hydraulic resistance of the fuel assemblies cooled by supercritical water in the reactors of the 4th generation under the rated conditions and the conditions close to heat-transfer deterioration, on convective heat exchange in extended surfaces, on high-performance heat-transferring evaporation-and-condensation systems, on optimization of efficient strategies of power facility maintainability. Significant part of the results is unique.

The work is on provision of reliable prediction of critical phenomena and dangerous accidents, on development of the methods of their prevention, on improvement of heat transfer efficiency, advancement both of passive heat transfer/ removal and of thermal shielding.

The carried out studies clarified: physical mechanism of self-organization of two-phase flow transition to its crisis mode; the reasons of acoustic phenomena in occurrence of high-parameters coolant leakage; the criterion both of revealing power fittings damage and of checking their tightness during incoming inspection; behavior of a two-phase flow through the pipeline sections with local hydraulic resistances; the ways of reducing of such pipeline vibration; determining criterion of optimization of efficient strategies of power equipment reliability management. As a result of complex thermophysical studies of thermohydraulics under supercritical parameters of the coolant in the fuel assemblies of promising nuclear reactors, convective heat transfer in developed heat-transferring surfaces and heat-transferring characteristics of evaporation-and-condensation systems, new regularities of the processes were discovered and analyzed, new methods for intensifying heat transfer were proposed. On this basis, functional correlations for calculation and optimization of the parameters of heat-transferring systems were determined and the methods of their rational designing were developed.

The results of the performed studies are implemented in the compulsory normative documents on design of the boilers and convective surfaces, heat recovery units and other high-performance heat exchanging devices that lead to a significant increase in the energy efficiency of the basic equipment, are realized in new technical solutions on passive heat removal and thermal protection systems to strengthen safety barriers in nuclear power engineering. Introduction of only some of the work’s results into the Ukrainian nuclear engineering provides UAH 773.2 mln economic effect. The devices, methods, and recommendations developed and implemented are original.

Number of publications: 17 monographs (5 of them are edited abroad), 9 textbooks and tutorials, 520 papers including 76 in foreign journals with impact-factor, are reflected in 18 patents of Ukraine on invention including unexpired one, 3 foreign patents, 6 patents on industrial model, 93 patents on utility model. Total number of the references to the authors’ publications/ h-index in Scopus is 183/6, in Web of Science is 41/4, and in Google Scholar is 1000/13. On the topic of the work, 9 doctoral and 34 candidate dissertations have been defended.