Персона: Харитонов, Владимир Степанович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Руководитель научной группы "Теплогидравлика реакторов с водой сверхкритического давления"
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Харитонов
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Владимир Степанович
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- ПубликацияТолько метаданныеHeat transfer in rod bundles cooled by supercritical water – Experimental data and correlations(2020) Churkin, A. N.; Deev, V. I.; Kharitonov, V. S.; Baisov, A. M.; Харитонов, Владимир Степанович; Баисов, Ахмед Магомедович© 2019 Elsevier LtdThe paper presents the results of a comparative evaluation of existing correlations for the prediction of heat transfer to supercritical pressure water against experimental data for bundles of heated rods. It is shown that the method, developed by the authors for the engineering calculation of the heat transfer coefficient in the supercritical region of the coolant parameters, makes it possible to describe the experimental data for smooth rod bundles with an error of less than 15%. In the case of rod bundles with wrapped wire, the same method gives values of the heat transfer coefficient, which are on average about 8% lower compared to the experimental data obtained. This is connected with the intensification of heat transfer due to swirling the flow and can be considered as a margin when estimating the limiting temperature of the heat transfer wall. Based on the comparison of the calculation results by different methods, the problems of choosing the ratio for determining the heat transfer coefficient in fuel assemblies of reactors with supercritical pressure water are discussed.
- ПубликацияТолько метаданныеA New Approach to Generalization of Experimental Data on Heat Transfer to Fluids in Supercritical Region(2020) Deev, V. I.; Kharitonov, V. S.; Baisov, A. M.; Churkin, A. N.; Харитонов, Владимир Степанович; Баисов, Ахмед МагомедовичThe paper contains the results of analysis of heat transfer regimes in the case of forced turbulent flow of water and modeling fluids in channels of various configurations at supercritical pressures. Two new complex criteria were proposed for describing heat transfer in the pseudo-phase transition region. A system of equations suitable for the engineering calculation of heat transfer in fuel assemblies of nuclear supercritical water reactors is presented. A comparison of the calculations of heat transfer coefficient (HTC) with experimental data for the regimes of normal, deteriorated and mixed heat transfer is made.
- ПубликацияТолько метаданныеHydraulic resistance of supercritical pressure water flowing in channels – A survey of literature(2021) Churkin, A. N.; Deev, V. I.; Kharitonov, V. S.; Baisov, A. M.; Харитонов, Владимир Степанович; Баисов, Ахмед Магомедович© 2021 Elsevier B.V.The survey is devoted to the problem of the hydraulic resistance of channels with water at supercritical pressures. The pressure drop in fuel assemblies is one of the main characteristics of water-cooled nuclear reactors. It is expected that pressure drops in SCWRs, which are considered now as a perspective of the IV Generation PWR, may be essentially less than in modern reactors. However, the flow resistance of the reactor equipment, as previously, is an important element among the various parameters of the future plants with SCWR. From 1968 up today, in spite of the obvious peculiarities of hydrodynamics and heat transfer processes in fluids at supercritical pressures, comparatively few experimental investigations of this problem have been carried out. Up to 2000, the experiments at supercritical pressure of water were conducted mainly with smooth round tubes, some data on pressure drops in annular channels were obtained, and it was known only one work in which the hydraulic resistance of a tight-lattice 7-rod bundle with helical fins was studied. Later, the similar investigations began intensively to develop in the People's Republic of China. On the whole, the experimental results, which have been published, are contradictory, and the correlations, based on these data, may be used in limited ranges of geometric and regime parameters. The conclusion was made that there is the urgent necessity to continue the investigations in the here examined field. The purpose of future researches must be the removal of existent contradiction in experimental results, receiving the new data on hydraulic resistance of channels simulating of the real fuel assemblies of SCWRs and the development of general correlations suitable for engineering calculations of hydrodynamic characteristics of the SCWR core in the range of operating parameters.
- ПубликацияТолько метаданныеAnalysis of numerical studies on the thermal-hydraulic and neutronic thermal-hydraulic stability of supercritical water reactors(2021) Sujyan, A. M.; Deev, V. I.; Kharitonov, V. S.; Харитонов, Владимир Степанович
- ПубликацияТолько метаданныеAnalysis of numerical studies into the thermal-hydraulic and coupled neutronic and thermal-hydraulic stability of supercritical water reactors(2021) Sudzhyan, A. M.; Deev, V. I.; Kharitonov, V. S.; Харитонов, Владимир Степанович© 2021 Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University 'MEPhI'. All rights reserved.The paper presents a review of modern studies into the potential types of the supercritical reactor core coolant flow instabilities. Instabilities affect adversely the operating safety of nuclear power plants. Despite an impressive number of numerical studies on the subject, there are problems which remain unsolved. This is largely explained by drawbacks in numerical reactor models. The major of these are the use of one simulated channel instead of a system of two or more parallel channels, the lack of consideration of neutronic feedbacks, and a problem of choosing calculated ratios for the heat-transfer coefficient and the hydraulic resistance coefficient in conditions of a supercritical water flow. Based on this, a decision was made to undertake an analysis which will make it possible to identify these problems and to formulate, on their basis, general requirements to the model of a nuclear reactor with supercritical light-water coolant. The need has been noted for building improved numerical models for the integrated analysis of interlinked hydrodynamic, thermal and neutronic processes in the reactor plant's cooling channels with regard for the peculiarities of the flow and heat exchange in water with highly variable properties.