Персона: Корсун, Александр Сергеевич
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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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Александр Сергеевич
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- ПубликацияТолько метаданныеSimulation of Heat and Mass Transfer in Wire-Wrapped Fuel Assemblies in the Anisotropic Porous Body Approximation(2020) Chudanov, V. V.; Aksenova, A. E.; Pervichko, V. A.; Korsun, A. S.; Merinov, I. G.; Kharitonov, V. S.; Bayaskhalanov, M. V.; Корсун, Александр Сергеевич; Меринов, Игорь Геннадьевич; Харитонов, Владимир Степанович; Баясхаланов, Михаил Валерьевич© 2020, Pleiades Publishing, Inc.Abstract: Results of the simulation of heat and mass transfer in wire-wrapped fuel assemblies in the anisotropic porous body approximation using the developed APMod software package are presented. The modifications introduced into the porous body model to make it suitable for wire-wrapped fuel assemblies are described. The predictions of thermal and hydraulic characteristics in the liquid-metal cooled experimental and model fuel assemblies according to this updated model are presented. An isothermal sodium flow in a Bundle 2A experimental 19-rod wire-wrapped assembly and uniform or nonuniform heating of the rods was studied. The predictions were compared with the experiments using the pressure difference across the assembly versus the coolant flowrate and the coolant temperature distribution in the assembly’s outlet section. The thermal–hydraulic characteristics in the BN-1200 reactor fuel assembly’s heated 19-rod fragment with its flow cross-section locally blocked in the central part calculated by the porous body model were compared with the predictions by the CONV-3D DNS code. Before their comparison, the distributions of local velocities, pressure, and temperature in an assembly cross-section calculated by the CONV-3D code were averaged over the averaging cells in the APMod software package. It is demonstrated that the APMod software package may be used to calculate parameters, which are averaged over a representative averaging cell, in a liquid-metal coolant flow in wire-wrapped fuel assemblies with an accuracy adequate for engineering applications.
- ПубликацияТолько метаданныеNumerical Simulation of Thermal–Hydraulic Processes in Liquid-Metal Cooled Fuel Assemblies in the Anisotropic Porous Body Approximation(2019) Chudanov, V. V.; Aksenova, A. E.; Pervichko, V. A.; Korsun, A. S.; Merinov, I. G.; Kharitonov, V. S.; Bayaskhalanov, M. V.; Корсун, Александр Сергеевич; Меринов, Игорь Геннадьевич; Харитонов, Владимир Степанович; Баясхаланов, Михаил Валерьевич© 2019, Pleiades Publishing, Inc.Abstract—: The article presents an anisotropic porous body model in which the transfer anisotropy is taken into account through determining—by means of tensor analysis techniques—the drag force, effective viscosity, and thermal conductivity. The model is intended for describing heat-and-mass transfer in fuel assemblies and tube bundles. For closing the system of anisotropic porous body equations, the integral turbulence model developed by the authors is used. To verify how correctly the hydrodynamics and heat transfer are described, a few hydrodynamic and thermal–hydraulic processes in water- and liquid-metal-cooled fuel rod assemblies are simulated in the anisotropic porous body approximation. The results from simulating the flow patterns of lead–bismuth eutectics in the experimental 19-rod assembly and water in a 61-rod nonheated assembly with its flow cross-section locally blocked in the central and corner parts are presented. The thermal–hydraulic processes in the BREST reactor fuel assembly’s heated 19-rod fragment with its flow cross-section locally blocked in the central part were also simulated using the CONV-3D DNS code in the framework of model cross-verification activities. The numerical analysis was carried out using the developed APMod software module implementing the anisotropic porous body model jointly with the integral turbulence model. It was demonstrated from a comparison of the numerical analysis results with both experimental data and simulation results obtained using the CONV-3D computer code that the APMod software module adequately describes the 3D fields of coolant velocities, pressure, and temperature arising in fuel rod assemblies with a locally blocked part of their flow section. The obtained results testify that the anisotropic porous body model can be used for simulating thermal–hydraulic processes in the cores and heat-transfer equipment of prospective reactors.
- ПубликацияОткрытый доступInherent Safety Characteristics of Advanced Fast Reactors(IOP Publishing Ltd, 2017) Bochkarev, A. S.; Korsun, A. S.; Kharitonov, V. S.; Alekseev, P. N.; Бочкарев, Алексей Сергеевич; Харитонов, Владимир Степанович; Корсун, Александр СергеевичThe study presents SFR transient performance for ULOF events initiated by pump trip and pump seizure with simultaneous failure of all shutdown systems in both cases. The most severe cases leading to the pin cladding rupture and possible sodium boiling are demonstrated. The impact of various features on SFR inherent safety performance for ULOF events was analysed. The decrease in hydraulic resistance of primary loop and increase in primary pump coast down time were investigated. Performing analysis resulted in a set of recommendations to varying parameters for the purpose of enhancing the inherent safety performance of SFR. In order to prevent the safety barrier rupture for ULOF events the set of thermal hydraulic criteria defining the ULOF transient processes dynamics and requirements to these criteria were recommended based on achieved results: primary sodium flow dip under the natural circulation asymptotic level and natural circulation rise time.
- ПубликацияТолько метаданныеDetermination of integral turbulence model parameters as applied to the calculation of flows in fuel assemblies of fast reactors in porous-body approximation(2020) Vlasov, M. N.; Korsun, A. S.; Maslov, Yu. A.; Merinov, I. G.; Kharitonov, V. S.; Корсун, Александр Сергеевич; Маслов, Юрий Александрович; Меринов, Игорь Геннадьевич; Харитонов, Владимир Степанович© Published under licence by IOP Publishing Ltd.This work aimed to correct the integral turbulence model developed earlier for assemblies of smooth rods. Two variants of the fuel assembly design were considered. In the first variant, the fuel rods were spaced using spacer grids. The presence of a spacer grid does not require a change in the form of the system of equations but leads to a change in the form of the resistance tensor and the generation of turbulence in the spacer grid region. In the second variant, a wire-wrapped fuel bundle was analyzed. The presence of a wire-wrapped fuel bundle requires an additional term in the equation for the conservation of momentum and change in the form of the resistance tensor. The simulations were obtained by CFD code ANSYS CFX and aimed at the determination of parameters involved in an integral model of turbulence being developed for modeling nuclear-reactor cores and heat exchangers in anisotropic porous-body approximation.
- ПубликацияТолько метаданныеMethod for calculating the coefficient of hydraulic resistance of a coaxial heat exchanger with rough walls(2022) Struchalin, P. G.; Pisarevsky, M. I.; Korsun, A. S.; Fedoseev, V. N.; Корсун, Александр Сергеевич; Федосеев, Вячеслав Николаевич© 2022 Elsevier LtdA method for calculating the coefficient of hydraulic resistance of a coaxial heat exchanger with different roughness of opposite walls is proposed. According to the technique, the annular section of the heat exchanger channel is divided by a line of zero shear stress into two non-interacting annular layers. The balance equations in the layers and the channel together with the condition of matching the velocities of the layers on the zero shear stresses line form a closed system of equations. The solution of the system allows calculating the coefficient of hydraulic resistance of the channel as a whole, the position of the line of zero shear stresses, average velocities in each of the layers, the value of the second constant of the universal velocity profile. The method was verified in several ways, which showed the maximum deviation of the calculated values from the data of other authors and the results of our experiments, no more than 7%. In our experiments, we used three two-dimensional artificial roughness profiles: rectangular, trapezoidal, and triangular.
- ПубликацияТолько метаданныеStudying the effective longitudinal turbulent transfer at transverse streamlining of in-line tube bundles(2019) Rachkov, V. I.; Fedoseev, V. N.; Pisarevsky, M. I.; Korsun, A. S.; Merinov, I. G.; Balberkina, Y. N.; Рачков, Валерий Иванович; Федосеев, Вячеслав Николаевич; Корсун, Александр Сергеевич; Меринов, Игорь Геннадьевич© 2019, V.I. Rachkov, V.N. Fedoseev, M.I. Pisarevskiy, A.S. Korsun, I.G. Merinov, and Yu.N. Balberkina.The experimental values of the effective thermal conductivity of water at transverse streamlining of the in-line rod bundles with square packing have been obtained. The effective thermal conductivity of water was measured in the direction parallel to the axes of the rods. The measurement method implied mixing of two flat parallel water flows in the working area; the latter moved at the same velocities, but had different temperatures. By measuring the flow temperatures before and after the mixing area, the amount of heat transferred from the hot to the cold flow was determined and the effective thermal conductivity of the liquid was calculated. In the investigated range of Reynolds numbers (from 7·103 to 8·104), calculated by the velocity in a narrow section, the experimental effective thermal conductivity of water showed a linear increase with increasing velocity and good agreement with the results of calculations by the integral turbulence model. The obtained experimental data have confirmed the possibility of using an integral turbulence model to calculate the parameters of the anisotropic porous solid model, used in CFD codes simulating thermal-hydraulic processes in the active zones of nuclear reactors and heat exchangers.
- ПубликацияТолько метаданныеAnnular Layer as a Generalized One-Dimensional Channel(2021) Korsun, A. S.; Fedoseev, V. N.; Pisarevskiy, M. I.; Pisarevskaya, Y. N.; Medgedem, S.; Корсун, Александр Сергеевич; Федосеев, Вячеслав Николаевич; Писаревская, Юлия Николаевна© 2021, Pleiades Publishing, Ltd.Abstract: In this paper, the concept of a new generalized one-dimensional channel—an annular layer—is introduced. It includes a solid cylindrical wall and a liquid or gas layer adjacent to the wall, on the outer surface of which there is no momentum flux and the maximum velocity is reached. By definition, there are two annular layers: outer and inner. For each layer, formulas for calculating their geometric characteristics are presented: area, wetted perimeter, hydraulic diameter, and layer curvature. Depending on the curvature of the annular layer β, the channel can turn into a flat layer, a circular pipe, or an equivalent cell of rod bundles with a different relative spacing. The velocity distribution for a turbulent coolant flow in an annular channel is described by a universal velocity profile. With its help, relations are obtained to determine the maximum-to-average velocity ratio, the deviation of the maximum velocity from the average, and the hydraulic resistance coefficient of the channel versus its curvature. Depending on the curvature parameter β, they generalize the data on the turbulent flow of a liquid or gas in a flat channel, round pipe, annular channel, and rod bundles with a smooth and rough channel surface. It is indicated that, for a given shape and geometry of the roughness, it is necessary to know the dependence of the second constant of the logarithmic profile on the dimensionless height. The calculation formulas obtained can be used in engineering calculations of the hydraulics of heat exchange equipment for the needs of nuclear power.
- ПубликацияОткрытый доступПРОГРАММА ТРЕТОН(НИЯУ МИФИ, 2024) Меринов, И. Г.; Корсун, А. С.; Маслов, Ю. А.; Корсун, Александр Сергеевич; Меринов, Игорь Геннадьевич; Маслов, Юрий АлександровичПрограмма предназначена для численного моделирования трехмерных теплогидравлических процессов в активных зонах и тепловыделяющих сборках быстрых реакторов с жидко-металлическим теплоносителем в режимах нормальной эксплуатации и нарушений нормальной эксплуатации. В программе процессы тепломассопереноса моделируются в приближении анизотропного пористого тела, которое специально разработано для описания стержневых структур. Программа реализована в рамках программы "Приоритет-2030", подпроект С2-02 проекта С2-00 работы. Тип ЭВМ: IBM РС-совмест. ПК; ОС: Windows 7 и выше.
- ПубликацияОткрытый доступHydraulic resistance of an annular channel with a rectangular roughness on the wall(2020) Medgedem, S.; Korsun, A. S.; Fedoseev, V. N.; Pisarevskii, M. I.; Pisarevskaya, Y. N.; Корсун, Александр Сергеевич; Федосеев, Вячеслав Николаевич; Писаревская, Юлия Николаевна© Published under licence by IOP Publishing Ltd.This paper provides a brief overview of approaches to calculating the hydraulic resistance coefficient of a channel with rough walls and describes their advantages and disadvantages. One of the most popular engineering approaches is based on integral characteristics. By the influence of roughness, the logarithmic velocity profile changes, which is fully described by the second constant. It determines the interaction of a turbulent flow with a rough wall. Its numerical value depends on a large number of factors, such as geometry of the roughness protrusion, the dimensionless height of the protrusion, its shape, angle of attack, and so on. Getting a generalized dependence of this kind is an actual task of rough channel hydraulics. In this paper, the second constant of the logarithmic velocity profile is numerically calculated using turbulence models. A symmetric model of a developed turbulent flow in an annular channel with a rectangular roughness on the wall is implemented. Roughness was applied to the surface of the rod, the inner surface of the pipe was smooth. The result of numerical simulation was the obtained velocity profile, which was used to determine the numerical value of the second constant. The obtained results are satisfactory agreement with the experimental data.