Персона: Боговалов, Сергей Владимирович
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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- ПубликацияОткрытый доступВолны в сверхсильных центробежных полях(2023) Боговалов, С. В.; Джуля, Д. Н.; Кислов, В. А.; Тронин, И. В.; Кислов, Владимир Александрович; Джуля, Денис Николаевич; Боговалов, Сергей Владимирович; Тронин, Иван ВладимировичВ докладе представлены исследования волновых процессов в газе в сверхсильных центробежных полях, достигающих 10 6 g . Такие условия реализуются в газовых центрифугах для разделения изотопов. Получен полный спектр волн, состоящий из пяти мод. Обсуждаются связь этих волн с внутренними волнами в гравитационном поле. Есть общие черты и существенные различия. Особый интерес представляют обнаруженные нами чисто акустические волны, продольно поляризованные и распространяющиеся строго вдоль оси вращения во всем диапазоне частот. Плотность энергии этих волн концентрируется вблизи стенок ротора. Эти волны имеют наименьшее затухание по сравнению со всеми остальными типами волн. Даются оценки декремента затухания этих волн. Обсуждается возможное влияние этих волн на динамику газа и на процесс разделения бинарных смесей изотопов в газовых центрифугах.
- ПубликацияТолько метаданныеВОЛНЫ В ГАЗОВЫХ ЦЕНТРИФУГАХ(2025) Боговалов, С. В.; Джуля, Д. Н.; Кислов, В. А.; Тронин, И. В.; Тронин, Иван Владимирович; Кислов, Владимир Александрович; Боговалов, Сергей Владимирович; Джуля, Денис НиколаевичWaves in gas centrifuges for separation of isotopes are generated naturally by scoops. We provide an overview of the main results of the study of these waves′ physics and their in uence on the processes of separation of binary mixtures in gas centrifuges. Волны в газовых центрифугах для разделения изотопов генерируются естественным образом газоотборниками. Мы даем обзор основных результатов по изучению физики этих волн и влияния их на процессы разделения бинарных смесей в газовых центрифугах.
- ПубликацияОткрытый доступАНАЛИТИЧЕСКАЯ ОЦЕНКА РАЗДЕЛЕНИЯ ИЗОТОПОВ ВОЛНАМИ В СВЕРХСИЛЬНЫХ ЦЕНТРОБЕЖНЫХ ПОЛЯХ(НИЯУ МИФИ, 2026) ДЖУЛЯ, Д. Н.; БОГОВАЛОВ, С. В.; ТРОНИН, И. В.; Боговалов, Сергей Владимирович; Тронин, Иван Владимирович; Джуля, Денис НиколаевичРазделение волнами в газовых центрифугах (ГЦ) происходит за счёт двух основных механизмов - бародиффузии и радиальных колебаний газа в волне [1]. Сделана аналитическая оценка разделения изотопной смеси UF6 в ГЦ за счёт обоих механизмов в безотборном режиме ГЦ для различных скоростей вращения ГЦ и частоты волны.
- ПубликацияОткрытый доступPhysics of "cold" disk accretion onto black holes driven by magnetized winds(2019) Bogovalov, S.; Боговалов, Сергей Владимирович© 2019 by the authors. Disk accretion onto black holes is accompanied by collimated outflows (jets). In active galactic nuclei (AGN), the kinetic energy flux of the jet (jet power or kinetic luminosity) may exceed the bolometric luminosity of the disk by a few orders of magnitude. This may be explained in the framework of the so called "cold" disk accretion. In this regime of accretion, the disk is radiatively inefficient because practically all the energy released at the accretion is carried out by the magnetized wind. This wind also provides efficient loss of the angular momentum by the matter in the disk. In this review, the physics of the accretion driven by the wind is considered from first principles. It is shown that the magnetized wind can efficiently carry out angular momentum and energy of the matter of the disk. The conditions when this process dominates conventional loss of the angular momentum due to turbulent viscosity are discussed. The "cold" accretion occurs when the viscous stresses in the disk can be neglected in comparison with impact of the wind on the accretion. Two problems crucial for survival of the model of "cold" accretion are considered. The first one is existence of the magnetohydrodynamical solutions for disk accretion purely due to the angular momentum loss by the wind. Another problem is the ability of the model to reproduce observations which demonstrate existence of the sources with kinetic power of jets 2-3 orders of magnitude exceeding the bolometric luminosity of disks. The solutions of the problem in similar prescriptions and numerical solutions without such an assumption are discussed. Calculations of the "unavoidable" radiation from the "cold" disk and the ratio of the jet power of the SMBH to the bolometric luminosity of the accretion disk around a super massive black hole are given in the framework of the Shakura and Sunyaev paradigm of an optically thick a-disk. The exploration of the Fundamental Plane of Black Holes allows us to obtain semi empirical equations that determine the bolometric luminosity and the ratio of the luminosities as functions of the black hole mass and accretion rate.
- ПубликацияТолько метаданные3-D Numerical Modeling of MHD Flows in an Aluminum Reduction Cell(2019) Pianykh, A. A.; Tkacheva, O. Y.; Radzyuk, A. Y.; Bogovalov, S. V.; Tronin, I. V.; Боговалов, Сергей Владимирович; Тронин, Иван Владимирович© 2019 IOP Publishing Ltd. All rights reserved.Three-dimensional numerical modeling of processes in an aluminum electrolytic cell at a current of 9 kA is performed. The model considers the nonlinear temperature dependence of all physical characteristics of materials. The specificity of the work is the inclusion in the model of the dynamics of the gas formed during the operation of the cell. The bubble motion, magnetic forces and heat convection essentially affect the overall dynamics of the electrolyte and metal. Calculations were carried out using the commercial software packages ANSYS CFX 18.2 and ANSYS Maxwell united with the aid of the user FORTRAN program.
- ПубликацияТолько метаданныеRatio of the jet power to the bolometric luminosity of the disk during accretion onto a black hole(2019) Bogovalov, S. V.; Боговалов, Сергей Владимирович© 2019 World Scientific Publishing Company. Disk accretion onto black holes is accompanied by collimated outflows (jets). In active galactic nuclei (AGN), the kinetic energy flux of the jet (jet power or kinetic luminosity) may exceed the bolometric luminosity of the disk by a few orders of magnitude. This may be explained in the framework of the so-called "cold" disk accretion when the only source of the AGN energy is the energy released by accretion. The radiation from the disk is suppressed because the disk wind carries out almost all the angular momentum and the gravitational energy of the accreting material. In this paper, we calculate the "unavoidable" radiation from the "cold" disk and the ratio of the kinetic energy power of the outflow to the bolometric luminosity of the accretion disk around a super massive black hole in the framework of the Shakura and Sunyaev paradigm of an optically thick α-disk. The exploration of the Fundamental Plane of Black Holes allows us to obtain equations that define the bolometric luminosity and the ratio of the luminosities as functions of the black hole mass and accretion rate. The application of our equations in the case of the M87 jet demonstrates good agreement with observations. In the case of Sgr A∗, these equations allow us to predict the kinetic energy flux from the disk around the Galactic supermassive black hole.
- ПубликацияТолько метаданныеRatio of kinetic-to-bolometric luminosity at the "cold" disk accretion onto black holes(2020) Bogovalov, S.; Боговалов, Сергей Владимирович© International Astronomical Union 2020.In galactic nuclei (AGN), the kinetic energy flux of the jet may exceed the bolometric luminosity of the disk a few orders of magnitude. At the "cold" accretion the radiation from the disk is suppressed because the wind from the disk carries out almost all the angular momentum and the gravitational energy of the accreted material. We calculate an unavoidable radiation from such a disk and the ratio of the kinetic-to-bolometric luminosity from a super massive black hole in framework of the paradigm of the optically thick α-disk of Shakura & Sunyaev. The results confirm that the gravitational energy of the accreted material can be the only source of energy in AGNs.
- ПубликацияТолько метаданныеPreface(2022) Bogovalov, S. V.; Боговалов, Сергей Владимирович
- ПубликацияТолько метаданныеWaves in strong centrifugal field: dissipative gas(2019) Bogovalov, S. V.; Kislov, V. A.; Tronin, I. V.; Боговалов, Сергей Владимирович; Кислов, Владимир Александрович; Тронин, Иван ВладимировичIn the fast rotating gas (with the velocity typical for Iguassu gas centrifuge), three families of linear waves exist with different polarizations and law of dispersion. The energy of the waves is basically concentrated at the axis of rotation in the rarefied region. Therefore, these waves decay on the distance comparable with the wavelength. There is only one type of waves propagating strictly along the axis of rotation with the law of dispersion similar to ordinary acoustic waves. These waves are interested for the physics of gas centrifuges. The energy density of these waves concentrates at the wall of the rotor. These waves have weak damping due to the molecular viscosity and heat conductivity. The damping coefficient is determined for this type of waves by numerical calculations. Analytical approximations for the damping coefficient are defined as well. At the parameters typical for the Iguassu centrifuge, the damping is defined by interaction of the waves with the rotor wall.
- ПубликацияТолько метаданныеOptimal working regimes of the hyper-speed long Iguasu gas centrifuge(2020) Bogovalov, S. V.; Borman, V. D.; Vasilyev, A. V.; Tronin, I. V.; Tronin, V. N.; Боговалов, Сергей Владимирович; Васильев, Александр Владиславович; Тронин, Иван Владимирович© 2020 Published under licence by IOP Publishing Ltd.Rapid development of technologies for production of new materials may provide design of gas centrifuges (hereafter GC) with rotor speed above 1000 m/s. The question about efficiency of such GCs remains open. At present no experimental or theoretical studies regarding the separation effciency of such GCs exist. We present the results of calculations of the optimized separative power of the hyper-speed Iguassu GCs with a length of 1 to 5 meters and rotational speeds from 1000 to 1500 m/s. The calculations were performed in axisymmetric approximation in frameworks of the source-sink model. It is shown that for the hyper-speed GCs the optimized separative power, pressure at the rotor wall, feed flux and gas friction power linearly grow with the rotor length, while the temperature drop along the rotor does not depend on the rotor length.