Vladimir Krupkin

Vladimir Krupkin
Semenov Institute of Chemical Physics · Department of Combustion and Explosion

Doctor of Philosophy

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56
Publications
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Citations
Introduction
Skills and Expertise

Publications

Publications (56)
Article
При повышенных давлениях до 1000 атм с помощью термопарной методики (вольфрам-рениевые П-образные термопары толщиной 3 мкм) проведено исследование тепловой структуры волны горения нитроглицеринового пороха Н. Эксперименты проводились в двухкамерной установке, представляющей собой основную реактивную камеру сгорания объемом 330 см3, оборудованную см...
Article
Проведено исследование особенностей горения на воздухе цилиндрических образцов из порошка магния насыпной плотности с различными добавками - безводной сернокислой медью, оксидом железа и кристаллогидратами CuSO4 * 5H2O, FeSO4 * I0H2O и Na2В4O7 * I0H2O. Показано, что введение в состав порошка магния добавки в количестве более 2%(вес.) приводит к реж...
Article
Впервые экспериментально исследована зависимость скорости горения гомогенного конденсированного энергетического материала (ГКЭМ) от кривизны поверхности горения. Для этого использовались заряды баллиститного двухосновного твердого топлива с искусственно искривленной поверхностью горения: двухщелевые заряды и заряды в виде тонких клиновидных пластин...
Article
Продемонстрирована возможность создания на основе термоэлектрических модулей импульсных генераторов электричества закрытого типа, в которых химическая энергия при горении порошков металла на воздухе преобразуется в электричество. В отличие от генераторов открытого типа с протоком горячей среды в рассмотренном случае практически вся химическая энерг...
Article
The dependence of the burning rate of a solid homogeneous energetic material on curvature of the burning surface is investigated theoretically and experimentally. For these purposes, we use wedge-shaped samples with different apex angles which allow realizing the curved burning surface with a controlled curvature. In order to stabilize combustion a...
Article
Рассматривается задача об организации устойчивого диффузионного горения порошка металла в атмосфере азота при давлениях до 100 атм путем использования промотирующей добавки. Показано, что при давлении выше некоторого критического возможно устойчивое горение порошка магния с размером частиц около 80 мкм при введении в него промотора в виде порошка н...
Article
The dependence of the burning rate of a solid homogeneous energetic material on curvature of the burning surface is investigated experimentally for the first time. For this purpose we use a double-slit propellant grain which allows realizing the curved burning surface with a controlled curvature. We compare the experimental data with theoretical de...
Article
Full-text available
The combustion regimes were studied and the oxygen index for the bulk-density magnesium powder with a particle size of ~80 μm placed in a paper cup was determined in nitrogen–oxygen and argon–oxygen mixtures at pressures from 0.3 to 1 atm. It was shown that at a constant pressure of the mixture, there was a minimum concentration of oxygen at which...
Article
Full-text available
We study experimentally the combustion of a double-based solid propellant NB at a pressure of p = 1 bar, and show that combustion occurs in the cellular-oscillating mode: combustion occurs in the form of separate cells that periodically appear on the burning surface, move along it and disappear. We show that in this mode, a carbonized skeleton is f...
Article
GORENIE I VZRYV (MOSKVA) — COMBUSTION AND EXPLOSION 2019 volume 12 number 2 85-91 ULTIMATE CONDITIONS OF BURNING THE MAGNESIUM POWDER IN NITROGEN–OXYGEN MIXTURE V. M. Shmelev, V. G. Krupkin, V. M. Nikolaev, and S. V. Finyakov N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygin Str., Moscow 119991, Russian Federation...
Article
Combustion modes with a subsurface maximum temperature may occur in the burning of homogeneous energetic materials, such as solid propellants and explosives. In this paper, we analyzed the stability of a stationary combustion wave with a temperature maximum in the condensed phase. We showed that the boundary of stability corresponds to the merging...
Article
Full-text available
The problem of the effect of the geometry of a sample on the critical conditions for thermal explosion in an arbitrarily shaped solid with a constant surface temperature has been studied. The geometrical factors affecting the location of the hot spot and the critical conditions have been analyzed. It has been shown that the location of the hot spot...
Article
A mathematical model of the propagation of the front of decomposition of active fire-retardant intumescent paints in pulsed mode is developed. A hypothesis explaining the mechanism of the experimen-tally observed pulsed modes of decomposition front propagation by the existence of an exothermic step in the decomposition reaction, leading to the self...
Article
Ignition and burning of a composite solid propellant (CSP) irradiated with an IR CO-laser at a subatmospheric pressure are studied to ascertain the nature and mechanism of combustion and to model the burning process in space. Five regimes of CSP burning under the conditions considered are analyzed: at low values of the surface radiation flux J ther...
Article
An alternative, nonelectrical method for obtaining a dense radiating plasma and the possibilities of using this method to pump solid-state lasers are investigated. The plasma was obtained experimentally by heating the working gas in a two-stage ballistic plasmatron. A new device — a vortex chamber — is proposed for transferring energy into the plas...
Article
An alternative, nonelectric method of preparing a dense radiating plasma is investigated, and the possibility is studied of using this method for pumping solid-state lasers. The plasma is generated by heating a working gas in a two-stage ballistic plasma generator. A novel device, namely, a vortex chamber, is suggested for transmitting energy in th...
Article
Possible operating regimes of ballistic plasma guns are investigated. The optimization of the parameters and operating regimes of these installations allowed substantially (by a factor of 10-20) enhancing their energy capacity. The energy characteristics attained, as well as the independence and high coefficient of conversion of the energy of prope...
Article
Based on theoretical analysis and numerical investigation into radiative cooling of optically thick plasma in a chamber with radiation-absorbing walls it is shown that the dynamics of radiative cooling depends on two processes - on propagation of a radiative cooling wave and on propagation of acoustic waves generated by the radiative cooling wave t...
Article
Operation of a radiative burner with a catalytic matrix is studied. The range of conditions and operation is determined. A two-layer ceramic matrix with a catalytic top layer is shown to be a promising practical device. A mathematical model of a burner based on this device is constructed using the equations of mass and energy balance and chemical k...
Article
A one-dimensional problem of local ignition of a propellant or solid fuel is formulated and solved for spherical geometry. The high symmetry of the problem and the use of asymptotic behavior of the solution at short and long ignition times enabled expressions for the criterion, temperature, and time of ignition valid within a wide range of the inte...
Article
We have carried out a numerical analysis of the ignition by a constant heat flux of a wedge and cone of finite length with a base maintained at a constant temperature. We have determined the critical condition under which the existence of steady temperature distribution through the body in various heating regimes is impossible.
Article
The authors comparatively test the following polymer fibers for their combustion and flame resistant properties: unmodified viscose fiber; viscose fiber modified with a salt of polyethylene-polyamine; viscose fiber modified with diamidomethylphosphate and urea; copolymer fibers Verel and Canekalon; polyacrylonitrile fiber; polyvinylchloride fiber;...
Article
Because of the fact that dissociation is significant for oxygen and oxygen-enriched mixtures, in this work the theory of limits is developed taking into account dissociation, and a constant critical Peclet number becomes a function of the energy and degree of dissociation. The authors found it useful to study simplified models which describe the li...
Article
Samples of single-layer thickness and others composed of several sheets of paper were investigated. In the latter case the paper was stacked and then clamped between frames. The reproducibility of the results on the combustion of samples made of one or several sheets of paper was 3% for the velocity and 5% for the limiting size for combustion.
Article
Oxygen index and flame travel distance (FTD) till self-extinguishing of a vertically mounted specimen (a calendered mat) were measured for rayon, rayon fireproofed with polyethylenepolyamine, rayon fireproofed with diamidomethyl phosphate in the presence of urea, acrylonitrile/vinyl chloride copolymer fibres, acrylic fibres, polyvinyl chloride fibr...