Acceleration of solid particles by gaseous detonation products

Gavrilenko, T. P.; Grigoriev, V.V.; Ждан, С. А.; Nikolaev, Yu. A.; Boiko, V. M.; Papyrin, A. N.

doi:10.1016/0010-2180(86)90084-2

Combustion and Flame

1986

DOI: 10.1016/0010-2180(86)90084-2

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Acceleration of solid particles by gaseous detonation products

T. P. Gavrilenko

V.V. Grigoriev

С. А. Ждан

et al.

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Cited by 22 publications

(2 citation statements)

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“…This model is of high accuracy and is consistent with the second law of thermodynamics, as has been shown in [20]. The model has successfully been used in numerous scientific and engineering calculations of combustion and detonation processes, e.g., to model DWs in gas [22], dropping-gas [23], and bubble systems [24], and pulsating detonation engines [25], and also in designing production units for gaseous-detonation deposition of powder coatings [26].…”

mentioning

confidence: 87%

Parameters, limits, attenuation, and suppression of detonation in mixtures of an explosive gas with chemically inert microparticles

Федоров

Fomin

Тропин

et al. 2012

J Eng Phys Thermophy

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UDC 534.222Chapman-Jouguet parameters and the cell size of a detonation wave in mixtures of an explosive gas with chemically inert particles have been calculated. The algorithm of calculation of the minimum mass and characteristic dimension of a particle cloud ensuring successful suppression of detonation in the gas has been proposed. The calculation results are in good agreement with the available experimental data. The influence of the initial composition of the gas on the efficiency of suppression of the detonation wave has been analyzed. The issue of the dependence of the concentration limits of detonation on the mass fraction of particles has been investigated. It has been established that the increase in the concentration of the condensed phase leads to a narrowing of the existence domain of detonation and that the propagation of the detonation wave becomes impossible when the concentration of the particles is fairly high.Introduction. Injection of chemically inert particles is an efficient method of control of detonation processes in gaseous mixtures. The theory of propagation and suppression of a detonation wave (DW) in gases with chemically inert particles is far from completion. It is only the influence of the size, density, and concentration of the particles of the wave parameters that has theoretically been investigated until recently [1][2][3][4][5][6][7][8][9][10][11][12]. Theoretical modeling was mainly one-dimensional. Two-dimensional modeling of detonation in mixtures of a gas with particles has been carried out in [9,11,12]. According to the results of theoretical investigations, an increase in the concentration of the condensed phase and a decrease in the particle size and the density of the particle material improve the efficiency of suppression of the wave by chemically inert particles. These results correlate with available experimental data.At the same time, the minimum total mass of the condensed phase and the spatial length of a particle cloud, which cause wave suppression, have not been calculated, except for [13]. The influence of the mixture's thermodynamic parameters (in particular, heat capacity, temperature, and melting heat) has not been analyzed. The issue of the criterion of successful suppression of a DW in reactive gases with particles remained open, too.In [14], we proposed an algorithm for the calculation of the parameters of a Chapman-Jouguet wave in mixtures of a gas with chemically inert microparticles and the method of evaluation of the relative size of a detonation cell. By analogy with gaseous detonation, we proposed the criterion (based on a comparison of the channel diameter and the cell size) for the limit of multifront detonation in such heterogeneous media. We calculated the minimum mass of the particles and the characteristic dimension of the cloud that are necessary for suppressing detonation. We were the first to analyze the influence of the thermodynamic parameters of the particles on the process of detonation suppression. Calculations of the DW velocity as a f...

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mentioning

confidence: 87%

Parameters, limits, attenuation, and suppression of detonation in mixtures of an explosive gas with chemically inert microparticles

Федоров

Fomin

Тропин

et al. 2012

J Eng Phys Thermophy

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“…We developed a numerical model of the process, which substantially simplifies the analysis of the phenomenon. The mathematical formulation of the problem is similar to that described in [2], except that the barrel is filled by an explosive gas mixture with the composition varied in the axial direction. Therefore, we introduced the Lagrangian coordinates and refined the model of the kinetics of chemical reactions and the caloric equation of state [3].…”

mentioning

confidence: 99%

Limits of gaseous detonation spraying

Gavrilenko

Nikolaev

2006

Combust Explos Shock Waves

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The maximum possible values of adhesion and cohesion are calculated for a number of powder materials, substrate materials, sizes of installation barrels, and compositions of explosive gas mixtures. These data give a clear idea about the areas of applicability of gaseous detonation spraying.The process of gaseous detonation spraying implies that an explosive mixture is injected through a gas mixer into a tube (barrel) closed on one end, a portion of the powder is fed into the barrel, and then detonation is initiated near the closed end of the barrel. The flow of detonation products expanding from the barrel accelerates and heats the powder particles. Leaving the barrel, the powder particles hit a target (substrate) and form a coating. The general concept of the current status of this technology can be found in the review [1].The main advantage of gaseous detonation spraying is the possibility of obtaining coatings from a wide range of powder materials (metals, alloys, carbides, oxides, and composites), the absence of porosity (less that 1%) in coatings, and significantly higher adhesion and cohesion as compared with coatings obtained by other methods. Owing to the pulse character of spraying, there are no problems with cooling of the barrel and with cooling, warping, or thermal damages of treated parts.In all gas-thermal methods of spraying, coating formation is determined by diffusion processes where the main role belongs to particle velocity and temperature, which energetically complement each other. A detonation coating is formed by elementary acts of interaction of high-velocity melted or partly melted particles with a cold surface of the substrate.The pressure behind the detonation-wave front reaches tens of atmospheres, and the temperature can be as high as several thousand degrees, which allows accelerating powder particles up to several hundred meters per seconds and heating the particles up to the melting point and above.A melted or partly melted particle moving with a velocity greater than 100 m/sec spreads over the substrate surface and forms a cumulative jet, which cleans the substrate surface and ensures good contact (at a molecular level) between the particle and the substrate. A certain part of the substrate surface experiences microscopic plastic deformation upon the impact. Adhesion and cohesion depend on the relative area of the contact surface where interdiffusion occurs to a depth of several interatomic distances during particle cooling on the substrate surface.Ledges of the substrate-surface roughness are under privileged conditions, because they are surrounded by the hot particles to a greater extent and, therefore, are heated to a higher temperature.Particles that are not melted at all do not usually form a coating. Particle overheating has also an adverse effect. Completely melted particles can splash at the impact onto the substrate or spread widely over the substrate surface, which is hazardous from the viewpoint of crack formation in the coating. Being accelerated, melted particles can b...

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Use of a nozzle in particle acceleration by a flow of gas detonation products in tubes

Григорьев

1996

Combust Explos Shock Waves

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Acceleration of solid particles by gaseous detonation products

Cited by 22 publications

References 1 publication

Parameters, limits, attenuation, and suppression of detonation in mixtures of an explosive gas with chemically inert microparticles

Parameters, limits, attenuation, and suppression of detonation in mixtures of an explosive gas with chemically inert microparticles

Limits of gaseous detonation spraying

Use of a nozzle in particle acceleration by a flow of gas detonation products in tubes

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