Combustion-wave propagation through an inert obstacle in real condensed systems

Proskudin, V. F.; Голубев, В. А.; Berezhko, P. G.; Boitsov, I. E.; Belyaev, E. N.; Funin, V. N.; Kremzukov, I. K.; Malyshev, A. Ya.

doi:10.1007/bf02672696

Combust Explos Shock Waves

1998

DOI: 10.1007/bf02672696

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Combustion-wave propagation through an inert obstacle in real condensed systems

V. F. Proskudin

В. А. Голубев

P. G. Berezhko

et al.

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Cited by 7 publications

(3 citation statements)

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“…Indirect evidence of this is that the true burning rate in the range of relative elongations of ≈30-115% also remains nearly unchanged. The large values of the delay of combustion transfer [9], related to the displacement of the material in the burning Ti + C + 20% TiC mixture before an obstacle (which were detected earlier in [9]), are likely due not to a decrease in the density of the loose layer but they are due to the presence of transverse layering (gaps) in this layer, resulting in a sharp decrease in the effective thermal conductivity in this zone. To eliminate the effect of such gaps (transverse cracks) on specimen combustion and combustion transfer through an obstacle by ensuring conductive contact of the layering slags in the burning specimen, it is sufficient to apply a small axial load of about 0.1-1 kg/cm 2 to a free burning specimen, as was recommended, for example, in [23].…”

mentioning

confidence: 93%

“…Furthermore, material displacement can be observed both at the combustion front and behind and ahead of the front [6][7][8][9][10].…”

mentioning

confidence: 99%

“…parameters, in particular, burning rate [2][3][4] but also the parameters of combustion transfer through an obstacle [7,9,10], which should be taken into account in experiments. In addition, deformation of burning specimens is allowed for in computational and theoretical papers devoted to the combustion of heterogeneous systems [11][12][13][14][15][16].…”

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confidence: 99%

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Combustion of pressed specimens of heterogeneous systems subjected to a constant axial mechanical load

Proskudin

Belyaev

2007

Combust Explos Shock Waves

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The growth dynamics of the height of burning pressed specimens with the specimen ends subjected to a compressive force of constant magnitude is studied using the heterogeneous Ti + C + 20% TiC system as an example. It is found that in the examined range of compressive forces 0.1-2 kg/cm 2 , the growth of the height of the burning specimens with time obeys a linear law; under a compressive force of ≈0.1 kg/cm 2 , the specimen height increases by ≈100%, and under a force of ≈2 kg/cm 2 , it increases by about 25%. The method used to measure the growth dynamics of the specimen height during combustion proved a useful tool for the experimental determination of both the burning time of the specimens and the delay in the transfer of combustion through an obstacle.Key words: combustion, elongation of specimens, burning rate, transfer of combustion through an obstacle.It is known that solid-flame combustion is frequently accompanied by the displacement of the material in the burning specimen. In the absence of a rigid shell, the variation in the specimen dimensions during combustion can be referred to one of the two types (type II or type III) described in [1]. For type II, the shape of the burning specimen is preserved as its dimensions, in particular, length, vary significantly while the diameter does not change (the displacement of material of type II was for the first time observed in studies of the combustion of the Ti + 2B system [2][3][4]). Type III is characterized by changes in both shape and dimensions of the burning specimen.During combustion of specimens in a rigid halfclosed shell, a situation can arise where the dimensions and shape of the burning specimens do not vary (type I [1]) and displacement of the material occurs only within the burning specimen [5]. Furthermore, material displacement can be observed both at the combustion front and behind and ahead of the front [6-10].The displacement (deformation) of the material in a burning specimen changes not only the combustion parameters, in particular, burning rate [2-4] but also the parameters of combustion transfer through an obstacle [7,9,10], which should be taken into account in experiments. In addition, deformation of burning specimens is allowed for in computational and theoretical papers devoted to the combustion of heterogeneous systems [11][12][13][14][15][16].The material displacement dynamics during combustion is conveniently studied using flash radiography [7,8] for specimens in a rigid shell and by measuring the specimen height change Δl in time with a mechanical sensor for unconfined specimens. The latter method was used in the present study. A heterogeneous Ti + C + 20% TiC mixture prepared in a ball mill was used [6]. This mixture was pressed into specimens of diameter 8 mm and height l equal to 4 or 7 mm using the procedure described in [17], which involves the formation of a paper ("blue ribbon" decalcified filter paper) shell on the cylindrical surface of the specimens. The ends of the specimens remained opened. The specimens were pressed...

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mentioning

confidence: 93%

“…Furthermore, material displacement can be observed both at the combustion front and behind and ahead of the front [6][7][8][9][10].…”

mentioning

confidence: 99%

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Combustion of pressed specimens of heterogeneous systems subjected to a constant axial mechanical load

Proskudin

Belyaev

2007

Combust Explos Shock Waves

Self Cite

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Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

Shekhawat,

Breiter,

Döll

et al. 2024

Adv Eng Mater

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System engineering requires the implementation of assembly methods allowing the formation of functional elements according to a desired system design. This is possible by joining prefabricated elements on a desired place in the system or by forming functional materials at wanted locations. Both approaches need temperature treatment. A typical system in part consists of materials restricting the use of annealing procedures above 300 °C. For this reason, higher‐temperature operations have to be localized to the point of use and transferred to the next reactive element. A further requirement is the reduction of the thermal budget of the localized joining process implementing ultrashort heat treatment operations. Reactive metallic multilayer offers the combined possibility of implementing a localized heat source and the formation of a functional intermetallic alloy. The article demonstrates the feasibility of a heat and reaction transfer chain in a topological structured pattern consisting of localized reactive multilayer materials under conditions of their gasless combustion. For the used Ni/Al multilayer material system, the critical (obstacle thickness) dimensions for the reaction and heat transfer are determined using a high‐speed camera and pyrometer measurements.

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Proskudin

2001

Combustion, Explosion, and Shock Waves

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Combustion-wave propagation through an inert obstacle in real condensed systems

Cited by 7 publications

References 1 publication

Combustion of pressed specimens of heterogeneous systems subjected to a constant axial mechanical load

Combustion of pressed specimens of heterogeneous systems subjected to a constant axial mechanical load

Transfer of Self‐Sustained Reactions between Thermally Coupled Reactive Material Elements

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