Combustion and extinction of a ballistite propellant at critical diameter

Зенин, А. А.; Leĭpunskiĭ, O. I.; Piskovskii, S. V.; Пучков, В. М.

doi:10.1007/bf00744878

Cited by 5 publications

(14 citation statements)

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“…1. By the burning rate (unless otherwise specified) is understood the so- Critical diameter versus burning rate for powder N: 1) data of [6]; 2) data of Bespalov (cited from [2]) and [5]; 3) data of Bespalov (cited from [2]) for powder samples in cellophane coated with polyvinyl chloride lacquer in casings placed in water; 4) data for powder samples in a metal casing [7]; 5) dependence D1cr = 3.6u −1.15 obtained by processing data (see points 8) for film-reinforced powder samples placed in water [4]; 6) dependence D2cr = 3.15u −1.15 obtained by processing data for film-reinforced powder samples burned in nitrogen [4]; 7) dependence D3cr = 1.77u −1.15 cr for the same samples [4].…”

Section: Resultsmentioning

confidence: 99%

“…Thus, studies [2,6] were performed using the following experimental procedure proposed in [5]: a cylindrical or conical sample was enclosed in a shell of three cellophane layers glued by BF-6 butvar-phenolic adhesive and coated outside and inside with vinyl polychlo- Critical combustion diameter versus pressure for powder N: 1) data of [6]; 2) data of [2]; 3) data of Bespalov (cited from [2]) for powder samples in cellophane casing coated with vinyl polychloride and placed in water; 4) data for powder samples in a metal casing [7]; 5) dependence Dcr = 7p −0.74 obtained by processing data for film-reinforced powder samples placed in water [4]; 6) data for film-reinforced powder samples burned in nitrogen [4].…”

Section: Resultsmentioning

confidence: 99%

“…The critical combustion diameter was studied on samples of nitroglycerin powder N (58% colloxylin, 28% nitroglycerin, 12% dinitrotoluene, stabilizer, and plasticizer), model powder NB (58% colloxylin, 40% nitroglycerin, stabilizer, and plasticizer) [7,24], model powder A (49% colloxylin, 49% nitroglycerin, stabilizer, and plasticizer) [4]. The model powders NB and A differ somewhat in composition but have almost identical pressure dependences of the burning rate: u = 0.9p 0.65 for NB and u = 1.0p 0.64 for powder A, where [u] = cm/sec and [p] = atm (here and below, the pressure is in atmospheres, as in the references cited).…”

Section: Experimental Technique For Determining the Critical Combustimentioning

confidence: 99%

“…The model powders NB and A differ somewhat in composition but have almost identical pressure dependences of the burning rate: u = 0.9p 0.65 for NB and u = 1.0p 0.64 for powder A, where [u] = cm/sec and [p] = atm (here and below, the pressure is in atmospheres, as in the references cited). In the determination of the critical diameter, the heat release from the combustion zones to the ambient inert medium was increased as follows: the sample was tightly enclosed in an aluminum or brass casing (as in [7]) or was reinforced with a polyethylene film 45 or 200 µm thick with an adhesive layer and placed in water (as in [4]). The samples were ignited from the end protruding for 3-4 mm above the casing or water level.…”

Section: Experimental Technique For Determining the Critical Combustimentioning

confidence: 99%

“…It was shown that the burning rate decreased with decreasing charge (tube) diameter, and at a certain diameter the combustion terminated. Later a number of researchers from the Mendeleev ChemicalTechnological Institute by [2][3][4] and the Semenov Institute of Chemical Physics of the Russian Academy of Sciences [5][6][7][8] addressed experiments of this kind. Some disagreement between the results of those studies was due to the difference in the heat-transfer conditions on the boundaries of the samples being burned.…”

Section: Introductionmentioning

confidence: 99%

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Critical diameter and transverse waves of powder combustion

Marshakov

Istratov

2007

Combust Explos Shock Waves

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A critical review is given of the problem of powder extinction with a decrease in the sample diameter due to heat release. The results of our experimental studies of the critical combustion diameter are presented. A comparison of the experimental data on the critical diameter as a function of burning rate is shown to be the most informative. These functions follow a power law with an exponent of −1.15 to −1.17. The relations between the sizes of the cells (hot spots) formed by the set of transversewaves on the burning surface and the burning rate follow the same law. The sizes of the cells are 2.1-2.3 times smaller than the critical combustion diameter. It is also found that the transverse wave decays if its curvature exceeds a critical value.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Technique For Determining the Critical Combustimentioning

confidence: 99%

Section: Experimental Technique For Determining the Critical Combustimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Critical diameter and transverse waves of powder combustion

Marshakov

Istratov

2007

Combust Explos Shock Waves

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Low-temperature combustion of energetic materials in filled polymer systems

Mikhailov

Алешин

Leonova

2007

Combust Explos Shock Waves

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In systems filled by inert additives, combustion of cellulose nitrate (CN) proceeds in a flameless low-temperature regime with a low linear burning rate. At a standard temperature, the exponent in the low of CN combustion in ballasted mixtures with inert additives in the pressure range of 0.1 to 10 MPa is several times lower than that of pure cellulose nitrate and amounts to 0.23. The qualitative and quantitative composition of gaseous products of flameless CN conversion is found. It is noted that this composition approximately corresponds to data available in the literature for the products of thermal decomposition of cellulose nitrate at comparatively low temperatures. Based on this fact and on a weak dependence of the CN burning rate on pressure in ballasted systems, the process under these conditions is assumed to be controlled by conversion of the energetic component predominantly in the condensed phase. In the case of a composite consisting of cellulose nitrate, silicon carbide, and polymer binder, for samples 10-25 mm in diameter, armoring exerts practically no effect on combustion parameters. Combustion of the same mixture with smaller diameters of non-armored samples is unstable. The presence of a liner establishes a clearly expressed critical combustion diameter in the examined systems.

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Effect of the curvature of the burning surface of condensed energetic materials on the burning rate

Rashkovskii

2011

Combust Explos Shock Waves

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Combustion and extinction of a ballistite propellant at critical diameter

Cited by 5 publications

References 0 publications

Critical diameter and transverse waves of powder combustion

Critical diameter and transverse waves of powder combustion

Low-temperature combustion of energetic materials in filled polymer systems

Effect of the curvature of the burning surface of condensed energetic materials on the burning rate

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