Errors in Using Balance Relations in the Theory of Combustion of Condensed Systems

IF 0.9 4区工程技术 Q4 ENERGY & FUELS Combustion, Explosion, and Shock Waves Pub Date : 2023-12-01 DOI:10.1134/s0010508223060102

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Abstract

Due to the total lack of reliable experimental data on the kinetics of solid-phase transformations at high temperatures, adequate estimates of the ignition and combustion characteristics of real energetic materials are currently unavailable. In combustion theory, balance relations in the form of ignition criteria and in the form of the principle of equivalence of the burning rate increase under the action of a radiant flux to the corresponding increase in the initial temperature are used in most cases without sufficient theoretical justification, what can lead to incorrect results. Numerical simulation of the ignition and combustion of model energetic materials can provide a basis for determining the conditions for the correct use of balance relations. In this work, using a model of unsteady combustion of melting energetic materials, ignition and combustion under the action of a radiant flux have been studied numerically and the fitting coefficients in the balance relations have been obtained. It has been shown that the values of these coefficients depend on the kinetic parameters of solid-phase transformations and the intensity of the external heating source. It is concluded that it is necessary to continue the theoretical research aimed at developing valid approaches to determine the parameters of global reactions in the condensed phase using data on the delay of ignition by heat flux and to determine the correct fitting coefficients when using the equivalence principle.

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凝结体系燃烧理论中使用平衡关系的误区

摘要由于完全缺乏有关高温下固相转化动力学的可靠实验数据，目前无法对实际高能材料的点火和燃烧特性进行充分估计。在燃烧理论中，点火标准形式的平衡关系和辐射通量作用下燃烧速率增加与初始温度相应增加的等效原则形式的平衡关系在大多数情况下都是在没有充分理论依据的情况下使用的，这可能会导致错误的结果。对高能材料模型的点火和燃烧进行数值模拟，可以为确定正确使用平衡关系的条件提供依据。在这项工作中，利用高能材料熔化非稳态燃烧模型，对辐射通量作用下的点火和燃烧进行了数值研究，并获得了平衡关系中的拟合系数。研究表明，这些系数的值取决于固相转化的动力学参数和外部加热源的强度。结论是，有必要继续开展理论研究，以制定有效的方法，利用热通量延迟点火的数据确定凝聚相中的全局反应参数，并在使用等效原理时确定正确的拟合系数。

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来源期刊

Combustion, Explosion, and Shock Waves 工程技术-材料科学：综合

CiteScore

1.60

自引率

16.70%

发文量

审稿时长

5.7 months

期刊介绍： Combustion, Explosion, and Shock Waves a peer reviewed journal published in collaboration with the Siberian Branch of the Russian Academy of Sciences. The journal presents top-level studies in the physics and chemistry of combustion and detonation processes, structural and chemical transformation of matter in shock and detonation waves, and related phenomena. Each issue contains valuable information on initiation of detonation in condensed and gaseous phases, environmental consequences of combustion and explosion, engine and power unit combustion, production of new materials by shock and detonation waves, explosion welding, explosive compaction of powders, dynamic responses of materials and constructions, and hypervelocity impact.