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Abstract <p>The combustion of aluminum agglomerate particles with a diameter of 215–840 µm in free fall in air at atmospheric pressure has been studied. As the particles burn out, the initially spherically symmetric combustion is replaced by an asymmetric one, fragmentation occurs, and the combustion process ultimately ends with the formation of an oxide residue. These events are characterized by corresponding times. In this paper, the duration of the symmetric combustion stage is determined to be on average 0.5 ± 0.1 of the combustion time. Empirical approximating dependences of the coordinate <i>x</i>(<i>t</i>) and velocity <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({v}\)</EquationSource> <!--CESW2570055Glotov-m1--> </InlineEquation>(<i>t</i>) on time are obtained for particles of different diameters. Analytical calculations of the motion of burning particles were performed assuming that the viscosity of air in the vicinity of the particle is 6.98 × 10<sup>–5</sup> Pa s, which corresponds to an average temperature of 2005 K. By comparing the empirical and calculated dependences <i>x</i>(<i>t</i>) and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({v}\)</EquationSource> <!--CESW2570055Glotov-m2--> </InlineEquation>(<i>t</i>), the dependence of the effective aerodynamic drag coefficient of the particle on its size was determined in the form <i>C</i><sub>d</sub>(<i>D</i>, Re) = (9.33 + 0.13<i>D</i>)/Re, where Re is the Reynolds number from the range 0.2 &lt; Re &lt; 5.2. For estimations, <i>C</i><sub>d</sub> <i>=</i> 77/Re can be used.</p>

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Combustion of Large Aluminum Agglomerate Particles in Air. II. Motion and Combustion Stages of Particles

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • O. G. Glotov,
  • N. S. Belousova,
  • G. S. Surodin

摘要

Abstract

The combustion of aluminum agglomerate particles with a diameter of 215–840 µm in free fall in air at atmospheric pressure has been studied. As the particles burn out, the initially spherically symmetric combustion is replaced by an asymmetric one, fragmentation occurs, and the combustion process ultimately ends with the formation of an oxide residue. These events are characterized by corresponding times. In this paper, the duration of the symmetric combustion stage is determined to be on average 0.5 ± 0.1 of the combustion time. Empirical approximating dependences of the coordinate x(t) and velocity \({v}\) (t) on time are obtained for particles of different diameters. Analytical calculations of the motion of burning particles were performed assuming that the viscosity of air in the vicinity of the particle is 6.98 × 10–5 Pa s, which corresponds to an average temperature of 2005 K. By comparing the empirical and calculated dependences x(t) and \({v}\) (t), the dependence of the effective aerodynamic drag coefficient of the particle on its size was determined in the form Cd(D, Re) = (9.33 + 0.13D)/Re, where Re is the Reynolds number from the range 0.2 < Re < 5.2. For estimations, Cd = 77/Re can be used.