The Effect of Aluminum in Its Mixtures With Ammonium Nitrate on the Ignition of Burning and Its Transition to the Convective Burning Regime

IF 1.4 4区化学 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Russian Journal of Physical Chemistry B Pub Date : 2024-09-11 DOI:10.1134/s1990793124700611

V. E. Khrapovskii, V. G. Khudaverdiev, A. A. Sulimov, P. V. Komissarov, S. S. Basakina

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Abstract

The ignition of the normal layer-by-layer burning (LB) and its transition to the convective burning (CB) regime in mixtures of ammonium nitrate (AN) with bulk density aluminum are studied. Experiments in a constant-volume bomb with pressure registration are carried out. The porosity of the samples is 0.55–0.59, the particle size of the AN varies from 20–40 to 250–630 µm, and the aluminum content varies from 8 to 47 wt %. Two brands of aluminum were used: ASD-4 and PAP-2. It is shown that the mixtures are capable of being ignited when the igniter pressure is close to or above the critical (minimum) value. The values of the critical pressure of the igniter, the pressure, and the time at which LB and CB occurs for mixtures with different particle sizes of AN and aluminum and different concentrations are measured. The replacement of aluminum ASD-4 with PAP‑2 leads to a significant (by an order of magnitude or even more) decrease in the values of critical pressure and pressures at which LB and CB begins.

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铝与硝酸铵混合物对点燃燃烧及其向对流燃烧过渡的影响

摘要研究了硝酸铵（AN）与体积密度为铝的混合物中正常逐层燃烧（LB）的点火及其向对流燃烧（CB）制度的过渡。实验在带有压力登记的恒容炸弹中进行。样品的孔隙率为 0.55-0.59，硝酸铵的粒度从 20-40 微米到 250-630 微米不等，铝的含量从 8% 到 47% 不等。使用了两种品牌的铝：ASD-4 和 PAP-2。研究表明，当点火器压力接近或高于临界值（最小值）时，混合物能够被点燃。测量了不同粒径的 AN 和铝以及不同浓度的混合物的点火器临界压力值、压力以及发生 LB 和 CB 的时间。用 PAP-2 替代铝 ASD-4，会导致临界压力值和开始发生枸杞爆裂和枸杞气化的压力值显著降低（数量级甚至更高）。

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来源期刊

Russian Journal of Physical Chemistry B 化学-物理：原子、分子和化学物理

CiteScore

2.20

自引率

71.40%

发文量

106

审稿时长

4-8 weeks

期刊介绍： Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.