二氧化碳浓度对含氧大气中硼结块燃烧特性的影响

Lian Duan, Zhixun Xia, Yunchao Feng, Binbin Chen, Jiarui Zhang, Likun Ma
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摘要

在冲压式喷气燃烧室中,碳质燃料燃烧产生的二氧化碳(CO2)与硼团聚体一起进入燃烧室。为了研究含氧大气中二氧化碳浓度对硼团聚体燃烧特性和氧化机制的影响,我们使用了激光点火系统、X 射线衍射仪(XRD)和热重-差示扫描量热仪(TG-DSC)组合热分析系统。单颗粒硼作为对照组在激光点火实验中进行了测试。点火实验结果表明,在氧气浓度固定为 20% 的情况下,当颗粒温度达到硼的熔点时,二氧化碳含量的增加会导致硼团聚体的燃烧过程从单粒熔滴燃烧过渡到多孔颗粒燃烧。此外,XRD 分析结果表明,硼颗粒在 O2 和 CO2 混合气氛中的凝聚相燃烧产物(CCPs)含有 B4C,而 B4C 正是颗粒多孔结构的成因。在低于 1200 °C 的温度下,加入 CO2 对硼放热反应没有明显的促进作用。然而,在激光点火实验中,当氧气浓度固定为 20% 而二氧化碳浓度从 0% 增加到 80% 时,硼团聚体的最高温度从 2434 K 上升到 2573 K,单颗粒硼的自持燃烧时间从 396 ms 下降到 169 ms,硼团聚体的自持燃烧时间从 198 ms 下降到 40 ms。这项研究最终表明,在含氧气氛中加入二氧化碳有利于硼的反应和消耗途径,这有利于促进硼团聚体在相对较高温度下的放热反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of carbon dioxide concentration on the combustion characteristics of boron agglomerates in oxygen-containing atmospheres
In ramjet combustion chambers, carbon dioxide (CO2) produced by the combustion of carbonaceous fuel enters the chamber together with boron agglomerates. In order to investigate the effect of CO2 concentration present in an oxygen-containing atmosphere on the combustion characteristics and oxidation mechanisms of boron agglomerates, we used a laser ignition system, an X-ray diffractometer (XRD), and a thermogravimetric-differential scanning calorimetry (TG-DSC) combined thermal analysis system. Single-particle boron was tested in the laser-ignition experiments as the control group. The ignition experiment results showed that with a fixed O2 concentration of 20%, when the particle temperature reaches the melting point of boron, increasing CO2 content causes the combustion process of boron agglomerates to transition from single-particle molten droplet combustion to porous-particle combustion. Furthermore, XRD analysis results indicated that the condensed-phase combustion products (CCPs) of boron particles in a mixed atmosphere of O2 and CO2 contained B4C, which is responsible for the porous structure of the particles. At temperatures below 1200 °C, the addition of CO2 has no obvious promotion effect on boron exothermic reaction. However, in the laser-ignition experiment, when the oxygen concentration was fixed at 20% while the CO2 concentration increased from 0% to 80%, the maximum temperature of boron agglomerates rose from 2434 to 2573 K, the self-sustaining combustion time of single-particle boron decreased from 396 to 169 ms, and the self-sustaining combustion time of boron agglomerates decreased from 198 to 40 ms. This study conclusively showed that adding CO2 to an oxygen-containing atmosphere facilitates boron reaction and consumption pathways, which is beneficial to promoting exothermic reaction of boron agglomerates at relatively high temperatures.
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