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Study on combustion oscillation characteristics of micron aluminum particles
Powder Technology ( IF 5.2 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.powtec.2021.09.024
Lei Han , Junwei Li , Yanbin Wang , Wenhao Yu , Junlong Wang , Ning Wang , Ningfei Wang

Aluminum (Al) particles are regarded as general addictive into solid propellants not only as an extra energy source but also as a metallic damping-carrier on combustion instability. It is possible that the stability in propellant can be improved through partial Al substitution. However, knowledge of unsteady combustion characteristics of Al particles has been insufficient. In order to explore the unsteady combustion and attenuation characteristics of Al particle, a methane micro-combustor is designed. The acoustic oscillation of combustor is found to be excited, regardless of the Al particles mass of diameter. Moreover, the effects of 1) particle size and 2) mass are examined in detail. The burning of micro-sized Al particles in present experiment is attributed to melt dispersion mechanism. The rupture time is in the range of 2.18 ms to 2.81 ms for Al particles with mean diameter of 10 μm, 20 μm and 30 μm. With the increasing of particle size, the sound level of high-frequency oscillation increases from 65 dB to 85 dB. However, the attenuation effect for high-frequency oscillation is weakened for larger particle size. Finally, it is found that the pressure growth rate can be dramatically increased from 1000 Pa/s to 11,000 Pa/s and the peak amplitude of high frequency oscillation is augmented, as the Al particles mass ratio is increased. The present research sheds lights on an effective evaluation of unsteady Al combustion by considering particles parameters.



中文翻译:

微米铝颗粒燃烧振荡特性研究

铝 (Al) 颗粒被认为是固体推进剂的普遍添加剂,不仅作为一种额外的能源,而且作为燃烧不稳定性的金属阻尼载体。推进剂中的稳定性有可能通过部分铝置换来提高。然而,关于铝颗粒的非稳态燃烧特性的知识还不够。为了探究铝颗粒的非稳态燃烧和衰减特性,设计了一种甲烷微型燃烧器。发现燃烧器的声振荡被激发,而与直径的铝颗粒质量无关。此外,还详细检查了 1) 粒度和 2) 质量的影响。本实验中微尺寸铝颗粒的燃烧归因于熔体分散机制。破裂时间在 2.18 ms 到 2 的范围内。平均直径为 10 μm、20 μm 和 30 μm 的 Al 颗粒为 81 ms。随着粒径的增加,高频振荡的声级从65 dB增加到85 dB。然而,对于较大的粒径,高频振荡的衰减作用减弱。最后发现,随着铝颗粒质量比的增加,压力增长速率可以从 1000 Pa/s 急剧增加到 11,000 Pa/s,并且高频振荡的峰值幅度增大。本研究通过考虑颗粒参数阐明了对非稳态铝燃烧的有效评估。粒径越大,高频振荡的衰减效果越弱。最后发现,随着铝颗粒质量比的增加,压力增长速率可以从 1000 Pa/s 急剧增加到 11,000 Pa/s,并且高频振荡的峰值幅度增大。本研究通过考虑颗粒参数阐明了对非稳态铝燃烧的有效评估。粒径越大,高频振荡的衰减效果越弱。最后发现,随着铝颗粒质量比的增加,压力增长速率可以从 1000 Pa/s 急剧增加到 11,000 Pa/s,并且高频振荡的峰值幅度增大。本研究通过考虑颗粒参数阐明了对非稳态铝燃烧的有效评估。

更新日期:2021-09-21
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