| 不稳定分布的碳烟消光表征方法及规律分析 |
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| 引用本文： | 刘卫平,马志亮,韦成华.不稳定分布的碳烟消光表征方法及规律分析[J].强激光与粒子束,2015,27(11):111006. |
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| 作者姓名： | 刘卫平 马志亮 韦成华 |
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| 作者单位： | 1.西北核技术研究所, 激光与物质相互作用国家重点实验室, 西安 71 0024 |
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| 摘 要： | 碳烟的消光表征方法有很多种,但对于评价不稳定分布的碳烟体系,需要花费较大的代价。基于RDG-FA理论提出了一种相对简便易行的适用于不稳定分布碳烟的消光表征方法,即以碳烟的质量浓度权重的平均质量消光系数来评价碳烟的消光特性。根据理论推导,碳烟的消光系数为平均质量消光系数和总质量浓度之积,而平均质量消光系数表达式中的各项均可通过理论分析、计算和实验方法得到。另外,对平均质量消光系数随碳烟粒径和聚合粒子尺寸的变化规律进行了理论分析,预测随着碳烟粒径和聚合粒子尺寸减小,碳烟的平均质量消光系数先快速减小,然后进入缓变区,慢慢减小。
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| 关 键 词： | 碳烟 消光表征 RDG-DA理论 平均质量消光系数 |
| 收稿时间： | 2015-08-20 |
Extinction characterization method and extinction tendency analysis for soot with unsteady distribution |
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| Affiliation: | 1.State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology,Xi’an 710024,China |
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| Abstract: | There are many extinction characterization methods for soot, but they always cost much when used to appraise the extinction characteristics of soot with unsteady distribution. This paper introduces a simple extinction characterization method. It appraises the extinction characteristics of the soot with its mean mass extinction coefficient weighted with the mass concentration. According to the theory derivation, the extinction coefficient of the soot is the product of the mean mass extinction coefficient and the total mass concentration. Fortunately, every term in the expression of mean mass extinction coefficient can be obtained by theoretical and experimental methods. A theoretical analysis of variance tendency of mean mass extinction coefficient is carried out associated with the variance of diameters and aggregate sizes of the soot. It predicts that the mean mass extinction coefficient decreases significantly at first with the decrease of the diameters and aggregate sizes of the soot, and then slightly since it enters into the glacis. |
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