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| 火灾烟雾光散射特性数值模拟方法研究 |
| Study on numerical simulation method of light scattering characteristics of fire smoke |
| 投稿时间：2025-04-02 修订日期：2025-05-29 |
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| DOI： |
| 基金项目:民航飞机货舱抗误报火灾探测机理与关键技术：No.U2133201 |
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| 中文关键词: 火灾烟雾探测 光散射 DDA T矩阵 |
| 英文关键词:fire smoke detection light scattering DDA T-matrix |
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| 中文摘要: |
| 为探究适宜火灾烟雾光散射特性研究的数值模拟方法，通过改变尺寸参数、折射率、DDA偶极子间距等可能影响T矩阵和DDA计算准确性的因素，构建了一系列不同的模型对两种方法计算准确性进行评估。研究结果表明：在模拟火灾烟雾的光散射特性时，T矩阵方法相较于DDA方法展现出更高的计算准确性，且由于DDA在计算前需要考虑设定合适的偶极子数量，T矩阵使用也更为简便。针对火灾烟颗粒分形结构模型，在0°~20°的前向散射角范围内，两种方法对六个散射矩阵元素的计算结果能够和实验数据有较好的吻合，在140°~180°的后向散射角范围内，两种方法能够对F11/F11(10°)、-F12/F11、F34/F11三个散射矩阵元素计算出与实验数据较为接近的数值。研究结果可为火灾烟雾探测领域的数值模拟方法选用提供理论和数据支撑。 |
| 英文摘要: |
| In order to explore the numerical simulation method suitable for the study of light scattering characteristics of fire smoke, a series of different models were constructed to evaluate the calculation accuracy of the two methods by changing the size parameters, refractive index, DDA dipole spacing and other factors that may affect the calculation accuracy of T matrix and DDA. The results show that the T-matrix method shows higher calculation accuracy than the DDA method when simulating the light scattering characteristics of fire smoke, and because the DDA needs to consider setting the appropriate number of dipoles before calculation, the T-matrix is also easier to use. For the fractal structure model of fire smoke particles, in the range of 0 ° ~ 20 ° forward scattering angle, the calculation results of six scattering matrix elements by the two methods can be in good agreement with the experimental data. In the range of 140 ° ~ 180 ° backward scattering angle, the two methods can calculate the three scattering matrix elements of F11/F11(10°), -F12/F11 and F34/F11, which are close to the experimental data. The research results can provide theoretical and data support for the selection of numerical simulation methods in the field of fire smoke detection. |
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