Estimation of Radiative and Scattering Characteristics of Sodium Aerosols Using Inverse Analysis

利用反演分析估计钠气溶胶的辐射和散射特性

• 批准号: 13450079
• 负责人: KUDO Kazuhiko
• 金额: $ 4.48万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450079/
• 关键词: radiative transfer; complex index of refraction; inverse problem; sodium aerosol; sodium fire; Mie scattering; numerical analysis; Monte Carlo method; 複素屈折率同定

Estimation method is studied for complex index of refraction of aerosol generated by sodium fire. In the present study, non-gray radiative transfer analysis is carried out to simulate the radiative transmission through uniformly distributed dispersed aerosol layer for given values of complex index of refraction considering multiple scattering. The Monte Carlo method is used for the analysis.Using the program, several sets of contour curves of the transmittance of aerosol layer are obtained at several positions on the wall situated opposite to the black body furnace for a wide range of complex index of refraction of the aerosol. The transmittance is obtained for the radiation emitted from a black body furnace. The complex index of refraction of the aerosol is estimated by comparing the value of the transmittance obtained by experiment with the contour curves of transmittance obtained by analysis.The experiment to obtain transmittance of aerosol layer is carried out using magnesium oxide aerosol, whose spectral complex index of refraction is well known. The aerosol is generated by igniting magnesium ribbon, and is fed by air flow to duct with a rectangular cross section. The particle size distribution of the generated aerosol is measured by a microscope with a magnifying power of 3000. The mass concentration of the aerosol is measured by weighting the paper filter set at the end of the duct. Radiative transmittance of the aerosol layer flowing through the duct is measured using a radiation meter set opposite to a black body furnace.From the comparison of the results of the experiment and the contour curves by analysis, the complex index of refraction of magnesium oxide is estimated with good accuracy. From the result, it is concluded that the value of complex index of refraction of aerosol can be estimated by the present method.

研究了钠火气溶胶复折射率的估算方法。在本研究中，非灰色的辐射传输分析进行模拟辐射传输通过均匀分布的分散气溶胶层的复折射率给定值考虑多次散射。本文用蒙特卡罗方法进行了分析，得到了在较宽的气溶胶复折射率范围内，在黑体炉对面的几个位置上气溶胶层透过率的等值线。透射率是从黑体炉发射的辐射获得的。通过实验得到的透过率值与分析得到的透过率等值线比较，估算出气溶胶的复折射率，并利用光谱复折射率已知的氧化镁气溶胶进行了气溶胶层透过率的实验。气溶胶是通过点燃镁带产生的，并通过气流输送到具有矩形横截面的管道。通过放大倍率为3000的显微镜测量所产生的气溶胶的粒度分布。气溶胶的质量浓度是通过称量设置在管道末端的滤纸来测量的。用辐射计对着黑体炉测量了流经管道的气溶胶层的辐射透过率，通过分析比较实验结果和等值线曲线，得到了氧化镁的复折射率，具有较好的精度。结果表明，该方法可以估算气溶胶的复折射率。

项目成果

KUDO K., LI B. X., AZUMA Y., TAKATA T.: "Development of Estimation Method of Complex Refractive Index of Aerosol Generated by Sodium Fire"Proc. Of the 6th ASME-JSME Thermal Engineering Join Conference. TED-AJ03-152. (2003)

KUDO K.，LI B. X.，AZUMA Y.，TAKATA T.：“钠火产生的气溶胶复折射率估计方法的开发”Proc。

KUDO, K., et al.: "Development of Estimation Method of Complex Refractive Index of Aerosol Generated by Sodium Fire"Proc.of the 6th ASME-JSME Thermal Engineering Joint Conference. (2003)

KUDO, K., 等：“钠火产生的气溶胶复折射率估算方法的开发”，第六届 ASME-JSME 热工联席会议论文集。

KUDO K., et al.: "Development of Estimation Method of Complex Refractive Index of Aerosol Generated by Sodium Fire"Proc. of the 6th ASME-JSME Thermal Engineering Joint Conference. (2003)

KUDO K.等人：“钠火产生的气溶胶复折射率估计方法的开发”Proc。