为了简单并且准确地检测非灰性火焰的温度和发射率,提出了一种基于粒子群算法的多波长测温法。首先,使用光谱仪检测乙烯层流扩散火焰,得到了不同波长不同位置的光谱辐射强度信息;随后,基于光谱辐射强度采用前述提出的基于粒子群算法的多波长测温法计算了乙烯火焰不同位置的温度和发射率,并将计算结果与采用热电偶和比色法的测温结果进行对比,验证了研究提出的方法的可行性和准确性。将该检测方法拓展应用到垃圾焚烧炉炉膛火焰,协同使用光谱仪和多光谱相机,先对光谱仪数据采用研究所提的多波长法计算了发射率函数,修正多光谱相机对应的波段发射率比值,然后将发射率比值和多光谱相机得到的炉膛火焰单色辐射强度用于比色计算,得到了修正的炉膛火焰的温度云图和发射率分布图,修正前后温差达到150K;并进一步估算了炉膛火焰吸收系数和烟黑体积分数沿视线方向的平均水平,反映了垃圾焚烧炉炉膛内不同区域燃烧情况的差异性和辐射介质的空间分布不均匀性。

In order to detect the temperature and emissivity of non-gray flame simply andaccurately, a multi-wavelength temperature measurement method based on particle swarm opti-mization algorithem is proposed. Firstly, the spectral radiation intensity of the ethylene laminar diffusion flame at different wavelengths and different positions was obtained by using a spectrom-eter. Subsequently, based on the spectral radiation intensity, the temperature and emissivity at different positions of the ethylene flame were calculated using the proposed method, and the re-sults were compared with the temperature measurements obtained using thermocouple and colori-metric method, which verified the feasibility and accuracy of the proposed method. The detection method was further applied to the furnace flame of the waste incinerator, and the spectrometer and multispectral camera were used in collaboration. The emissivity function was calculated for the spectrometer data using the proposed multi-wavelength method to correct the emissivity ratio of the corresponding band of the multispectral camera. And then the emissivity ratio and the monochromatic radiation intensity of the furnace flame obtained from the multispectral camera were used for the colorimetric calculations, resulting in corrected distributions of temperature and emissivity of the furnace flame. The temperature difference before and after correction reaches 150 K. The average level of furnace flame absorption coefficient and soot volume fraction along the line of sight were further estimated, reflecting the variability of combustion conditions in dif-ferent areas of the incinerator furnace and the inhomogeneity of spatial distribution of radiation media.