The two-color method based on CCD cameras is widely used for measuring the combustion temperature field and soot volumefraction field, playing an important role in understanding combustion laws and mastering combustion states. However, most of the existingwork ignores the spectral response characteristics of CCD cameras and regards the detection signals of each channel of the CCD camera asthe radiant energy of the flame at a specific wavelength, which brings errors to the measurement results of combustion temperature and sootvolume fraction. In this work, an ethylene/ air laminar diffusion flame was considered. The impact of various parameters of the spectral response curves (SRC), such as shape, half width, and asymmetry, on the accuracy of reconstructed flame temperature and soot concentration were analyzed. It is found that the influence of SRC shape and bandwidth on the reconstruction accuracy is small, the reconstructionerrors of the temperature field are all below 1% without considering signal error. If the SRC is asymmetric or the center wavelength is inaccurate, there are relatively larger errors in the reconstruction results, and the errors of the temperature field may achieve 2.4% without considering signal error. Through experimental measurement of ethylene laminar diffusion flame by a CCD camera, it is found that thereis a significant deviation between the measurement results using the center wavelength and the actual SRC, and the maximum temperatureand maximum soot volume fraction errors are 4.74% and 16.4%, respectively.

韩磊(1999—),男,天津人,硕士研究生。E-mail:hl18810412859@163.com

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HAN Lei,CHENG Yong,ZHU Ningjing,et al.Effect of spectral response curves on accuracy of combustion measurementtechniques based on two-color method[J].Clean Coal Technology,2024,30(8):128-137.