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