化学発光分光法の火炎温度計測への応用

抄録

To examine temperature of the flamelet of turbulent premixed flames, chemiluminescence intensities of OH, CH and C₂ radicals obtained from unstrained methane-air and propane-air premixed flames have been examined using the newly developed chemiluminescence spectroscopy system. It has been shown that the chemiluminescence intensity ratio of 515nm/470nm bands of C₂ obtained both from methane-air and propane-air unstrained flames uniquely depends on the temperature of unstrained methane-air and propane-air flames. To establish a novel technique which enables to estimates the temperature of the near-extinction flamelet of turbulent premixed flames, the relation between the temperature and the chemiluminescence intensity ratio of 515.5nm/470.5nm bands of C₂ radical of strained flames has been sought by using a counter-flow burner. The unique relation between the flame temperature and the chemiluminescence intensity ratio of 515.5nm/470.5nm bands of C₂ radical has been found to exist for the propane-air strained flame. Therefore, it can be concluded that the temperature of flamelets of the propane-air turbulent premixed flame can be estimated by using the relation between the temperature of the strained flame and the chemiluminescence intensity ratio of 515.5nm/470.5nm bands of C₂ radical obtained in the present study.