%0 Journal Article %A Hirasawa, Taro %A Gotanda, Kunihiro %A Kamata, Yuichi %A Nakamura, Yuji %D 2012 %I Begell House %K CH radical, combustion diagnostic, spectral imaging, chemiluminescence %N 4 %P 0 %R 10.1615/VisMechProc.2013003813 %T VERIFICATION OF CH* EMISSION IMAGING TECHNIQUE AS A MEASURE OF A FLAME'S OVERALL HEAT RELEASE RATE ON A NON-SOOTING METHANE DIFFUSION MICROFLAME %U https://www.dl.begellhouse.com/journals/08456987543b9011,6c2dbf4525681f51,6e000cc611ec5bd2.html %V 2 %X The methodology to obtain combustion characteristics, such as overall heat release rate and heat loss rate based on the received power of CH* emission, is investigated in the present study. First, the relation between the power of CH* emission received on a CCD and the total power of CH* emission from flames, i.e., radiant power from a flame in the CH* emission band, has been examined theoretically and experimentally. The optically thin flame assumption needs to hold in order to obtain the normalized total power of emission, from the normalized received power of emission based on line-of-sight imaging. The optically thin flame assumption on the CH* and H2O emission band has been experimentally verified by taking CH* and H2O emission images from different observation angles. This assumption is shown to hold under non-sooting microflames. Therefore the received power of emission from the flame, obtained by integrating the intensity on the CH* emission image, is shown to be directly proportional to the total power of CH* emission. It is experimentally demonstrated that the relative variation of the flame's overall heat release rate can be estimated by the CH* emission imaging technique based on measurement of the received power of CH* emission under the condition of constant heat loss rate or known heat loss rate. This is useful to estimate the performance of burners, especially microburners or microcombustors. %8 2013-04-01