Abstract
A determination of temperature distributions in an axisymmetric propane-air premixed flame by holographic interferometry is described. In order to quantify the flame temperature from interferometric data, it is necessary to separate the effect of temperature changes and gas composition changes on refractivity. The gas composition profiles are estimated from the assumption of similarity between temperature and gas concentration fields. The relations between fringe number and temperature are derived for combustion gases and the factors that control the accuracy are discussed. The results show that the corrected temperature using estimated gas concentration agrees well with one using measured values.
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