Correlation of equivalence ratio with spectrometric analysis for premixed combustion

Abstract

The present study deals with the application of spectrometry in correlating flame colour with relevant equivalence ratios in the entire flammability limit, extending from lean blowout to rich blowout. A swirl-stabilized, LPG-fueled dump combustor was used for this purpose. The predominance of a specific colour at a particular equivalence ratio is noted viz. the predominance of red wavelength in richer regimes of operation, and that of blue wavelength in leaner regimes. The practical application of blow out prediction is significant in the gas-turbine industry. The salient contribution from the present study is the development of prediction parameters for both lean and rich blow out at low flow rates. Apart from spectrometric analysis, an attempt has also been made to predict RGB-intensity values using image processing tools.