Fractal aspects in O2 enriched combustion

•We studied combustion process stability.•We used Detrended Fluctuation Analysis (DFA).•We discuss the combustion efficiency.•We observe an auto-affinity in the time series.

In this study, we investigate the self-affinity of time series of thermal radiation from two fuels, natural gas (NG) and acetylene (AC), enriched with oxygen at 21%, 23% and 25% concentrations during the combustion process. We used the detrended fluctuation analysis method to evaluate the burning process of these fuels. We found a well-defined self-affine aspect for these gases in this dynamic process. Using the proposed method, we were able to characterize the time series of NG as a sub-diffusive process and the time series of AC as a process with persistent self-affinity.