Experimental study of furan oxidation behind shock waves

This work presents new information on the interaction of a promising biofuel - furan and the products of its decomposition with molecular oxygen under conditions simulating combustion processes. The investigations were carried out using the precision method of atomic resonance absorption spectroscopy on a high-purity shock tube behind reflected shock waves in an ultra-dilute mixture of 10 ppm C₄H₄O + 10 ppm O₂ in Ar in the temperature range 1600-4000 ± 50 K at pressures of 1.5-3 bar. During the oxidation of the studied fuel mixture time-resolved concentration profiles of the formation and consumption of atomic oxygen were obtained. Based on new experimental data, the predictive efficiency of the modern kinetic model of biofuel combustion developed by the CRECK Modeling Group was assessed, which was also used to demonstrate the key reaction pathways that determine the dynamics of furan oxidation and the corresponding thermophysical processes under the studied chemical and thermodynamic conditions. By comparing experimental and numerical data, a detailed analysis of the pathways for the formation of products and the sensitivity of the rate constants of the occurring elementary reactions was carried out. As a result, refinements to the rate constants of key reaction pathways were proposed and implemented, which significantly increased the predictive abilities of the tested model. The accurate data obtained provide a valuable tool for verifying new kinetic and thermophysical combustion models of multicomponent hydrocarbon fuel mixtures involving promising biofuels.