New insights into the pre-ignition behavior of methane behind reflected shock waves

Abstract Pre-ignition is an undesired combustion event known to restrict kinetic modeling validation. Previous methane oxidation studies reported premature ignition as part of delay time measurements in shock tubes. In this context, the effect on pre-ignition propensity and auto-ignition behavior stoichiometric mixtures at different dilution levels $$\hbox {N}_2$$ N 2 , Ar, He, {CO}_2$$ CO was studied 10 bar 25 temperatures between 1080 K 1350 K. addition conventional sidewall pressure endwall light emission measurements, a high-speed imaging setup utilized visualize process. Relevant physicochemical parameters describe predict phenomenon were used. The results suggest that up $$80\%$$ 80 % bath gas are not successful mitigating early occurrence its effects moderate pressures. Replacing by He found suppress bar, attributed enhanced dissipation temperature inhomogeneities test section. present findings demonstrate has potential for heat release mitigation, while Ar confirmed promote ignition. To best our knowledge, we first detailed study mitigation tubes, where further insights into non-idealities given.