Temperature Stratification Induced Ignition Regimes for Gasoline Surrogates at Engine-Relevant Conditions

End-gas auto-ignition leading to knocking combustion is one of the major barriers achieving higher thermal efficiencies in downsized boosted spark-ignition engines. Despite available framework addressing hotspot-induced ignition (detonation peninsula), a quantitative investigation on gasoline surrogates yet be done. In particular, effect negative temperature coefficient (NTC) chemistry distribution modes detonation peninsula still missing. Using established one-dimensional (1D) theoretical and computational framework, average (including NTC range), initial pressure, ethanol addition are investigated. Moreover, appearance chemistry-related events i.e. coolspots, secondary kernels, off-centered analyzed using 1D simulations. The results as follows. 1) affects regimes dynamics front propagation via altering reactivity gradient. 2) increases gradient range associated with regime. 3) may inhibit development by simultaneously promoting spontaneous/supersonic modes. 4) An blend decreases knock propensity; however, lower ignitability promote strong shock waves. 5) Finally, result normal at pressures (20 bar). However, elevated (50 bar), noted yield pressure intensities resembling super-knock.