Effects of hydrogen enrichment and turbulence intensity on the combustion mode in locally stratified dual-fuel mixtures of n-dodecane/methane

In dual-fuel (DF) engines, a high-reactivity fuel (HRF) ignites low-reactivity (LRF) premixed with air. Identification of the combustion mode after autoignition in DF engines different combinations and under various mixture stratification levels is crucial importance since may affect engine performance emissions levels. However, to avoid expensive computational or experimental tests for initial conditions, an analytical diagnostics tool can help identify modes combustion. Recently, we developed a-priori (?-curve), which separates between deflagration spontaneous transient problems based on two parameters: HRF amplitude wavelength. analysis was only evaluated single combination 2D turbulent conditions. The present study extends our previous work by (1) evaluating 1D ?-curve more common including hydrogen, (2) extending 3D First, using numerical simulations, new n-dodecane methane without hydrogen enrichment LRF blend investigated. Although shortens duration, its role changing remains subtle. Therefore, n-dodecane/methane (no enrichment) considered simulations highly enrichment. Second, flame-resolved variations mixtures at three turbulence intensities are studied. It observed that high switch from autoignition. For first time, diagnostic compared correction factor proposed equation.