A multi-mode combustion diagram for spark assisted compression ignition

A computational study and correlation of premixed isooctane–air laminar reaction front properties under spark ignited and spark assisted compression ignition engine conditions

“…As U is reduced to lower load, the deflagration portion of combustion contributes less to the overall heat release, because the reaction front time increases relative to the ignition delay, and auto-ignition becomes the more dominant combustion mode. This behavior reinforces the previous analysis of experimental SACI data [43] which suggests that homogeneous SACI combustion is most useful for ignition timing and burn rate control under medium and high load operating conditions.…”

“…3 and Table 2. The current simulations considerably extend upon the range of previous works, such as Metghalchi and Keck [21] and Müller et al [25], and now include data in both the SI and SACI combustion regimes as outlined in [43]. Of the simulated conditions, 481 produced steady laminar reaction fronts that were used for the correlation of laminar burning velocity and thickness.…”

“…While the power law performs well for moderately lean and stoichiometric conditions, the burning velocity significantly diverges from the HCT simulations as U approaches the lean limit, which is predicted as a constant U = 0.57 by the power law form. This limit is significantly richer than that of the HCT simulation trend and the equivalence ratios used within SACI engine experiments [43].…”

A Regime Diagram for Autoignition of Homogeneous Reactant Mixtures with Turbulent Velocity and Temperature Fluctuations

“…These include aircraft engines operating at higher inlet temperatures (Lieuwen et al, 2013), low temperature combustion engines (Lavoie et al, 2010), and stationary gas turbines using lean premixed combustion (US DOE, 2009), among many examples. Under these conditions, autoignition often becomes a dominant process for burning.…”

Effect of crevice mass transfer in a rapid compression machine

“…Various advanced combustion strategies [e.g. [1][2][3][4][5] share the common denominator of dilute, high pressure, low temperature combustion. This combustion regime is different from the traditional SI and CI engines and operation at these low temperature strategies is significantly kinetically-influenced by the complex low temperature chemistry of hydrocarbon fuels.…”