Combustion analysis of a stratified pre-chamber ignition system by means of a zero-dimensional turbulence and flame speed model

In the current work, combustion process inside a stratified pre-chamber ignition system is analyzed. The installed on Rapid Compression-Expansion Machine (RCEM) and runs at different combinations of fuel-air equivalence ratio in main chamber as well pre-chamber, which controlled by fuel injection during compression stroke. order to analyze results detail, zero-dimensional model for proposed. First, K-k-ϵ developed calibrated according three-dimensional simulations motoring conditions performed Computational Fluid Dynamic solver (Converge). Then, thermodynamic including mass exchange between both chambers wells heat transfer losses walls used compute instantaneous release rate pre-chamber. Both pieces information are combined evaluate effective flame propagation speed, also decouple effects terms laminar turbulence-flame interaction gas velocity due expansion burned products. speed values obtained consistent when maintained, regardless chamber, while significant deterioration seen once lean operation appears Finally, compared an average estimated from broadband chemiluminescence visualization tests, showing good consistency with predictions.