where SL is the laminar flame speed, Bm the maximum
laminar speed, BV the laminar speed roll-off value, F the incylinder
equivalence ratio, Fm the equivalence ratio at
maximum speed, Tu the temperature of the unburned gas,
RMF the mass fraction of the residuals in the unburned zone,
a and b the temperature and pressure ratio exponents, g
a dilution exponent multiplier, T the temperature and p the pressure. The jet ignition pre-chamber is not modeled
directly. Results of engine experiments including flame visualizations
and pressure traces and CFD computations [1–11]
with hydrogen as the pre-chamber fuel and various main
chamber fuels show jet ignition produces a flame behavior
similar to the one of standard spark plug but with a much
faster overall rate of combustion suffering much less fall off as
the mixture equivalence ratio becomes leaner than for unassisted
combustion.