The location of ignition is chosen in a zone where the flow velocity,
on the stoichiometric surface,
is larger than SLo.
Soon after ignition,
aflame base propagates at the stoichiometric burning velocity SLo.
Both iso- SLo and iso-Zs are displaced by the flame so that they come into contact at the triple point (Fig. 13).
Then, an upstream flame movement is organized,
where the flow deflection due to heat release continuously insures that the iso- SLo.
and iso-Zs stay in contact at the flame tip.
The flame base finally stops moving upstream,
when the local conditions do not allow for further propagation into the larger jet velocities. The final and steady conditions are displayed in Fig. 14 for various jet Reynolds numbers for large heat release (τ=5).