Mastorakos, Kim
Flame stabilisation and propagation are one of the most difficult phenomena to predict accurately. Our CMC calculations show good agreement with experimental data for hydrogen jet flame lift-off heights [4] (Fig. 1) and with the structure of the flame in mixture fraction space. It is also interesting to note that, at the stabilisation point, the scalar dissipation rate is smaller than the value needed for extinction (Fig. 2), again consistent with experimental data. Calculations for the attached piloted turbulent non-premixed flames from University of Delft are also underway using the detailed GRI 3 chemistry.
(Click here to download Dr. Ik Soo Kim's thesis.)
Figure 1.
Lift-off height vs. jet velocity for pure and diluted H2 flames. Experimental data from [4].
Figure 2.
Iso-lines of conditional scalar dissipation rate <N|η=ξst> normalised by its quenching value (73 s-1) superimposed on mean temperature contours. The thick line indicates the iso-line stoichiometric mean mixture fraction for pure H2, Ujet = 680m/s.