Future Trends in Commercial Aviation Engines’ Combustion - Novel Combustion Concepts for Sustainable Energy Development - page 160

models will reach the desired accuracy levels. On the downside, the author feels
strongly that without CFD support, the technologist and designers ' process will be

directed toward wrong directions by “ experts ” so frequently that it reduces down to

containing the “ brush re ” almost every week; and that is not a pleasure for anyone.

8 Third Alternative to Rich Domes: AGT101

This brief section with four figures (Figs. 49 , 50 , 51 , and 52 ) is written to share with

the reader the feasibility of a low-NO x combustion concept successfully rig dem-
onstrated for a regenerative automotive gas turbine AGT101 sponsored by a NASA/
DOE effort in the early 1980s because two of the three reasons. First, its calculated
ignition delay time of 0.19 ms at the most critical operating point (viz. T 3 = 1,328 K
and P 3 = 201 kPa) is comparable to 0.27 ms for a 60 OPR hot-day takeoff condition
summarized earlier in Table 5 . Second, an interesting discussion on the two very
different approaches was presented in Mongia ( 2011b ). The author and his coun-
terpart colleague at the Allison Gas Turbines for the AGT100 (Ross et al. 1983 )
used two very different approaches. Further details on the AGT100 liquid premixed
prevaporized combustion system and its CFD analysis are provided by Rizk and
Mongia ( 1990 ). On the other hand, limited description and data on the AGT101 are
provided by Sanborn et al. ( 1983 ) with more details and back-to-back comparison
for the two approaches given in Mongia ( 2011b ). Third, the AGT101 injector has
subsequently been studied by several in the research community (viz. Fureby 2012 ;
Iudiciani et al. 2009 ; Li and Gutmark 2005 , 2006 ) that should be of interest to
combustion technologists.
The AGT101 fuel injector hardware (Fig. 49 ) and its general layout cross-
section, mixer swirler (with high turning radial in ow vanes) followed by a com-

bustor of 4 inch diameter are shown in Fig. 50 . Two types of mixer swirlers (viz.
radial or combination of smaller radial swirler followed by a dome mounted axial

fl

Fig. 49 A concept based fuel injector from Mongia ( 2011b ); known

popularly in the research community as Triple Annular Research Swirlers (TARS)

“ lean-direct injection ”