Environmental Engineering Reference
In-Depth Information
Similarly, the modern semi-empirical simple emission models should provide
guidance for the engine operating lines from sea-level to the maximum-cruising
altitude; and they should be as reliable as the engine performance models which are
used routinely for on-board mission fuel burn calculations. Therefore, CO and NO x
emission characteristics along the sea-level operating lines were presented by
Mongia ( 2008 ) of the 12 combustors that included rich and lean domes of the N-1
and N-generation engines. Simple engineering correlations for both sea-level and
altitude engine operating lines have given promising results worth pursuing for
future investigations; details are given in Mongia ( 2010a , b ) with summary
gures
reproduced as Figs. 46 , 47 and 48 for the selected
five modern rich domes along
their sea-level engine operating lines. These correlations are good for the range of
combustor inlet temperatures (T 3 ) and pressures (P 3 ); the adiabatic stoichiometric
fl
ame temperature (T (Tstoich); ); HC, CO, and NO x
in EI in terms of maximum,
Fig. 46 Comparison between EINO x correlations versus data from idle to maximum takeoff thrust
for the modern rich-domes, namely Comb 1, Comb 2, Comb 5, Comb 6, and Comb 7. The range of
the root-mean-square errors is 0.23 - 0.47 EI and 1.2 - 3.1 %; Source Mongia ( 2010a , b )
Fig. 47 Comparison between EICO correlations versus data from idle to maximum takeoff thrust
for the modern rich-domes, namely Comb 1, Comb 2, Comb 5, Comb 6, and Comb 7. The range of
the root-mean-square errors is 0.7
-
2.5 EI; Source Mongia ( 2010a , b )
Search WWH ::




Custom Search