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
)
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