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Fig. 52 Measured CO versus
NO
x
characteristics of the
mixer con
guration for the
airflow distribution shown in
Fig.
51
at the simulated max-
max operating point; from
Mongia (
2011b
)
the mixing length (viz. 0.975
in Fig.
51
) that prevents it from calling an LDI; but
the same argument can be levied against LDI-2 of Fig.
43
. We can call it by any
name; but it surely gave very low NO
x
″
(by more than an order of magnitude
compared to diffusion
fl
flame combustors) and survived very high T
3
values.
9 Operability and Dynamics
No article on modern aviation engine combustion products is considered complete
without making some comments about operability and combustion dynamics. We
have covered operability topic already; and only a few summary statements will be
made regarding combustion dynamics in this section. Even though the author
n-
ished his graduate studies on unsteady combustion dynamics (Murthy and Mongia
1969
; Mongia and Ambs
1974
), he was fortunate enough not to run into gas turbine
combustion dynamics until 1994; even his
first experience on a small industrial
engine dry NO
x
combustion product before 1994 did not get him to face com-
bustion dynamics. It is good karma because he believes in the statement frequently
made by one of his most able co-workers, Tim Held,
“
No one is expert in dynamics;
we all are victims.
s close friends have made seminal contri-
butions; and he is grateful for the several outstanding topics on the subject matter
(Culick et al.
1993
; Lieuwen and Yang
2005
; Lieuwen
2012
), because they have
added considerably to his fundamental knowledge base on combustion dynamics.
He is happy to see the continuing commitment in the research community including
the 2013 Best Paper of the AIAA propellant and Combustion Technical Committee,
Caux-Brisebois et al. (
2013
), and a recent paper by his colleague, Prof. Bill
Anderson, Gejji et al. (
2014
); we will discuss two
”
Several of author
'
figures from this paper in this
article after summarizing author
s perspective on dynamics as a former gas turbine
combustion technologist and product leader in the following paragraph that starts
by duplicating a statement lifted off from Mongia et al. (
2003
).
'
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