Successful NOx measurements at the end of the primary zone of a small tubular combustor of conventional gas turbine design, employing acoustically controlled primary zone air-jet mixing processes, have been made at scaled 1/4 and 1/8 load operating conditions. Testing at 1/8 load significantly increased the effective strength of the acoustic drive, which strongly improved the mixing by the acoustically driven primary zone air-jets. The acoustic drive caused partial blockage of the combustor primary zone airflow. This increased the equivalence ratio and the gas temperature, and made the gas temperature distribution more uniform, except for lean conditions at 1/8 load, in the plane of the NOx measurements. This explained the measured greater NOx “with-drive,” and the distinctly more uniform NOx distribution, which confirmed that mixing was acoustically augmented. The acoustically produced changes were greater at 1/8 load. The acoustic drive significantly changed the combustor operating characteristic so far as mean NOx was concerned, and under lean conditions at 1/8 load mean NOx was reduced, indicating that a value of 10 ppm is possible (a 50 percent reduction).

Issue Section:
Gas Turbines: Combustion and Fuels
Topics:
Acoustics, Combustion chambers, Nitrogen oxides, Stress, Air jets, Air flow, Design, Gas turbines, Temperature, Temperature distribution, Testing
1.
Anderson
A. B. C.
,
1955
, “
Structure and Velocity of the Periodic Vortex-Ring Flow Pattern of a Primary Pfeifenton (Pipe Tone) Jet
,”
The Journal of the Acoustical Society of America
, Vol.
27
, No.
6
, pp.
1048
–
1053
.
2.
Becker
H. A.
, and
Massaro
T. A.
,
1968
, “
Vortex Evolution in a Round Jet
,”
Journal of Fluid Mechanics
, Vol.
31
, Part 3, pp.
435
–
448
.
3.
Binder, G., and Favre-Marinet, M., 1973, “Mixing Improvement in Pulsating Turbulent Jets,” ASME Symposium on Fluid Mechanics of Mixing, Georgia Institute of Technology, Atlanta, Georgia, pp. 167–172.
4.
Bremhorst
K.
, and
Harch
W. H.
,
1978
, “
The Mechanism of Jet Entrainment
,”
AIAA Journal
, Vol.
16
, No.
10
, pp.
1104
–
1105
.
5.
Clarke, A. E., Gerrard, A. J., and Holliday, L. A., 1963, “Some Experiences in Gas Turbine Combustion Chamber Practice Using Water Flow Visualisation Techniques,” Ninth Symposium (International) on Combustion, The Combustion Institute, Academic Press, pp. 878–891.
6.
Crow
S. C.
, and
Champagne
F. H.
,
1971
, “
Orderly Structure in Jet Turbulence
,”
Journal of Fluid Mechanics
, Vol.
48
, pp.
547
–
591
.
7.
Hahnemann
Von H.
, and
Ehret
L.
,
1943
, “
Uber den Einfluss Starker Schallwellen auf eine Stationar Brennende Gasflamme
,”
Zeitschrift fu¨r Technisch Physik
, Vol.
24
, pp.
228
–
242
.
8.
Heavens
S. N.
,
1980
, “
Visualisation of the Acoustic Excitation of a Subsonic Jet
,”
Journal of Fluid Mechanics
, Vol.
100
, Part 1, pp.
185
–
200
.
9.
Hill
W. G.
, and
Greene
P. R.
,
1977
, “
Increased Turbulent Jet Mixing Rates Obtained by Self-Excited Acoustic Oscillations
,”
ASME Journal of Fluids Engineering
, Vol.
99
, No.
3
, pp.
520
–
525
.
10.
Kibens
V.
,
1980
, “
Discrete Noise Spectrum Generated by an Acoustically Excited Jet
,”
AIAA Journal
, Vol.
18
, No.
4
, pp.
434
–
441
.
11.
Lefebvre, A. H., 1983a, “Ch. 4 Aerodynamics,” Gas Turbine Combustion, McGraw-Hill Series in Energy, Combustion, and Environment, New York, pp. 107–155.
12.
Lefebvre, A. H., 1983b, “Ch. 11 Emissions,” Gas Turbine Combustion, McGraw-Hill Series in Energy, Combustion, and Environment, New York, pp. 470.
13.
Lefebvre, A. H., 1983c, “Ch. 11 Emissions,” Gas Turbine Combustion, McGraw-Hill Series in Energy, Combustion, and Environment, New York, p. 485.
14.
Pearce, G. F., Kretschmer, D., Odgers, J., and Wang, G., 1993, “The Prediction of Thermal NOx in Gas Turbine Exhausts,” XI International Symposium on Air Breathing Engines, Tokyo, pp. 1–10.
15.
Ramesh, V., Vermeulen, P. J., and Munjal, M. L., 1993, “Measurement of Acoustic Power for a Tube Air Flow and Correlation With Exit Pulsation Velocity,” Proc. Inter-Noise ’93, Leuven, Belgium, Vol. II, pp. 1227–1230.
16.
Roffe, G., and Venkataramani, K. S., 1978, “Emissions Measurements for Lean Premixed Propane/Air System at Pressures up to 30 Atmospheres,” NASA CR-159421.
17.
Sarohia
V.
, and
Massier
P. F.
,
1978
, “
Experimental Results of Large-Scale Structures in Jet Flows and Their Relation to Jet Noise Production
,”
AIAA Journal
, Vol.
16
, No.
8
, pp.
831
–
835
.
18.
Vermeulen
P. J.
,
Odgers
J.
, and
Ramesh
V.
,
1982
, “
Acoustic Control of Dilution-Air Mixing in a Gas Turbine Combustor
,”
ASME JOURNAL OF ENGINEERING FOR POWER
, Vol.
104
, pp.
844
–
852
.
19.
Vermeulen
P. J.
,
Ramesh
V.
, and
Yu
Wai Keung
,
1986
, “
Measurements of Entrainment by Acoustically Pulsed Axisymmetric Air Jets
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
108
, pp.
479
–
484
.
20.
Vermeulen
P. J.
,
Odgers
J.
, and
Ramesh
V.
,
1987
, “
Full Load Operation of Gas Turbine Combustor With Acoustically Controlled Dilution-Air Mixing
,”
International Journal of Turbo and Jet Engines
, Vol.
4
, Nos.
1–2
, pp.
139
–
147
.
21.
Vermeulen
P. J.
, and
Yu
Wai Keung
,
1987
, “
An Experimental Study of the Mixing by an Acoustically Pulsed Axisymmetrical Air-Jet
,”
International Journal of Turbo and Jet Engines
, Vol.
4
, Nos.
3–4
, pp.
225
–
237
.
22.
Vermeulen
P. J.
,
Chin
Ching-Fatt
, and
Yu
Wai Keung
,
1990
, “
Mixing of an Acoustically Pulsed Air Jet with a Confined Crossflow
,”
AIAA Journal of Propulsion & Power
, Vol.
6
, No.
6
, pp.
777
–
783
.
23.
Vermeulen
P. J.
,
Rainville
P.
, and
Ramesh
V.
,
1992
a, “
Measurements of the Entrainment Coefficient of Acoustically Pulsed Axisymmetric Free Air Jets
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
114
, No.
2
, pp.
409
–
415
.
24.
Vermeulen
P. J.
,
Grabinski
P.
, and
Ramesh
V.
,
1992
b, “
Mixing of an Acoustically Excited Air Jet With a Confined Hot Crossflow
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
114
, pp.
46
–
54
.
25.
Vermeulen, P. J., Ramesh, V., Sanders, B., and Odgers, J., 1993, “Temperature and Combustion Analysis of Combustor With Acoustically Controlled Primary Zone Air-Jet Mixing,” AGARD Conference Proceedings 536, NATO. Fuels and Combustion Technology for Advanced Aircraft Engines, pp. 43–1 to 43–13.
26.
Vermeulen, P. J., Ramesh, V., Sanders, B., and Odgers, J., 1995, “Acoustic Control of Combustor Primary Zone Air-Jet Mixing,” AIAA Journal of Propulsion & Power, Vol. 11, No. 2.
27.
Zelina, J., and Ballal, D. R., 1994a, “Combustion and Emissions Studies Using a Well Stirred Reactor,” AIAA Paper No. 94-2903.
28.
Zelina, J., and Ballal, D. R., 1994b, “Combustion Studies in a Well Stirred Reactor,” AIAA Paper No. 94-0114.
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