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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Characterization of Lean Burn Module Air Blast Pilot Injector With Laser Techniques

[+] Author and Article Information
U. Meier

e-mail: ulrich.meier@dlr.de

C. Hassa

DLR - German Aerospace Center,
Institute of Propulsion Technology,
Linder Hoehe,
Cologne D-51147, Germany

W. Lazik

Rolls-Royce Deutschland Ltd & Co
KG, Eschenweg 11, Dahlewitz,
Blankenfelde-Mahlow 15827, Germany

M. Whiteman

Rolls-Royce plc,
Derby DE24 8BJ, UK

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 16, 2013; final manuscript received July 24, 2013; published online September 23, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(12), 121508 (Sep 23, 2013) (7 pages) Paper No: GTP-13-1264; doi: 10.1115/1.4025148 History: Received July 16, 2013; Revised July 24, 2013

For lean burn combustor development in low emission aero-engines, the pilot stage of the fuel injector plays a key role with respect to stability, operability, NOx emissions, and smoke production. Therefore it is of considerable interest to characterize the pilot module in terms of pilot zone mixing, fuel placement, flow field, and interaction with the main stage. This contribution focuses on the investigation of soot formation during pilot-only operation. Optical test methods were applied in an optically accessible single sector rig at engine idle conditions. Using planar laser-induced incandescence (LII), the distribution of soot and its dependence on air/fuel ratio, as well as geometric injector parameters, was studied. The data shows that below a certain air/fuel ratio, an increase of soot production occurs. This is in agreement with smoke number measurements in a standard single sector flame tube rig without optical access. Reaction zones were identified using chemiluminescence of OH radicals. In addition, the injector flow field was investigated with PIV. A hypothesis regarding the mechanism of pilot smoke formation was made based on these findings. This along with further investigations will form the basis for developing strategies for smoke improvement at elevated pilot-only conditions.

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References

Lazik, W., Doerr, Th., Bake, S. v. d., Bank, R., and Rackwitz, L., 2008, “Development of Lean-Burn Low-NOx Combustion Technology at Rolls-Royce Deutschland,”ASME Paper No. GT2008-51115 [CrossRef].
Jander, H., and Wagner, H. G., 2005, “Formation of Flame Ions, Cluster, Nanotubes and Soot in Hydrocarbon Flames,” Proceedings of 5th International Seminar on Flame Structure, Novosibirsk, Russia, July 11–14.
Douce, F., Djebaïli-Chaumeix, N., Paillard, C., Clinard, C., and Rouzaud, J. N., 2000, “Soot Formation From Heavy Hydrocarbons Behind Reflected Shock Waves,” Symp. (Int.) Combust., 28(2), pp. 2523–2529.
Joo, H. I., and Gülder, Ö. L., 2010, “Soot Formation and Temperature Structure in Small Methane–Oxygen Diffusion Flames at Subcritical and Supercritical Pressures,” Combust. Flame, 157, pp. 1194–1201. [CrossRef]
Yang, P., and Seitzman, J. M., 2003, “Soot Concentration and Velocity Measurement in an Acoustic Burner,” AIAA Paper No. 2003-1014. [CrossRef]
Kock, B. F., Tribalet, B., Schulz, C., and Roth, P., 2006, “Two-Color Time-Resolved LII Applied to Soot Particle Sizing in the Cylinder of a Diesel Engine,” Combust. Flame, 147, pp. 79–92. [CrossRef]
Crua, C., Evans, J. C., Kennaird, D. A., and Heikal, M. R., 2003, “In-Cylinder Study of the Formation, Autoignition and Soot Production of Diesel Sprays at Elevated Pressures,” 9th International Conference on Liquid Atomization and Spray Systems (ICLASS) Sorrento, Italy, July 13–17.
Hertler, D., Stirn, R., Arndt, S., Grzeszik, R., and Dreizler, A, 2011, “Investigations of Soot Formation in an Optically Accessible Gasoline Direct Injection Engine by Means of Laser-Induced Incandescence (LII),” Appl. Phys. B Lasers Opt., 104(2), pp. 399–407. [CrossRef]
Gord, J. R., Meyer, T. R., Roy, S., and Gogineni, S. P., 2004, “Studies of Hydroxyl Distribution and Soot Formation in Turbulent Spray Flames,” 12th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, July 12–15.
Geigle, K. P., Zerbs, J., and Guin, C., 2010, “Laser-Induced Incandescence for Soot Measurements in Technical Flames at Increased Pressure at the ONERA M1 Test Rig,” Proceedings Deutscher Luft- und Raumfahrtkongress, Hamburg, Germany, August 31–September 2.
Meier, U., Heinze, J., Lange, L., Hassa, C., Rackwitz, L., and Doerr, T., 2012, “Characterisation of the Combustion Performance of Low Emission Fuel Injectors With Laser Measurements,” CEAS Aeronaut. J., 3, pp. 45–53. [CrossRef]
Schneider, D., Meier, U., Quade, W., Koopman, J., Aumeier, T., Langfeld, A., Behrendt, T., Hassa, C., and Rackwitz, L., 2010, “A New Test Rig for Laser Optical Investigations of Lean Jet Engine Burners,” 27th International Congress of the Aeronautical Sciences (ICAS 2010), Nice, France, September 19–24.
“High Pressure Combustor Test Rig 1 (HBK-1) and Test Section BOSS,” 2013, DLR Institute of Propulsion Technology, Köln, Germany, http://www.dlr.de/at/desktopdefault.aspx/tabid-1509/2443_read-3809/
“Optical Smoke Meter (OSM),” 2013, Rotadata, Derby, UK, http://www.rotadata.com/pages/products/Optical-Smoke-Meter-OSM.php
Behrendt, T., Frodermann, M., Hassa, C., Heinze, J., Lehmann, B., and StursbergK., 1998, “Optical Measurements of Spray Combustion in a Single Sector Combustor From a Practical Fuel Injector at Higher Pressures,” RTO Applied Vehicle Technology Panel, Symposium on Gas Turbine Engine Combustion, Emissions and Alternative Fuels, Lisbon, Portugal, October 12–16.
Kohse-Höinghaus, K., and Jeffries, J. B., eds., 2002, Applied Combustion Diagnostics, Taylor & Francis, London.
Hoffmann, M., Besseler, W. G., Schulz, C., and Jander, H., 2003, “Laser-Induced Incandescence for Soot Diagnostics at High Pressures,” Appl. Opt., 42, pp. 2052–2082. [CrossRef] [PubMed]
Willert, C., and Jarius, M., 2002, “Planar Flow Field Measurements in Atmospheric and Pressurized Combustion Chambers,” Exp. Fluids, 33(6), pp. 931–939. [CrossRef]
Müller, A., and Wittig, S, 1994, “Experimental Study of the Influence of Pressure on Soot Formation in a Shock Tube,” Soot Formation in Combustion (Springer Series in Chemical Physics), H.Bockhorn, ed., Springer, Berlin, pp. 350–370.
Kellerer, H., Koch, R., and Wittig, S., 2000, “Measurements of the Growth and Coagulation of Soot Particles in a High-Pressure Shock Tube,” Combust. Flame, 120(1–2), pp. 188–199. [CrossRef]

Figures

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Fig. 1

Rolls Royce LDI fuel injector with concentric arrangement; pilot injector at center. a: main fuel flow; b: pilot fuel flow; c: pilot air flow; d: main air flow. Left: schematics; right: operation in BOSS rig.

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Fig. 2

Schematics of test rig

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Fig. 3

Test section BOSS during operation and schematic

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Fig. 4

Abel-transformed OH chemiluminescence image for test point 4 in Fig. 5

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Fig. 5

Smoke number measured by OSM as function of module FAR for injector A. Solid symbols indicate test conditions shown in Fig. 6.

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Fig. 6

Soot volume fraction distributions for test points shown in Fig. 5

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Fig. 7

Isothermal (left) and reacting flow field (right) of injector A. Top: axial velocity, bottom: radial velocity. Discussion see text.

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Fig. 8

Reaction zones from OH chemiluminescence (gray scale) and velocity field for injector A

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Fig. 9

Flow fields at idle condition for injector A (right half) and B (left half)

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Fig. 10

Reaction regions from Abel-transformed OH chemiluminescence for injector A (right) and B (left)

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Fig. 11

Soot distribution for injector A (right) and B (left) at lean conditions (point 1 in Fig. 5). Contour lines show heat release regions.

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Fig. 12

Soot distribution for injector A (right) and B (left) at rich conditions (point 3 in Fig. 5). Contour lines show heat release regions.

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Fig. 13

Velocity field and soot distribution (gray scale) for injectors A and B at rich conditions (point 3 in Fig. 5). Thick black contour lines show heat release regions.

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