ResearchProject Area A
Subproject A4

Combustion Chamber Defects (finished 2017)

The aim of subproject A4 is the localization of a defect in the combustion chamber in an aircraft engine by an association between combustor errors and measured texture of the exhaust jet. Damages at the aircraft engine could be detected with appropriate exhaust jet diagnostics and allows an evaluation of the state of the engine without disassembly.

MOTIVATION AND OBJECTIVES

Model combustion chamber for investigations of the influence of defects

Defects in combustion chambers of aircraft engines might reduce the performance and represents an increase stress of the turbine. An exhaust jet analysis informs earlier decisions about the time and extent of the regeneration process and can help to extend the maintenance cycle. The subprojects A3 and A4 cooperate to achieve this aim. While the influences of turbine defects on the exhaust jet are investigated in subproject A3, subproject A4 focuses on the defects in the combustion chamber and their effects. For the detection of combustor defects, species concentration and emission measurement techniques will be used, which allows a comprehensive analysis of the engine and the current operating condition.

RESULTS

In the first funding period of the project, the feasibility and function of an exhaust gas analysis was initially demonstrated. For experimental purposes, two experimental combustion chambers were developed and put into operation. Extensive experimental investigations concerning the reference and different failure cases have been carried out. Numerical studies have already been done on real aircraft engines and the model combustion chamber to simulate the flow and reactive processes with CFD. The simulated data from the calculations were successfully validated with measurements of flow velocity and emissions within the combustion chamber. For both, numerical simulations were performed for the reference and failure cases.

Operation of the model combustion chamber with a faulty fuel supply

CURRENT RESEARCH AND OUTLOOK

For the next steps, it is necessary to quantify the turbulent mixing of defect signatures in combustion chambers. The mixing reduces the information content about the position of the defect and the influence on the exhaust jet behind the engine. This limits the applicability of the defect detection with the methodology of the exhaust jet analysis. The mixing of defect signatures occurs through diffusive processes that blur temperature and gas concentration patterns. The complex diffusion is one possible approach and will be further investigated in subproject A6 with the experience gained in project A4.

Simulated CO distribution at the combustor outlet for a faulty burner operation

PUBLICATIONS

International Scientific Journal Paper, peer-reviewed

  • Hartmann, U.; Hennecke, C.; Dinkelacker, F.; Seume, J. R. (2016): Automatic Detection of Defects in a Swirl Burner Array Through an Exhaust Jet Pattern AnalysisIn: J. Eng. Gas Turbines Power 139 (3)
    DOI: 10.1115/1.4034449

International Conference Paper, peer-reviewed

  • Hartmann, U.; Hennecke, C.; Dinkelacker, F.; Seume, J. R. (2016): Automatic Detection of Defects in an Annular Swirl Burner Array Through an Exhaust Jet Pattern AnalysisProceedings of the ASME Turbo Expo 2016, S. 1–10
  • von der Haar, Henrik; Hartmann, U.; Hennecke, C.; Dinkelacker, F.; Seume, J. R. (2016): Early Defect Detection on an annular Swirl-Burner-Array by Optical Measuring Exhaust Gases and Numerical AnalysisIn: Proceedings of the ASME Turbo Expo 2016, June 13-17, 2016, Seoul, South Korea
  • Adamczuk, R.; Buske, C.; Roehle, I.; Hennecke, C.; Dinkelacker, F.; Seume, J. R. (2013): Impact of Defects and Damage in Aircraft Engines on the Exhaust JetProceedings of the ASME Turbo Expo, 3-7 June 2013, San Antonio, USA, GT2013-95709

International Conference Paper, not peer-reviewed

  • Hartmann, U.; Haar, H. von der; Dinkelacker, F.; Seume, J. (2018): Experimental Defect Detection in a Swirl-Burner Array Through Exhaust Jet Analysis2018 AIAA Aerospace Sciences Meeting, AIAA SciTech Forum, 8-12 January 2018, Kissimmee, Florida, USA, AIAA2018-0303
    DOI: 10.2514/6.2018-0303
  • Haar, H. von der; Hennecke, C.;. Dinkelacker, F. (2017): Approach of Future Defect Detection in Aircraft Engines by Optical Measuring Exhaust GasesCombustion Institute (Hg.): Proceedings of the 8th European Combustion Meeting
  • Hauptmann, T.; Aschenbruck, J.; Christ, P.; Hennecke, C.; Dinkelacker, F.; Seume, J. R. (2015): Influence of Combustion Chamber Defects on the Forced Response Behavior of Turbine Blades. Proceedings of the 14th International Symposium on Unsteady Aerodynamics, Aeroacoustics & Aeroelasticity of Turbomachines, ISUAAAT14, 8-11 September 2015, Stockholm, Schweden, S. 9
  • Hennecke, C.; Frieling, D.; Dinkelacker, F. (2013): Influence of Combustion Chamber Disturbances to Patterns in the Hot Gas PathEuropean Combustion Meeting 2013

National Conference Paper, not peer-reviewed

  • Hennecke, C.; Hartmann, U.; von der Haar, Henrik; Dinkelacker, F.; Seume, J. R. (2015): Fehlerfrüherkennung von Brennkammerdefekten einer Ringbrennkammer aus einem 8-Drallbrenner-Array mittels optischer Abgasstrahlanalyse und numerischer Zuordnung27. Deutscher Flammentag Verbrennung und Feuerung, Düsseldorf: VDI-Verlag, S. 393–402
  • Hennecke, C.; Hartmann, U.; von der Haar, Henrik; Dinkelacker, F.; Seume, J. R. (2015): Correlation of Defects in an Annular Swirl-Burner-Array by Optical Measuring Exhaust Gases and Numerical Analysis64. Deutscher Luft- und Raumfahrtkongress 2015, 22-24 September 2015, Rostock
  • Hennecke, C.; Maronna, T.; Dinkelacker, F. (2013): Detektion von Triebwerksbrennkammerfehlern durch Analyse von Temperatur- und Speziesprofilen der Heißgase einer Modell-BrennkammerDeutscher Flammentag 2013
All publications of the Collaborative Research Centre

SUBPROJECT LEADER

Prof. Dr. Friedrich Dinkelacker
Address
An der Universität 1, Gebäude 8141
30823 Garbsen
Address
An der Universität 1, Gebäude 8141
30823 Garbsen