In early design phases new burner concepts are mostly tested in single or multi burner test rigs. These test rigs generally exhibit a different acoustic behavior than the full scale engine. The acoustic behavior, however, is crucial to predict whether thermoacoustic instabilities are likely to occur. Tuning the test rig’s acoustic boundary conditions to that of the engine could overcome this issue. Through this, an effective assessment of new burners is possible even in early design phases. In this work a method is proposed, which uses an active control scheme to manipulate the acoustic boundary conditions. It is applied to an atmospheric combustor test rig with a swirl-stabilized burner. In a first step it is shown that the acoustic boundary conditions can be controlled in the cold flow case. Almost arbitrary frequency dependent impedances can be prescribed ranging from fully reflecting (both pressure and velocity node) to anechoic. In particular, an additional virtual length can be added to the combustor outlet by manipulation of the reflection coefficient’s phase. This introduces resonance frequencies different from those of the uncontrolled case. In a second step the impedance tuning concept is applied to the reacting flow. It is demonstrated that the concept is feasible despite the harsh environmental conditions in a combustion chamber. The effect of different levels of reflection at the combustion chamber outlet on the combustion process is investigated. In addition to that, a study of the influence of the simulated combustor length on the system’s resonance frequencies is conducted.
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ASME Turbo Expo 2007: Power for Land, Sea, and Air
May 14–17, 2007
Montreal, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4791-8
PROCEEDINGS PAPER
Impedance Tuning of a Premixed Combustor Using Active Control
Mirko R. Bothien,
Mirko R. Bothien
Technical University Berlin, Berlin, Germany
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Jonas P. Moeck,
Jonas P. Moeck
Technical University Berlin, Berlin, Germany
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Christian Oliver Paschereit
Christian Oliver Paschereit
Technical University Berlin, Berlin, Germany
Search for other works by this author on:
Mirko R. Bothien
Technical University Berlin, Berlin, Germany
Jonas P. Moeck
Technical University Berlin, Berlin, Germany
Christian Oliver Paschereit
Technical University Berlin, Berlin, Germany
Paper No:
GT2007-27796, pp. 607-617; 11 pages
Published Online:
March 10, 2009
Citation
Bothien, MR, Moeck, JP, & Paschereit, CO. "Impedance Tuning of a Premixed Combustor Using Active Control." Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air. Volume 2: Turbo Expo 2007. Montreal, Canada. May 14–17, 2007. pp. 607-617. ASME. https://doi.org/10.1115/GT2007-27796
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