Beita, Jadeed;
Talibi, Midhat;
Rocha, Nuno;
Ezenwajiaku, Chinonso;
Sadasivuni, Suresh;
Balachandran, Ramanarayanan;
(2023)
Experimental Investigation of Combustion Instabilities in a Laboratory-Scale, Multi-Can Gas Turbine Combustor.
In:
Proceedings of the ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition.
(pp. GT2023-103206).
American Society of Mechanical Engineers: Boston, Massachusetts, USA.
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Abstract
Can and can-annular (can-type) combustors are widely employed in stationary gas turbines. While majority of combustion instability research so far has focused on single can combustors, studying combustion dynamics in multi-can configurations holds more practical relevance. In can-type combustors, the annular gap between the transition ducts and first stage nozzles, known as the ‘cross-talk’ region, promotes strong can-to-can acoustic interactions. In this study, coupled interactions between neighbouring cans are experimentally investigated in a laboratory-scale, atmospheric, two-can combustor rig. Results demonstrate that an out-of-phase longitudinal mode, characterised by pressure anti-nodes in the cans and a pressure node in the cross-talk area, is preferentially excited in the multi-can combustor. Investigation into the effects of combustor flow rate and cross-talk geometry on the can-to-can dynamics revealed an increase in the amplitude of the limit cycle oscillations with mass flow rate, cross-talk volume and cross-talk exit area reduction. However, these factors exerted a weak influence on the frequency of the oscillations and did not impact the mode shape of the resonant can-to-can mode. These findings would help better understand the complex dynamical interactions that occur in multi-can systems towards model validation and tool development, while highlighting the significance of factoring in thermoacoustic aspects in the design of the combustor-turbine interface.
| Type: | Proceedings paper |
|---|---|
| Title: | Experimental Investigation of Combustion Instabilities in a Laboratory-Scale, Multi-Can Gas Turbine Combustor |
| Event: | ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition |
| Dates: | 26 Jun 2023 - 30 Jun 2023 |
| ISBN-13: | 9780791886960 |
| DOI: | 10.1115/gt2023-103206 |
| Publisher version: | https://doi.org/10.1115/GT2023-103206 |
| Language: | English |
| Additional information: | This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gas turbines, combustion instabilities, can-tocan interaction, cross-talk |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10183971 |
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