Title:
Identification of High-Frequency Transverse Acoustic Modes In Multi-Nozzle Can Combustors

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dc.contributor.author Kim, Jeongwon
dc.contributor.author Gillman, Wesley
dc.contributor.author Wu, David
dc.contributor.author Emerson, Benjamin
dc.contributor.author Acharya, Vishal
dc.contributor.author Mckinney, Randal
dc.contributor.author Isono, Mitsunori
dc.contributor.author Saitoh, Toshihiko
dc.contributor.author Lieuwen, Timothy C.
dc.contributor.corporatename Georgia Institute of Technology. Center for Career Discovery and Development en_US
dc.contributor.corporatename Georgia Institute of Technology. Office of Graduate Studies en_US
dc.contributor.corporatename Georgia Institute of Technology. Office of the Vice Provost for Graduate Education and Faculty Development en_US
dc.contributor.corporatename Georgia Institute of Technology. Student Government Association en_US
dc.contributor.corporatename Georgia Institute of Technology. School of Mechanical Engineering en_US
dc.date.accessioned 2020-02-03T21:43:13Z
dc.date.available 2020-02-03T21:43:13Z
dc.date.issued 2020-01
dc.description Presented at the Georgia Tech Career, Research, and Innovation Development Conference (CRIDC), January 27-28, 2020, Georgia Tech Global Learning Center, Atlanta, GA. en_US
dc.description The Career, Research, and Innovation Development Conference (CRIDC) is designed to equip on-campus and online graduate students with tools and knowledge to thrive in an ever-changing job market. en_US
dc.description.abstract High frequency thermoacoustic instabilities are problematic for lean-premixed gas turbines. Identifying which acoustic mode is being excited is important, in that it provides insight into potential mitigation measures, as well as input into mechanical stress/lifing calculations. However, the frequency spacing between modes becomes significantly narrower for high frequency instabilities in a can combustor. This makes it difficult to distinguish between the modes (e.g., the first transverse mode vs. a higher order axial/mixed mode) based upon frequency calculations alone, which inevitably have uncertainties in boundary conditions, temperature profiles, and combustion response. This paper presents a methodology to simultaneously identify the acoustic mode shapes in the axial and azimuthal directions from acoustic pressure measurements. Multiple high temperature pressure transducers, located at distinct axial and azimuthal positions, are flush mounted in the combustor wall. The measured pressure oscillations from each sensor are then used to reconstruct the pressure distributions by using a least squares method in conjunction with a solution of a three dimensional wave equation. In order to validate the methodology, finite element method (FEM) with estimated post-flame temperature is used to provide the candidate frequencies and corresponding mode shapes. The results demonstrate the reconstructed mode shapes and standing/spinning character of transverse waves, as well as the associated frequencies, both of which are consistent with the FEM predictions. Nodal line location was also extracted from the experimental data during the instabilities in the pressure data. It was found that the line was wandering at fixed location for one mode, whereas the line was rotating in one direction for the other mode. This paper details these experimental measurements and analysis methodologies for high frequency modal identification in self-excited can combustors. en_US
dc.identifier.uri http://hdl.handle.net/1853/62414
dc.language.iso en_US en_US
dc.publisher Georgia Institute of Technology en_US
dc.relation.ispartofseries CRIDC
dc.subject Combustion en_US
dc.subject Gas turbine en_US
dc.subject Thermoacoustic en_US
dc.title Identification of High-Frequency Transverse Acoustic Modes In Multi-Nozzle Can Combustors en_US
dc.type Text
dc.type.genre Poster
dspace.entity.type Publication
local.contributor.author Lieuwen, Timothy C.
local.contributor.corporatename Office of Graduate Education
local.relation.ispartofseries Career, Research, and Innovation Development Conference
relation.isAuthorOfPublication b612098b-d0e6-4ea2-a8d5-92d6d02fe6c4
relation.isOrgUnitOfPublication d9390dfc-6e95-4e95-b14b-d1812f375040
relation.isSeriesOfPublication 4976ff66-25a7-4118-9c75-a356abde9732
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