dc.contributor.author | Zettervall, Niklas | |
dc.contributor.author | Worth, Nicholas | |
dc.contributor.author | Mazur, Marek | |
dc.contributor.author | Dawson, James | |
dc.contributor.author | Fureby, Christer | |
dc.date.accessioned | 2019-02-15T14:32:24Z | |
dc.date.available | 2019-02-15T14:32:24Z | |
dc.date.created | 2018-10-30T11:10:01Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Proceedings of the Combustion Institute. 2018, . | nb_NO |
dc.identifier.issn | 1540-7489 | |
dc.identifier.uri | http://hdl.handle.net/11250/2585765 | |
dc.description.abstract | Combustion instabilities are one of the major challenges in developing and operating propulsion and power generating gas-turbine engines. More specifically, techniques for managing the increasingly stringent emissions regulations and efficiency demands have often given rise to thermo-acoustic instabilities, particularly for annular combustors operating in a lean premixed mode. In this paper, we combine experimental and computational methods to examine unsteady gas turbine combustion in a full annular model gas turbine combustor installed at NTNU, operating both methane- and ethylene-air blends. The experimental data consists of flame images, high-speed OH* chemiluminescence images, as well as pressure and heat-release time-series at discrete locations for the ethylene-air case. The computational set-up consists of the 18 inlet tubes and swirlers, and the full annular combustor placed in a large external domain. The computational model consists of a compressible finite rate chemistry LES model using skeletal methane-air and ethylene-air combustion chemistry. The combustor is simulated in its self-excited state, without external forcing. From the experiments and simulations the methane and ethylene cases are found to behave differently: The ethylene-air flames are much smaller than the methane-air flames, resulting in different interaction between adjacent flames. The LES predictions show good qualitative agreement with the measurements in terms of instantaneous and time-averaged flame structure. Comparing measured and predicted time-series of pressure and heat-release also shows good quantitative agreement with respect to the dynamics and structure for the ethylene-air case. Investigating the predicted combustion dynamics using Proper Orthogonal Decomposition (POD) confirms the importance of the self-excited azimuthal mode on the behavior of the flame: the presence of nodes and anti-nodes of pressure induced fluctuations of the swirler mass-flow, which then, in turn, influence the heat-release. These events occur shifted in time. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Elsevier | nb_NO |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no | * |
dc.title | Large eddy simulation of CH4-air and C2H4-air combustion in a model annular gas turbine combustor | nb_NO |
dc.title.alternative | Large eddy simulation of CH4-air and C2H4-air combustion in a model annular gas turbine combustor | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | acceptedVersion | nb_NO |
dc.source.pagenumber | 9 | nb_NO |
dc.source.journal | Proceedings of the Combustion Institute | nb_NO |
dc.identifier.doi | 10.1016/j.proci.2018.06.021 | |
dc.identifier.cristin | 1624839 | |
dc.description.localcode | © 2018. This is the authors’ accepted and refereed manuscript to the article. Locked until 31.8.2020 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | nb_NO |
cristin.unitcode | 194,64,25,0 | |
cristin.unitname | Institutt for energi- og prosessteknikk | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 2 | |