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Numerical prediction of thermoacoustic instabilities with a V-Flame
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9061-4174
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-4103-0129
2016 (English)In: 23rd International Congress on Sound and Vibration 2016 (ICSV 23), Athens, Greece 10-14 July 2016, Volume 1 of 6: From Ancient to Modern Acoustics, International Institute of Acoustics and Vibrations , 2016, Vol. 1Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, results from a numerical solver for the Helmholtz equation using the Finite Element Method (FEM) for predicting thermoacoustic instabilities are presented. The one-dimensional n-τ flame model, which is governed by an interaction index n and a time-delay τ as well as a Flame transfer function (FTF) is used for flame source term. We show results for the validation of the numerical solver for the Rijke tube benchmark case with the variation of n and τ in the one-dimensional n-τ model. Thereafter, thermoacoustic instabilities for a V-flame are predicted, for a typical configuration of a dump combustor - a tube with an area expansion. This is a more realistic test case, since a bluff-body flame holder is often used in combustors, where a V-flame will be generated and anchored to the rod. Usually, the V-flame is more susceptible to thermoacoustic instabilities. In the paper, the eigenfrequencies, as well as the acoustic pressure perturbations are presented as numerical results.

Place, publisher, year, edition, pages
International Institute of Acoustics and Vibrations , 2016. Vol. 1
Keywords [en]
Acoustics, Combustors, Numerical methods, Thermoacoustics, Time delay, Acoustic pressures, Eigen frequencies, Flame transfer functions, Interaction index, Numerical predictions, Numerical results, Numerical solvers, Thermoacoustic instability, Finite element method
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-195437Scopus ID: 2-s2.0-84987864236ISBN: 978-1-5108-2716-5 (print)OAI: oai:DiVA.org:kth-195437DiVA, id: diva2:1050274
Conference
23rd International Congress on Sound and Vibration 2016 (ICSV 23), Athens, Greece 10-14 July 2016
Note

Funding Details: FP7-PEOPLE-ITN-2012, EC, European Commission

QC 20161128

Available from: 2016-11-28 Created: 2016-11-03 Last updated: 2019-02-28Bibliographically approved

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Authority records BETA

Na, WeiEfraimsson, GunillaBoij, Susann

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