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Numerical prediction of thermoacoustic instabilities with a V-Flame
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0002-9061-4174
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0003-4103-0129
2016 (engelsk)Inngår i: 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. 1Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
International Institute of Acoustics and Vibrations , 2016. Vol. 1
Emneord [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
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-195437Scopus ID: 2-s2.0-84987864236ISBN: 978-1-5108-2716-5 (tryckt)OAI: oai:DiVA.org:kth-195437DiVA, id: diva2:1050274
Konferanse
23rd International Congress on Sound and Vibration 2016 (ICSV 23), Athens, Greece 10-14 July 2016
Merknad

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

QC 20161128

Tilgjengelig fra: 2016-11-28 Laget: 2016-11-03 Sist oppdatert: 2019-02-28bibliografisk kontrollert

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Na, WeiEfraimsson, GunillaBoij, Susann

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