NUMERICAL PREDICTION OF THERMOACOUSTIC INSTABILITIES WITH A V-FLAME
2016 (English)In: PROCEEDINGS OF THE 23RD INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: FROM ANCIENT TO MODERN ACOUSTICS, INT INST ACOUSTICS & VIBRATION , 2016Conference paper (Refereed)
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-tau flame model, which is governed by an interaction index n and a time-delay tau 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 tau in the one-dimensional n-tau 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
INT INST ACOUSTICS & VIBRATION , 2016.
Proceedings of the International Congress on Sound and Vibration, ISSN 2329-3675
IdentifiersURN: urn:nbn:se:kth:diva-203203ISI: 000388480402042ISBN: 978-960-99226-2-3 OAI: oai:DiVA.org:kth-203203DiVA: diva2:1081426
23rd International Congress on Sound and Vibration (ICSV), JUL 10-14, 2016, Athens, GREECE
QC 201703142017-03-142017-03-142017-03-14Bibliographically approved