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Numerical prediction of thermoacoustic instabilities with a V-Flame

By Wei Na, Gunilla Efraimsson and Susann Boij

Abstract

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.Funding Details: FP7-PEOPLE-ITN-2012, EC, European CommissionQC 20161128</p

Topics: 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, Fluid Mechanics and Acoustics, Strömningsmekanik och akustik
Publisher: International Institute of Acoustics and Vibrations
Year: 2016
OAI identifier: oai:DiVA.org:kth-195437
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