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research-article

Effects of nonlinear modal interactions on the thermoacoustic stability of annular combustors

[+] Author and Article Information
Alessandro Orchini

Institut für Strömungsmechanik und Technische Akustik Technische Universität Berlin 10623, Berlin, Germany
a.orchini@campus.tu-berlin.de

Georg A. Mensah

Institut für Strömungsmechanik und Technische Akustik Technische Universität Berlin 10623, Berlin, Germany
georg.a.mensah@tu-berlin.de

Jonas P. Moeck

Institut für Strömungsmechanik und Technische Akustik Technische Universität Berlin 10623, Berlin, GermanyDepartment of Energy and Process Engineering Norwegian University of Science and Technology 7491 Trondheim, Norway
jonas.moeck@pi.tu-berlin.de

1Corresponding author.

ASME doi:10.1115/1.4040768 History: Received June 26, 2018; Revised June 29, 2018

Abstract

In this theoretical and numerical analysis, a low-order network model is used to investigate a thermoacoustic system with discrete rotational symmetry. Its geometry resembles that of the MICCA combustor; the FDF employed in the analysis is that of a single-burner configuration, and is taken from experimental data reported in the literature. We show how most of the dynamical features observed in the MICCA experiment, including the so-called slanted mode, can be predicted within this framework, when the interaction between a longitudinal and an azimuthal thermoacoustic mode is considered. We show how these solutions relate to the symmetries contained in the equations that model the system. We also discuss how considering situations in which two modes are linearly unstable compromises the applicability of stability criteria available in the literature.

Copyright (c) 2018 by ASME
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