Thermoacoustics of can-annular combustors

[+] Author and Article Information
Giulio Ghirardo

Ansaldo Energia Switzerland, Römerstrasse 36 Baden 5401, Switzerland

Carlo Di Giovine

Ansaldo Energia Switzerland, Römerstrasse 36 Baden 5401, Switzerland

Jonas P. Moeck

Institut für Strömungsmechanik und Technische Akustik, Technische Universität Berlin, Berlin 10623, Germany; Department of Energy and Process Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway

Mirko R. Bothien

Ansaldo Energia Switzerland, Römerstrasse 36 Baden 5401, Switzerland

1Corresponding author.

ASME doi:10.1115/1.4040743 History: Received June 22, 2018; Revised June 28, 2018


Can-annular combustors consist of a set of independent cans, connected on the upstream side to the combustor plenum, and on the downstream side to the turbine inlet, where a transition duct links the round geometry of each can with the annular segment of the turbine inlet. Each transition duct is open on the sides towards the adjacent transition ducts, so that neighbouring cans are acoustically connected through a so called cross-talk open area. This theoretical, numerical and experimental work discusses the effect that this communication has on the thermoacoustic frequencies of the combustor. We show how this communication gives rise to axial and azimuthal modes, and that these correspond to particularly synchronised states of axial thermoacoustic oscillations in each individual can. We show that these combustors typically show clusters of thermoacoustic modes with very close frequencies and that a slight loss of rotational symmetry, e.g. a different acoustic response of certain cans, can lead to mode localization. We corroborate the predictions of azimuthal modes, clusters of eigenmodes and mode localization with experimental evidence.

Copyright (c) 2018 by ASME
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