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FDF-based combustion instability analysis for evolution of mode shapes and eigenfrequency in the multiple flame burner

Title
FDF-based combustion instability analysis for evolution of mode shapes and eigenfrequency in the multiple flame burner
Author
김용모
Keywords
Thermoacoustic instability; Flame describing function; Helmholtz solver; Perforated plate; Premixed flame; Mode transformation
Issue Date
2017-06
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
APPLIED THERMAL ENGINEERING, v. 124, page. 695-706
Abstract
In this work, the FDF (flame describing function)-based combustion instability analysis together with the Helmholtz solver has been made for the wide range of velocity perturbation and plenum length in the multiple premixed burner. The Helmholtz solver is based on the commercial software COMSOL and the present numerical analysis is made for the two-dimensional axisymmetric geometry. This study has been mainly motivated to systematically analyze the effects of the velocity perturbation on the detailed evolution of eigenfrequency and mode transformation characteristics versus the variation of the plenum length. Due to the realistic treatment for the acoustic boundary conditions as well as the pressure jump condition across the perforated plate, the present study is able to predict the continuous transformation of the mode shapes according to the variation of the plenum length. To precisely analyze the nonlinear combustion instability phenomena in the multiple flame combustor, computations are made for the wide range of velocity perturbation and plenum length. In terms of stable and unstable ranges of frequency, numerical results yield the comparable results with measurements. Moreover, the present numerical results for the higher velocity perturbation ratios clearly reveal the frequency locking phenomenon which does not change the eigenfrequency even for the condition transforming the acoustic modes several times. Based on numerical results, the detailed discussions are made for effects of the velocity perturbation on the evolution of eigenfrequency and mode transformation characteristics versus the variation of the plenum length. (C) 2017 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S1359431116332380?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/114431
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2017.06.084
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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