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http://dx.doi.org/10.15435/JILASSKR.2021.26.4.182

Analysis of Combustion Instabilities in a 2-stage Duct System using Transfer Functions  

Kim, Seonyeong (강릉원주대학교 기계공학과)
Kim, Daesik (강릉원주대학교 기계공학과)
Publication Information
Journal of ILASS-Korea / v.26, no.4, 2021 , pp. 182-188 More about this Journal
Abstract
In this paper, using a transfer function-based analytical model, major factors influencing the acoustics and combustion instability in a two-stage duct system composed of a nozzle and a combustor were derived and their quantitative effects were evaluated. From the acoustic analysis, it was confirmed that the change in reflection coefficient and mean flow could have a great influence on the instability growth rate, and the area ratio and speed of sound ratio between the nozzle and the combustor are also key parameters to determine combustion instability as well as flame transfer functions.
Keywords
Combustion instability; Acoustic transfer function; Flame transfer function; Closed-loop system;
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