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http://dx.doi.org/10.15435/JILASSKR.2020.25.3.119

Effects of Flame Transfer Function on Modeling Results of Combustion Instabilities in a 3 Step Duct System  

Hong, Sumin (강릉원주대학교 기계공학과)
Kim, Daesik (강릉원주대학교 기계공학과)
Publication Information
Journal of ILASS-Korea / v.25, no.3, 2020 , pp. 119-125 More about this Journal
Abstract
In this paper, we used Helmholtz solver based on 3D finite element method to quantitatively analyze the effects of change of gain, time delay and time delay spread, which are the main variables of flame transfer function, on combustion instability in gas turbine combustor. The effects of the variable of flame transfer function on the frequency and growth rate, which are the main results of combustion instability, were analyzed by applying the conventional heat release fluctuation model and modified one considering the time spread. The analysis results showed that the change of gain and time delay in the same resonance mode affected the frequency of the given resonance modes as well as growth rate of the feedback instability, however, the effect of time delay spread was not relatively remarkable, compared with the dominant effect of time delay.
Keywords
Combustion instability; Finite element method; Thermo-acoustic analysis; Flame transfer function;
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Times Cited By KSCI : 2  (Citation Analysis)
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