Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Effects of Flame Transfer Function on Modeling Results of Combustion Instabilities in a 3 Step Duct System

3단 덕트 시스템에서 화염전달함수가 연소불안정 모델링 결과에 미치는 영향

  • 홍수민 (강릉원주대학교 기계공학과) ;
  • 김대식 (강릉원주대학교 기계공학과)
  • Received : 2020.08.17
  • Accepted : 2020.09.10
  • Published : 2020.09.30
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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.

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