Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Limit Cycle Amplitude Prediction Using Results of Flame Describing Function Modeling

화염묘사함수 모델링 결과를 이용한 한계 진폭 예측

  • Kim, Jihwan (Department of Mechanical and Automotive Engineering, Gangneung-Wonju National University) ;
  • Kim, Jinah (Department of Mechanical and Automotive Engineering, Gangneung-Wonju National University) ;
  • Kim, Daesik (Department of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
  • Received : 2016.06.06
  • Accepted : 2016.11.15
  • Published : 2016.12.01
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Abstract

It is required to predict a limit cycle amplitude controlled by system's nonlinear behavior as well as an eigen-frequency and initial growth rate of instabilities under the linear motions, in order to fully understand combustion instabilities in a lean premixed gas turbine combustor. Special focus of the current work is placed on the limit cycle amplitude prediction using flame describing function(FDF) where the ratio of a heat release fluctuation to a given flow perturbation is expressed as a function of frequency and amplitude. In this study, the CFD modeling work based on RANS is carried out to obtain FDF, which makes that the nonlinear thermo-acoustic model is successfully developed for predicting the limit cycle amplitude of the combustion instability.

희박 예혼합 가스터빈의 연소 불안정 현상을 이해하기 위해서는, 선형 과정에 의하여 얻어지는 고유주파수 및 초기 성장률뿐만 아니라, 연소기 비선형 특성에 의존하는 한계진폭의 예측이 필요하다. 특히 현재의 연구에서는 비선형 거동에 의한 한계 진폭을 예측하기 위해서 유동 섭동과 열발생의 비율이 주파수와 속도 진폭을 정의할 수 있는 화염묘사함수를 적용하였다. 본 연구에서는 화염묘사함수를 얻기 위하여 CFD 기법이 적용되었으며, 이를 통하여 비선형 열음향 해석으로부터 불안정 한계 진폭을 예측할 수 있었다.

Keywords

References

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