한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제19권4호
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  • Pages.15-23
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  • 2015
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  • 1226-6027(pISSN)
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  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
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음향 경계 조건이 가스터빈 연소기에서의 연소불안정에 미치는 영향

Effects of Acoustic Boundary Conditions on Combustion Instabilities in a Gas Turbine Combustor

  • Lim, Jaeyoung (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University) ;
  • Kim, Deasik (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University) ;
  • Kim, Seong-Ku (Space Propulsion Division, Korea Aerospace Research Institute) ;
  • Cha, Dong Jin (Department of Building and Plant Engineering, Hanbat National University)
  • 투고 : 2015.06.01
  • 심사 : 2015.07.07
  • 발행 : 2015.08.01
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초록

본 연구는 유한요소해석 기반의 Helmholtz solver인 ASCI3D를 사용하여 예혼합 가스터빈 연소기에서 연소불안정 현상과 관련된 주요 결과들을 예측하였다. 해석결과는 실험결과와 비교할 때 일반적인 불안정 특성 예측에는 성공하였으나, 불안정 구간이 나타나는 영역을 다소 과대 예측하는 경향이 발견되었다. 이를 개선하기 위한 노력으로 반사계수가 불안정 특성에 미치는 영향이 분석되었다. 결과로부터 반사계수는 불안정 특성에 큰 영향을 미치고, 정확한 예측 결과를 얻기 위해서는 정확한 음향 경계 조건의 정의가 필수적인 것으로 나타났다.

This study predicts the basic characteristics of combustion instabilities in a gas turbine lean premixed combustor using ASCI3D code which is a FEM(Finite Element Method)-based Helmholtz solver. The prediction results show the good agreement with the measured data in modeling the overall combustion instability features, however, the code is found to overpredict the unstable conditions. As one of the efforts to improve the model accuracy, the effects of acoustic boundary conditions on the instability growth rate are analyzed. As a result, it is shown that the acoustic reflection coefficient has a great impact on the instability and the prediction accuracy can be enhanced by defining the precise acoustic conditions.

키워드

참고문헌

  1. Kim, K.T., Lee, J.G., Lee, H.J., Quay, B.D. and Santavicca, D., "Characterization of Forced Flame Response of Swirl-Stabilized Turbulent Lean-Premixed Flames in a Gas Turbine Combustor," Journal of Engineering for Gas Turbines and Power, Vol. 132, No. 4, pp. 41502-41510, 2010. https://doi.org/10.1115/1.3204532
  2. Kim, K.T., Lee, J.G., Quay, B.D. and Santavicca D.A., "Spatially Distributed Flame Transfer Functions for Predicting Combustion Dynamics in Lean Premixed Gas Turbine Combustors," Combustion and Flame, Vol. 157, No. 9, pp. 1718-1730, 2010. https://doi.org/10.1016/j.combustflame.2010.04.016
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  6. Seybert, A.F. and Ross, D.f.,"Experimental Determination of Acoustic Properties using a Two-microphone Random-excitation Technique," Journal of Acoustical Society of America, Vol. 61, No. 5, pp. 1362-1370, 1977. https://doi.org/10.1121/1.381403
  7. Krebs, W., Flohr, P., Prade, B. and Hoffmann, S., "Thermoacoustic Stability Chart for High-intensity Gas Turbine Combustion Systems," Combustion Science and Technology, Vol. 174, No. 7, pp. 99-128, 2002. https://doi.org/10.1080/713713051
  8. Tran, N., Ducruix, S. and Schuller, T., "Damping Combustion Instabilities with Perforates at the Premixer Inlet of a Swirled Burner," Proceedings of the Combustion Institute, Vol. 32, No. 2, pp. 2917-2924, 2009.

피인용 문헌

  1. Combustion Instability Analysis Using Network Model in an Annular Gas Turbine Combustor vol.22, pp.3, 2018, https://doi.org/10.6108/KSPE.2018.22.3.072