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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 허강열
- 발행연도
- 2014
- 저작권
- 포항공과대학교 논문은 저작권에 의해 보호받습니다.
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One of the major problems of design and operating industrial furnace is the vibration problem due to thermoacoustic instabilities and flow instabilities. This study analyze these instabilities in industrial oil burner and furnace using computational fluid dynamics. Further, this study predicts shear layer oscillation frequency which is suspected of the excitation source. In terms of analysis of thermoacoustic instabilities, the Rayleigh criterion is applided to predict instabilities in single burner. The Flame Transfer Function(FTF) illustrated by the ''n-tau'' model is obtained by LES(Large-Eddy Simulation) of single burner. Steady state solutions data coming from RANS(Reynolds-averaged Navier-Stokes) simulation of the furnace are applied to eigenfrequency/eigenmode analysis. The result from the analysis shows good agreement compared with the furnace resonance problem case.
목차
I. Introduction ...........................................................1II. Theories and Formulations.....................................52.1 Analysis of Thermoacoustic Instabilities.................52.1.1 Definition and Formulation ofFlame Transfer Function....................................52.1.2 Rayleigh Criterion ............................................122.2 Analysis of Flow Instability ..................................132.3 Analysis ofEigenfrequency/Eigenmode ................................17III. LES and RANS Simulation ...................................193.1 LES of Single Burner...........................................193.1.1 Case Description.............................................193.1.2 Results of LES.................................................213.2 RANS of Industrial Furnace..................................293.2.1 Case Description.............................................293.2.2 Result of RANS................................................30IV. Analysis of Thermoacoustic Instabilities................374.1 Flame Transfer Function.....................................374.2 Rayleigh Criterion...............................................39V. Analysis of Flow Instability...................................42VI. Analysis ofEigenfrequency/Eigenmode.................................56VII. Conclusion.......................................................71REFERENCES........................................................75
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