Abstract

Acoustic behavior in gas turbine combustor with acoustic resonator is investigated numerically by adopting linear acoustic analysis. Helmholtz-type resonator is employed as acoustic resonator to suppress acoustic instability passively. The tuning frequency of acoustic resonator is adjusted by varying its length. Through harmonic analysis, acoustic-pressure responses of chamber to acoustic excitation are obtained and the resonant acoustic modes are identified. Acoustic damping effect of acoustic resonator is quantified by damping factor. As the tuning frequency of acoustic resonator approaches the target frequency of the resonant mode to be suppressed. mode split from the original resonant mode to lower and upper modes appears and thereby complex patterns of acoustic responses show up. Considering mode split and damping effect as a function of tuning frequency, it is desirable to make acoustic resonator tuned to broad-band frequencies near the maximum frequency of those of the possible upper modes.

주제어

#음향공명기   #음향해석   #음향 불안정   #감쇠인자  

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참고문헌 (12)

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이 논문을 인용한 문헌 (4)

1. Kim Hong Jip ; Kim Seong-Ku 2006. "A Study on the Acoustic Damping Characteristics of Acoustic Cavities in a Liquid Rocket Combustor" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 30(1): 32~40  원문보기 상세보기
2. 2007. "" Journal of mechanical science and technology, 21(1): 153~161  원문보기 상세보기
3. 2008. "" Journal of mechanical science and technology, 22(4): 708~713  원문보기 상세보기
4. Kim, Hyeon-Jun ; Hong, Jung-Goo ; Kim, Dae-Hee ; Shin, Hyun-Dong 2008. "Numerical Simulation of Self-excited Combustion Oscillation in a Dump Combustor with Bluff-body" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 32(9): 659~668  원문보기 상세보기