• Title/Summary/Keyword: Reyleigh의 기준

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Active Control of Thermoacoustic Instability in Cylindrical Combustor with Low Speed Flow Field (저속 유동장이 있는 원통형 연소기에서의 열-음향학적 불안정에 대한 능동 제어 연구)

  • 조상연;이용석;이수갑;배충식
    • Journal of KSNVE
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    • v.8 no.5
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    • pp.914-921
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    • 1998
  • Combusion instability due to thermoacoustic feedback in a ducted combustor usually excites severe noise and vibration, which could lead to result in the failure of the system or environmental dispute. In the present study, an active noise control(ANC) method with an adaptive algotithm is hired to suppress instability which has very discrete behavior in the frequency domain. Especially a feedback system is composed to evade hot environment of the combustor, and as a preliminary, the performance and stability of the controller is chekced by simulating the real situation with harmonic waves. Application to the real combustor showed serious reductions in sound pressure level by 20∼30 dB. It was also shown that the selected control system was very stable and effective.

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