Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Experimental Study on the Instability of Combustion in a Dump Combustor with Respect to Fuel and Air Mixing and Flow Conditions

혼합기 공급방식에 따른 덤프연소기의 연소 불안정성에 관한 실험적 연구

  • 홍정구 (한국과학기술원 대학원 기계공학과) ;
  • 이민철 (한전 전력연구원) ;
  • 이은도 (한국과학기술원 대학원 기계공학과) ;
  • 오광철 (자동차부품연구원) ;
  • 신현동 (한국과학기술원 기계공학과)
  • Published : 2005.08.01
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Abstract

The combustion instability of turbulent flames is the most important problem of the gas turbine combustor. Thus improved understanding of mechanisms of combustion instability is necessary for the design and operation of gas turbine combustors. In this study, the cause of the combustion instability in a rearward-step dump combustor was investigated with respect to the fuel flow modulation; choked fuel flow, unchoked fuel flow and fully premixed mixture flow. We observed various types of combustion instabilities with respect to the change of equivalence ratio, fuel flow conditions and fuel injection location. Particularly in the unchoked fuel flow condition, it was found that the oscillation time of combustion instability is strongly related to the convection time of the fuel and that the pressure fluctuation in a lab-scale combustor is highly related to the vortex and the equivalence ratio fluctuations due to fuel flow modulation and unmixedness of the fuel and air.

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References

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