혼합기 공급방식에 따른 덤프연소기의 연소 불안정성에 관한 실험적 연구 An Experimental Study on the Instability of Combustion in a Dump Combustor with Respect to Fuel and Air Mixing and Flow Conditions

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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.
Publisher
대한기계학회
Issue Date
2005-08
Language
Korean
Citation

대한기계학회논문집 B, v.29, no.8, pp.963 - 970

ISSN
1226-4881
URI
http://hdl.handle.net/10203/15456
Appears in Collection
ME-Journal Papers(저널논문)
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