Abstract
Combustion instability is a serious obstacle for the lean premixed combustion of gas turbines and can even cause fatal damage to the combustor and the entire system. Thus improved understanding of mechanisms of combustion instability is necessary for the design and operation of gas turbine combustors. In this study, we investigated the cause of the combustion instability in a rearward-step dump combustor with respect to the fuel flow modulation; choked fuel flow and un choked fuel flow. We observed various types of combustion instabilities with respect to the change of equivalence ratio and fuel flow conditions. The combustion instability mainly results from thermo-acoustic instability and the instability case was affected by the modulation of fuel flow. Particularly in the un choked fuel flow condition, we found that the oscillation time of combustion instability is highly related to the convection time of the fuel, which is defined as a flowing time taken from fuel inlet to the dump plane.
| Original language | English |
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| Pages | 79-82 |
| Number of pages | 4 |
| State | Published - 2005 |
| Event | 5th Asia-Pacific Conference on Combustion, ASPACC 2005 - Adelaide, SA, Australia Duration: 17 Jul 2005 → 20 Jul 2005 |
Conference
| Conference | 5th Asia-Pacific Conference on Combustion, ASPACC 2005 |
|---|---|
| Country/Territory | Australia |
| City | Adelaide, SA |
| Period | 17/07/05 → 20/07/05 |