Masterarbeit

Schematic of a can-annular combustor

 

Existing set-up that will be modified: the annulus will be replaced by a thin plate with openings

 

Thermoacoustic instabilities arise due to the constructive feedback between unsteady heat release fluctuations and combustor acoustics. They are strongly undesirable, as they lead to unwanted structural vibrations, thus limiting the operating range of the engine. The last generation (H-class) of gas turbines features can-annular combustor architectures. In these combustors, each flame burns in an essentially isolated manner in a can. Nonetheless, the annular turbine inlet, which is shared by all cans, couples the cans via acoustic phenomena. Detailed experimental investigations on the significance of the coupling between the cans are sparse in the literature. The few, very recent experimental observations shown that both global and localized self-sustained thermoacoustic modes can occur. An experimental investigation of the aero-acoustic coupling is the goal of this thesis.

Thesis description

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