In this work, the application of Helmholtz resonators for damping low-frequency pulsations in gas turbine combustion chambers is discussed. We present a nonlinear model for predicting the acoustic response of resonators including the effect of purging air. Atmospheric experiments are used to validate the model, which is employed to design a resonator arrangement for damping low-frequency pulsations in an ALSTOM GT11N2 gas turbine. The predicted damper impedances are used as the boundary condition in the three-dimensional analysis of the combustion chamber. The suggested arrangement leads to a significant extension of the low-pulsation operating regime of the engine.

Issue Section:
Gas Turbines: Combustion and Fuels
Keywords:
thermoacoustics, oscillations, damping, resonators, gas turbines, combustion, flow instability
Topics:
Acoustics, Combustion chambers, Dampers, Damping, Gas turbines, Pressure, Flow (Dynamics), Resonance, Cavities, Engines, Industrial gases, Turbines, Absorption
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 by ASME
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