Mixed acoustic–entropy combustion instabilities in gas turbines

Mixed acoustic-entropy combustion instabilities in gas turbines

A combustion instability in a combustor terminated by a nozzle is analysed and modelled based on a low order Helmholtz solver. A Large Eddy Simulation (LES) of the corresponding turbulent, compressible and reacting flow is first performed and analysed based on Dynamic Mode Decomposition (DMD). The mode with the highest amplitude shares the same frequency of oscillation as the experiment (approx...

Active Control of Combustion Instabilities in Low Nox Gas Turbines

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Massively parallel LES of azimuthal thermo- acoustic instabilities in annular gas turbines

Most of the energy produced worldwide comes from the combustion of fossil fuels. In the context of global climate changes and dramatically decreasing resources, there is a critical need for optimizing the process of burning, especially in the field of gas turbines. Unfortunately, new designs for efficient combustion are prone to destructive thermo-acoustic instabilities. Large Eddy Simulation (...

Co2 Abatement by the Combustion of H2-rich Fuels in Gas Turbines

As a response to the threat of global climate change, a number of technologies have been proposed in which the carbon dioxide produced by combustion of fossil fuels at power stations is captured and stored. A leading option is based on the pre-combustion decarbonisation of fossil fuels to produce hydrogen-rich fuel gases. Such decarbonisation processes integrate the production of a synthesis ga...

A Review of Previous Studies of Oscillatory Combustion in Gas Turbines: