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Direct Numerical Simulation (DNS) of non-reacting flows in a Flamesheet-like geometrical configuration

Firing of gas turbines (GTs) using hydrogen-enriched fuel mixtures and, in perspective, unblended hydrogen constitutes a low-carbon solution for power generation and enables the reduction of emissions from the Norwegian Continental Shelf.

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Presenter: Andrea Gruber, SINTEF

The main technological barrier, within the gas turbine itself, is represented by the combustion process due to the greatly enhanced reactivity of hydrogen compared with conventional hydrocarbon fuel (natural gas) that results in detrimental combustion instabilities (flashback and thermo-acoustic oscillations). Because of its unique flow-pattern design and resulting flame stabilization, Flamesheet(TM) represents today one of the most promising technologies to achieve stable, clean and efficient combustion of unblended hydrogen in a gas turbine.

The present webinar will provide background and rationale for the LowEmission/SP2 research activity around Flamesheet and describe initial findings from the first Direct Numerical Simulation (DNS) of a geometrically-complex, Flamesheet-like flow field. The DNS approach to computational fluid dynamics (CFD) exploits state-of-the-art supercomputers to provide very accurate predictions, unaffected by approximations, of non-reactive and reactive turbulent flows. In this case, DNS results provide crucial insights about the flow field that is established in a Flamesheet-like geometrical configuration and indicate guidelines for optimization and potential improvements of the combustion system design in respect to flashback resilence.

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