DNS of ignition and flame stabilization in a simplified gas turbine premixer

Vabre, M.; Li, Z.; Jella, S.; Versailles, P.; Bourque, G.; Day, M.; Savard, B.

doi:10.1016/j.proci.2024.105701

DNS of ignition and flame stabilization in a simplified gas turbine premixer

Journal Article · Thu Aug 22 00:00:00 EDT 2024 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2024.105701· OSTI ID:2438459

Vabre, M.; Li, Z.; Jella, S.; Versailles, P.; Bourque, G.; ; Savard, B.

With the increasing need for fuel flexibility, mitigation of auto-ignition (AI) inside gas turbine (GT) premixers becomes crucial. They must be designed to yield a sufficiently homogeneous fuel-air mixture to achieve low emissions while at the same time avoiding the occurrence of AI and subsequent flame stabilization. This challenge requires a detailed understanding of turbulent mixing and chemistry interactions. In the present work, a direct numerical simulation (DNS) of an array of jets in crossflow (JICF), representative of an industrial GT premixer, is reported to shed light on these complex phenomena. It is found that AI kernels form in the aft part of the premixer and coalesce into a flame front that then propagates upstream, mainly through the boundary layer, and successively engulfs the jets. This, therefore, suggests a significant role of the jet array pattern on the flame stabilization. It is noted that AI kernels continue to form independently during the whole time of the simulation. To clarify the contribution of AI and diffusion in the ignition kernels and the main flame, chemical explosive mode analysis (CEMA) is employed jointly with a kernel tracking algorithm. It is found that during the initial formation of the flame, many ignition kernels form in mixtures with low scalar dissipation rate and large contribution from AI mode. As they quickly grow, they merge into a single flame front that becomes increasingly more diffusion-assisted over time, balancing the AI mode. Turbulence is shown to have a significant enhancing effect in lean premixed flames, but further analysis is required to fully characterize it. These findings are relevant for the industrial premixer studied, and also for novel micromix concepts that may be used in the next generation of GT combustion systems.

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: National Sciences and Engineering Research Council of Canada

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 2438459

Report Number(s):: NREL/JA-2C00-88258; MainId:89033; UUID:c565eaf3-2d5c-48e1-bcc8-f8c0c2e175cc; MainAdminId:73490

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 1-4 Vol. 40

Country of Publication:: United States

Language:: English

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ADVANCED PROPULSION SYSTEMS
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