Experimental and numerical investigation on the effect of pressure on micromix hydrogen combustion

  • The micromix (MMX) combustion concept is a DLN gas turbine combustion technology designed for high hydrogen content fuels. Multiple non-premixed miniaturized flames based on jet in cross-flow (JICF) are inherently safe against flashback and ensure a stable operation in various operative conditions. The objective of this paper is to investigate the influence of pressure on the micromix flame with focus on the flame initiation point and the NOx emissions. A numerical model based on a steady RANS approach and the Complex Chemistry model with relevant reactions of the GRI 3.0 mechanism is used to predict the reactive flow and NOx emissions at various pressure conditions. Regarding the turbulence-chemical interaction, the Laminar Flame Concept (LFC) and the Eddy Dissipation Concept (EDC) are compared. The numerical results are validated against experimental results that have been acquired at a high pressure test facility for industrial can-type gas turbine combustors with regard to flame initiation and NOx emissions. The numerical approach is adequate to predict the flame initiation point and NOx emission trends. Interestingly, the flame shifts its initiation point during the pressure increase in upstream direction, whereby the flame attachment shifts from anchoring behind a downstream located bluff body towards anchoring directly at the hydrogen jet. The LFC predicts this change and the NOx emissions more accurately than the EDC. The resulting NOx correlation regarding the pressure is similar to a non-premixed type combustion configuration.

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Metadaten
Author:Daniel Kroniger, Atsushi Horikawa, Harald FunkeORCiD, Franziska Pfäffle, Tsuyoshi Kishimoto, Koichi Okada
DOI:https://doi.org/10.1115/GT2021-58926
Parent Title (English):Conference Proceedings Turbo Expo: Power for Land, Sea and Air, Volume 3A: Combustion, Fuels, and Emissions
Publisher:ASME
Place of publication:New York, NY
Document Type:Conference Proceeding
Language:English
Year of Completion:2021
Tag:NOx emissions; combustor; gas turbine; hydrogen
Length:11 Seiten
Note:
ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, June 7–11, 2021, Virtual, Online.

Paper No: GT2021-58926, V03AT04A025
Link:https://doi.org/10.1115/GT2021-58926
Zugriffsart:bezahl
Institutes:FH Aachen / Fachbereich Luft- und Raumfahrttechnik