City Research Online

Abstract

This study investigates the effects of swirl number and air preheating on the turbulent mixing characteristics of pure methane and hydrogen–methane fuel blends in a swirl-stabilized burner. Utilizing large eddy simulations (LES) with the Wall-Adapting Local Eddy-viscosity (WALE) sub-grid model, the turbulent flow fields are calculated and validated using non-reactive cases with varying swirl numbers. The research explores the combined impact of varying swirl numbers, preheating intake air, and hydrogen addition on flow structures and mixing behavior. This integrated approach clarifies how these factors influence flow field structures, stoichiometric volume and length, intensity of segregation, scalar dissipation rate, variance spectral density, and probability density function of mixture fraction. These insights can enhance the efficiency and cleanliness of hydrogen–methane combustion technologies. The findings offer a guidance for optimizing hydrogen–methane fuel blends, contributing to the transition towards sustainable energy sources.

Publication Type:	Article
Additional Information:	This is an open access article distributed under the terms of the Creative Commons CC-BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Publisher Keywords:	Mixing characteristics, Hydrogen blended fuel, Swirl-stabilized burner, Large Eddy simulation, Turbulent flow, OpenFOAM
Subjects:	T Technology > TJ Mechanical engineering and machinery
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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