Autors: Sahami M., Terziev, A. K., Pitchurov G., Ivanov, M. P., Marinov, P. A.
Title: Miscibility of CH4 and H2 gases in a premixing tube for fuel enrichment
Keywords: combustion, computational fluid dynamics, fuel enrichment, hydrogen, Tube mixing

Abstract: This study introduces a novel approach for the hydrogen-enrichment of methane fuel. A simple mixing tube, 1 m in length and 0.1 m in diameter, featuring separate hydrogen and methane jets (5 mm each), creates the desired fuel mixture for injection into a combustion chamber. The design prevents the formation of pure hydrogen regions, thereby eliminating high-temperature spots within combustors, which cause device damage and nitrous oxide formation. ANSYS Fluent 19.1 was used for numerical simulation of the tube mixing based on the species transport model. The parametric study of various jet inlet concentrations and flow rate of hydrogen shows that a simple tube, thanks to hydrogen's high diffusivity and jet turbulence, achieves complete and uniform mixing at a short distance, approximately 0.1 m from the hydrogen inlet jet, and the mixing intensity is high within 0.05 m of it. This validates the effectiveness of tube mixing for methane-hydrogen fuel enrichment.

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Issue

12th International Conference on Energy and Environment 2025: Towards Future Energy, CIEM 2025, 2026, Albania, https://doi.org/10.1109/CIEM67454.2025.11284642

Вид: публикация в международен форум, публикация в реферирано издание, индексирана в Scopus