Numerical investigation of premixed and non-premixed hydrogen flames using large-eddy simulations and flamelet models
File(s)
Published version
Author(s)
Masucci, Antonio
Ghisu, Tiziano
Giusti, Andrea
Type
Conference Paper
Abstract
A numerical investigation of premixed and non-premixed hydrogen flames is performed with the main aim of assessing the capability of large-eddy simulations and flamelet models to predict the main characteristics of the reactive field. Two different burners are investigated: (i) a premixed bluff body burner fuelled with a lean hydrogen-air mixture (ϕ = 0.4) and (ii) a non-premixed dual-swirl coaxial injector for which experiments show both anchored and lifted flames for the same global equivalence ratio (ϕg = 0.45). Simulations of the premixed burner are performed using the Flamelet Generated Manifold approach, whereas the two types of flames realized in the non-premixed burner are studied using the Steady Diffusion Flamelet and the Flamelet Generated Manifold. Numerical results are compared with the available experimental data for flow and flame characterization. As far as the velocity field is concerned, the investigated flamelet models have demonstrated capability to properly predict the location and magnitude of the velocity peaks and the shape of the inner recirculation zone in both the premixed and non-premixed cases. Moreover, the computational framework used in this study has demonstrated good accuracy in the prediction of the dynamic behavior of the flow. Regarding the structure of the flame, the models have shown a good capability to predict both the shape of the flame and the location of regions of high-intensity heat release rate. The present investigation offers a comprehensive assessment of large-eddy simulations and flamelet methods in the prediction of the behavior of two archetypes of hydrogen flames of industrial interest. The assessment shown here can provide support for the choice of methods to study cases with increased level of complexity.
Date Issued
2025-08-11
Date Acceptance
2025-06-01
Citation
Proceedings of the ASME Turbo Expo, 2025, Volume 3A: Combustion, Fuels & Emissions
ISBN
978-0-7918-8878-0
Publisher
American Society of Mechanical Engineers
Journal / Book Title
Proceedings of the ASME Turbo Expo
Volume
Volume 3A: Combustion, Fuels & Emissions
Copyright Statement
Copyright © 2025 by ASME; reuse license CC-BY 4.0.
License URL
Source
ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition
Subjects
Turbulent Combustion
Large Eddy Simulation
Hydrogen Combustion
Bluff-body
Swirling flames
Premixed combustion
Non premixed combus-
Publication Status
Published
Start Date
2025-06-16
Finish Date
2025-06-20
Coverage Spatial
Memphis, Tennessee, USA
Date Publish Online
2025-08-11