Impact of temperature and pressure on stretch effects in lean, turbulent, premixed hydrogen flames

被引：0

作者：

Sanchez Bahoque, Gabriela ^{[1
]}

van Oijen, Jeroen ^{[1
]}

机构：

[1] Power and Flow, Department of Mechanical Engineering, Eindhoven University of Technology, De Zaale, North Brabant, Eindhoven

来源：

International Journal of Hydrogen Energy | 2025年 / 158卷

基金：

欧盟地平线“2020”;

关键词：

Hydrogen combustion; Preferential diffusion effect; Premixed flames; Stretch effect;

D O I：

10.1016/j.ijhydene.2025.150282

中图分类号：

学科分类号：

摘要：

The use of hydrogen as a carbon-free energy carrier is gaining significant attention as an option to reduce carbon emissions. However, hydrogen flames present challenges in achieving flame stability and low NOx emissions. To enhance the understanding of hydrogen combustion, this study investigates the effects of stretch and preferential diffusion on lean premixed hydrogen–air flames. Additionally, the influence of fresh gas temperatures and pressure on the flame structure and burning rates is studied. First, one-dimensional stretched flames are computed and different diffusion models are compared. The use of constant Lewis numbers including Soret diffusion, was found to achieve a good balance between accuracy and computational cost. Furthermore, Direct Numerical Simulations of three-dimensional turbulent flames in a planar jet were conducted. The mass burning rate of stretched hydrogen flames was found to be sensitive to variations in the hydrogen elemental mass fractions and in enthalpy at the flame front, with this sensitivity increasing at lower fresh gas temperatures and higher pressures. The turbulence and high diffusivity of hydrogen lead to a rapid wrinkling and formation of cellular structures along the flame front, with an even larger increase in the integral reaction rate, which leads to a stretch factor larger than 1 during most of the simulation time. The findings also indicate that stretch effects are primarily governed by strain rather than curvature. Strong strain rates lead to localized peaks of heat release rate in concavely curved regions, at lower unburnt temperature and pressures, driven by high H radical consumption. These results contribute to a better understanding of hydrogen combustion, by a systematic application and validation of existing theory, and support the development of models for turbulent premixed hydrogen–air flames, facilitating more realistic simulations in complex geometries such as gas turbines. © 2025 The Authors

引用

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