Lean Blow-Off Behaviour of Premixed Bluff-Body Stabilized Hydrocarbon-Air Flames and Ammonia/Hydrogen/Nitrogen-Air Flames

被引：0
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作者：
Su, Tong [1 ]
Xu, Boyan [2 ]
Bastiaans, R.J.M. [3 ]
Worth, Nicholas A. [1 ]
机构：
[1] Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim,NO-7034, Norway
[2] Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven,5612 AJ, Netherlands
[3] Eindhoven Institute for Renewable Energy Systems (EIRES), Eindhoven University of Technology, Eindhoven,5600 MB, Netherlands
来源：
Journal of Engineering for Gas Turbines and Power | 2024年 / 146卷 / 11期
关键词：
The lean blow-off (LBO) behavior of turbulent premixed bluff-body stabilized hydrocarbon flames and ammonia/hydrogen/nitrogen flame was investigated and compared both experimentally and numerically. Simultaneous high-speed PIV and OH-PLIF were employed to resolve temporal flame and flow field information; allowing the curvature and hydrodynamic strain rates along the flame surface to be calculated. OH∗ and NH∗2 chemiluminescence images were also used to examine flame structures at the same bulk flow velocity but at four equivalence ratios from far away from to near LBO. A NH3=H2=N2 (70%/ 22.5%/7.5%) flame is slightly more resilient to LBO compared with methane and propane flames at 20 m/s. The hydrocarbon flame structures change from V-shape to M-shape when approaching lean blow-off; resulting in incomplete reactions and finally trigger the LBO. However; the strong OH∗ intensity in the shear layer near flame root for the ammonia blend flames indicates a robust reaction which can increase flame stability. Widely-distributed positive curvature along the flame surface of the NH3=H2=N2 flames (Le 3=H2=N2 flame fronts due to less dramatic changes to the flame shape and position; which can extend the stability limits. Furthermore; the faster consumption rates of hydrogen near the flame root for the ammonia blend flames; and the lower temperature loss compared with the adiabatic temperature also contribute to the stabilization of ammonia blends near lean blow-off. Copyright © 2024 by ASME;
D O I：
10.1115/1.4065908
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