Experimental and numerical investigations of hydrogen–air premixed combustion in a converging–diverging micro tube

Experimental and numerical studies of hydrogen–air premixed combustion in a converging–diverging micro tube with inner diameters of the inlet, throat, and outlet of 2, 1, and 2 mm, respectively, have been performed to study the combustion and flame characteristics. The influences of the equivalence...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-02, Vol.39 (7), p.3469-3476
Main Authors: Yang, Weijuan, Deng, Chen, Zhou, Junhu, Liu, Jianzhong, Wang, Yang, Cen, Kefa
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Combustion
Combustion stability
Energy
Exact sciences and technology
Flame characteristics
Fuels
Heat loss
Hydrogen
Hydrogen-based energy
Inlets
Micro tube
Outlets
Throats
Tubes
Wall temperature
Walls
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Summary:Experimental and numerical studies of hydrogen–air premixed combustion in a converging–diverging micro tube with inner diameters of the inlet, throat, and outlet of 2, 1, and 2 mm, respectively, have been performed to study the combustion and flame characteristics. The influences of the equivalence ratio (Φ) and inlet velocity (vin) are investigated. The experiments reveal that the vin range for stable combustion—between 3.4 and 41.4 m/s—was significantly expanded, particularly when Φ = 1.4. This effect can primarily be attributed to the converging–diverging structure. As Φ increased, both the wall and the flame temperatures exhibited an increasing–decreasing trend; the largest heat loss ratio occurred at Φ = 1.0. The ignition position initially moved upstream and then moved downstream. The flame thickness increased and then decreased, reaching its peak value at Φ = 1.2. The flame length decreased monotonously. As vin increased, the wall temperature increased, the flame temperature decreased, and the flame moved downstream to grow thicker and longer. •H2/air premixed micro combustion was studied by experiments and simulation.•Structure of converging–diverging expanded the stable combustion limits.•Temperature, ignition position, and flame characteristics were studied.•Effects of equivalence ratio and inlet velocity were discussed.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2013.12.102