Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 17, Pages 10069-10082Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.01.0970360-3199
Keywords
Nonlinear extrapolation; Hydrogen; oxygen; Laminar burning velocity; Flame instability; Hydrodynamic instability; Thermal diffusion instability
Categories
Funding
- National Natural Science Foundation of China [11572044]
- National Key Research and Development Program of China [2017YFC0804705]
- Open Fund of Key Laboratory of Mining Disaster Prevention and Control [SMDPC202109]
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This study investigates the propagation characteristics of H2/O2 flames, finding that LBV changes with increasing ER and IMP and the flame remains stable under certain conditions.
The extreme explosiveness and high flame velocity of hydrogen challenge its application. Overcoming these challenges requires improving the fundamental flame characteristics of H2/O2 mixtures. In this study, the propagation characteristics of H2/O2 flames are investigated. The laminar burning velocity (LBV) is evaluated using nonlinear extrapolation. The empirical relations of LBV are given with the equivalence ratio (ER) and initial mixture pressure (IMP). The LBV increases first and then decreases as the ER increases and reaches its maximum value at the ER slightly higher than 1.0 (4 1/4 1.1-1.2). The LBV increases monotonically with increasing IMP. The critical instability radius and Markstein length increase as the ER increases, while decreasing with the IMP increase. The flame thickness decreases significantly with increasing IMP. The flame remains stable and smooth throughout the propagation process for all examined ERs only at the lower IMPs of 0.1 atm and 0.3 atm.
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