期刊
RENEWABLE ENERGY
卷 154, 期 -, 页码 209-222出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.03.037
关键词
Methanol; Hydrogen addition; Laminar flame; Initial temperature; Kinetics analysis
资金
- National Key Research and Development Program of China [2017YFB0103402]
- Beijing Municipal Natural Science Foundation, China [3192030]
- State Key Laboratory of Engines, Tianjin University, China [K2018-03]
Methanol has been regarded as a promising alternative fuel. However, the problem in cold start and the resulting high emissions consistently constrain the development of methanol engines. Meanwhile, blending hydrogen in methanol has the potential to alleviate the above problem. Effects of blending hydrogen on the laminar flames of methanol under changing initial temperatures was then investigated. The experiments were undertaken in a constant volume chamber. The chemical mechanism investigation was conducted using CHEMKIN. The hydrogen fraction increased from 0 to 0.8. The initial temperature changed from 350 K to 450 K. The results show that increasing the initial temperature and hydrogen component accelerate the flame propagation. For flames at 450 K and Phi = 1.2, when the hydrogen fraction increases from 0 to 0.8, the laminar flame speeds are 4.80, 4.85, 7.00, 9.27, 15.50 (m/s), respectively. Markstein length decreases and then increases with the increase in hydrogen fraction. For flames at 400 K and Phi = 1.0, when the hydrogen fraction increases from 0 to 0.8, the maximum mole fraction of H atom increases from 0.008 to 0.025 (a threefold increase). The rapidly accumulating hydrogen atoms promote the chain branching reaction (R5: O-2 +H=O + OH) and accelerate the combustion process. (C) 2020 Elsevier Ltd. All rights reserved.
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