期刊
ENERGY CONVERSION AND MANAGEMENT
卷 94, 期 -, 页码 293-299出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2015.01.014
关键词
Micro-combustor; Hollow hemispherical bluff body; Numerical investigation; Combustion characteristics; Blow-off limit
资金
- Fundamental Research Funds for the Central Universities [CDJZR14145501]
- Chongqing Science and Technology Talent Training Plan [cstc2013kjrc-qnrc90002]
- National Natural Science Foundation of China [50906103]
The combustion characteristics of methane in a cube micro-combustor with a hollow hemispherical bluff body were numerically investigated. The blow-off limit, recirculation zone length and methane conversion rate were examined. The results illustrate that the blow-off limit of the micro-combustor with a hollow hemispherical bluff body is 2.5 times higher than that without bluff body, which are 24.5 m/s and 9.5 m/s at the same equivalence ratio (phi = 1), respectively. With the use of hollow hemispherical bluff body, methane conversion sharply increases from 0.24% to 17.95% at 3 mm along the inlet-flow direction, where is the location of bluff-body, which is not affected by equivalence ratio and inlet velocity. The recirculation zone size has determined influence on residence time of the mixture gas, which increases with the increase of inlet velocity. Methane conversion rate is determined by equivalence ratio and inlet velocity. Methane conversion rate firstly increases and then decreases when the equivalence ratio and inlet velocity increase, reaching the maximum value (97.84%) at phi = 1 and 0.02 m/s. Methane conversion rate sharply increases from 45% to 97.84% when the inlet velocity increases from 0.008 m/s to 0.02 m/s. (C) 2015 Elsevier Ltd. All rights reserved.
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