1. An improved low and high-temperature dimethyl ether kinetic model for the combustion atmospheres with high CO2 concentration.
- Author
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Dai, Lingfeng, Lu, Lixin, Zou, Chun, Lin, Qianjin, Xia, Wenxiang, Shi, Haiyang, Luo, Jianghui, Peng, Chao, and Wang, Shusen
- Subjects
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ATMOSPHERIC carbon dioxide , *EXHAUST gas recirculation , *METHYL ether , *ATMOSPHERIC models , *CARBON dioxide , *SHOCK tubes , *IGNITION temperature , *FLAME temperature - Abstract
The Dimethyl ether (DME) kinetic model is significant to understand the DME combustion in the atmosphere containing high CO 2 concentration, such as pressurized oxy-fuel combustion process and exhaust gas recirculation, and design the combustor. In this paper, the ignition delay times (IDTs) of DME were measured in a shock tube under the conditions of equivalence ratios of 0.5, 1 and 1.5, temperature ranges from 1007 K to 1340 K, and pressures of 2 and 11 atm. A detailed kinetic model of DME named as OXYDME was put forward based on the OXY-Aramco model, and was validated by the low and high temperature IDTs, laminar flame speeds, and species profiles measured in this work and those from literatures in atmospheres of O 2 /Ar/CO 2 , O 2 /N 2 , O 2 /N 2 /He/CO 2 and O 2 /CO 2. The OXYDME model was compared with OXY-Aramco, Liu-DME model in detail. The effects of CO 2 on the DME ignition are very weak and not sensitive to the temperature and pressure. The reason for the weak effects of CO 2 is that the chemical effects of CO 2 promote ignition, which counteracts the inhibition effects caused by the physical properties of CO 2. The chaperon effects of CO 2 dominate the chemical effects. Meanwhile, the effects of the reactions with CO 2 are very small. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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