Shock Tube and Kinetic Study on the Effects of CO2 on Dimethyl Ether Autoignition at High Pressures
| Autor: | Lisa Zander, Mike Rekus, Johann Vinkeloe, Neda Djordjevic |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Range (particle radiation)
Materials science General Chemical Engineering Analytical chemistry Energy Engineering and Power Technology Autoignition temperature 02 engineering and technology 021001 nanoscience & nanotechnology Kinetic energy Dilution chemistry.chemical_compound Fuel Technology 020401 chemical engineering chemistry Dimethyl ether 0204 chemical engineering 0210 nano-technology Shock tube Temperature coefficient Bar (unit) |
| Zdroj: | Energy & Fuels. 33:10197-10208 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/acs.energyfuels.9b01575 |
| Popis: | First-stage and overall ignition delay times of dimethyl ether (DME) were measured in a high-pressure shock tube for various mixtures containing high amounts of CO2. The data are available for DME/air mixtures diluted with 40% CO2 as well as for the mixture of DME and oxidizer containing 20.5% O2 and 79.5% CO2. As a reference, data were also collected for mixtures containing the corresponding amounts of N2. Measurements were conducted for pressures of 15, 35, and 50 bar and a range of temperatures (744–1316 K). For the DME/air mixture diluted with CO2, the equivalence ratio was varied in the range of 0.5–2.0. The results demonstrate that CO2 dilution has a strong effect on ignition delay times in the NTC (negative temperature coefficient) region. The kinetic study that was conducted showed that this phenomenon can be attributed to a thermal effect resulting from the high heat capacity of CO2. In low and high temperature ranges, the effect of CO2 is less pronounced. Additionally, a chemical effect was iden... |
| Databáze: | OpenAIRE |
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