Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity
Reduced and normal gravity combustion experiments were performed with fiber-supported methanol droplets with initial diameters in the 1 mm size range. Experiments were performed with air-diluent mixtures at about 0.101 MPa and 298 K, where carbon dioxide, helium, or xenon was separately used as the...
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Wiley
2012-01-01
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| Series: | Journal of Combustion |
| Online Access: | http://dx.doi.org/10.1155/2012/587987 |
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| author | Benjamin Shaw Jingbin Wei |
| author_facet | Benjamin Shaw Jingbin Wei |
| author_sort | Benjamin Shaw |
| collection | DOAJ |
| description | Reduced and normal gravity combustion experiments were performed with fiber-supported methanol droplets with initial diameters in the 1 mm size range. Experiments were performed with air-diluent mixtures at about 0.101 MPa and 298 K, where carbon dioxide, helium, or xenon was separately used as the diluent gas. Results indicate that ambient gas transport properties play an important role in determining flammability and combustion behaviors including burning rates and radiant heat output histories of the droplets. Droplets would burn with significantly higher mole fractions of xenon than helium or carbon dioxide. In reduced gravity, droplets would burn steadily with a xenon mole fraction of 0.50 but would not burn steadily if helium or carbon dioxide mole fractions were 0.50. Comparison with previous experimental data shows that ignitability and combustion characteristics of droplets are influenced by the fuel type and also the gravitational level. Burning rates were about 40% to 70% higher in normal gravity than in reduced gravity. Methanol droplets also had burning rates that were typically larger than 1-propanol burning rates by about 20% in reduced gravity. In normal gravity, however, burning rate differences between the two fuels were significantly smaller. |
| format | Article |
| id | doaj-art-83c0afba7be543f8a71ab49f65602e15 |
| institution | Kabale University |
| issn | 2090-1968 2090-1976 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
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| series | Journal of Combustion |
| spelling | doaj-art-83c0afba7be543f8a71ab49f65602e152025-02-03T05:45:50ZengWileyJournal of Combustion2090-19682090-19762012-01-01201210.1155/2012/587987587987Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal GravityBenjamin Shaw0Jingbin Wei1Department of Mechanical and Aerospace Engineering, University of California, Davis, CA 95616, USADepartment of Mechanical and Aerospace Engineering, University of California, Davis, CA 95616, USAReduced and normal gravity combustion experiments were performed with fiber-supported methanol droplets with initial diameters in the 1 mm size range. Experiments were performed with air-diluent mixtures at about 0.101 MPa and 298 K, where carbon dioxide, helium, or xenon was separately used as the diluent gas. Results indicate that ambient gas transport properties play an important role in determining flammability and combustion behaviors including burning rates and radiant heat output histories of the droplets. Droplets would burn with significantly higher mole fractions of xenon than helium or carbon dioxide. In reduced gravity, droplets would burn steadily with a xenon mole fraction of 0.50 but would not burn steadily if helium or carbon dioxide mole fractions were 0.50. Comparison with previous experimental data shows that ignitability and combustion characteristics of droplets are influenced by the fuel type and also the gravitational level. Burning rates were about 40% to 70% higher in normal gravity than in reduced gravity. Methanol droplets also had burning rates that were typically larger than 1-propanol burning rates by about 20% in reduced gravity. In normal gravity, however, burning rate differences between the two fuels were significantly smaller.http://dx.doi.org/10.1155/2012/587987 |
| spellingShingle | Benjamin Shaw Jingbin Wei Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity Journal of Combustion |
| title | Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity |
| title_full | Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity |
| title_fullStr | Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity |
| title_full_unstemmed | Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity |
| title_short | Combustion of Methanol Droplets in Air-Diluent Environments with Reduced and Normal Gravity |
| title_sort | combustion of methanol droplets in air diluent environments with reduced and normal gravity |
| url | http://dx.doi.org/10.1155/2012/587987 |
| work_keys_str_mv | AT benjaminshaw combustionofmethanoldropletsinairdiluentenvironmentswithreducedandnormalgravity AT jingbinwei combustionofmethanoldropletsinairdiluentenvironmentswithreducedandnormalgravity |