Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles
In this study, we focused on a fuel reforming technology by applying ultrafine oxygen bubble as the pretreatment for in-cylinder combustion s. It is assumed that oxygen is dissolved in the droplets in the form of ultrafine bubbles, and released into air when the decane fuel evaporates. A numerical s...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/22/8467 |
| _version_ | 1797465457749393408 |
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| author | Kazuhiro Yamamoto Yusei Akai Naoki Hayashi |
| author_facet | Kazuhiro Yamamoto Yusei Akai Naoki Hayashi |
| author_sort | Kazuhiro Yamamoto |
| collection | DOAJ |
| description | In this study, we focused on a fuel reforming technology by applying ultrafine oxygen bubble as the pretreatment for in-cylinder combustion s. It is assumed that oxygen is dissolved in the droplets in the form of ultrafine bubbles, and released into air when the decane fuel evaporates. A numerical simulation of the spray combustion was conducted using a PSI-CELL model. We changed the oxygen concentration of the droplets, the initial droplet diameter, and the number of injected droplets per unit time to discuss the ignition time and the temperature field. When there is no oxygen in the fuel droplet, most of the flames are diffusion flames. On the other hand, when oxygen exists in the droplets, premixed flames are formed at the upstream edge of the fuel spray. Due to the effects of ultrafine oxygen bubbles, the ignition time is shortened. However, on the condition that there is only a small amount of oxygen in the fuel droplets, as more fuel is supplied by enlarging the droplet diameter or increasing the number of injected droplets per unit time, the ignition time increases. Thus, when discussing ignition time, the balance between evaporated fuel and oxygen in the gas phase is important. |
| first_indexed | 2024-03-09T18:21:46Z |
| format | Article |
| id | doaj.art-a7827d4b4291430bb25c8a48e6878be5 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T18:21:46Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-a7827d4b4291430bb25c8a48e6878be52023-11-24T08:13:32ZengMDPI AGEnergies1996-10732022-11-011522846710.3390/en15228467Numerical Simulation of Spray Combustion with Ultrafine Oxygen BubblesKazuhiro Yamamoto0Yusei Akai1Naoki Hayashi2Department of Mechanical Systems Engineering, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-shi 464-8603, Aichi, JapanDepartment of Mechanical Systems Engineering, Faculty of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-shi 464-8603, Aichi, JapanDepartment of Mechanical Engineering, Kanagawa Institute of Technology, Shimo-ogino, Atsugi-shi 243-0292, Kanagawa, JapanIn this study, we focused on a fuel reforming technology by applying ultrafine oxygen bubble as the pretreatment for in-cylinder combustion s. It is assumed that oxygen is dissolved in the droplets in the form of ultrafine bubbles, and released into air when the decane fuel evaporates. A numerical simulation of the spray combustion was conducted using a PSI-CELL model. We changed the oxygen concentration of the droplets, the initial droplet diameter, and the number of injected droplets per unit time to discuss the ignition time and the temperature field. When there is no oxygen in the fuel droplet, most of the flames are diffusion flames. On the other hand, when oxygen exists in the droplets, premixed flames are formed at the upstream edge of the fuel spray. Due to the effects of ultrafine oxygen bubbles, the ignition time is shortened. However, on the condition that there is only a small amount of oxygen in the fuel droplets, as more fuel is supplied by enlarging the droplet diameter or increasing the number of injected droplets per unit time, the ignition time increases. Thus, when discussing ignition time, the balance between evaporated fuel and oxygen in the gas phase is important.https://www.mdpi.com/1996-1073/15/22/8467spray combustionfuel reformingultrafine bubblesignitionflammable mixture |
| spellingShingle | Kazuhiro Yamamoto Yusei Akai Naoki Hayashi Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles Energies spray combustion fuel reforming ultrafine bubbles ignition flammable mixture |
| title | Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles |
| title_full | Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles |
| title_fullStr | Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles |
| title_full_unstemmed | Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles |
| title_short | Numerical Simulation of Spray Combustion with Ultrafine Oxygen Bubbles |
| title_sort | numerical simulation of spray combustion with ultrafine oxygen bubbles |
| topic | spray combustion fuel reforming ultrafine bubbles ignition flammable mixture |
| url | https://www.mdpi.com/1996-1073/15/22/8467 |
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