Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle
Abstract The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors...
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| Format: | Article |
| Language: | English |
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Springer
2021-07-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.210138 |
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| author | Han Wu Cong Liu Longmin Tang Chunze Cen Sheng-Lun Lin Chien-Er Huang |
| author_facet | Han Wu Cong Liu Longmin Tang Chunze Cen Sheng-Lun Lin Chien-Er Huang |
| author_sort | Han Wu |
| collection | DOAJ |
| description | Abstract The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors those could effectively control the fuel atomization and avoided the formation of wall-attached fuel layer. We accelerated the volatilization of ethanol droplets after contacting the liquid surface and even achieved the flash evaporation condition to burst the oil layer, which was conducive to cleaning the inner wall of the combustors and reducing emissions. A 3.12-mm ethanol droplet was used to impact a glycerol pool. The Weber number (WE, 303–1343) and pool temperature (T, 50–260°C) were two controlled parameters to explore the impaction characteristics. There were four typical phenomena observed, including surface dissolving, penetrating dissolution, vapor explosions, and nucleate boiling. Results showed that the maximum volume and surface area of the crater increased with the WE and the liquid pool temperature during impaction. Meanwhile, the boundary temperatures between the penetrating dissolution and the vapor explosion decreased. Additionally, the vapor explosion time increased with the WE but negatively correlated to the liquid pool temperature. The entire vapor explosion process was very short, lasting about 200 milliseconds. Furthermore, the increasing WE had a negative effect on the nucleate boiling intensity when the liquid pool temperature significantly enhanced it. Consequently, the fuel droplet atomization and explosion could be sensitively controlled by varying the WE and the temperature of impaction surface. This finding provides valuable information to the designer of combustor control unit to inhibit and destroy the wall-attached fuel layer during the spry combustion and further inhibit the formation of combustion aerosol particles. |
| format | Article |
| id | doaj-art-062e79169eea4659bb93c689929abd15 |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2021-07-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-062e79169eea4659bb93c689929abd152025-02-09T12:21:14ZengSpringerAerosol and Air Quality Research1680-85842071-14092021-07-01211011410.4209/aaqr.210138Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol ParticleHan Wu0Cong Liu1Longmin Tang2Chunze Cen3Sheng-Lun Lin4Chien-Er Huang5School of Mechanical Engineering, Beijing Institute of TechnologySchool of Mechanical Engineering, Beijing Institute of TechnologySchool of Mechanical Engineering, Beijing Institute of TechnologyDepartment of Mechanical, Aerospace and Civil Engineering, University of ManchesterSchool of Mechanical Engineering, Beijing Institute of TechnologyCenter for Environmental Toxin and Emerging-contaminant Research, Cheng Shiu UniversityAbstract The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors those could effectively control the fuel atomization and avoided the formation of wall-attached fuel layer. We accelerated the volatilization of ethanol droplets after contacting the liquid surface and even achieved the flash evaporation condition to burst the oil layer, which was conducive to cleaning the inner wall of the combustors and reducing emissions. A 3.12-mm ethanol droplet was used to impact a glycerol pool. The Weber number (WE, 303–1343) and pool temperature (T, 50–260°C) were two controlled parameters to explore the impaction characteristics. There were four typical phenomena observed, including surface dissolving, penetrating dissolution, vapor explosions, and nucleate boiling. Results showed that the maximum volume and surface area of the crater increased with the WE and the liquid pool temperature during impaction. Meanwhile, the boundary temperatures between the penetrating dissolution and the vapor explosion decreased. Additionally, the vapor explosion time increased with the WE but negatively correlated to the liquid pool temperature. The entire vapor explosion process was very short, lasting about 200 milliseconds. Furthermore, the increasing WE had a negative effect on the nucleate boiling intensity when the liquid pool temperature significantly enhanced it. Consequently, the fuel droplet atomization and explosion could be sensitively controlled by varying the WE and the temperature of impaction surface. This finding provides valuable information to the designer of combustor control unit to inhibit and destroy the wall-attached fuel layer during the spry combustion and further inhibit the formation of combustion aerosol particles.https://doi.org/10.4209/aaqr.210138Droplet impactionWeber numberLiquid surface temperatureVapor explosionNucleate boiling |
| spellingShingle | Han Wu Cong Liu Longmin Tang Chunze Cen Sheng-Lun Lin Chien-Er Huang Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle Aerosol and Air Quality Research Droplet impaction Weber number Liquid surface temperature Vapor explosion Nucleate boiling |
| title | Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle |
| title_full | Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle |
| title_fullStr | Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle |
| title_full_unstemmed | Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle |
| title_short | Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle |
| title_sort | inhibition of the wall attached fuel combustion and the formation of aerosol particle |
| topic | Droplet impaction Weber number Liquid surface temperature Vapor explosion Nucleate boiling |
| url | https://doi.org/10.4209/aaqr.210138 |
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