Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition
The direct injection of ethanol-gasoline blended fuel into the engine cylinder near the top dead center (TDC) is evitable to suffer from the wall impingement due to more injection mass required to maintain the same air/fuel ratio with traditional fossil fuels. In this study, the evaporation characte...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Applications in Energy and Combustion Science |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666352X23001139 |
| _version_ | 1827739816304836608 |
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| author | Run CHEN Keiya NISHIDA Xinyi ZHOU Tie LI |
| author_facet | Run CHEN Keiya NISHIDA Xinyi ZHOU Tie LI |
| author_sort | Run CHEN |
| collection | DOAJ |
| description | The direct injection of ethanol-gasoline blended fuel into the engine cylinder near the top dead center (TDC) is evitable to suffer from the wall impingement due to more injection mass required to maintain the same air/fuel ratio with traditional fossil fuels. In this study, the evaporation characteristics of E85 cold-start impinging spray were investigated by experiments and numerical simulation. A constant volume vessel was used to produce the direct-injection spark-ignition (DISI) engine-like conditions. The ultraviolet (UV) – visible (Vis) dual-wavelength laser absorption scattering (LAS) technique was employed to quantitatively measure the individual components evaporation in E85, with the emphasis on the effects of impinging distance, wall temperature and injection pressure on the mixture formation. The results show that although the larger impinging distance rarely influences the evaporation before impingement, it facilitates the E85 evaporation process after impingement due to the better atomization by low boiling point (LBP) components (e.g. ethanol). The effects of cold-start wall temperature on the E85 impinging spray are greatly dependent on the impinging distance. Under the small impinging distance, the ethanol and low boiling point (LBP) components of gasoline evaporate faster after impingement at higher wall temperature, but such effect becomes absent under long impinging distance. Therefore, the smaller impinging distance shows a higher sensitivity to wall temperature. Lower wall temperature leads to a high wall heat transfer, thus potentially extend the evaporation time at the near wall region along the spray axis. At either impingement timing or initial impingement, the LBP component with high latent heat evaporates fast, leading to a decrease of surrounding gas temperature. Increasing injection pressure helps to greatly improve the evaporation of the high boiling point (HBP) component in gasoline under cold-start impingement. The evaporation ratio of E85 increases up to about 18% ∼ 30% than that of E100 at the initial impinging period under cold-start condition. |
| first_indexed | 2024-03-11T03:13:23Z |
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| institution | Directory Open Access Journal |
| issn | 2666-352X |
| language | English |
| last_indexed | 2024-03-11T03:13:23Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
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| series | Applications in Energy and Combustion Science |
| spelling | doaj.art-60e6b5b9c32e46239dc7534be7eed93a2023-11-18T04:29:47ZengElsevierApplications in Energy and Combustion Science2666-352X2023-12-0116100224Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start conditionRun CHEN0Keiya NISHIDA1Xinyi ZHOU2Tie LI3State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Power Plants and Automation, Shanghai Jiao Tong University, Shanghai, 200240, China; Corresponding author.Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, JapanState Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Power Plants and Automation, Shanghai Jiao Tong University, Shanghai, 200240, ChinaState Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Institute of Power Plants and Automation, Shanghai Jiao Tong University, Shanghai, 200240, ChinaThe direct injection of ethanol-gasoline blended fuel into the engine cylinder near the top dead center (TDC) is evitable to suffer from the wall impingement due to more injection mass required to maintain the same air/fuel ratio with traditional fossil fuels. In this study, the evaporation characteristics of E85 cold-start impinging spray were investigated by experiments and numerical simulation. A constant volume vessel was used to produce the direct-injection spark-ignition (DISI) engine-like conditions. The ultraviolet (UV) – visible (Vis) dual-wavelength laser absorption scattering (LAS) technique was employed to quantitatively measure the individual components evaporation in E85, with the emphasis on the effects of impinging distance, wall temperature and injection pressure on the mixture formation. The results show that although the larger impinging distance rarely influences the evaporation before impingement, it facilitates the E85 evaporation process after impingement due to the better atomization by low boiling point (LBP) components (e.g. ethanol). The effects of cold-start wall temperature on the E85 impinging spray are greatly dependent on the impinging distance. Under the small impinging distance, the ethanol and low boiling point (LBP) components of gasoline evaporate faster after impingement at higher wall temperature, but such effect becomes absent under long impinging distance. Therefore, the smaller impinging distance shows a higher sensitivity to wall temperature. Lower wall temperature leads to a high wall heat transfer, thus potentially extend the evaporation time at the near wall region along the spray axis. At either impingement timing or initial impingement, the LBP component with high latent heat evaporates fast, leading to a decrease of surrounding gas temperature. Increasing injection pressure helps to greatly improve the evaporation of the high boiling point (HBP) component in gasoline under cold-start impingement. The evaporation ratio of E85 increases up to about 18% ∼ 30% than that of E100 at the initial impinging period under cold-start condition.http://www.sciencedirect.com/science/article/pii/S2666352X23001139E85Evaporation characteristicsImpinging sprayCold-start condition |
| spellingShingle | Run CHEN Keiya NISHIDA Xinyi ZHOU Tie LI Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition Applications in Energy and Combustion Science E85 Evaporation characteristics Impinging spray Cold-start condition |
| title | Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition |
| title_full | Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition |
| title_fullStr | Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition |
| title_full_unstemmed | Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition |
| title_short | Experimental and simulation study on evaporation characteristics of E85 impinging spray under DISI cold-start condition |
| title_sort | experimental and simulation study on evaporation characteristics of e85 impinging spray under disi cold start condition |
| topic | E85 Evaporation characteristics Impinging spray Cold-start condition |
| url | http://www.sciencedirect.com/science/article/pii/S2666352X23001139 |
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