The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System
In the context of the energy crisis and global warming, improving thermal efficiency is the most important issue in research on gasoline engines, and lean mixture combustion strategy is becoming the most promising method. Thus, a high compression ratio, a high-power interval ignition system, and a s...
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MDPI AG
2023-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/16/15/5662 |
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| author | Zhiqiang Li Jing Qin Yiqiang Pei Kai Zhong Zhiyong Zhang Jian Sun |
| author_facet | Zhiqiang Li Jing Qin Yiqiang Pei Kai Zhong Zhiyong Zhang Jian Sun |
| author_sort | Zhiqiang Li |
| collection | DOAJ |
| description | In the context of the energy crisis and global warming, improving thermal efficiency is the most important issue in research on gasoline engines, and lean mixture combustion strategy is becoming the most promising method. Thus, a high compression ratio, a high-power interval ignition system, and a stratified combustion scheme achieved via dual injection were novelly adopted in a single cylinder gasoline engine in this study. The results show that the lean combustion limit could be literally extended and improved thermal efficiency was observed under the ultra-lean condition. Meanwhile, reverse combustion performance trends were observed by altering the second injection proportion from 30% to 45% under the lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.6) and ultra-lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.9). This was related to a combustion velocity change caused by great concentration gradient at the middle and end combustion stage. Finally, according to research on the effects of altering the timing of the second injection, it is clear that the dual injection strategy is an ideal method for realizing operation under the lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.6). But for the operation under the ultra-lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.9), more injection times and suitable air flow organization are needed to enhance the robustness of mixture distribution. |
| first_indexed | 2024-03-11T00:28:52Z |
| format | Article |
| id | doaj.art-e7bde1a67160466aafe5cb08886178fe |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T00:28:52Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-e7bde1a67160466aafe5cb08886178fe2023-11-18T22:51:10ZengMDPI AGEnergies1996-10732023-07-011615566210.3390/en16155662The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition SystemZhiqiang Li0Jing Qin1Yiqiang Pei2Kai Zhong3Zhiyong Zhang4Jian Sun5State Key Laboratory of Engines, Tianjin University, Tianjin 300072, ChinaInternal Combustion Engine Research Institute, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Engines, Tianjin University, Tianjin 300072, ChinaState Key Laboratory of Engines, Tianjin University, Tianjin 300072, ChinaGreat Wall Motor Co., Ltd., Baoding 071000, ChinaGreat Wall Motor Co., Ltd., Baoding 071000, ChinaIn the context of the energy crisis and global warming, improving thermal efficiency is the most important issue in research on gasoline engines, and lean mixture combustion strategy is becoming the most promising method. Thus, a high compression ratio, a high-power interval ignition system, and a stratified combustion scheme achieved via dual injection were novelly adopted in a single cylinder gasoline engine in this study. The results show that the lean combustion limit could be literally extended and improved thermal efficiency was observed under the ultra-lean condition. Meanwhile, reverse combustion performance trends were observed by altering the second injection proportion from 30% to 45% under the lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.6) and ultra-lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.9). This was related to a combustion velocity change caused by great concentration gradient at the middle and end combustion stage. Finally, according to research on the effects of altering the timing of the second injection, it is clear that the dual injection strategy is an ideal method for realizing operation under the lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.6). But for the operation under the ultra-lean condition (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>λ</mi></semantics></math></inline-formula> = 1.9), more injection times and suitable air flow organization are needed to enhance the robustness of mixture distribution.https://www.mdpi.com/1996-1073/16/15/5662direct injection spark enginelean combustionstratified combustionhigh compression ratio |
| spellingShingle | Zhiqiang Li Jing Qin Yiqiang Pei Kai Zhong Zhiyong Zhang Jian Sun The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System Energies direct injection spark engine lean combustion stratified combustion high compression ratio |
| title | The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System |
| title_full | The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System |
| title_fullStr | The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System |
| title_full_unstemmed | The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System |
| title_short | The Lean-Burn Limit Extending Experiment on Gasoline Engine with Dual Injection Strategy and High Power Ignition System |
| title_sort | lean burn limit extending experiment on gasoline engine with dual injection strategy and high power ignition system |
| topic | direct injection spark engine lean combustion stratified combustion high compression ratio |
| url | https://www.mdpi.com/1996-1073/16/15/5662 |
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