关于二次注射对醇发动机燃烧和排放的影响的研究
Xiumin Yu1,2, Tianqi Wang1,2, Yaodong Du1,2
1State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China.
ACS omega
|October 2, 2023
概括
在火花点燃发动机中二次注射n-butanol可以产生分层燃烧. 对于效率和减少排放的最佳结果发生在特定的注射时间和较低的比率下,而高比率会降低性能.
科学领域:
- 内部燃烧发动机 内部燃烧发动机
- 其他替代燃料 替代燃料
- 优化燃烧方式的优化
背景情况:
- n-butanol是一种有前途的有氧化生物燃料,具有类似汽油的特性.
- 直接注入技术为内燃机提供灵活性和控制.
- 分层燃烧旨在提高发动机效率并减少排放.
研究的目的:
- 研究二次n-butanol注射对分层燃烧的影响.
- 优化燃烧参数以提高热效率和减少排放.
- 分析第二次注入比率和时间对发动机性能的影响.
主要方法:
- 在四四冲程火花点火发动机上进行的实验.
- 在固体测量条件下 (多余空气比=1) 在每分钟1500转和低负载下进行二次注射n-butanol.
- 不同的第二次注射比率和时间 (例如100°CA BTDC,125°CA BTDC).
主要成果:
- 在特定的时间实现了分层燃烧 (100°CA BTDC,125°CA BTDC).
- 较低的二次注入比率提高了制动热效率,并减少了HC和CO排放.
- 高的二次注入比率 (>60%) 导致燃烧不完全,效率降低,排放量增加.
- 在分层条件下,在40%的第二次注射比率下观察到的粒子数量减少.
结论:
- 在SI发动机中,二次注入n-butanol对于分层燃烧是可行的.
- 最佳的性能需要仔细选择注射时间和比例.
- 需要进一步的研究来平衡效率的增长与在更高的注射比率的潜在缺点.
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