关于注入策略对内燃机燃烧性能影响的实验研究
Zhaoming Huang1,2, Liangmo Wang1, Hao Pan3
1School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
优化注射时间和双注射策略可显著提高内燃机的性能. 延迟注入时间提高了热效率,并大幅减少了NOx排放,使成为更清洁的燃料选择.
科学领域:
- 内部燃烧发动机的内部燃烧发动机
- 其他替代燃料 其他替代燃料
- 燃烧科学是一种科学.
背景情况:
- 提供快速燃烧率和接近零的碳排放,将其定位为一个有前途的替代燃料.
- 优化注入策略对于最大限度地利用在内燃机中的好处至关重要.
研究的目的:
- 实验研究注射时间,压力和双注射对燃烧性能的影响.
- 分析这些策略在不同多余空气系数 (λ) 和发动机负载下的影响.
主要方法:
- 对注射时间,注射压力和双注射参数进行系统的实验研究.
- 评价燃烧性能指标,包括热效率,氧化物排放,燃烧持续时间和热释放率.
- 在一系列多余空气系数 (λ = 1.0,1.5,2.3) 上进行测试.
主要成果:
- 延迟注入的时间提高了高达2.6%的热效率,并将NOx减少了近88%.
- 将气压升至8MPa将注射脉冲宽度降低了~75%,从而实现了延迟注射.
- 延迟二次注射末端 (SEOI) 减少了NOx超过47% (λ=1.5,1.0).
- 增加二次注入比例 (SIP) 降低了NOx超过43% (λ=1.5,1.0) 和在超薄条件下提高了14%的峰值热释放率 (λ=2.3).
结论:
- 注射时间和双注射参数的战略调整大大提高了发动机效率并减少了有害排放.
- 注射压力影响注射灵活性,而不是直接影响效率或排放.
- 双注入策略,特别是增加SIP,在减少NOx排放和改善燃烧特性方面是有效的,特别是在精益条件下.
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