使用电荷稀释和火花辅助控制DME HCCI的燃烧控制
Xiao Yu1, Simon LeBlanc1, Navjot Sandhu1
1Department of Mechanical, Automotive, and Materials Engineering, University of Windsor, Windsor, ON, Canada.
概括
用二甲基以太 (DME) 作为燃料的同质电荷压缩点火 (HCCI) 燃烧可以实现超低的NOx排放. 像二氧化碳稀释和火花辅助等策略可以实现更高的发动机负载,最高可达8bar IMEP.
科学领域:
- 内部燃烧发动机 内部燃烧发动机
- 燃烧科学 燃烧科学
- 其他替代燃料 替代燃料
背景情况:
- 双甲基以太 (DME) 提供了清洁燃烧的潜力,但有效的燃料控制对于其在同质电荷压缩点火 (HCCI) 发动机中的应用至关重要.
- 高压直接注入和低压端口注入策略都为DME燃料的HCCI带来了独特的挑战和优势.
- 在较高的发动机负载下实现稳定的HCCI燃烧仍然是一个重大障碍,特别是由于预燃烧的风险,由于端口燃料注入.
研究的目的:
- 评估适用于DME-HCCI燃烧的低压燃料输送范围,涉及发动机负载,空气-燃料比率和惰性气体稀释.
- 探索扩大DME燃料HCCI燃烧的负载能力的策略.
- 调查稀释和火花辅助对燃烧阶段和排放的影响.
主要方法:
- 对DME-HCCI的高压直接注入和低压端口注入策略的审查和评估.
- 在瘦燃烧和CO2稀释条件下对DME-HCCI燃烧的实验研究.
- 研究火花辅助与过多的空气和二氧化碳稀释相结合的情况.
主要成果:
- 精益燃烧策略显示,燃烧阶段控制在5bar IMEP以上是有限的.
- 二氧化碳稀释有效减缓了燃烧阶段化,但可能导致不稳定.
- 与过剩的空气和CO2稀释相结合的火花辅助,使HCCI燃烧稳定,最高可达8bar IMEP.
结论:
- 低压端口注入DME用于HCCI燃烧需要仔细管理空气-燃料比率和稀释,以延长负载.
- 二氧化碳稀释和火花辅助是控制燃烧阶段化的有效策略,并扩大DME-HCCI发动机的运行负载范围.
- 综合方法实现了高发动机负载 (8bar IMEP) 适当的燃烧分阶段和极低的NOx排放,证明了清洁的DME燃烧的可行途径.
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