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射流温度对高温气体射流控制压缩着火的影响
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Indexed by:Journal Papers
Date of Publication:2019-07-26
Journal:中南大学学报（自然科学版）
Included Journals:EI、PKU
Volume:50
Issue:7
Page Number:1729-1735
ISSN No.:1672-7207
Key Words:柴油预混合;射流控制压缩着火;高温气体;数值模拟
Abstract:为了解决柴油预混合压燃着火相位的控制难题,采用高温气体射流控制压缩着火(jet controlled compression ignition,JCCI)的方法,其通过射流喷入一定量的高温气体来触发缸内处于着火临界状态的预混合气自燃,从而实现着火相位的有效控制.采用三维CFD耦合简化化学反应机理的方法,研究高温气体JCCI方式的着火和燃烧过程,分析射流温度分别为700,800,900和1000 K时对其燃烧和排放特性的影响.研究结果表明:在上止点附近射流喷入高温气体能触发缸内预混合气多点自燃;随着射流温度提高,高温反应始点前移,放热峰值升高;CA50前移,燃烧持续期缩短;此外,NOx排放逐渐增加,CO排放逐渐减少,soot排放量几乎为零.
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