Supercharged Homogeneous Charge Compression Ignition
Supercharged Homogeneous Charge Compression Ignition
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DOI：
10.4271/980787
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发表时间：
1998-02
影响因子：
1.2
通讯作者：
M. Christensen;B. Johansson;Per Amnéus;F. Mauss
中科院分区：
文献类型：
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作者：
M. Christensen;B. Johansson;Per Amnéus;F. Mauss
均质充量压燃（HCCI）是往复式发动机的第三种燃烧方式。这里使用的是火花点火发动机中的均质充量，但充量被压缩到柴油机中的自燃。与火花点火（SI）发动机相比，其主要区别在于没有火焰传播，因此不受湍流的影响。与柴油发动机相比，HCCI具有均匀的充气，因此没有与碳烟和NOx形成相关的问题。早期的研究表明，HCCI的高效率和非常低的NOx量，但HC和CO高于SI模式。用HCCI不可能获得高的IMEP值，极限为5巴。增压是显著增加IMEP的一种方法。因此，增压对HCCI的影响进行了实验研究。实验中使用了三种不同的燃料：异辛烷、乙醇和天然气。使用了两种不同的压缩比，17：1和19：1。入口压力条件设定为提供0、1或2巴的增压压力。在较低压缩比下使用天然气作为燃料，可达到的最高IMEP为14巴。实现甚至更高IMEP的极限由高燃烧速率和高高峰压力设定。以天然气为燃料，对均质压燃过程进行了数值计算。计算得到的点火时刻与实验结果吻合较好。然而，数值解对天然气的组成非常敏感。（减）
The Homogeneous Charge Compression Ignition (HCCI) is the third alternative for combustion in the reciprocating engine. Here a homogeneous charge is used as in a spark-ignited engine, but the charge is compressed to autoignition as in a diesel. The main difference compared with the Spark Ignition (SI) engine is the lack of flame propagation and hence the independence from turbulence. Compared with the diesel engine, HCCI has a homogeneous charge and hence no problems associated with soot and NOdx formation. Earlier research on HCCI showed high efficiency and very low amounts of NOdx, but HC and CO were higher than in SI mode. It was not possible to achieve high IMEP values with HCCI, the limit being 5 bar. Supercharging is one way to dramatically increase IMEP. The influence of supercharging on HCCI was therefore experimentally investigated. Three different fuels were used during the experiments: iso-octane, ethanol and natural gas. Two different compression ratios were used, 17:1 and 19:1. The inlet pressure conditions were set to give 0, 1, or 2 bar of boost pressure. The highest attainable IMEP was 14 bar using natural gas as fuel at the lower compression ratio. The limit in achieving even higher IMEP was set by the high rate of combustion and a high peak pressure. Numerical calculations of the HCCI process have been performed for natural gas as fuel. The calculated ignition timings agreed well with the experimental findings. The numerical solution is, however, very sensitive to the composition of the natural gas. (Less)