Compression Ratio Influence on Maximum Load of a Natural Gas Fueled HCCI Engine
Compression Ratio Influence on Maximum Load of a Natural Gas Fueled HCCI Engine
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DOI：
10.4271/2002-01-0111
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发表时间：
2002-03
影响因子：
1.2
通讯作者：
Jan-ola Olsson;P. Tunestål;B. Johansson;Scott B. Fiveland;J. Agama;D. Assanis
中科院分区：
文献类型：
--
作者：
Jan-ola Olsson;P. Tunestål;B. Johansson;Scott B. Fiveland;J. Agama;D. Assanis
本文讨论了压缩比对天然气均质压燃发动机最大负荷的影响。改装后的沃尔沃TD100卡车发动机通过用氢气浓缩天然气混合物的方式进行闭环控制。论文的第一部分阐述和讨论了利用天然气中的氢气浓缩来控制燃烧时刻的潜力。以气缸压力为反馈，50%燃烧角为控制参数。全循环模拟与一些实验数据进行了比较，然后用来加强一些实验观察，涉及点火时刻、热边界条件、排放以及它们如何影响发动机的稳定性和性能。针对HCCI的固有性能和排放权衡，以及在发动机高负荷时可行工作空间的消失，讨论了HCCI常见的高负荷问题。讨论了燃烧定时限制较紧、工作点不稳定以及高负荷时的物理约束等问题，并用实验结果进行了说明。最后，讨论了高负荷压缩比对运行极限的影响，即排放峰值压力上升和气缸峰值压力。(更少)
This paper discusses the compression ratio influence on maximum load of a Natural Gas HCCI engine. A modified Volvo TD100 truck engine is controlled in a closed-loop fashion by enriching the Natural Gas mixture with Hydrogen. The first section of the paper illustrates and discusses the potential of using hydrogen enrichment of natural gas to control combustion timing. Cylinder pressure is used as the feedback and the 50 percent burn angle is the controlled parameter. Full-cycle simulation is compared to some of the experimental data and then used to enhance some of the experimental observations dealing with ignition timing, thermal boundary conditions, emissions and how they affect engine stability and performance. High load issues common to HCCI are discussed in light of the inherent performance and emissions tradeoff and the disappearance of feasible operating space at high engine loads. The problems of tighter limits for combustion timing, unstable operational points and physical constraints at high loads are discussed and illustrated by experimental results. Finally, the influence on operational limits, i.e., emissions peak pressure rise and peak cylinder pressure, from compression ratio at high load are discussed. (Less)