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Fuel design real-time to control HCCI combustion

机译：实时进行燃料设计以控制HCCI燃烧

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摘要

In order to achieve lower emissions and extensive load in the homogeneous charge compression ignition (HCCI) engine system, a novel fuel design concept that high-octane number fuel and high-cetane number fuel are mixed real-time to control HCCI combustion is proposed in this study. HCCI combustion fueled with iso-octane-heptane mixtures controlled real-time on a single-cylinder HCCI combustion engine is studied. The test results show that the equivalence ratio of n-heptane in mixtures decides ignition and controls the combustion phase of HCCI combustion. The addition of iso-octane extends knocking limit in equivalence ratio somewhat, but knocking occurrence mainly depends on the total concentration of mixture. Although operating range in equivalence ratio becomes narrow with the increasing proportion of iso-octane, the maximum load of HCCI combustion fueled with iso-octane-heptane mixtures controlled real-time is increased about 80 percent more than that of pure n-heptane. When iso-octane/ n-heptane mixtures are controlled in optimized method, it is proved that the load of HCCI combustion can be fully extended and emissions can be decreased remarkably, while at the same time the higher indicated thermal efficiencies are obtained over the extensive operation range.
机译：为了在均质充量压燃（HCCI）发动机系统中实现更低的排放和更大的负荷，提出了一种新颖的燃料设计概念，即将高辛烷值燃料和高十六烷值燃料实时混合以控制HCCI燃烧。这项研究。研究了在单缸HCCI内燃机上实时控制的以异辛烷/正庚烷混合物为燃料的HCCI燃烧。试验结果表明，混合物中正庚烷的当量比决定着火并控制HCCI燃烧的燃烧阶段。异辛烷的加入在某种程度上扩大了当量比的爆震极限，但爆震的发生主要取决于混合物的总浓度。尽管随着异辛烷比例的增加，当量比的工作范围变窄，但实时控制的异辛烷/正庚烷混合物的HCCI燃烧最大负荷比纯正庚烷增加了约80％ 。通过优化方法控制异辛烷/正庚烷的混合物，可以证明HCCI燃烧的负荷可以充分扩展，并且可以显着降低排放，同时在更大范围内可以获得更高的指示热效率。操作范围。

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