An Experimental Study on the Combustion and Emission Characteristics of a Stratified Charge Compression Ignition (SCCI) Engine
An Experimental Study on the Combustion and Emission Characteristics of a Stratified Charge Compression Ignition (SCCI) Engine
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DOI：
10.1021/ef060638h
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发表时间：
2007-05
期刊：
影响因子：
5.3
通讯作者：
C. -. Lee;K. Lee
中科院分区：
文献类型：
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作者：
C. -. Lee;K. Lee
分层充量压燃燃烧技术是为了扩大均质充量压燃燃烧的工作范围而发展起来的一种燃烧技术，具有改善燃油经济性和降低排放的良好潜力。本文在一台单缸直喷汽油机上研究了SCCI燃烧和排放特性。从实验结果中，我们阐明了空燃比，进气温度，喷射定时，包括早期和后期喷射上可达到的SCCI燃烧区的影响。进气过程中的喷油正时是影响SCCI工作区域扩展的重要参数。分层混合物形成的效果可用于在不同发动机速度和压缩比条件下扩展合适SCCI燃烧的操作范围。在这项研究中，我们发现，较高的进气温度是非常有效的蒸发喷射燃料，这种效果有助于加强SCCI燃烧。进气温度可以通过压缩比来控制。最后，喷油定时和分层混合气的形成对实现稳定燃烧和扩大工作范围起着重要作用。
Stratified charge compression ignition (SCCI) combustion, which is developed to extend the homogeneous charge compression ignition operating range, has a good potential to improve fuel economy and reduce emissions. In this study, SCCI combustion and emissions characteristics were investigated in a single-cylinder gasoline engine with a direct-injection system. From the experimental results, we elucidated the effects of air -fuel ratio, intake temperature, and injection timing including early and late injection on the attainable SCCI combustion region. Injection timing during the intake process was found to be an important parameter that affects the extension of the SCCI operating region. The effects of stratified mixture formation can be utilized to extend the operating range for suitable SCCI combustion under different engine speeds and compression ratio conditions. In this study, we found that the higher intake temperature is very effective to evaporate the injected fuel, and this effect helps to enhance SCCI combustion. The intake temperature can be controlled by the compression ratio. Finally, the injection timing and stratified mixture formation played an important role in achieving stable combustion and extending the operating range.