Controlled three-stage heat release of stratified charge compression ignition (SCCI) combustion with a two-stage primary reference fuel supply
Controlled three-stage heat release of stratified charge compression ignition (SCCI) combustion with a two-stage primary reference fuel supply
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具有两级主要参考燃料供应的分层充量压缩点火 (SCCI) 燃烧的受控三级放热
DOI：
10.1016/j.fuel.2011.01.026
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发表时间：
2011-05
期刊：
影响因子：
7.4
通讯作者：
Huang Zhen
中科院分区：
文献类型：
--
作者：
Lu Xingcai;Shen Yitao;Zhan Yinbao;Zhou Xiaoxin;Ji Libin;Yang Zheng;Huang Zhen
本文研究了分层进气压缩点火（SCCI）燃烧的放热方式及其对燃烧特性的影响。为了产生和控制燃料浓度分层、组成分层和温度分层，从进气道供应主要参考燃料或其混合物，而正庚烷在压缩冲程的上止点附近直接喷射到气缸中。为了实现可控制的分级放热并优化热效率和排放，调节重要因素，包括预混燃料性质、直喷正时、总当量比和预混比来调节放热模式。实验结果表明，在进气道喷射两级反应燃料的情况下，SCCI燃烧的放热曲线呈现出三级放热模式。缸内供油提前角对指示热效率有重要影响，供油提前角越早，指示热效率越高。应该注意的是，过度提前的燃料输送角将导致NOx排放的急剧增加。采用PRF50的进气道喷射，在较宽的预混比和当量比范围内获得了燃油效率和超低NOx排放。此外，实验结果表明，较高的预混比低至中等当量比和较小的预混比较大的当量比是优选的。最大热效率出现在具有较早CA50但燃烧持续时间较短的区域。NOx水平不仅由CA50和燃烧持续时间决定，而且还由热释放模式决定。与分级放热模式相比，以扩散燃烧为主的单级SCCI燃烧排放了相当多的NOx。
This paper discusses the heat release mode and its effect on combustion characteristics of stratified charge compression ignition (SCCI) combustion with a two-stage fuel supply. To create and control the fuel concentration stratification, composition stratification, and temperature stratification, primary reference fuels or their mixtures were supplied from the intake port, while n-heptane was directly injected into the cylinder near the top dead center of the compression stroke. To achieve a controllable staged heat release and to optimize the thermal efficiency and emissions, important factors, including premixed fuel properties, direct injection timing, the overall equivalence ratio, and the premixed ratio were tuned to modulate the heat release pattern. The experimental results revealed that, with the port fuel injection of a two-stage reaction fuel, the heat release curve of the SCCI combustion exhibits a three-stage heat release pattern. The in-cylinder fuel delivery advance angle plays an important role in the indicated thermal efficiency, and the earlier fuel delivery angle has a positive effect on the indicated thermal efficiency. It should be noted that an excessively advanced fuel delivery angle will lead to a sharp increase of NOx emissions. With the port fuel injection of PRF50, both fuel efficiency and ultra-low NOx emissions were obtained over wide ranges of the premixed ratio and the equivalence ratio. Moreover, the experimental results suggest that a higher premixed ratio for low-to-medium equivalence ratios and a smaller premixed ratio for larger equivalence ratios are preferred. The maximum thermal efficiency was observed at the zone with the earlier CA50 but with shorter burn duration. NOx levels were determined not only by CA50 and burn duration but also by the heat release mode. One-stage SCCI combustion, which was dominated by the diffusion burn, exhausted considerable NOx emissions, compared to the staged heat release mode.
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影响因子：
5.3
作者：
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通讯作者：
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影响因子：
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期刊：
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