Performance of straight-run naphtha single- and two-stage combustion modes from low to high load
Performance of straight-run naphtha single- and two-stage combustion modes from low to high load
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DOI：
10.1177/1468087413488113
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发表时间：
2013-09
影响因子：
2.5
通讯作者：
Hongqiang Yang;S. Shuai;Zhi Wang;Jian-xin Wang;Hongming Xu
中科院分区：
文献类型：
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作者：
Hongqiang Yang;S. Shuai;Zhi Wang;Jian-xin Wang;Hongming Xu
在一台单缸柴油机上，从低负荷到高负荷，对直馏石脑油单级放热和两级放热的双喷射策略进行了试验研究。两级燃烧策略是通过在压缩上止点附近的分裂喷雾和燃烧事件来实现的，具有“先喷射后燃烧，先燃烧后喷射”的显著特点，以保证预混合压缩着火。单级燃烧是通过“喷雾-喷雾-燃烧”过程实现的，燃烧开始与喷射结束分开。直馏石脑油的研究辛烷值为58.8，试验发动机的压缩比和排量分别为16.7和0.5L采用双喷射策略产生不同喷射时刻的单级和双级燃烧模式。在本研究中，两级燃烧模式的NOx和总烃排放均低于单一放热模式，且在较高负荷下更容易产生两级燃烧模式。柴油也采用直馏石脑油单次放热方式进行了双次喷射试验，但柴油的燃油经济性和排放性能均低于直馏石脑油。
Double injection strategies with single-stage heat release and two-stage heat release process of straight-run naphtha were investigated on a single-cylinder diesel engine from low to high load. The two-stage combustion strategy is realized by split spray and combustion events around the compression top dead center with a dominant feature of “Combust After Injection End, Inject After Combustion End” to ensure the premixed compression ignition. The single-stage combustion is realized by the “spray–spray–combustion” process with the start of combustion separated from the end of injection. The straight-run naphtha has a research octane number of 58.8, and the compression ratio and displacement of the test engine are 16.7 and 0.5 L. Double injection strategy is used to generate the single- and two-stage combustion modes with different injection timing. NOx and total hydrocarbon emissions of the two-stage combustion mode are lower than that of single heat release mode in this study, and it is much easier to produce two-stage combustion mode at higher engine load. Diesel is also tested under double injection strategy just as the single heat release mode of straight-run naphtha, but the fuel efficiency and emission performance are worse than that of naphtha.