Review on the management of RCCI engines

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• 作者：Jing Li^a ; Wenming Yang^b ; ^{mpeywm@nus.edu.sg} ; Dezhi Zhou^b
• 关键词：ATDC ; after top dead center ; BMEP ; brake mean effective pressure ; CA50 ; crank angle of 50% heat released ; CA ; crank angle ; CDC ; conventional diesel combustion ; CI ; compression ignition ; CO ; carbon monoxide ; CRI ; common rail injector ; DDFS ; direct dual fuel stratification ; DI ; direct injector ; DICI ; direct injection compression combustion ; DME ; dimethyl ether ; DTBP ; di-tertiary butyl peroxide ; EGR ; exhaust gas recirculation ; FSC ; fast single-stage combustion ; GDI ; gasoline direct injector ; HCCI
• 刊名：Renewable and Sustainable Energy Reviews
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：69
• 期：Complete
• 页码：65-79
• 全文大小：1481 K
• 卷排序：69

文摘

RCCI (reactivity controlled compression ignition) engines are found to be capable of achieving higher thermal efficiency and ultra-low NOx and PM emissions. The reactivity controlled combustion is accomplished by creating reactivity stratification in the cylinder with the use of two fuels characterized by distinctly different cetane numbers. The low reactivity (i.e., low cetane number) fuel is firstly premixed with air and then charged into the cylinder through the intake manifold; later, the high reactivity (i.e., high cetane number) fuel is injected into the charged mixture through a direct injector. Subsequently, the reactivity stratification is formed. By strategically adjusting the ratio of two fuels and injection timings, the produced reactivity gradient is able to control the combustion phasing and mitigate the pressure rise rate, as well as the heat release rate. Alternatively, structural factors such as CR (compression ratio) and piston bowl geometries can also affect the combustion characteristics of RCCI. Besides the engine management, the fuels that could be utilized in RCCI engines are also crucial to determine the evaporation, mixing, and combustion processes. To gain a comprehensive knowledge on the state-of-the-art of RCCI combustion, detailed review on the management of RCCI engines has been presented in this paper. This review covers the up-to-date research progress of RCCI including the use of alternative fuels and cetane number improvers, and the effects of fuel ratio, different injection strategies, EGR rate, CR and bowl geometry on engine performance and emissions formation. Moreover, the controllability issues are addressed in this article.