Collaborative optimization of fuel composition and operating parameters of gasoline compression ignition (GCI) engine in a wide load range

Zhang, Pengwei; Xu, Guogang; Li, Yaopeng; Cai, Yikang; Duan, Huiquan

doi:10.1016/j.fuel.2021.122366

Cited by 12 publications

(2 citation statements)

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“…The toluene in the fuel can prolong the combustion duration and prevent extremely high pressure rise rate at high loads in Stage 1. 42 On the contrary, the proportion of toluene is close to zero in Stage 2. The proportion of iso-octane remains basically unchanged relative to Stage 1, while the proportion of n-heptane increases.…”

Section: Resultsmentioning

confidence: 96%

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Co-optimization of operating parameters, fuel composition, and piston bowl geometry of gasoline compression ignition (GCI) engine at high loads

Zhang

Duan

et al. 2023

International Journal of Engine Research

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Focusing on the gasoline compression ignition (GCI) combustion mode, the operating parameters, fuel composition, and piston bowl geometry were collaboratively optimized at high loads to improve engine performance. A meliorative genetic algorithm coupled with a three-dimensional computational fluid dynamics (CFD) program was adopted as the optimization tool. The optimal GCI combustion strategy is summarized based on the optimization results, and the key parameters affecting engine performance at high loads are further analyzed. The results show that the employment of the open-type piston bowl, high-reactivity fuel, and late start of injection (SOI) is desirable for GCI engines at high loads. Under this strategy, fuel burns in multiple stages, which can reduce the heat release rate and advance the combustion phase. The width of the piston bowl is the geometric parameter with the most notable impact on GCI combustion. Due to the weaker turbulent kinetic energy and the smaller surface area, the larger piston bowl width is conducive to diminishing the heat transfer losses of the engine and promoting the oxidation of unburned hydrocarbon (HC) emissions. Relative to the optimal case, the strategy with the open-type piston bowl, high-reactivity fuel, and early SOI can reduce fuel consumption but results in a higher in-cylinder pressure rise rate and increased ringing intensity (RI). On the contrary, the re-entrant type piston bowl, low-reactivity fuel, and late SOI can significantly reduce the pressure rise rate and RI while deteriorating thermal efficiency.

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Section: Resultsmentioning

confidence: 96%

“…The test GCI engine has been optimized in a wide load range by the authors in Zhang et al 42 In the previous optimization, 42 the total fuel energy at high loads is kept at 1800 J/cyc, and the IMEP is about 15 bar. In the present work, the relevant results are introduced for comparison, and it is named Stage 1 optimization.…”

Section: Methodsmentioning

confidence: 99%