Combustion visualization and experimental study on spark induced compression ignition (SICI) in gasoline HCCI engines

Wang, Zhi; He, Xu; Wang, Jianxin; Shuai, Shijin; Xu, Fan; Yang, Dong

doi:10.1016/j.enconman.2009.11.029

Cited by 71 publications

(25 citation statements)

References 18 publications

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“…1(b). Compared to the traditional SI combustion, the SI-CAI hybrid combustion, also known as spark assisted compression ignition (SACI), shows a higher thermal efficiency and lower NOx emission, while it obtains a lower maximum rate of pressure rise and higher load operation range compared to the pure CAI combustion [6]. In addition, this hybrid combustion concept can be used to bridge pure SI mode and CAI mode [3,[7][8][9][10].…”

Section: Introductionmentioning

confidence: 98%

Effect of piston shapes and fuel injection strategies on stoichiometric stratified flame ignition (SFI) hybrid combustion in a PFI/DI gasoline engine by numerical simulations

Wang

Zhao

Xie

2015

Energy Conversion and Management

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a b s t r a c tIn this research, the stratified flame ignition (SFI) hybrid combustion process was proposed to enhance the control of SI-CAI hybrid combustion and moderate the maximum pressure rise rate (PRR max ) by the combination of port fuel injection (PFI) and direct injection (DI). The effect of the stratified flame formed by different piston shapes, start of direct injection (SOI) timings and direct injection ratios (r DI ) on the stoichiometric SFI hybrid combustion and heat release process was studied using the three-dimensional computational fluid dynamics (3-D CFD) simulations. The spark ignited flame propagation near the spark plug and the auto-ignition heat release process of the diluted mixture were modelled in the framework of 3-Zones Extended Coherent Flame Model (ECFM3Z) by the extended coherent flame model and tabulated auto-ignition chemistry of a 4-component gasoline surrogate, respectively. The operating load of indicated mean effective pressure (IMEP) 3.6 bar was selected to represent a typical part-load operation. The sweep of the spark timing (ST) was performed for different pistons, SOI timings and direct injection ratios. The SFI hybrid combustion process with the same combustion phasing was investigated in details. The optimal stratified mixture pattern, characterized with the central rich mixture around spark plug and stratified lean mixture at the peripheral region, formed by the newly designed Piston A and B effectively lowers the PRR max with a slight deterioration of IMEP. The later SOI timing advances the crank angle of 50% total heat release (CA50) and significantly reduces the PRR max with a little deterioration of IMEP. As the direct injection ratio is increased, both the PRR max and IMEP decrease. During the SFI hybrid heat release process, spark timing is effective to control CA50, IMEP and PRR max regardless the piston shapes, SOI timings and direct injection ratios. However, the sensitivity of SFI hybrid combustion to the stratified mixture varies with the spark timing. The reduction of the PRR max caused by the stratified flame enables the advance of spark timing to achieve maximum IMEP.

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Section: Introductionmentioning

confidence: 98%

Effect of piston shapes and fuel injection strategies on stoichiometric stratified flame ignition (SFI) hybrid combustion in a PFI/DI gasoline engine by numerical simulations

Wang

Zhao

Xie

2015

Energy Conversion and Management

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“…Ever since Onishi [1] and Najt [2] proposed similar concepts of ATAC (active-thermal atmosphere combustion) on a two-stroke engine and HCCI (Homogeneous Charge Compression Ignition) on a four-stroke engine, this combustion mode has been widely investigated for more than three decades [3,4]. Even though HCCI exhibits advantages in reducing NO x and soot emissions simultaneously with a relatively high efficiency, the control of the combustion phase and the unacceptable pressure rise rate at high loads limit HCCI to be used in product engines.…”

Section: Introductionmentioning

confidence: 99%

Combustion and emission characteristics of Multiple Premixed Compression Ignition (MPCI) fuelled with naphtha and gasoline in wide load range

Wang

Shuai

et al. 2014

Energy Conversion and Management

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“…However, HCCI faces challenges of the difficult combustion control and narrow operating ranges [1]. Spark ignition-compression ignition (SI-CI) is a hybrid combustion and has become a promising mode in gasoline engines with high efficiency [2][3][4][5][6][7][8][9][10][11][12]. SI-CI can be divided into two categories [10].…”

Section: Introductionmentioning

confidence: 99%

An optical study of in-cylinder CH2O and OH chemiluminescence in flame-induced reaction front propagation using high speed imaging

Wang

Jiang

et al. 2014

Fuel

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Combustion visualization and experimental study on spark induced compression ignition (SICI) in gasoline HCCI engines

Cited by 71 publications

References 18 publications

Effect of piston shapes and fuel injection strategies on stoichiometric stratified flame ignition (SFI) hybrid combustion in a PFI/DI gasoline engine by numerical simulations

Effect of piston shapes and fuel injection strategies on stoichiometric stratified flame ignition (SFI) hybrid combustion in a PFI/DI gasoline engine by numerical simulations

Combustion and emission characteristics of Multiple Premixed Compression Ignition (MPCI) fuelled with naphtha and gasoline in wide load range

An optical study of in-cylinder CH2O and OH chemiluminescence in flame-induced reaction front propagation using high speed imaging

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