Development and Optimization of a Small-Displacement Spark-Ignition Direct-Injection Engine - Stratified Operation

Lippert, Andreas; Tahry, S. H. El; Huebler, M. S.; Parrish, Scott; Inoue, Hiroaki; Noyori, Takahiro; Nakama, Kenjiro; Abe, Toshihisa

doi:10.4271/2004-01-0033

Cited by 28 publications

(10 citation statements)

References 25 publications

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“…They also offer the highest possible flexibility in adapting the spray pattern layout to a particular combustion chamber design. The investigations of (Ortmann et al, 2001;Lippert et al,2004;Mitroglou et al, 2006Mitroglou et al, , 2007 on multi-hole injectors for gasoline engines confirmed the improved stability of the spray at elevated chamber pressures relative to that of swirl injectors. Also, enhanced air entrainment has been observed as a result of an enlarged surface area produced by separated spray jets, enhanced flexibility to direct the sprays towards the proximity of the spark plug and improved matching with the injector, generated spray and combustion chamber design.…”

Section: Introductionmentioning

confidence: 85%

Effects of intake flow on the spray structure of a multi-hole injector in a DISI engine

Kim

Nouri

Yan

et al. 2009

Int.J Automot. Technol.

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This is the accepted version of the paper.This version of the publication may differ from the final published version. ABSTRACT−The spray characteristics of a 6-hole injector were examined in a single cylinder optical direct injection spark ignition engine. The effects of injection timing, in-cylinder charge motion, fuel injection pressure, and coolant temperature were investigated using the 2-dimensional Mie scattering technique. It was confirmed that the incylinder charge motion played a major role in the fuel spray distribution during the induction stroke while injection timing had to be carefully considered at high injection pressures during the compression stroke to prevent spray impingement on the piston. Permanent

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Section: Introductionmentioning

confidence: 85%

Effects of intake flow on the spray structure of a multi-hole injector in a DISI engine

Kim

Nouri

Yan

et al. 2009

Int.J Automot. Technol.

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“…In this study, the stratified flame ignition (SFI) hybrid combustion was proposed to generate a stable flame kernel and hence control the heat release process of SI-CAI hybrid combustion by dual-injection strategy at stratified charge operations. The stratified flame kernel is formed around the spark plug by fuel stratification in the same way as a stratified charge DI gasoline engine through the appropriate direct injection strategy in combination with a suitable bowl piston [29][30][31][32][33]. The piston shape should be well designed to induce the direct injected fuel to the vicinity of spark plug.…”

Section: Introductionmentioning

confidence: 99%

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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“…The specifications of the fuel injector are as shown in Table 2. This type of fuel injector is considered because limited investigations are done with it [19,20]. It gives a stable spray structure even at elevated ambient pressure unlike swirl injectors [22].…”

Section: Fuel Injectormentioning

confidence: 99%

Effect of piston shape on in-cylinder flows and air–fuel interaction in a direct injection spark ignition engine – A CFD analysis

Harshavardhan

Mallikarjuna

2015

Energy

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Development and Optimization of a Small-Displacement Spark-Ignition Direct-Injection Engine - Stratified Operation

Cited by 28 publications

References 25 publications

Effects of intake flow on the spray structure of a multi-hole injector in a DISI engine

Effects of intake flow on the spray structure of a multi-hole injector in a DISI engine

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 shape on in-cylinder flows and air–fuel interaction in a direct injection spark ignition engine – A CFD analysis

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