An experimental study on a boosted gasoline HCCI engine under different direct fuel injection strategies

Hunicz, Jacek; Gęca, Michał; Kordos, P.; Komsta, H.

doi:10.1016/j.expthermflusci.2014.12.014

Cited by 31 publications

(27 citation statements)

References 45 publications

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“…The valves lifts were adjusted with the hydraulic mechanism described in details in ref. [7]. The fully variable valvetrain allowed the authors to obtain internal exhaust gas re-circulation using the NVO technique.…”

Section: Experimental Facility and Data Analysismentioning

confidence: 99%

See 1 more Smart Citation

Experimental and Numerical Investigation into the Thermal Effects of Direct Fuel Injection in HCCI Engine

Hunicz¹,

Gęca²,

Mikulski³

et al. 2017

World Congress on Momentum, Heat and Mass Transfer

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-In this paper Homogeneous Charge Compression Ignition (HCCI) engine utilising Negative Valve Overlap (NVO) injection of gasoline was subjected to combined experimental and numerical investigation. The thermal effects of direct fuel injection during NVO and its impact on intake process as well as main event compression temperature histories were investigated in this study.The research was performed for a constant speed of 1500 rev/min and two main event excess air ratios (stoichiometric  = 1 and lean  = 1.2). Recorded in-cylinder pressure signal served as the basis of numerical calculations performed in AVL-BOOST software. It was shown that NVO injection timing to some extent can be used as a measure to control combustion phasing. Injection timing influenced combustion phasing through changing the gasoline residence time and temperature of trapped exhaust gasses during the NVO period. At the same time important correlations between cylinder thermal conditions in NVO and intake valve flow were identified.

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Section: Experimental Facility and Data Analysismentioning

confidence: 99%

“…The combustion chamber design and injector characteristics were thoroughly described in ref. [7]. The engine control system was based on in-house PC software connected with a real-time timing module to govern injection timings and durations as well as spark generation.…”

Section: Experimental Facility and Data Analysismentioning

confidence: 99%

Experimental and Numerical Investigation into the Thermal Effects of Direct Fuel Injection in HCCI Engine

Hunicz¹,

Gęca²,

Mikulski³

et al. 2017

World Congress on Momentum, Heat and Mass Transfer

Self Cite

View full text Add to dashboard Cite

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“…Other works such as those of Ishida et al [19] and Minani et al [20] obtained NO x and consumption reductions but recommended employing a small amount of pilot quantity in order to maintain soot emissions. In addition to these aforementioned works based on diesel engines, other similar studies were realized using biodiesel [21], gasoline [22][23][24], dual fuel [25-28] and other fuels [29][30][31][32][33][34].Numerical simulations also provide interesting information to analyze multiple injections. Particularly, in the field of Computational Fluid Dynamics (CFD), one can refer to the work of Lechner et al [35], who analyzed advanced injection strategies to achieve partially premixed combustion in a diesel engine; Sun and Reitz [36], who analyzed injection strategies to optimize two-stage combustion; Verbiezen et al [37], who analyzed the effect of injection timing; Zehni and Jafarmadar [38], who analyzed the effect of split injection in a direct-injection diesel engine; Abdullah et al [39], who analyzed the effect of injection pressure; Coskun et al [40], who analyzed second injection timings; Wang et al [41], who analyzed several fuel injection strategies on a gasoline engine; Zhaojie et al [42], who analyzed two-stage fuel injection with EGR; Lamas et al [43,44], who analyzed several configurations of pilot injections; and Sencic [45], who analyzed alternative injection patterns.Despite this literature about multiple injections, it is important to develop a reliable tool to characterize the most appropriate injection pattern.…”

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confidence: 99%

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confidence: 99%

Selection of an Appropriate Pre-Injection Pattern in a Marine Diesel Engine Through a Multiple-Criteria Decision Making Approach

Galdo

Castro-Santos

Vidal³

2020

Applied Sciences

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In the present work, a numerical model was developed to analyze a commercial diesel engine. The adequacy of this model was validated using experimental results. This model was employed to study several pre-injection strategies. Particularly, the pre-injection rate, duration and starting instant were analyzed in the ranges 5% to 25%, 1° to 5° and −22° to −18°, respectively. The effect on consumption and emissions of NOx, CO, and HC wereas evaluated. Since some of these configurations have opposite effects on consumption and/or emissions, it is necessary to develop a formal tool to characterize the most appropriate injection pattern. To this end, a multiple-criteria decision making approach was employed. It was found that the injection duration must remain as low as possible due to significant reductions in NOx. The most appropriate injection pattern resulted 1° pre-injection duration, 20% pre-injection rate, and −19° pre-injection starting instant. This configuration leads to increments of 6.7% in consumption, 3.47% in CO, and 3.83% in HC but reduces NOx by 34.67% in comparison with the case without pre-injection.

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“…The approaches to reducing PRR at elevated engine loads are increased fuel dilution by high degrees of boost and/or high exhaust gas re-circulation (EGR) rates [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Mixture Stratification on Combustion and Emissions of Boosted Controlled Auto-Ignition Engines

2017

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Abstract:The stratification of in-cylinder mixtures appears to be an effective method for managing the combustion process in controlled auto-ignition (CAI) engines. Stratification can be achieved and controlled using various injection strategies such as split fuel injection and the introduction of a portion of fuel directly before the start of combustion. This study investigates the effect of injection timing and the amount of fuel injected for stratification on the combustion and emissions in CAI engine. The experimental research was performed on a single cylinder engine with direct gasoline injection. CAI combustion was achieved using negative valve overlap and exhaust gas trapping. The experiments were performed at constant engine fueling. Intake boost was applied to control the excess air ratio. The results show that the application of the late injection strategy has a significant effect on the heat release process. In general, the later the injection is and the more fuel is injected for stratification, the earlier the auto-ignition occurs. However, the experimental findings reveal that the effect of stratification on combustion duration is much more complex. Changes in combustion are reflected in NO X emissions. The attainable level of stratification is limited by the excessive emission of unburned hydrocarbons, CO and soot.

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An experimental study on a boosted gasoline HCCI engine under different direct fuel injection strategies

Cited by 31 publications

References 45 publications

Experimental and Numerical Investigation into the Thermal Effects of Direct Fuel Injection in HCCI Engine

Experimental and Numerical Investigation into the Thermal Effects of Direct Fuel Injection in HCCI Engine

Selection of an Appropriate Pre-Injection Pattern in a Marine Diesel Engine Through a Multiple-Criteria Decision Making Approach

Effects of Mixture Stratification on Combustion and Emissions of Boosted Controlled Auto-Ignition Engines

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