Experimental and Simulative Investigation on Stratification Potential of Spray-Guided GDI Combustion Systems

Baecker, H; Kaufmann, André; Tichý, M.

doi:10.4271/2007-01-1407

Cited by 35 publications

(13 citation statements)

References 1 publication

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“…A piezo-type fuel injection system with an outwardly opening nozzle was applied to allow up to four injections in one cycle. The characteristics of the outwardly opening nozzle, such as the mixture formation and fuel vaporization, were reported in previous studies [22,26,27]. LPG fuel was supplied from the compressed fuel tank to the high-pressure fuel supply system at a pressure of 0.5 MPa by using a low-pressure fuel pump inside the LPG storage tank, and subsequently the fuel was fed through the high-pressure pump to the common rail.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine

et al. 2016

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Abstract:The effect of the fuel injection ratio on the combustion and emission characteristics of stratified lean mixture combustion was investigated for a spray-guided liquefied petroleum gas (LPG) direct injection engine. Inter-injection spark-ignition combustion-a specially designed combustion strategy for LPG fuel derived from a two-staged injection-was employed to maximize the improvement in thermal efficiency when combustion stability is secured. When changing the fuel injection ratio, the optimum spark advance and fuel injection timings were experimentally determined to maximize the thermal efficiency based on sweeping timings. The optimum fuel injection ratio with the highest thermal efficiency (42.76%) and stable operation was 60%/40%, with the optimization of the spark advance and fuel injection timing, because of the locally rich mixture region in the recirculation zone. NO x emissions were at their highest level with a fuel injection ratio of 60%/40% because of the high combustion temperature, and the levels of total hydrocarbon and CO emissions with 50%/50% and 60%/40% fuel injection ratios were similar, whereas emissions at 70%/30% were significantly higher because of fuel wetting and the formation of over-lean mixture.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine

et al. 2016

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“…Fuel evaporations cool down the mixture before ignition and allows for the higher compression ratios which leads to higher thermal efficiency (Schwarz, Schünemann et al 2006;Baecker, Kaufmann et al 2007;Kim, Kim et al 2008;Postrioti, Bosi et al 2012). In the case of stratified mode operation, when the mixture is not homogenous inside the combustion chamber, pumping loss is eliminated by reducing throttling (Badami, Bevilacqua et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of GDI Single-hole and Multi-hole Injector Sprays with Comparison of Numerical Break-up Models and Coefficients

zamani

Hosseini

Afshin

et al. 2016

JAFM

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In the present study the fuel spray of a gasoline direct injected engine with multi-hole injector is simulated. Simulation inputs data, injection flow rate and spray cone angle are obtained from previous experimental studies. Log-normal distribution with different standard deviation is used for initial droplet size as the primary break-up model in order to reach the agreement between experimental and calculated spray tip penetration.As the first step, only one plume of spray injected into a quiescent air environment is simulated and validated by varying break-up model and standard deviation. Then, with coefficient obtained from the single jet simulation all six spray jets are simulated based on the injector nozzles geometry. The comparison between single-jet simulation and multi-jet simulation shows that validated model coefficients for the single-jet spray cannot be used for multi-jet spray simulation without significant modifications due to adjacent jet interaction and pressure drag. A set of new coefficients for the multi-jet spray is presented

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“…To meet present energy demands and increasingly stringent engine emission regulations, it is essential to enhance the economy of gasoline engines and reduce their emissions (Guo et al, 2006;Martínez-Morales et al, 2013). Lean-burn technology is being developed for future engines to achieve a pronounced improvement in fuel economy (Schwarz et al, 2006;Baecker et al, 2007). The major drawback of lean-burn gasoline engines is the inefficient NO x conversion of the conventional three way catalyst (TWC) under ultra lean air/fuel ratio (AFR) conditions (König et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Effect of rich air/fuel ratio and temperature on NO x desorption of lean NO x trap

Liu

Zhang

et al. 2013

J. Zhejiang Univ. Sci. A

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An experimental and model-based study of the effect of rich air/fuel ratios (AFRs) and temperature on the NO x slip of a lean NO x trap (LNT) was conducted in a lean-burn gasoline engine with an LNT after-treatment system. The emissions of the engine test bench and the inlet temperature of the LNT were used as the major inlet boundary conditions of the LNT. The engine periodically operated between a constant lean AFR of 23 with alterable rich AFRs of 10, 11, 12, 13, and 14. A decrease in the rich AFR of the engine strengthened the desorption atmosphere in the LNT, an effect closely related to the number of reductants, and further heightened the NO x desorption of the LNT, but with a penalty in fuel consumption. To eliminate that penalty, the inlet boundary conditions of the LNT were varied by adjusting the inlet temperature within a range between 200 °C and 400 °C. An increase in inlet temperature heightened the NO x desorption of the LNT, and a NO x breakthrough occurred after the inlet temperature exceeded 390 °C. To control NO x breakthrough, the inlet temperature can be adjusted to offset the strong desorption atmosphere in the LNT commonly created by a rich AFR.

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Experimental and Simulative Investigation on Stratification Potential of Spray-Guided GDI Combustion Systems

Cited by 35 publications

References 1 publication

Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine

Combustion and Emission Characteristics According to the Fuel Injection Ratio of an Ultra-Lean LPG Direct Injection Engine

Large Eddy Simulation of GDI Single-hole and Multi-hole Injector Sprays with Comparison of Numerical Break-up Models and Coefficients

Effect of rich air/fuel ratio and temperature on NO x desorption of lean NO x trap

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