Control of harmful hydrocarbon species in the exhaust of modern advanced GDI engines

Hasan, Ahmad O.; Abu-Jrai, A.; Turner, Dale; Tsolakis, Athanasios; Xu, Hongming; Golunski, Stanislaw E.; Herreros, José Martín

doi:10.1016/j.atmosenv.2016.01.033

Cited by 17 publications

(8 citation statements)

References 38 publications

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“…The in-cylinder pressure increases with EGR, and as a result, the fuel is forced into the piston ring crevices that then is released as unburnt HC emissions during the exhaust stroke [7].…”

Section: Gaseous Emissionsmentioning

confidence: 99%

“…The main sources of PM formation in GDI engines are identified as fuel piston wetting, injector fuel deposits and inadequate air-fuel mixing. Consequently, the diffusive combustion of rich-in-fuel areas promotes PM formation [5,6], and also wall wetting by fuel impingement also produces an increment of unburned hydrocarbons (HCs) and carbon monoxide (CO) due to a significant grade of incomplete combustion [7,8]. For this reason, emission standards such as Euro 6c, which includes a strict limit of 6x10 11 particles per kilometer and comes into force in September 2017 [9], are boosting the development of new technologies to reduce emissions in GDI.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Butanol-gasoline blend and exhaust gas recirculation, impact on GDI engine emissions

Hergueta

Bogarra

Tsolakis

et al. 2017

Fuel

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“…The in-cylinder pressure increases with EGR, and as a result, the fuel is forced into the piston ring crevices that then is released as unburnt HC emissions during the exhaust stroke [7].…”

Section: Gaseous Emissionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Butanol-gasoline blend and exhaust gas recirculation, impact on GDI engine emissions

Hergueta

Bogarra

Tsolakis

et al. 2017

Fuel

Self Cite

View full text Add to dashboard Cite

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“…Diesel engines are a type of lean burn engine, operating at upper stoichiometric air-to-fuel ratios (A/F>14.7/1), which grew in popularity at the end of 20 th century as they offered higher fuel efficiency and less CO 2 emissions respect to gasoline engines [1]. However, these engines show a highly relevant drawback since they generate large amounts of NOx and soot [2,3].…”

Section: Introductionmentioning

confidence: 99%

BaTi0.8B0.2O3 (B = Mn, Fe, Co, Cu) LNT Catalysts: Effect of Partial Ti Substitution on NOx Storage Capacity

et al. 2019

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The effect of partial Ti substitution by Mn, Fe, Co, or Cu on the NOx storage capacity (NSC) of a BaTi0.8B0.2O3 lean NOx trap (LNT) catalyst has been analyzed. The BaTi0.8B0.2O3 catalysts were prepared using the Pechini’s sol–gel method for aqueous media. The characterization of the catalysts (BET, ICP-OES, XRD and XPS) reveals that: i) the partial substitution of Ti by Mn, Co, or Fe changes the perovskite structure from tetragonal to cubic, whilst Cu distorts the raw tetragonal structure and promotes the segregation of Ba2TiO4 (which is an active phase for NOx storage) as a minority phase and ii) the amount of oxygen vacancies increases after partial Ti substitution, with the BaTi0.8Cu0.2O3 catalyst featuring the largest amount. The BaTi0.8Cu0.2O3 catalyst shows the highest NSC at 400 °C, based on NOx storage cyclic tests, which is within the range of highly active noble metal-based catalysts.

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“…Furthermore, because of this lean combustion and the position the injector, the mixture control may not depend on throttling and there is an indication that pumping loss due to cycle work could be reduced compared with traditional PFI engine [2,7,8].…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics (CFD) Modelling of Mixture Formation in Gasoline Direct Injection (GDI) Engine

Amedorme

Apodi

2019

JERR

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Automotive engine faces stringent regulations on emission with improved fuel consumption. As such, the Gasoline Direct Injection (GDI) engines which have the potential to meet these requirements are being improved on especially the mixture formation to the burning of the mixture. In GDI, late injection compared with early injection scheme generates charge stratification which contributes to the optimised fuel consumption and combustion. As a result, this strategy in GDI engines is considered to be promising with increasing research focus. This paper aims at evaluating the computational fluids dynamics (CFD) modelling of two-phase transient injection process in generic GDI engines with the late injection to study the features of fuel atomisation process, injection velocity and its influence on turbulence. The commercial CFD code Star CCM+ was used to perform this simulation due to its advanced polyhedral mesh technology and the user-friendly interface. Transient liquid and gas flow inside the combustion chamber was simulated using the Eulerian multiphase segregated flow model with k-epsilon turbulence. The contour plots show that during the injection period turbulence for each phase was independent of the spray shape predicted to be asymmetric under non-vaporisation conditions. In addition, increasing injection velocity of liquid fuel causes stronger turbulence for the liquid phase. The results also show that the variation of turbulence for gas-phase is mainly centred in the region of the inlet during the injection process and non-homogenous turbulent characteristics were observed for the late injection with the volume fraction of the liquid phase also seen to be asymmetric.

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Control of harmful hydrocarbon species in the exhaust of modern advanced GDI engines

Cited by 17 publications

References 38 publications

Butanol-gasoline blend and exhaust gas recirculation, impact on GDI engine emissions

Butanol-gasoline blend and exhaust gas recirculation, impact on GDI engine emissions

BaTi0.8B0.2O3 (B = Mn, Fe, Co, Cu) LNT Catalysts: Effect of Partial Ti Substitution on NOx Storage Capacity

Computational Fluid Dynamics (CFD) Modelling of Mixture Formation in Gasoline Direct Injection (GDI) Engine

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