Numerical Investigation on the Effects of Bore Reduction in a High Performance Turbocharged GDI Engine. 3D Investigation of Knock Tendency

Severi, Elena; D'Adamo, Alessandro; Berni, Fabio; Breda, Sebastiano; Lugli, Mattia; Mattarelli, Enrico

doi:10.1016/j.egypro.2015.12.094

Cited by 25 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cooperating of this new design via advancing of inlet valve closing (IVC) and employing turbocharger was introduced as an effective way to improve SI engines performance. Severi et al (2015) [32] asserted that 20% displacement volume reduction besides providing right-size engine maximum power of studied GDI engine is achievable via 11% piston bore reduction and using both engine boosting and spark advancing, in a numerical investigation. A light duty downsized diesel engine, called z-engine, was developed utilizing homogenous charge compression ignition (HCCI) mode in high load operation by Kuleshov et al [33] and it is asserted that less NOx emission was produced in this way.…”

Section: Base Designmentioning

confidence: 98%

Engine Downsizing; Global Approach to Reduce Emissions: A World-Wide Review

Namar

Jahanian

Shafaghat

et al. 2021

HighTech. Innov. J.

View full text Add to dashboard Cite

Engine downsizing is a promising method to reduce emissions and fuel consumption of internal combustion engines. The main concept is reducing engine displacement volume keeping needed output characteristics unchanged. The issue became one of the most filed of interest in recent years after the International Energy Agency defined a target of 50 % reduction in global average emissions by the year 2030. In this review paper, different aspects of researchers’ efforts on engine downsizing are configured and due to overlaps, categorized into five main areas. Each category is discussed thoroughly and recent works are pointed. The global attention into these categories, countries involved and the trend changed in recent four years are presented in details. Doi: 10.28991/HIJ-2021-02-04-010 Full Text: PDF

show abstract

Section: Base Designmentioning

confidence: 98%

Engine Downsizing; Global Approach to Reduce Emissions: A World-Wide Review

Namar

Jahanian

Shafaghat

et al. 2021

HighTech. Innov. J.

View full text Add to dashboard Cite

show abstract

“…In order to improve the fuel chemistry modeling thus enhancing the predictive capabilities of the combustion model, a dedicated part-load laminar flame speed correlation is provided via user subroutine. 55,56 Such correlation is developed starting from the chemical characteristics provided by the fuel supplier. In addition, by means of a methodology previously developed by the authors, the correlation is extended to cover a wide range of equivalence ratio, thus providing a reliable estimation even in case of highly stratified charge.…”

Section: D Modelmentioning

confidence: 99%

“…In fact all the cases are characterized by a mean equivalence ratio close to unity, which roughly corresponds to the value where the maximum of laminar flame speed is expected for a gasoline, as widely reported in literature. 55,70,71 On the contrary, a strongly non-homogeneous mixture leads to point-wise values of ϕ remarkably different than the average, thus to laminar flame speeds far from the maximum. The comparison with the experiments reveals that the effect of the SOI sweep is mildly overestimated.…”

Section: Combustion Validationmentioning

confidence: 99%

Modeling of gaseous emissions and soot in 3D-CFD in-cylinder simulations of spark-ignition engines: A methodology to correlate numerical results and experimental data

Berni

Pessina

Paltrinieri

et al. 2022

International Journal of Engine Research

Self Cite

View full text Add to dashboard Cite

In order to reduce development costs and time-to market, 1D and 3D CFD tools can support engine design providing reliable estimations of the tailpipe emissions. In particular, 3D-CFD in-cylinder simulations can evaluate formation of both soot and gaseous pollutants inside the combustion chamber. The main issue in such kind of simulations is the validation against experimental findings. In fact, the complexity of the emission measurements does not allow a straightforward one-to-one comparison between numerical and experimental results. Therefore the present paper aims at providing, on the one hand, a robust numerical framework for both gaseous and solid emissions, on the other hand a dedicated post-processing for a fair comparison between simulations and experiments. From a numerical standpoint, a simplified approach is dedicated to gaseous emissions, while a more detailed one is reserved to soot modeling. The latter is based on the Sectional Method, whose reaction rates are tabulated following 0D chemical kinetic simulations of a purposely designed surrogate in a constant pressure reactor. Simulations and experiments proposed in the present analysis are referred to a high-performance turbocharged direct-injection spark-ignition engine operated at part-load and low rpms. On equal performance, revving speed and mean mixture quality, different injection timings are investigated. The developed numerical approach and post-processing ensure a good agreement between simulations and experiments.

show abstract

“…Cooperating of this new design via advancing of Inlet Valve Closing (IVC) and employing turbocharger was introduced as an effective way to improve SI engines performance. In 2015, Severi et al [27] asserted that 20% displacement volume reduction besides providing right-size engine maximum power of studied GDI engine is achievable via 11% piston bore reduction and using both engine boosting and spark advancing, in a numerical investigation. The concept of designing a boosted uni-flow scavenged direct injection gasoline engine to achieve more than 50% downsizing is demonstrated by Ma and Zhao [28] for a two stroke engine.…”

Section: Introductionmentioning

confidence: 99%