CFD Modeling of Gas Exchange, Fuel-Air Mixing and Combustion in Gasoline Direct-Injection Engines

2019-24-0095

09/09/2019

Features
Event
14th International Conference on Engines & Vehicles
Authors Abstract
Content
Gasoline, direct injection engines represent one of the most widely adopted powertrain for passenger cars. However, further development efforts are necessary to meet the future fuel consumption and emission standards imposing an efficiency increase and a reduction of particulate matter emissions. Within this context, computational fluid dynamics is nowadays a consolidated tool to support engine design; this work is focused on the development of a set of CFD models for the prediction of combustion in modern GDI engines. The one-equation Weller model coupled with a zero-dimensional approach to handle initial flame kernel growth was applied to predict flame propagation. To account for mixture fraction fluctuations which might lead to the presence of soot precursor species, burned gas chemical composition is computed using tabulated kinetics with a presumed probability density function. Assessment of the combustion model was done with experimental data of flame radius evolution at different operating conditions. Afterwards, simulations were carried out for a turbocharged gasoline, direct-injection engine with a variable valve actuation. Different operating points were considered including variations of speed and load: a detailed comparison was performed between computed and experimental data of in-cylinder pressure and apparent heat release rate.
Meta TagsDetails
DOI
https://doi.org/10.4271/2019-24-0095
Pages
16
Citation
Lucchini, T., D'Errico, G., Paredi, D., Sforza, L. et al., "CFD Modeling of Gas Exchange, Fuel-Air Mixing and Combustion in Gasoline Direct-Injection Engines," SAE Technical Paper 2019-24-0095, 2019, https://doi.org/10.4271/2019-24-0095.
Additional Details
Publisher
Published
Sep 9, 2019
Product Code
2019-24-0095
Content Type
Technical Paper
Language
English