A New CFD Approach for Assessment of Swirl Flow Pattern in HSDI Diesel Engines

2010-32-0037

09/28/2010

Event
Small Engine Technology Conference & Exposition
Authors Abstract
Content
The fulfillment of the aggravated demands on future small-size High-Speed Direct Injection (HSDI) Diesel engines requires next to the optimization of the injection system and the combustion chamber also the generation of an optimal in-cylinder swirl charge motion.
To evaluate different port concepts for modern HSDI Diesel engines, usually quantities as the in-cylinder swirl ratio and the flow coefficient are determined, which are measured on a steady-state flow test bench. It has been shown that different valve lift strategies nominally lead to similar swirl levels. However, significant differences in combustion behavior and engine-out emissions give rise to the assumption that local differences in the in-cylinder flow structure caused by different valve lift strategies have noticeable impact.
In this study an additional criterion, the homogeneity of the swirl flow, is introduced and a new approach for a quantitative assessment of swirl flow pattern is presented.
Different valve lift strategies were investigated by transient in-cylinder CFD flow simulation, applying both the Reynolds-Averaged Navier Stokes (RANS) equations and the multi-cycle Large Eddy Simulation (LES) approach. The results obtained from the LES multi-cycle approach were averaged and compared with RANS results. An evaluation of different valve strategies using three-dimensional Particle Imaging Velocimetry in a steady-state flow configuration is also presented.
Meta TagsDetails
DOI
https://doi.org/10.4271/2010-32-0037
Pages
13
Citation
Rezaei, R., Pischinger, S., Ewald, J., and Adomeit, P., "A New CFD Approach for Assessment of Swirl Flow Pattern in HSDI Diesel Engines," SAE Technical Paper 2010-32-0037, 2010, https://doi.org/10.4271/2010-32-0037.
Additional Details
Publisher
Published
Sep 28, 2010
Product Code
2010-32-0037
Content Type
Technical Paper
Language
English