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A New CFD Approach for Assessment of Swirl Flow Pattern in HSDI Diesel Engines
Technical Paper
2010-32-0037
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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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.Also In
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