0/1 and 3 - dimensional cold flow analysis of a diesel engine: A case study

Year 2024, Volume: 8 Issue: 1, 142 - 149, 31.03.2024

Gonca Kethudaoglu Fatih Aktaş Salih Karaaslan Nureddin Dinler

https://doi.org/10.30939/ijastech..1384376

Abstract

Gas motion in the engine cylinder plays a critical role in diesel engines' air-fuel mixing and combustion processes. Moreover, it influences the engine's performance, emissions, and heat transfer. The intake air motion regulates the main phases of the flow in the cylinder, which is characterized by swirl, squish, and turbulence. Inducing swirl and tumble in the intake process provides high turbulence levels at ignition, resulting in more effective flame speeds and better combustion for lean air-fuel ratios or with EGR. Computational fluid dynamics (CFD) software is used to enhance in-cylinder flow characteristics. In this study, a cold flow simulation of a naturally aspirated, direct injection diesel engine was conducted with different piston bowls using AVL Fire M R2022.2. Swirl, tumble, and TKE parameters were investigated to make a detailed analysis of the in-cylinder flow for the relevant engine. Contrary to the expectation, the swirl ratio for the Piston B configuration is less than that for the original piston configuration. It causes a decrement of swirl ratio compared to the initial piston geometry and the maximum decrement is about 19%. In both cases, the second peak of TKE corresponding to the reverse-squish is around at the -30 CA and the difference between the curves is about ±8%.

Keywords

CFD simulation, cold flow, diesel engine, swirl, tumble

Supporting Institution

TÜBİTAK

Project Number

122M511

Thanks

This study was supported by TUBITAK/TURKEY in frame of the project code of 122M511 as researchers, we thank the TUBITAK/TURKEY. We would like to express our gratitude to AVL LIST GmbH for providing AVL Boost and FIRE software as part of the University Partnership Program.

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