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Numerical Analysis of Flow Characteristics in Swirl Chamber Type Diesel Engine  

Kwon Taeyun (Graduate School of Automotive Engineering, Keimyung University)
Choi Gyeungho (Department of Mechanical & Automotive Engineering, Keimyung University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.4, 2005 , pp. 49-57 More about this Journal
Abstract
In this study, in-cylinder flow of the swirl chamber type diesel engine numerically simulated by VECTIS code. The flow fields during the intake and compression process were also investigated in detail. Numerical results revealed that the generation and distortion of the swirling, tumbling vortices and those influences on turbulence kinetic energy by shape of the jet passage, angle and area. It was also found that flow characteristics were affected by inflow velocity that depends on change of the jet passage shape. Swirl ratio was increased according to decrease of jet passage area, and was affected by piston motion according to increase of jet passage angle. Tumbling vortices had the similar in various cases, but tumble ratio was increased with the inflow velocity. The generation of turbulence kinetic energy was considerably influenced by complex effects of swirling and tumbling vortices.
Keywords
CFD(Computational fluid dynamics); Moving grid; Swirl ratio; Tumble ratio; Cross tumble ratio; Turbulence kinetic energy;
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