Numerical analysis of thermal turbulent flow in the bowl-in-piston combustion chamber of a motored engine

✍ Scribed by Horng-Wen Wu; Shiang-Wuu Perng

• Publisher: Elsevier Science
• Year: 2004
• Tongue: French
• Weight: 647 KB
• Volume: 43
• Category: Article
• ISSN: 1290-0729
• DOI: 10.1016/j.ijthermalsci.2004.02.001

✦ Synopsis

A numerical analysis of transient turbulent thermal flow has been presented for the bowl-in-piston combustion chamber in a motored engine employing the Large Eddy Simulation which was implemented into the SIMPLE-C algorithm coupled with pre-conditioned conjugate gradient methods. The operating conditions for an engine are changed by various compression ratios (taken as 6.8, 8.7, and 10.6) and initial swirl ratios (taken as 1.325, 5.3, and 9.5) at an engine speed of 900 rpm. The results show that increasing the compression ratio, or the initial swirl ratio obviously makes radial flow (squish) and rotating flow (swirl) stronger as well as enhances the surface heat flux of wall boundaries in the combustion chamber when both of the intake and exhaust valves are closed. Furthermore, the decay rate of normalized angular momentum in the combustion chamber has been analyzed by changing compression ratio or initial swirl ratio.