Numerical Analysis of the Diffusion Process of Intake Mixture in Dual-Intake Valve Engines

• Published in: JSME International Journal Series B Fluids and Thermal Engineering Vol. 38; no. 2; pp. 213 - 221
• Main Authors: Wakisaka, Tomoyuki, Isshiki, Yoshihiro, Shimamoto, Yuzuru, Magarida, Naofumi
• Format: Journal Article
• Language: English
• Published: Tokyo The Japan Society of Mechanical Engineers 01.01.1995; Japan Society of Mechanical Engineers; Japan Science and Technology Agency
• Subjects: Applied sciences; Diffusion; Dual-Intake Valve Engine; Energy; Energy. Thermal use of fuels; Engines and turbines; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Gaseous Fuel; Internal Combustion Engine; Lean Mixture Combustion; Numerical Analysis; Stratified Charge; Swirl; Tumbling Vortex; Intake valve; Gaseous fuel; Mixtures; Stratified charge; Internal combustion engines; Diffusion process; Air; Vortex flow; Simulation model
• ISSN: 1340-8054; 1347-5371
• DOI: 10.1299/jsmeb.38.213

The diffusion process of the intake mixture (homogeneous mixture of air and gaseous fuel) in the cylinders of dual-intake valve S. I. engines has been analyzed numerically using the GTT and CIP methods and the k-ε turbulence model. The following has been found : When the fuel is supplied into only one intake port in one engine in which a tumbling vortex is generated, the intake mixture is localized mainly in half of the combustion chamber and the fuel concentration is stratified. In another engine in which a swirl is generated by holding one intake valve closed, a relatively homogeneous mixture or an axially stratified mixture is formed in the combustion chamber, depending on whether fuel supply is early or late.