Three-dimensional transient numerical simulation for gas exchange process in a four-stroke motorcycle engine

• Published in: Journal of Zhejiang University. A. Science Vol. 6; no. 10; pp. 1137 - 1145
• Main Author: 王春发 陈国华 罗马吉 杨万里
• Format: Journal Article
• Language: English
• Published: School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China 01.10.2005
• Subjects: 三维空间; 内燃机; 动态特性; 数字模拟; 气体交换; Dynamic grid generation; Motorcycle engine; Gas exchange process; Transient numerical simulation
• ISSN: 1673-565X; 1862-1775
• DOI: 10.1631/jzus.2005.A1137

Three-dimensional transient numerical simulation of gas exchange process in a four-stroke motorcycle engine with a semi-spherical combustion chamber with two tilt valves was studied. Combination of the grid re-meshing method and the snapper technique made the valves move smoothly. The flow structure and pattern in a complete engine cycle were described in detail. Tumble ratios around the x-axis and y-axis were analyzed. Comparison of computed pressure with experimental pressure under motored condition revealed that the simulation had high calculation precision; CFD simulation can be regarded as an important tool for resolving the complex aerodynamic behavior in motorcycle engines.