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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2005, Vol. 6 Issue (10): 1137-1145    DOI: 10.1631/jzus.2005.A1137
Energy & Mechanical Engineering     
Three-dimensional transient numerical simulation for gas exchange process in a four-stroke motorcycle engine
WANG Chun-fa, CHEN Guo-hua, LUO Ma-ji, YANG Wan-li
School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract  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.

Key words： Motorcycle engine      Gas exchange process      Transient numerical simulation      Dynamic grid generation     
Received: 08 April 2005     
CLC:  TK411.3  
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WANG Chun-fa
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YANG Wan-li
Cite this article:

WANG Chun-fa, CHEN Guo-hua, LUO Ma-ji, YANG Wan-li. Three-dimensional transient numerical simulation for gas exchange process in a four-stroke motorcycle engine. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2005, 6(10): 1137-1145.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2005.A1137     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2005/V6/I10/1137

[1] LUO Ma-ji, CHEN Guo-hua, MA Yuan-hao. Three-dimensional transient numerical simulation for intake process in the engine intake port-valve-cylinder system[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2003, 4(3): 309-316.