Numerical simulation on the preparation process of mildly stratified mixtures for a DSI gasoline engine

作者：Li Lin^*; Zhang Li; Zhang Yu; Xu Fengchu

来源：Qiche Gongcheng/automotive Engineering, 2010, 32(8): 673-677.

• Dual spark-plug ignition
• Lean combustion
• Numerical simulation
• Port fuel injections
• Swirl

A dual spark-plug ignition (DSI) combustion system is constructed based on the structure of gasoline engine JS183FMQ for a large-displacement all-terrain-motorcycle, and a numerical simulation is conducted on the process of fuel injection and mixture preparation in that DSI gasoline engine under both closing-valve and opening-valve injection modes. The results show that closing-valve injection mode can assure the full formation of homogeneous mixtures in cylinder; while opening-valve injection mode can generate stratified mixture to different extents. Further study on opening-valve injection indicates that a relatively ideal in-cylinder mildly stratified mixture can be generated by adjusting injection timing to directly inject some fuel into cylinder during valve opening phase and then inject the remainder into port during valve closing phase to form homogeneous mixture. The combined injection mode with the use of DSI and intensified swirl in cylinder make mildly stratified lean combustion feasible.

• 出版日期2010