预燃室点火式汽油机稀薄燃烧特性仿真研究

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中图分类号：U464.149 文献标志码：A

Simulation study on lean-burn combustion characteristics gasoline engine with pre-chamber ignition

YIN Congbo， FAN Jingzhi， SUN Yuedong， ZHANG Zhendong （ ， ， 2oo093，）

Abstract： The simulation study was carried out on a turbocharged direct injection gasoline engine with a passive pre-chamber. The three-dimensional simulation model pre-chamber ignition engine was established， the lean-burn combustion environment （excess air coefficient λ=1.3 ）was med by using the three injection strategy. The gas flow， spray， combustion emission characteristics at different working conditions were studied by simulation. The simulation results show that a significant tumble flow intake air is med in the main chamber， the maximum turbulence kinetic energy （TKE） at the end combustion can exceed 150m2/s2 ， but further delaying the ignition time to 715∘ crank angle， the maximum TKE will drop to about 110m2/s2 . During the jet flame spraying process， there is a significant imbalance， with the jet flame spreading faster from the right-side nozzles， while the jet flame spreading slower in individual left-side nozzles. By delaying the ignition time under heavy load，the maximum temperatures the main chamber the pre-chamber are effectively reduced， thus reducing the maximum pressure emissions NOx CO. The maximum mass concentration NOx in the main chamber is reduced by about 54% ， the maximum mass fraction CO is reduced by about 30%

Keywords： passive pre-chamber; gasoline engine; lean-burn combustion; simulation study

内燃机及汽车工业的发展与能源和环境问题密切相关，减少燃料消耗和排放物是内燃机未来的两个主要目标，这对能源效率、能源成本和环境污染至关重要[]。（剩余13379字）