預燃室點火式汽油機稀薄燃燒特性仿真研究
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中圖分類號：U464.149 文獻標志碼：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
內(nèi)燃機及汽車工業(yè)的發(fā)展與能源和環(huán)境問題密切相關，減少燃料消耗和排放物是內(nèi)燃機未來的兩個主要目標，這對能源效率、能源成本和環(huán)境污染至關重要[]。（剩余13379字）