Simulation and experimental studies on variable charge tumble motion ( VCTM) technique are conducted on a Changan's 1. 5L turbocharged direct injection engine. The study mainly focuses on the condition of catalyst light-off and meanwhile pays attention to the fuel consumption in steady-state part-load condition. The effects of different VCTM schemes on tumble ratio and turbulent kinetic energy in catalyst light-off condition and those on fuel-gas mixing quality and the surface wetting of combustion chamber in part-load condition are analyzed. Finally the optimum schemes in both catalyst light-off and steady-state part load conditions are obtained through electronic injection parameter optimization. Test results show that the adoption of VCTM technique can enhance combustion stability and reduce the fuel consumption and emission of engine.%在长安一款1.5L缸内直喷涡轮增压发动机上进行了可变进气滚流技术的仿真和试验研究.研究主要聚焦于催化剂起燃工况,同时也关注了稳态部分负荷工况的燃油消耗,分析了几种不同的可变进气滚流方案在催化器起燃工况对滚流比和湍动能的影响和在部分负荷工况对油气混合质量和燃烧室表面湿壁量的影响.最后通过优化电喷参数,获得在催化器起燃和部分负荷稳态工况最优的方案.试验结果表明,采用可变进气滚流技术能提高燃烧稳定性,降低发动机油耗和排放.
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