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中文摘要：
基于废气-负荷控制策略的汽油机HCCI燃烧,利用排气门管理内部残余废气率,控制发动机负荷,进气门升程和相位调节缸内状态,控制着火和优化燃烧相位。本文利用KIVA对全可变气门机构单缸机进行CFD仿真,研究缸内温度、残余废气分布特征,以及温度、废气不均匀分布对着火的影响。结果表明,采用废气-负荷控制策略,改变进气门相位和升程可以调节缸内温度和残余废气的不均匀分布。随着内部残余废气率增大,进气门对缸内温度和废气率分布不均匀度的调控能力增强。大废气率条件下,温度和废气率不均匀度对着火时刻调节作用较明显,可以实现10°曲轴转角的有效调节;小废气率条件下,由于缸内温度和废气不均匀分布差别较小,其对于着火时刻的调节作用表现得不明显。
英文摘要：
For a HCCI gasoline combustion engine driven by burnt residual gas,management of the residual gas and thermal distribution in cylinder is a possible way to optimize the auto-ignition and combustion phasing.The management ability of intake valve on the distribution of the residual gas and the temperature and its effects on auto-ignition are investigated on KIVA code.The results show that,the temperature and RGF inhomogeneous distribution can be varied through adjusting intake valve lifting and timing.The variable range of the inhomogeneities become wider as the RGF increases.The influence of the temperature and RGF distribution on the auto-ignition timing on the large RGF conditions is larger than that on the small RGF conditions,and the range of the auto-ignition timing can arrive at 10 degrees crank angle on the large RGF conditions.
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