【摘要】 利用KIVA-3V模拟了一台单缸二冲程柴油机通过早喷形成准均质混合气的过程,分析了喷嘴的不同结构对缸内混合气浓度场和温度场的影响。模拟计算表明,利用早喷可以形成稀薄准均质混合气;燃烧室形状影响混合气浓度场和温度场。为使稀薄准均质混合气在缸内合理分布,在不改变活塞ω形状的条件下,使用单孔喷嘴能有效避免燃油碰壁的发生。更多还原

【Abstract】 Using software KIVA-3V,a simulation on the process of quasi-homogeneous mixture formation by means of early injection in a single-cylinder two-stroke diesel engine with ω shaped combustion chamber is conducted.The effects of different structures of nozzle on the density and temperature fields of in-cylinder mixture are analyzed.The results show that the lean quasi-homogeneous mixtures can be formed by early-injection,and the shape of combustion chamber has an obvious effect on density and temperature fields of mixture.With ω shaped combustion chamber,using single-orifice nozzle can effectively avoid the fuel spray impinging on the wall,resulting in a more rational distribution of lean quasi-homogeneous mixtures in the chamber.更多还原