电控单缸柴油机燃烧室设计与实验研究

Design and tests of a combustion chamber for an electrically controlled,single-cylinder diesel engine

为了满足发动机动力性、经济性和排放的要求,设计与进气系统和燃油喷射系统相匹配的燃烧室构型至关重要。采用数值模拟和实验验证相结合的方法,对电控单缸柴油机的燃烧室进行设计和优化。参考基准机型的主要结构参数,完成燃烧室结构设计,采用Euler-Lagrange联合仿真法对发动机标定点和扭矩点的性能进行计算,并与实验结果对比;对燃烧室结构进行参数化建模,研究标定点和扭矩点工况下燃烧室缩口比、燃烧室深度、燃烧室内径3个关键结构参数对发动机耗油率和排放的影响。结果表明:EulerLagrange联合仿真法满足燃烧室设计要求;在进气系统和燃油喷射系统确定的情况下,燃烧室的3个关键结构参数对发动机性能有显著影响。

The design of a combustion chamber must match the intake air and fuel injection systems to improve the power, specific fuel consumption （SFC） and emissions of diesel engines. Numerical simulations and experimental validations are used to optimize the combustion chamber of an electrically controlled, single-cylinder diesel engine. The power and torque of a single-cylinder diesel engine are predicted using a hybrid Euler-Lagrange method with comparisons to test measurements. A parameterized design is then used to design the combustion chamber. Three key parameters for the re-entrance ratio, depth and inner diameter of the combustion chamber relate to the engine performance （power, torque, SFC and emission）. The results show that the hybrid Euler-Lagrange method can be used to design the combustion chamber. The three key parameters strongly affect the engine performance for the given intake air and fuel injection systems.