摘要
为抑制混动发动机爆震现象,基于超高压缩比混动发动机,建立计算流体力学(CFD)模型,通过台架试验分析发动机子系统及控制参数对爆震的影响。结果表明:提高进气道滚流比可实现快速燃烧;提升燃烧室加工精度可改善燃烧一致性;缸体、缸盖分离式冷却可实现分区温度智能调节;增加挡水板可降低金属温度;对于该发动机最大有效热效率点,降低废气再循环(EGR)系统压损,可使EGR率达到25%;高温环境下,需对发动机有效压缩比及出水温度进行精确控制。
In order to suppress the knocking phenomenon of hybrid engine,a Computational Fluid Dynamics(CFD)model is established based on the ultra-high compression ratio hybrid engine.Bench tests are carried out to analyze the influence of engine subsystem and control parameters on knocking.The results show that rapid combustion can be achieved by increasing the inlet tumble ratio.Improving the machining accuracy of the combustion chamber can improve the consistency of combustion.Separate cooling of cylinder block and cylinder head can realize intelligent temperature regulation.The addition of a water baffle can reduce the temperature of the metal.For the maximum effective thermal efficiency point of the engine,reducing the pressure loss of the Exhaust Gas Recirculation(EGR)system can make the EGR rate reach 25%.In hightemperature environments,the effective compression ratio and engine outlet temperature require precise control.
作者
张子庆
蔡霁蕾
Zhang Ziqing;Cai Jilei(SAIC Motor R&D Innovation Headquarters,Shanghai 200438)
出处
《汽车技术》
CSCD
北大核心
2024年第9期25-31,共7页
Automobile Technology
关键词
高压缩比
爆震
热效率
燃烧
冷却系统
废气再循环
High compression ratio
Knock
Thermal efficiency
Combustion
Cooling system
Exhaust Gas Recirculation(EGR)
