汽车发动机进气道流场三维数值解析与优化  

Three-dimensional simulation and optimization of engine intake ports

作　　者：王志[1] 帅石金[1] 王建昕[1] 黄荣华[2] 王必璠[3] 卢蓓[3] 

机构地区：[1]清华大学汽车工程系汽车安全与节能国家重点实验室,北京100084 [2]华中科技大学能源与动力学院,武汉430074 [3]东风汽车工程研究院,十堰442001

出　　处：《清华大学学报（自然科学版）》2004年第8期1146-1149,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为了改进EQ4BTAA增压空空中冷柴油机性能,对发动机的高涡流进气道内流场进行了三维数值模拟,得到了不同气门升程下详细的流场结构。气道性能评价参数(流量系数和气流转矩)的计算结果与稳流试验台的试验结果吻合较好。通过流场分析,找到了气道不合理的部位,并应用CAD/CAM/CFD集成的方法对气道进行了优化。优化后气道流量提高了14%,涡流比降低了12%,改进的气道与发动机匹配后,该柴油机的排放已达欧 标准。To improve combustion and emissions performance of 4BTAA turbocharged air-cooled diesel engine, the three- dimensional flow field in a high-swirl intake port was numerically simulated to analyze the detailed flow structures for different valve lifts. The calculated results for the flow coefficient and the torque agree well with steady flow measurements. The simulation showed that the configuration of the intake port reduced the flow efficiency so the configuration was optimized to improve engine performance. An integrated CAD/CAM/CFD environment was used to improve the port configuration. After optimization design, the flow coefficient increases by 14% and the swirl ratio reduces by 12%. The improved port configuration has been installed in diesel engines which now come up to European Ⅱ emission standards.

关 键 词：汽车发动机 气道 三维数值模拟 优化 

分 类 号：U464.12[机械工程—车辆工程] 3[交通运输工程—载运工具运用工程]