摘要
通过应用STAR CCM+的3D-CAD几何建模功能模块,在设计过程中将汽车排气系统中的催化器扩张管和收缩管锥度、催化剂载体直径和长度、连接管段直径等关键尺寸参数化,并建立了流体动力学模型,通过对其进行三维稳态流动数值模拟,发现扩张管的形状会对气流在管壁出现分离和漩涡产生影响,直接通过调整设计参数对3D几何模型进行修改,降低了排气压力损失和流动不均匀度,实现设计的优化,实现了CAD和CFD工作过程的集成,缩短了设计和优化时间。
In this paper,radian and conical degree of diffuser and diameter and length of substrate were parametric designed with 3D-CAD modeling based on STAR CCM＋.The mathematical model of flows in the substrate was established,and 3D numerical simulations of the steady flows in the exhaust system with different diffuser configurations were performed.The results show that irrational diffuser can cause the flow separate from the wall and produce stronger turbulent.The optimal design was achieved by direct modifying the 3D model design parameters,the exhaust system pressure loss and flow uniformity was decreased.This method integrates CAD and CFD procedures,it cut down workload and increase efficiency.
出处
《装备制造技术》
2011年第7期44-46,50,共4页
Equipment Manufacturing Technology
关键词
排气系统
参数化设计
优化
ehaust system
parametric design
optimize
