歧管式催化转化器流固耦合与热应力分析

Solid-fluid coupling and thermal-stress analysis for catalytic converter of manifold type

通过实验来了解歧管式催化转化器流动特性、热变形状况,既费时又费了力。通过CAE技术可以大大减少试验工作量,缩短设计周期,为产品前期设计开发提供了结构优化依据。针对某型号歧管式催化转化器建立了有限元分析模型,采用流固耦合方法分析计算得到传热分析的边界条件,再经过传热分析得到转化器的温度场,并在此温度场下对催化转化器进行热应力分析。得到了该型号歧管结构热应力分布状况,对应力集中与应力最大处结构提出了相应的优化与修改意见,有效的避免了因应力集中造成的结构破坏。

It will cost a lot of time,manpower and financial resources through experiments to understand the flow characteristics of catalytic converter.With the development of CAE technology,testing effort and the design cycle can be reduced greatly,besides it can provide structural optimization foundation for early product design and development.Based on one type catalytic converter of manifold type,a finite element analytical model is established,through which heat transfer boundary conditions are obtained by analyzing and calculating with method of solid-fluid coupling,the temperature field of the converter is got as well,under which thermal stress analysis is carried out.Thus the thermal-stress distribute status can be got about this type converter.And optimization and modification for structure where the stress is concentrated and reach maximum are advised to avoid structural damage caused by the stress concentration effectively