摘要
为了建立汽车尾气催化转化器冷启动过程温度场变化的数学模型,必须正确地选取对流换热系数关联式。本文选用三个典型的对流换热系数关联式,对无化学反应条件下催化剂载体的温升过程分别进行了数值模拟。同时建立实验台,测量不同工况下载体温升过程中温度场的变化。数值模拟与实验结果的对比表明,在催化转化器冷启动过程的不同阶段,应使用不同的对流换热系数关联式进行描述。
To choose the proper correlation for convection coefficient is very important in modeling the temperature field in a cold-start Automotive Catalytic Converter. A mathematical model was de-veloped to simulate the unsteady temperature field in monolith catalyst and three different empirical correlations for heat-transfer coefficient were used to calculate the heat-transfer rate in the model. An experimental system was developed to measure the temperature field inside a cold-start monolith cata-lyst without chemical reactions. The experimental and simulation results showed that the correlations for heat-transfer coefficient in monolith were different in the two stages of the cold-start.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2002年第5期620-622,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.50076021)
北京市科委基金资助项目(No.954062400)
关键词
汽车尾气
催化转化器
对流换热
温度场
catalytic converter
temperature field
convection heat transfer
