针对目前对带内流道的板翅式换热器研究较少及其散热量计算误差较大等问 题，基于空气、热流体及散热器三者耦合的基础，构建了带内流道的板翅式换热器散热特 性的仿真分析模型以及小型风洞实验系统;结果表明，构建的仿真分析模型在空气速度为 1m/s、入口温度为25℃的冷却条件下，其散热量随热流体流量的增大而增加，直至流量为 3L/min 后趋于稳定，该模型的数值分析结果与实验结果最大偏差在5% 以内． 实验验证 之后，探索了换热器的散热性能与流道分级数的作用关系; 结果显示，采用 4 级结构内流 道的散热器散热性能最好，温度均匀性最佳，但其内流道的最高温度仍低于热流体的入 口温度22K，这表明了在仿真分析中同时考虑空气、热流体及散热器三者耦合作用的必 要性． 

Currently，little study has been carried out on the plate-fin heat exchanger with internal flow channel， and its heat dissipation power cannot be calculated accurately as its boundary conditions are be over-simplified． Therefore，a simulation analysis model of plate-fin heat exchanger with internal flow channel and a small wind tunnel experimental system was developed based on the interactions of cooling air，hot fluid and heat exchanger． The results show that，under the cooling conditions of 1m/s air speed and 25℃air inlet temperature，the heat dissipation power increases with mass volume of hot fluid，and will be stable after the mass volume reaches 3 L/min． The maximum deviation between the numerical analysis results and the experimental results is less than 5%． After validation，the effect of flow channel level on heat dissipation performance was investigated． The result shows that the heat exchanger with four-level internal flow channel is of best efficiency and temperature uniformity，but its highest temperature in internal flow channel is still lower than that of hot fluid inlet temperature 22 K，which demonstrates the necessity to take the interactions of cooling air，hot fluid and heat exchanger into consideration in simulation analysis．