汽车高低温散热器连接方式对散热影响的研究

Study on the Heat Emission of the Different Attended Mode of High Temperature Radiator and Low Temperature Radiator

散热器是汽车冷却系统的核心,对整车正常运行具有重要影响。现代汽车冷却系统多由高温、低温散热器组成,而两部分串联、并联不同的布置形式对冷却系统散热效果和流场分布具有重要影响。基于以上特点,搭建了不同布置形式的散热器二维仿真模型,对比两种形式散热器的散热效率、散热特点等;搭建三维模型,分析内部温度场、速度场等分布及出入口温度变化;搭建车辆冷却试验系统平台,对模型仿真结果进行验证分析。分析结果可知:串联式散热器散热效率略高,但由于发动机一泵两路的散热形式,并联形式散热器适用范围更广,对高温恶劣情况的耐用性更好;而并联式散热器进水口位置不佳,散热器没有充分利用冷却资源;试验验证模拟分析的准确性,分析结果对改进冷却系散热器的设计有重要指导意义。

The radiator is the core of auto cooling system and has important influence to the normal operation of the vehicle.Auto cooling system consists of high temperature radiator and low temperature radiator,and different arrangements of the two parts have important influence on cooling system heat dissipation effect and flow field distribution. Based on the above characteristics,the two-dimensional simulation model of radiator with different arrangement was built,and the heat dissipation efficiency and heat dissipation characteristics of the parallel and series high temperature radiator with low temperature radiator were compared and analyzed. In addition,3 D-dimensional simulation model of different arrangements of the radiator have been established in the article and analysis of the internal temperature field,velocity field distribution and the entrance temperature change,etc. In the meanwhile,platform for vehicle cooling test system is constructed and the model simulation results is validated and analysed. The results show that: series radiator cooling efficiency is slightly higher,but because of a heat pump two-way form of the engine,the parallel form of radiator for a wider range of high-temperature durability of better durability. Parallel radiator inlet location is poor;the radiator does not make full use of cooling resources.The analysis results have important guiding significance for improving the design of the cooling system radiator.