管带式汽车散热器试验及数值模拟研究

Experimental and Numerical Simulation Study on Ribbon-tubular Automotive Radiator

对整体结构相同而散热带波距大小不同的管带式散热器进行传热风洞试验,分析其散热量、风阻与散热带波距的关系。采用CFD数值模拟方法,得到散热器整体换热及阻力分析数据,与试验数据对比验证了计算方法的可靠性,进而由仿真算法模拟出双排水管管带式汽车散热器的温度场和流场。根据模拟结果对比分析可知,在相同工况下,双排水管式散热器比单排水管式的散热量仅增加4.24%～15.11%,而风阻和制造材料增加一倍,因此增加水管排数以增加散热器散热量的做法并不是一种最有效的方法。

Experiments on ribbon-tubular automotive radiator with the same integral structure but different pitch of wave are carried out in a heat transfer wind tunnel. According to experimental datum, the relation between heat dissipating capacity, air drag and pitch of wave is analyzed. CFD numerical simulation method is applied to acquire the overall heat transfer and resistance analysis datum of radiator, which are compared with the experimental datum to verify reliability of calculation method. Based on the simulation algorithm, the temperature field and flow field of the double-row water tubes ribbon-tubular radiator are simulated. It is concluded from the simulation results and comparative analysis that, compared with the single-row water tubes, the double-row water tubes＇ heat dissipating capacity increases by only 4.24%-15.11%, whereas air drag and manufacturing material almost double under the same conditions, therefore it is not one of the most effective method to improve heat dissipating capacity of radiator by increasing the number of water tubes＇ row.