翼型翅片对管片散热器散热性能的影响

针对恶劣环境下工程车辆散热能力不足的问题,提出一种翼型翅片的管片散热器改善方案。首先,采用Fluent 15.0对散热器原始模型的单元体进行数值建模分析,并与试验数据对比验证仿真的可行性;其次,采用相同仿真条件对翼型翅片散热器进行仿真分析;然后分别研究翼型方案、类型和位置对压力损失和换热系数的影响;最后,通过田口法设计正交试验,寻找最优的翼型翅片配置组合。结果表明:仿真结果与试验数据吻合较好;在进气口速度为12 m/s时,翼型翅片比原始翅片综合评价因子提高5.73%;翼型种类和翼型方案对压力损失与换热系数的影响较大,翼型的移动位置对压力损失和换热系数几乎没有影响;采用方案2、NACA0015翼型和左移2 mm的配置组合时的综合评价因子最大,散热性能改善最明显。研究结果为翼型翅片在工程车辆管片散热器性能改善方面提供了经验认知。

Influence of Airfoil Fin on the Heat Transfer Performance of Tube-and-fin Radiator

In order to the insufficient capacity of heat transfer of Construction vehicles under hash circumstances, a new improvement on tube-and-fin radiator with wing-shaped fin was proposed in this work. Firstly, Fluent15.0 was adopted to conduct numerical modeling analysis on the element body of the original radiator model, and the feasibility of simulation was verified by comparing with the test data. Secondly, the same simulation condition was adopted to analyze the airfoil fin radiator. Then, the influence of scheme, type and location of airfoil on pressure loss and heat transfer coefficient was studied. Finally, taguchi method was adopted to design the orthogonal test to search the optimal configuration combination of airfoil fins. The results show that the simulation results are in good agreement with the experimental data. When the inlet velocity is 12m/s, the comprehensive evaluation factor of the airfoil fin is 5.73% higher than that of the original fin. Among them, airfoil type and scheme have great influence on pressure loss and heat transfer coefficient, and the moving position of airfoil has little influence on pressure loss and heat transfer coefficient. In the end, the configuration combination of scheme 2, NACA0015 airfoil and left shift 2mm had the largest comprehensive evaluation factor, so that the most obvious improvement in heat dissipation performance. It provides the experience and cognition for the airfoil fin to improve the performance of the tube-and-fin radiator of the engineering vehicle.