工程车辆五位数翼型热管散热器性能对比分析

Comparative Analysis on the Performance of Radiators with 5 Digit NACA Airfoil Tubes for Construction Vehicles

为提高某工程车辆散热器综合性能,根据厂商提供的尺寸参数,对其进行性能分析和结构优化。建立散热器单元体模型进行三维数值模拟计算,并将仿真结果与试验结果对比分析,以验证该模拟方法的准确性;以降低压力损失为前提,选用NACA23021翼型建立散热器热管模型,采用相同的仿真方法获取散热器空气侧压力损失和换热系数,进一步得出两者的综合性能评价因子j/f1/3;将NACA23021翼型管翅片综合评价因子与已发表文献中NACA0018仿真结果进行对比分析。研究结果表明:在入口空气流速为2~10 m/s范围内,散热器空气侧压力损失和换热系数的试验与仿真误差值小于5%;在仿真区间内,NACA23021翼型管翅片的综合评价因子较扁平管翅片平均高出约23%,较NACA0018翼型管翅片平均高出约9.7%,为该翼型管翅片散热器在工程车辆上应用提供了参考。

In order to improve the comprehensive performance of radiators used in construction vehicles,the performance analysis and structural optimization for radiators were conducted according to the size parameters provided by manufacturer. The radiator element model was established and the three-dimensional numerical simulation was carried out. The simulation results were compared with the test results to verify the simulation accuracy. On the premise of reducing pressure loss,the airfoil NACA23021 was used to shape the tube model of the radiator,and the same simulation method was used to obtain the lateral pressure loss and heat transfer coefficient on the air side. Then,the comprehensive performance evaluation factor j/f1/3 was acquired. The NACA23021 airfoil fin comprehensive evaluation factor was compared and analyzed with the NACA0018 simulation results,which are reported in the literatures. It shows that the error between experimental data and simulation results is less than 5% over the inlet velocity range from 2 to 10 m/s,for the airside pressure loss and heat transfer coefficient. In the same range,the comprehensive evaluation factor of NACA23021 airfoil fin is about 28% higher than that of flat fin,and about 9. 7% higher than that of NACA0018 airfoil fin. This work could offer a specific reference for the application of wing-shaped tube radiators in construction vehicles.