作　　者： ; ; ; ; ; ;

机构地区： 西安交通大学能源与动力工程学院动力工程多相流国家重点实验室

出　　处： 《西安交通大学学报》 2008年第11期1356-1360,共5页

摘　　要： 利用粒子图像测速技术和红外热成像技术，对增压空冷器用圆弧型和X型开缝翅片空气侧的流动和传热特性进行了可视化实验研究．在实验的雷诺数（800-3400）范围内，得到了阻力和换热特性曲线，以及能反映流动和传热微观特性的流场和温度场．实验结果表明，圆弧型开缝翅片的阻力小于X型开缝翅片，并且前者在强化圆管背风侧的换热特性方面优于后者，但后者整体的场协同性和换热性能优于前者．结合两种翅片的优点，优化设计出了一种新型的开缝翅片（X圆弧型）．对3种开缝翅片的流动和换热特性进行了数值模拟。模拟结果与实验结果吻合得很好．模拟结果表明，优化后的X圆弧型开缝翅片的场协同性、换热性能均优于前两种翅片．新翅片在考虑了阻力因素后的综合换热性能较圆弧型开缝翅片提高了7％～15％，较X型开缝翅片提高了3％～9％． Air side heat transfer and fluid flow characteristics of slotted fin surfaces with arc-type and X-type strip arrangement in a pressurizing air cooler were studied by visualization experiments. Experiments were conducted out by a particle image velocimetry（PIV） system and an infrared thermo tracer to visualize the flow field and the temperature distribution of two slotted fin surfaces. The experimental results show that the pressure drop of the arc-type slotted fin surface is lower than that of the X type slotted fin surface and the former contributes more to improving the heat transfer performance at the back of the tube. However, the integrated heat transfer performance and field synergy character of the latter are superior to those of the former. According to the merits of the two slotted fin surfaces, a new type slotted fin surface（X-arc type） was designed. Heat transfer and fluid flow characteristics of three slotted fin surfaces were simulated and the results agree well with the experiments data. Numerical simulation results show that the field synergy character and heat transfer performance of the optimized fin surface are better than those of the other two slotted fin surfaces. Within Reynolds number range from 800 to 3 400, the integrated heat transfer performance of the new designed fin surface is about 7 %- 15 % higher than that of arc-type fin surface and 3%-9% higher than that of X-type fin surface.

关 键 词： 开缝翅片 粒子图像测速 红外热成像 数值模拟 场协同

领　　域： [动力工程及工程热物理] [动力工程及工程热物理]