基于强迫风冷的风道特性测试技术研究

The study on testing technology of wind tunnel property based on forced air cooling

强迫风冷设计中不当的风扇型号将导致电子设备的高温失效或不可逆损坏,而风扇型号的选取则直接由系统的阻力特性所决定,因此阻力特性曲线的确定成为强迫风冷设计的关键步骤。为准确、便捷地得到系统阻力特性曲线,基于风道特性测试理论搭建一套风道阻力特性测试系统,通过测量流经系统的空气流量及对应的压力损失得到系统的阻力系数,为风扇的型号选取提供依据。利用该测试系统测量多种分布形式机箱的阻力特性,结合理论和实验结果分析影响风道阻力特性的因素,总结其对阻力系数的影响关系和具体原理,为强迫风冷的风道设计提供参考。

Improper fan will lead to high-temperature failure and irreversible damage of electronic devices in forced air cooling, and the type of fan is directly determined by the resistance characteristics of the system, therefore the calculation of resistance characteristics curve becomes a crucial step in the design of forced air cooling. In order to get the resistance characteristic curve of the electronic device accurately, easily and quickly, a system based on the testing theory of wind tunnel characteristic has been built in this paper. By measuring the volume of air flow through the system with the corresponding pressure loss can help us to obtain the curve of the device which can be used to select the appropriate fan. The paper also measured the resistance characteristics of various chassis by using this testing system and made analysis on the factors which have effect on the curve combine with the theoretical. In the end, the thesis makes a summary of the relationship between the factors and the drag coefficient which can provide the reference information for structure designers in duct design of forced air cooling.