为研究涡量分析方法在轴流式冷却风扇优化设计的应用，首先建立轴流风扇气动性能参数与周向涡量的直接数学物理关系，发现叶片表面平均周向涡量与风扇静压呈正相关；并基于一款实例轴流冷却风扇，详细阐述了涡量分析方法步骤。建立风扇管道数值计算模型，并从涡量角度指出了该款风扇的优化设计思路。结果表明：根据负周向涡量的分布，在风扇叶片表面增加导向筋，可以有效隔断负周向涡量的发展、提高平均周向涡量。利用涡量分析方法，合理设计导向筋的形状、高度及厚度，可有效提高风扇气动性能。并将优化前后实例风扇进行测试，根据实测结果，最终验证涡量分析方法可辅助于轴流冷却风扇优化设计。

The method of vorticity analysis for axial flow cooling fan optimization is studied. A mathematical physics relationship is established between the circumferential vorticity and aerodynamic performances of fan. And the average circumferential vorticity on the fan blade and the static pressure are positive correlated. Based on a true axial flow fan, the method of vorticity analysis is described in detail. A simulation model of fan pipeline is set up, and an idea of the fan optimization is pointed out by the method of vorticity analysis. The research results show that the negative circumferential vorticity is cut off by the guide rib, which designed on the blade surfaces according to the distribution of the negative vorticity, and the average circumferential vorticity value is improved. The guide rib is designed reasonably using the analysis method, such as the shape, height and thickness of the rib. The aerodynamic performance is improved obviously after adding the guide rib. The test is preceded after the optimization. The test results states that the method of vorticity analysis can be used for the optimization of axial flow cooling fan.