中文摘要：

首先研究了二维扩压叶栅中叶片尾缘格尼襟翼对叶片的气动作用,分析了襟翼的高度、安装位置2个参数对叶栅气动性能的影响。结果表明,格尼襟翼能明显提高翼型升力,但阻力也有所增加。接着基于二维叶栅计算获得的最佳襟翼高度和安装位置,将格尼襟翼应用于轴流风扇叶片上,研究其对风扇性能的影响。结果表明,襟翼明显增大了风扇气流转折角,提高风扇的压升,在流量小于设计流量（Q=1.0）时,襟翼风扇总压效率与原始风扇效率相差甚微,而在设计点处,襟翼风扇效率比原始风扇效率高出1%,且当风扇流量大于设计流量时,襟翼风扇与原始风扇总压效率间的差距逐渐扩大,当相对流量Q=1.5时,襟翼风扇总压效率比原始风扇效率高6%。

英文摘要：

The aerodynamic effects of gurney flap＇ s height and location on 2D diffusive cascade was studied firstly. The results showed that,the gurney flap can increase the airfoil lift significantly,as well as the corresponding drag. Then,the best gurney flap gained from above studies was applied on an axial fan. It is found that the gurney flap increases the flow turning angle resulting in the increase of pressure. When the relative flow rate 〈 1. 0, the total pressure efficiency of the axial fan with and without gurney flap were almost the same. At the design point（ Q =1.0） ,the efficiency of fan with gurney flap was 1% higher than origin one. However,the total pressure efficiency of the fan with gurney flap was 6% higher than origin fan,when it comes to =1.5.