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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%。
Firstly, the aerodynamic action of the gurney flaps on the blade in the two-dimensional diffuser cascade is studied, and the influence of the two parameters of flap height and installation position on the aerodynamic performance of the cascade is analyzed. The results show that Gurney flap can significantly improve the lift of the airfoil, but the resistance also increases. Next, based on the optimal flap height and installation position obtained from the two-dimensional cascade calculation, Gurney flaps were applied to the axial fan blades to investigate the effect on fan performance. The results show that the flaps significantly increase the fan airflow angle and increase the fan pressure rise. When the flow rate is less than the designed flow rate (Q = 1.0), the total pressure efficiency of the flap fan is slightly different from the original fan efficiency. At the design point , The efficiency of the flap fans is 1% higher than that of the original fans, and when the fan flow is greater than the design flow, the difference between the total fan fan and the original fan’s total pressure efficiency gradually expands. When the relative flow rate Q = 1.5, The total pressure efficiency is 6% more efficient than the original fan.