可逆风机用翼型气动特性分析与实验研究

Aerodynamic Characteristic Analysis of Airfoils and Experimental Investigation for Reversible Air Fan

可逆翼型气动性能的优劣对可逆风机性能好坏起着至关重要的作用。选取了形式不同的三种翼型,即对称翼型、S型翼型和常规非对称翼型,利用X-foil软件对上述三种翼型的气动性能进行数值计算。结果显示,在较大的攻角范围内,常规非对称翼型的升力特性和升阻比特性都明显优于另外两种翼型。为了比较三种翼型在可逆风机中的应用效果,通过调整设计参数使采用三种翼型设计的叶片具有相同的弦长和扭曲变化规律,然后在标准风管式出气试验台上进行了空气动力性能实验。研究表明:在选取的三种翼型中,采用对称翼型设计的可逆风机叶轮最为理想,其额定工况点的实验性能满足设计要求,且具有良好的反风性能,同时正、反风工况下都有较宽的高效工作范围。

The aerodynamic performance of reversible airfoils plays an important role in the performance of the reversible air fan.Three airfoils,namely symmetrical airfoil,S type airfoil and conventional asymmetric airfoil,are selected and the aerodynamic performance of the three airfoils is solved by using X-foil software.The results show that within a large range of angle of attacks lift characteristics and lift to drag ratio characteristics of the conventional asymmetric airfoil are better than those of the other two airfoils.In order to compare the effect of the three airfoils in practical application,by adjusting the design parameters,the chord and twist for the blades designed with the three airfoils has the same change pattern.Then the aerodynamic performance tests were carried out on a standard air duct type test rig.The results show that in the selected three kinds of airfoil,the reversible fan impeller designed by the symmetrical airfoil is the most ideal one,the rated point performance of which meets the design requirements,and has good anti-wind performance.At the same time,the wind conditions have a wide range of high efficiency no matter in positive case or negative case.