To solve problems of unsatisfactory velocity distribution, low oxygen filling efficiency, difficult control of dissolved oxygen content, and contradiction between oxygen filling capacity and power efficiency in aerator operation, an airfoil with a logarithmic spiral as a busbar and a NACA0012 airfoil as a cross section was proposed based on the characteristics of linear and operating parameters of blades. The CFD Software Fluent was used to simulate and to analyze the influence of the airfoil blade on the oxygen mass transfer, stirring, and pushing flow in an oxidation ditch. Three factors, including the impeller rotating speed, immersion depth and the blade incline angle, related to aeration efficiency of the surface aerator, were studied by experiments, and the maximum dynamic efficiency of two types of impellers with different blade inclination angles was found.

为解决曝气机运行中流速分布不理想、充氧效率低、溶解氧含量控制难、充氧能力与功率效率矛盾等问题，以对数螺线为母线，以NACA0012翼型为横截面的翼型是根据叶片的线性和运行参数的特点提出的。利用CFD软件Fluent模拟分析了翼型叶片对氧化沟内氧传质、搅拌和推流的影响。通过实验研究了与表面曝气器曝气效率相关的叶轮转速、浸入深度和叶片倾角3个因素，