定常吸气改善叶型气动性能的数值研究

NUMERICAL INVESTIGATION OF IMPROVING PROFILE PERFORMANCES BY STEADY SUCTION AIR

提高叶型升力,扩大其稳定工作范围一直是叶轮机械领域关心的问题。本文针对采用定常吸气方法减缓低马赫数流动分离,改善叶型气动特性的问题,在NACA0015叶型上进行了多种工况的数值模拟。结果表明:在叶型头部吸力面分离点附近施加定常吸气,可以提高叶型升力,降低阻力,推迟失速2°左右。存在着最佳的定常吸气动量范围和吸气位置,使得其改善叶型性能的效果最大。文中还给出了定常吸气动量和施加位置等参数对叶型气动性能的一些影响规律。

To increase lift-force and decrease drag-force of a blade is of important significance for turbo- machinery. The aerodynamic characteristics of the profile NACA0015 with steady suction air on the profile surface have been investigated by numerical simulating the flow fields around the profile under different low Mach Numbers. The results show that, by means of adding steady suction air around the flow separation point on the suction surface of the blade, the profile-lift can be increased, the profile-drag can be decreased, and the stall can be delayed about 2° at the same time. There are optimal momentum and location of the steady suction air for maximal benefits of improving profile performances. Some relations between the momentum and location of the steady suction air and the coefficients of lift-force and drag-force of the profile have also been shown in the paper.