高负荷扩压静叶中附面层抽吸策略的设计与优化

Design and Optimization of Boundary Layer Suction Configurations Within a Highly-Loaded Diffusion Stator

以某高负荷、大折转角扩压静叶为研究对象,采用数值方法进行了二维叶型和全三维流动层面的附面层抽吸策略设计与优化研究.从流动机理和作用机制出发,揭示附面层抽吸减小流动分离、改善压气机性能的原因.研究结果表明,在实施二维叶型的附面层抽吸时,效果最佳的抽吸位置位于流动分离起始点后的临近区域;进行三维抽吸时,采取叶片表面全叶高抽吸缝和下端壁沿流向抽吸缝的复合抽吸方式,可以有效地控制静叶吸力面及角区的强三维分离流动,改善叶栅流动条件,提高性能.

The design and optimization of 2D and 3D boundary layer suction （BLS） configurations within a highly-loaded diffusion stator was conducted in this paper by using numerical simulations. A detailed anal ysis was done based on flow mechanism to reveal the reason for reducing flow separation and improving compressor performance by BLS method. The numerical results show that the best BLS position is located at the region a little backward from the separation point in 2D cascade. Further discussion on 3D BLS shows that the combination of blade suction slots along the whole span and slots along streamline at the hub-suction side region achieves the best effect. This compound BLS configuration can effectively control the strong 3D separation flow at the hub-suction side region, which improves the flow condition and leads to a better stage performance.