Influences of Root Fillet and Dihedral Angle of Bowed Stator Blade on Aerodynamic Performance of Low-Speed Single-Stage Axial Compressor

The circumferential bowing of stator blade is known to possess the ability to suppress the corner separation. To enhance the improvement of the aerodynamic performance of axial compressors by the application of the bowed stator blade, the optimizations of blade shape have been studied by many researchers. In most of these studies, the blade root fillets which exist in actual compressors were neglected. However, it was reported that the stator blade root fillets influence the generation of the corner separation in the compressor which has the conventional stator blades. Therefore, the stator blade root fillets can contribute to the improvement of the aerodynamic performance due to the bowed stator. In this study, the influences of the root fillets and the positive dihedral angle of the bowed stator blade on the overall performances and the internal flow behavior of low-speed single-stage axial compressors were clarified. © 2024 Masanao Kaneko and Hoshio Tsujita.