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Passive Control with Blade-End Slots and Whole-Span Slot in a large Camber Compressor Cascade
Author(s): Hejian Wang, B. Liu, B. Zhang
Keywords: High-momentum jet; Boundary layer separation; Three-dimensional corner separation; Whole-span slot; Blade-end slots; Total pressure loss.
Treating the blade with a suitable slot structure, which can generate high-momentum jet flow through the pressure difference between the pressure and suction surface. It has been proved that the slot jet flow can reenergize the local low-momentum fluid to effectively suppress flow separation on the suction surface. In order to explore the better slotted method for the comprehensive suppress effect on the suction surface boundary layer separation near midspan and the three-dimensional corner separation, a large camber diffusion stator cascade is selected as the research object. Firstly, set up the Slotted_1、Slotted_2 whole-span slotted plans, then the Slotted_3 plan with whole-span slot and blade-end slots is proposed, finally the performance of slotted cascades and original cascade are calculated under a wide incidence angle range at Ma=0.7. The results show that: in the full range of incidence angles, compared with whole-span slotted plans, the Slotted_3 plan can effectively suppress the development of the end wall secondary flow on the suction surface of the blade, reduce the mutual interference between the secondary flow and the main flow, basically eliminate the boundary layer separation near midspan and the three-dimensional corner separation. As a result, compared with the original cascade, the Slotted_3 plan can reduce the total pressure loss in full range of incidence angles, broaden the operating range of incidence angles from -4°-2° to -7°-5°. Moreover, compared with the whole-span slotted plans, the Slotted_3 plan has a better adaptability to wide range of incidence angles.