Application of tandem blade and endwall boundary layer suction in an outlet vane

What is it about?

An effective flow control mathod is proposed. The design philosophy is to utilize the EBLS to suppress the three-dimensional corner stall while to use the tandem blade to control the two-dimensional airfoil flow separation. The endwall boundary layer suction is barely implemented in the forward blade, whereas the corner flow in the rear blade is restrained by the flow through the gap between the forward and rear blades. The preliminary implement strategy of the compound flow control was presented and then applied in the design of a highly loaded aspirated compressor outlet vane.

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Why is it important?

The main objective of this investigation was to introduce a compound flow control method, composed of the tandem blade and the endwall boundary layer suction, which could be used to control the complicated flow in a small outlet vane of a multi-stage aspirated compressor. By applying the proposed compound flow control method, the outlet vane could not only achieve an aggressive loading (diffusion factor>0.6) without incurring large-scale separation but also have a considerable available incidence range.