Numerical study of positively curved blade in aspirated compressor cascade based on transition model

Three-dimensional numerical method is adopted to study the flow field and aerodynamic performance of an aspirated compressor cascade with positively curved blades. Through a comparative analysis of three different hole-type suction schemes, the mechanisms of boundary layer suction inhibiting the 3D flow separation and reducing the loss were discussed. Firstly, the reliability of numerical calculation code is checked against the experimental data available from literature. The numerical flow-field characteristics has good agreement with the experimental data. Then, the effects of blade stacking styles on boundary layer suction are analyzed by using hole-type aspiration in straight and positively curved cascade, respectively, and the mechanisms for increasing the aspiration effect by improving aspiration-hole design schemes are discussed. The results show that the hole-type aspiration can control the three-dimensional flow separation well both in straight and positively curved cascades. With aspirated, the separation bubble on suction surface disappears and the new separation flow structures based on the aspiration-hole characteristics are generated at the downstream of the aspiration holes. The aspiration strategies are adjusting to improve the three-dimensional separation flow in the corner, therefore the development and intensity of wake vortex are restrained obviously.