Numerical and experimental investigation of flow loss and flow structure of circular arc cambered plate blade cascade

Abstract

Due to the low production cost, circular arc blades are often applied to axial fans as outlet guide vane. At present, there is less available information focusing on the flow loss and flow structure of circular arc blades in the open literature. In particular, the influence of leading edge and trailing geometries on the aerodynamic performance of circular arc blades remains unknown. In this study, the circular arc blades edge with different leading edge and trailing edge are investigated and compared with numerical and experimental methods to detect the aerodynamic performance of the circular arc blades and the influence of their leading edge and trailing edge on the flow loss and flow structure. The flow loss and turning angle of both investigated blades are shown to dependent on the incidence angle. The flow structures of both blades are built on the basis of numerical and experimental oil-flow pictures. Additionally, the separation bubbles at the leading edge of the blade and the distribution of the flow loss on the measuring plane are shown and discussed.