Computational results to assess the effectiveness of non-axisymmetric endwall contouring in a low-speed axial fan were presented. The endwall was designed by geometric scaling of a prior optimized endwall. Results showed that the isentropic efficiency and total pressure rise coefficient at 100% design speed increased

and the performance of the contoured endwall (CEW) at near stall condition was better than that at the near choke point. Besides

the CEW got 1.27% isentropic efficiency and 2.97% total pressure rise coefficient increased at peak efficiency point. According to the mechanism of the improvement of CEW

the adverse pressure gradient (APG) had been reduced through the groove configuration near the leading edge of the suction surface. Moreover

there was an optimum depth for the groove configuration of this axial fan

which was equal to about 5.73% chord length at stator hub.