The energy conversion device with flexible blades was taken as the research object; in the closed experimentation section of the low speed wind tunnel,velocity field of curved blade boundary layer was tested by PIV measure technology; when camber of the blades was changed,the rule of flow separation and vortex motion on the boundary layer were obtained. The experimental results showed that the bending deformation of blades in the front layer can reduce accumulation and diffusion low-energy fluid on the boun...