The samples of the pigeon surface were prepared as our research objective. The feature of the pigeon surface was analyzed by using the OLYMPUS stereo microscope and its image analysis system OLYCIATMM3. It was observed that the macro structure of pigeon body surface was non-smooth. Also, the drag reduction characteristic of the surface was resulted from the coupling effect of several factors. Based on our observation, we further designed a coupling functional surface model using shape and structure, with the assumption that it was attached to a flat plane in the air. We then used numerical simulation to analyze and compare the velocity, turbulence and force of the bionic coupling functional surface against those corresponding factors of the smooth surface in the flow field. Our results show that the drag of the bionic coupling functional surface can decrease by 8.89%. The basic interpretation to the drag reduction of the coupling functional surface lies in its effectively control or modification over the boundary layer. Our research renders theoretic support for the future development on applications of bionic coupling functional surfaces.
展开▼
