| XU Chengyu,WANG Yonghua,JIAO Yuandong,YU Huadong,WAN Yanling,ZHANG Qian.Rapid Preparation and Drag Reduction Properties of Bionic Shark Skin Surfaces[J],54(5):72-82 |
| Rapid Preparation and Drag Reduction Properties of Bionic Shark Skin Surfaces |
| Received:March 14, 2024 Revised:August 12, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.05.005 |
| KeyWord:bionic shark skin laser processing EDM wire cutting aluminum alloy numerical simulation |
| Author | Institution |
| XU Chengyu |
Chongqing Research Institute of Changchun University of Science and Technology, Chongqing , China;School of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun , China |
| WANG Yonghua |
School of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun , China;Key Laboratory of Cross-scale Micro and Nano Manufacturing, Changchun , China |
| JIAO Yuandong |
School of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun , China;Key Laboratory of Cross-scale Micro and Nano Manufacturing, Changchun , China |
| YU Huadong |
School of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun , China;Key Laboratory of Cross-scale Micro and Nano Manufacturing, Changchun , China |
| WAN Yanling |
School of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun , China;Key Laboratory of Cross-scale Micro and Nano Manufacturing, Changchun , China |
| ZHANG Qian |
School of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun , China;Key Laboratory of Cross-scale Micro and Nano Manufacturing, Changchun , China |
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| Abstract: |
| The work aims to investigate the method of preparing a bionic shark skin shield scale structure on the surface of aluminum alloy and examine the underwater drag reduction properties of the shark skin shield scale structure prepared by a composite processing method, providing a new idea for constructing a bionic surface. The experimental method was to construct the bionic shield scale structure in two steps with a composite processing method of laser and EDM wire cutting. In the first step, the surface of the substrate was contacted with the molybdenum wire of the wire-cutting machine at an angle of 45°. The cutting path was mimicked to the outline of the shield scales, the spacing of each shield scale was set to 0.65 mm, and the height of each shield scale was set to 0.4 mm. Following the first cutting, the workpiece was rotated by 90° and cut continuously in the same way. The primary structure of the shield scale of the bionic shark skin was completed. In the second step, a nanosecond laser marker was used to etch the microgroove morphology on the surface of the primary structure by setting the laser scanning path spacing to 0.08 mm, the laser power to 12 W, and the scanning speed to 100 mm/s. After the completion of the laser processing, the bionic shark skin shield scale array structure was prepared. The drag reduction test was partly based on the flow-slip theory, and the structural simulation of the array was calculated in COMSOL, comparing the smooth surface, the surface of the primary shield scale array structure, and the surface of the secondary array structure of the bionic shield scales, and observing the wall shear stress, the surface viscous force, and the velocity streamlines, respectively. The test results show that the wall shear stress is minimized when the inclination angle of the shield scale is 13°, the spacing of the grooves on the shield scale surface is 0.17 mm, and the depth of the grooves is 0.08 mm. The surface of the primary shield scale structure and the surface of the secondary bionic shield scale structure both show certain drag reduction properties in the velocity streamline diagram, and the difference between them is that the streamline of the latter is more stable. In the drag reduction test, the parameters of the prepared test piece are 16° shield scale inclination angle, 0.17 mm shield scale groove spacing, and 0.08 mm groove depth, and the drag reduction rate can reach about 35%. It is concluded that the surface of the bionic shark skin shield scale array structure prepared by the composite processing method of laser and wire cutting has excellent underwater drag reduction properties. The machining of the appropriate inclination angle of the shield scales, the spacing of the grooves, and the appropriate depth of the grooves can effectively improve the drag reduction properties of the bionic surface. |
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