Preparation and Drag Reduction Performance of Grooved Micro-Nano Composite Structure Surface
ZHANG Chunlai1, ZHANG Lixia2, WANG Xiao1, WU Yintao1, WANG Bo1,*
1 Materials and Manufacturing Department, Beijing University of Technology, Beijing 100124, China 2 Lab.3, Defense Research and Test Center, China Aerospace Science & Industry Corp., Beijing 100854, China
Abstract: Grooved microstructure drag reduction and hydrophobic surface drag reduction are two effective underwater drag reduction techniques. The two typical drag reduction methods were combined and synergized. After the micro-scale trench structure was constructed by laser micro-engraving technology on the surface of the PETG substrate, the epoxy resin layer and the modified nano-scale SiO2 particles were successively covered on the surface of the micro-groove by a two-step spraying method, so as to realize the preparation of the surface of grooved micro-nano composite structure. The surface wettability, underwater gas film state and underwater drag reduction performance of the prepared surfaces were analyzed by contact angle measuring instrument, stereo microscope and dragging friction resistance testing equipment. Results showed that the surface of the grooved micro-nano composite structure is a superhydrophobic surface, and the surface droplets are in the ‘Cassie-Baxter’ wet state. When underwater, the surface of the composite structure has the ability to bind a large-scale gas film, and the gas film resides in the surface grooves and promotes the underwater drag reduction effect of the surface. Comparing the surface of a simple groove microstructure with a smooth surface coated with SiO2 particles, the maximum drag reduction rate can reach 20.82% when the surface moves along the diction prependicular to the grooves. Meanwhile, the stability of surface air film is also optimal.
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2023, Vol. 37 
