Research On Drag Reduction Designation Of Biomimetic Trenches And Superhydrophobic Surface

With the worsening of environmental pollution and the gradually exhaustednon-renewable energy resources, the sustainable development model with low carbonenvironmental protection has been a common goal for human. So, Drag reduction is a hottopic in today’s society. Through change the ship’s surfaces of structure in due to reduce thesurface frictional resistance. In many drag reduction technology, bionic surface drag-reducingtechnology for its good effective, low cost, and easy to implement, becoming the mostpopular investigation of object. The Navigation surface of drag reduction is the best possiblethat through reduction of the surface friction force. Bionics and Super-hydrophobic surfacesdrag reduction technology are representative of the bionic drag reduction technology. Nowthese two drag reduction technology has been applied to ship, pipeline transportation, sportscompetitions and other areas. Based on bionics principle. The traveling wave drag abstractrectangular trench to study the impact of the groove geometry and flow velocity of the fluidstate and drag reduction. By using ANSYS workbench, ANSYS ICEM, ANSYS Fluentsoftware for modeling, simulation division and its size, mesh size on analysis of the trenchflow velocity gradient effects, and the impact of the grooves on the fluid pressure drag. Theresults showed that: a rectangular groove ball-type fluid vortex generated, while reducing thefluid velocity gradients, thereby reducing the fluid viscosity resistance, when the groovewidth of0.1~1mm, height greater than5mm trench having drag reduction, the maximumdrag reduction of30%. Superhydrophobic surface has many excellent properties and iswidely used in industry and people’s lives, particularly their drag reduction performance. Theresearch shows that the superhydrophobic surface must have the following characteristics: acomposite structure having a Wiener, b has a low surface energy, the key is prepared structure.This paper was prepared using morphology arc spraying superhydrophobic coating, and usingdodecafluoroheptyl base trimethoxysilane its low surface modification, to get the maximum contact angle of151°. Using resistance tester to test its resistance to explore theimpactresistance properties of the hydrophobic surface, while the drag reduction studies underdifferent pressure.