Preparation method of a drag-reducing surface of a sandwich-structured smart hydrogel material

Abstract

A preparation method of a sandwich-structured intelligent hydrogel material drag reduction surface belongs to the technical field of surface drag reduction. The method comprises the following steps: preparing a required solution, making a resin template through a 3D printing technology, sequentially making three surface films, and dissolving the resin template by a tetrahydrofuran solution to realize demolding in order to complete the production of the sandwich-structured intelligent hydrogel material drag reduction surface. An ultrafine heating screen controls the temperature of temperature-sensitive hydrogel in order to change the volume of the temperature-sensitive hydrogel, so the dimension change of grooves in the drag reduction surface is realized, thereby a navigation body can adapt to the structure of a flow field structure in an all-condition state, the wall surface friction resistance is reduced, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of surface drag reduction, and in particular relates to a method for preparing a sandwich-structured smart hydrogel material drag-reduction surface. Background technique [0002] When underwater vehicles such as submarines and torpedoes navigate in the ocean, due to the viscous friction resistance generated by the interaction with seawater flow, the speed, range and combat performance of underwater weapons will be reduced. In addition, the energy consumed by underwater vehicles to overcome surface viscous frictional resistance is an important part of the world's energy consumption today. Therefore, reducing the viscous frictional resistance produced on the surface of underwater vehicles plays an important role in the entire underwater drag reduction technology. [0003] Near-wall turbulent boundary layer control drag reduction technology has always been a hot topic of great concern to researchers at home an...

AI Technical Summary

Problems solved by technology

Temperature-sensitive hydrogel has thermoreversible properties, and is the material of choice to realize the intelligent response of bionic surfaces to flow field parameters. Its volume can change with the change of external temperature. At 33°C, the temperature-sensitive hydrogel swells with a large amount of water, and the volume increases; when the external temperature exceeds 33°C, the temperature-sensitive hydrogel will suddenly shrink and lose water, causing the gel volume to collapse, but the temperature-sensitive hydrogel Gel has weak mechanical strength, poor durability, and no resistance to fluid shear force. In order to solve this problem, a drag-reducing surface composited with multi-layer hydrogel materials is proposed to improve the mechanical strength of the hydrogel. Active drag-reducing technology and passive The method of combining drag reduction technology together realizes the intelligent control of turbulent boundary layer to achieve the best drag reduction effect

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