Underwater drag-reduction surface simulating scarfskin morphology of puffer and preparation method

Abstract

The invention discloses an underwater drag-reduction surface simulating scarfskin morphology of a puffer and a preparation method. The underwater drag-reduction surface simulating the scarfskin morphology of the puffer comprises a basement, hard drag reduction elements, and soft cover layers, wherein a plurality of hard drag reduction elements are distributed on the basement, the soft cover layers are filled among the hard drag reduction elements, and the hard drag reduction elements are tightly attached to the joint surface of the basement and the hard drag reduction elements. By adoption of the tapered or columnar hard drag reduction elements, the underwater drag-reduction surface simulating the scarfskin morphology of the puffer is different from the existing rib-shaped groove structure; and the soft layers are covered on the basement and form the rigid-flexible drag reduction surface which can form adaptive variations with differences of water velocity on the surface and fit with the scarfskin properties of the puffer better.

Description

technical field [0001] The invention relates to an underwater drag-reducing surface imitating the shape of puffer fish skin and a manufacturing method, belonging to the field of underwater bionic drag-reducing. Background technique [0002] Ships, submarines, torpedoes and other underwater vehicles have differential pressure resistance, surface frictional resistance and wave-making resistance during navigation. Small size has become an important channel to solve the problem of drag reduction and efficiency increase of underwater vehicles. The bionic drag reduction technology based on the swimming performance of aquatic species is an effective technical means. [0003] Existing surface drag reduction technologies use sharks as bionic objects, including rib non-smooth surfaces imitating shark shield scale grooves (ZL201410061037.5, ZL201110270722.5, etc.), composite drag reducing surfaces imitating shark skin mucus (ZL201110261668.8, ZL201210120754 .1, etc.) and production me...

AI Technical Summary

Problems solved by technology

The effect of drag reduction is realized by imitating the groove shape of shark scales and the coupling effect of the secretion of drag-reducing fluid under high-speed movement of sharks. However, when this structure is used in practice, there are some problems: (1) This structure is installed on the surface of the aircraft. The shark-like skin structure contains a circuit control system inside, and its design is relatively complicated. At the same time, the layout of the circuit control system, the connection of electronic components, and the use of large-sized aircraft will be restricted; (2) to ensure The smoothness of the internal liquid storage tank and the external through hole is difficult to achieve and has no practical significance. Once the internal and external slow-release electro-hydraulic channels are blocked, the effect of secreting mucus under the high-speed motion of a shark will be lost; (3) The production cost and operating cost are relatively high. Regardless of the size of the underwater vehicle, if this drag reduction method is used, a large number of electronic components in the slow-release electro-hydraulic control system will be arranged on the surface of the vehicle. The maintenance cost is too high. Once a problem occurs in a certain part, the whole system will not be able to operate; (4) Although the installation of the slow-release electro-hydraulic control system is more suitable for the drag reduction behavior of the actual shark in high-speed movement in principle, the internal device The surface with a control system will inevitably affect the drag reduction effect of the imitation shark scale skin structure on the upper surface, which instead restricts the drag reduction effect of the imitation shark scale non-smooth structure

[0005] The existing shark / shell-like drag-reducing surfaces are all in the shape of rigid ribs, including rigid-flexible drag-reducing and noise-reducing surfaces. Significant differences exist in the elasticity of biological epidermal fat layers

In addition, the existing drag-reducing surface manufacturing methods mostly use micromachining, spraying, film-sticking and other processes, and it is difficult to apply large-area outer walls of underwater vehicles such as ships, submarines, and torpedoes, and the drag-reducing surface is easy to separate from the aircraft body. or fall off

Generally speaking, the existing surface bionic drag reduction technology has disadvantages such as complex structure, high cost, high operating cost, cumbersome control methods, complex structural design, and poor practicability.

Images