Air film drag reduction model with wetting step effect and preparation method thereof

Abstract

The invention discloses an air film drag reduction model with a wetting step effect and a preparation method thereof. The air film drag reduction model comprises a model sample, the model sample is composed of a plurality of hydrophilic areas and hydrophobic areas, the hydrophilic areas and the hydrophobic areas are arranged alternately, the hydrophilic areas are shaped like pits, the static contact angle of each hydrophilic area is smaller than 90 degrees, and the static contact angle of each hydrophobic area is smaller than 90 degrees; and the static contact angle of each hydrophobic regionis greater than 150 degrees. A hydrophilic-hydrophobic alternate grid structure is constructed on the surface of the model, a wetting step effect can be generated on the wall surface, and binding force for restraining liquid-gas-solid three-phase contact line movement is generated; according to the scheme, a regular microstructure characteristic morphology is constructed on the surface of a sampleby adopting a laser ablation method, a low-surface-energy substance stearic acid is used for assisting in modification to reduce surface free energy, and a hydrophilic and hydrophobic super-hydrophobic surface is constructed to achieve a drag reduction effect. Compared with the prior art, the method has the advantages of simplicity and feasibility in operation, high processing efficiency, low cost, no harm to the environment and the like.

Description

technical field [0001] The invention belongs to the technical field of underwater drag reduction, in particular to an air film drag reduction model with a wetting step effect and a preparation method thereof. Background technique [0002] Microwave With the change of ocean development and coastal defense situation, my country's ocean exploration and development continue to extend from near sea to far sea and deep sea, and most of the exploration and research on deep sea rely on underwater vehicles to reduce the resistance of the navigation body and reduce the navigation within the unit voyage It is of great practical significance to reduce the energy consumption of the aircraft and increase the range and effective working time of the aircraft. In addition, due to its low shipping cost, sea transportation has an unparalleled cost advantage and has become the main mode of global cargo transportation. With the depletion of oil resources and the aggravation of global warming, it ...

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Problems solved by technology

[0005] This solution is to avoid the defects of the existing technology, and overcome the problems of the existing technology such as small applicable flow rate, complicated equipment, expensive price, poor durability, and high energy consumption.

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