Air film drag reduction model based on wettability regulation and its fabrication method
A wettability, gas film technology, applied in the field of gas film drag reduction and underwater drag reduction based on the control of the wettability of the solid surface, can solve the problems of poor drag reduction effect and narrow flow velocity range, and achieves processing difficulty and cost. Low, easy to operate, to achieve continuous effect
Active Publication Date: 2019-01-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0003] In order to overcome the shortcomings of narrow applicable flow velocity range and poor drag reduction effect in the prior art, the present invention proposes a gas film drag reduction model based on wettability regulation
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Embodiment 1
[0032] This embodiment is an air film drag reduction model based on wettability control.
[0033] The air film drag reduction model is in the form of a flat plate, including an upper aluminum plate 1 and a lower aluminum plate 12, and an air chamber 5 is located between the upper aluminum plate and the lower aluminum plate. The intrinsic contact angle of the upper aluminum plate is 42°.
[0034] The upper surface of the upper aluminum plate 1 of the gas film drag reduction model is a drag reduction layer. The drag-reducing layer is composed of a plurality of hydrophilic regions 3 and a plurality of super-hydrophobic regions 2, and the hydrophilic regions and super-hydrophobic regions are arranged alternately, so that the drag-reducing layer is grid-like; the mesh The grid shape is quadrilateral, or hexagonal, or triangular, or circular; in this embodiment, the grid shape is quadrilateral.
[0035] Such as figure 1 shown. The intrinsic contact angle of each hydrophilic reg...
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The invention provides an air film resistance reducing model based on wettability regulation. An air film resistance reducing layer of the air film resistance reducing model is composed of multiple hydrophilic areas and multiple super-hydrophobic areas. The multiple hydrophilic areas and the multiple super-hydrophobic areas are distributed in an alternating mode. The intrinsic contact angle of each hydrophilic area is smaller than 42 degrees. The intrinsic contact angle of each super-hydrophobic area is larger than 165 degrees. Compared with supercavitation resistance reduction, energy consumption of the model is smaller, and the machining difficulty and cost are lower; compared with ventilating air film resistance reduction, an air film can be maintained by one-time micro-scale ventilation, limitation to the shape of a navigation body is avoided, and the air film is suitable for water surface ships and underwater vehicles. Compared with super-hydrophobic surface resistance reduction, the air film can be maintained stably, and persistence and effectiveness of the resistance reducing effect are achieved; meanwhile, by adjusting distribution shapes and areas of the hydrophilic and hydrophobic areas of the surface of the model and the thickness of the air film, the different resistance reducing effects can be achieved, and practical engineering application can be achieved easily.
Description
technical field [0001] The invention relates to an underwater drag reduction method, in particular to a gas film drag reduction method based on solid surface wettability control, and belongs to the technical field of drag reduction. Background technique [0002] The resistance suffered by surface ships and underwater vehicles mainly includes pressure difference resistance, wave resistance and friction resistance, among which friction resistance accounts for the most important part, accounting for about 50%-80% of the total resistance. Therefore, reducing surface frictional resistance has important practical significance for increasing the speed and range of surface ships and underwater vehicles; it also has important economic significance for saving energy consumption in the shipping process. Because the viscosity of gas is much lower than that of water, people began to try to build a stable gas-phase structure underwater to achieve drag reduction. In this way, the liquid-so...
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IPC IPC(8): G09B23/12
CPCG09B23/12
Inventor 胡海豹文俊杜鹏王德政宋东鲍路瑶
Owner NORTHWESTERN POLYTECHNICAL UNIV