Arc Protrusion Surface Structure for High-Speed Drag Reduction
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Solution Overview
Problem
Current methods for reducing fluid resistance and rectification on moving objects, such as streamlined shapes, are ineffective at high speeds, leading to significant energy consumption and noise, especially for internal surfaces and fluid-related devices like aircraft and ships, which also suffer from noise and vibration issues due to internal structural defects.
Innovation Solution
The implementation of an object surface structure featuring arc protrusions, either rotatable or fixed, arranged in specific layouts such as matrix, quincunx, or supplementary layouts, which reduce fluid resistance and rectify fluid flow by minimizing contact areas and altering fluid dynamics, thereby reducing friction and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If smooth streamlined surface is adopted, then resistance reduction is achieved at low speeds, but resistance becomes prominent at high speeds
Solution Approach 1:
The patent divides the surface into multiple discrete arc protrusions arranged in arrays rather than using a continuous smooth surface. This segmentation allows the surface to interact with fluid in a controlled manner, reducing resistance at high speeds by preventing large-scale eddy currents and shock waves while maintaining effectiveness across a wider speed range.
Solution Approach 2:
The patent employs arc-shaped protrusions with specific curvature radii (0.001-0.1 times the spacing between protrusions) to optimize fluid flow interaction. The curved surfaces of these protrusions help guide fluid flow more effectively than flat or sharp-edged features, reducing turbulence and resistance particularly at high velocities.
2Use of energy by moving object
If smooth surface is used, then manufacturing is simple, but resistance reduction effect is limited and energy consumption is high
Solution Approach 1:
The surface is segmented into discrete arc protrusions that can be manufactured using additive manufacturing or other modern techniques. While more complex than a smooth surface, the modular nature of these protrusions allows for systematic production and potential standardization, making the increased complexity manageable while achieving significant energy savings through reduced drag.
Solution Approach 2:
The patent specifies particular parameter ranges for the arc protrusions (height: 0.001-0.01 times characteristic length, curvature radius: 0.001-0.1 times spacing) to optimize the balance between manufacturing feasibility and performance. These parameter constraints guide the manufacturing process while ensuring the structure delivers the required resistance reduction and energy efficiency.
3Object-generated harmful factors
If streamlined shape is adopted, then clutter and eddy current are reduced, but shock waves and acting force remain prominent at high speeds
Solution Approach 1:
By segmenting the surface into discrete arc protrusions, the patent prevents the formation of large continuous eddy currents and shock waves that occur on smooth streamlined surfaces at high speeds. The segmented structure breaks up fluid flow into smaller, more manageable patterns that reduce overall drag and harmful fluid dynamic effects across all speed regimes.
Solution Approach 2:
The arc-shaped protrusions with optimized curvature radii create more gradual fluid flow transitions compared to sharp edges or flat surfaces. This curvature helps reduce shock wave formation and acting forces by smoothing out pressure gradients and flow separation, particularly effective at high velocities where compressibility effects become significant.
Data Source
AI summary
Provided are an object surface structure for reducing fluid resistance and rectifying fluid, and a preparation method. The surface structure includes a basic surface of an object, arc protrusions formed by a plurality of cambered surface-shaped protrusions are distributed on the basic surface in an array; a rotatable object with an cambered surface in the pit on the basic surface is exposed to the cambered surface outside the pit to form a rotatable arc protrusion; or an cambered surface-shaped object fixed on the basic surface or an arc-shaped protrusion integrated with the basic surface forms a fixed arc protrusion; and the object surface structure provided with the plurality of arc protrusions forms an arc protrusion surface structure. With the application, the purposes of improving moving efficiency, reducing energy consumption of advancing apparatuses, improving advancing efficiency, reducing noise, reducing resonance and improving controllability of a moving object are achieved.