Structured Surface Guide Geometry for Drag and Separation Reduction
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Solution Overview
Problem
Existing technologies face challenges in reducing pressure resistance and frictional resistance experienced by objects as fluids flow over their surfaces, leading to separation and increased drag.
Innovation Solution
A structured body with a first face that includes frictional and smooth portions, where the frictional portions are arrayed with guide structures that guide the fluid to smooth portions at an inclination angle less than 90 degrees, promoting vortex generation and mixing to reduce separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a rough face with recesses and protrusions is installed on the object surface to suppress fluid separation, then pressure resistance is reduced, but frictional resistance increases
Solution Approach 1:
The invention applies local quality by creating distinct frictional portions and smooth portions in specific patterns on the object surface. The frictional portions with guide structures are strategically placed to generate vortices where needed, while smooth portions are positioned to reduce friction in other areas. This localized differentiation allows the surface to simultaneously reduce pressure resistance through vortex generation while controlling frictional resistance through smooth regions.
Solution Approach 2:
The invention segments the object surface into multiple functional regions including frictional portions with guide structures and smooth portions. This segmentation allows different areas to perform different functions: frictional portions generate vortices to suppress separation and reduce pressure resistance, while smooth portions minimize frictional resistance. The guide structures within frictional portions are further segmented into multiple elements arranged in specific patterns to optimize vortex generation.
2Object-generated harmful factors
If guide structures with large inclination angles are used to guide fluid to smooth portions, then vortex generation is enhanced, but fluid flow resistance increases
Solution Approach 1:
The invention applies parameter changes by optimizing the inclination angle of guide structure end portions to be greater than 0° and less than 90° relative to the longitudinal direction. This specific angular parameter range enables effective vortex generation to suppress fluid separation while avoiding excessive fluid flow resistance. The patent further optimizes additional parameters including the spacing between guide structures, their width, and the length of smooth portions to achieve balanced performance.
Solution Approach 2:
The invention uses partial action by implementing guide structures with moderate inclination angles rather than extreme angles. The end portions of guide structures are designed with inclination angles between 0° and 90° to generate sufficient vortices for suppressing separation without creating excessive resistance. This partial approach balances vortex generation effectiveness with acceptable fluid flow resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structured body effectively reduces pressure resistance and frictional resistance, suppressing fluid separation and enhancing fluid flow, thereby minimizing drag.
Implementation Method 1
the first end portion has a first inclination angle that is greater than 0° and smaller than 90° with respect to the planar first direction... promoting vortex generation and mixing to reduce separation
Implementation Method 2
At the boundary layer, the fluid receives frictional force, due to viscosity, from the surface of the object
Implementation Method 3
In a case of a fluid flowing along an object, a boundary layer is formed between a surface of the object and the fluid
Data Source
AI summary
A structured body for reducing resistance of a fluid includes a first face that comes into contact with the fluid, a frictional portion that is situated on the first face and that spreads in a planar first direction along the first face, and a first smooth portion that is situated on the first face and that is adjacent to the frictional portion in a planar second direction that intersects the planar first direction. The frictional portion includes a plurality of first guide structures that are arrayed in the planar first direction and that guide the fluid to the first smooth portion. The first guide structures each include a first end portion that extends toward the first smooth portion. The first end portion has a first inclination angle that is greater than 0° and smaller than 90° with respect to the planar first direction.