Riblet-Coated Blade Surface for Lower Drag and Heat Transfer
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Solution Overview
Problem
Existing turbine blades face challenges in reducing fluid resistance, particularly due to the lack of effective surface structures that can enhance fluid dynamics and heat management.
Innovation Solution
The proposed solution involves a blade design with a base member and a coat layer featuring a riblet structure and a combination of first and second grooves with different pitches, depths, or intervals, optimized for fluid flow and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a smooth surface is used on the blade, then manufacturing is simple, but fluid resistance is high
Solution Approach 1:
The blade surface is segmented into multiple groove structures (first grooves and second grooves) with different pitches, depths, or intervals. This segmentation creates a riblet structure that reduces fluid resistance by manipulating flow patterns, while the grooves are formed through a systematic process that maintains manufacturing feasibility.
Solution Approach 2:
Different regions of the blade surface have different groove characteristics - the first grooves and second grooves have different pitches, depths, or intervals tailored to specific local flow conditions. This local optimization allows each region to address fluid resistance effectively while maintaining overall blade performance.
2Object-affected harmful factors
If a complex groove structure is formed on the blade surface, then fluid resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The complex surface structure is divided into two distinct groove systems (first grooves and second grooves) with different characteristics. This segmentation allows each groove type to be optimized for specific functions while simplifying the overall manufacturing approach compared to creating a completely random or uniformly complex structure.
Solution Approach 2:
The groove structures vary parameters such as pitch, depth, or interval systematically. By changing these parameters in a controlled manner between the first and second grooves, the patent achieves reduced fluid resistance through a structured variation rather than arbitrary complexity, making the manufacturing process more manageable.
3Temperature
If the coat layer is made thicker to reduce heat transmission, then heat management improves, but fluid resistance increases
Solution Approach 1:
The coat layer incorporates localized groove structures (riblets) on its surface that modify fluid flow characteristics. This allows the thick coat layer to maintain its heat insulation function while the surface riblet structure independently addresses fluid resistance, decoupling these two functions so that one does not compromise the other.
Solution Approach 2:
The coat layer's surface is segmented into groove and non-groove regions, creating a riblet structure that manipulates fluid flow. This segmentation allows the bulk of the coat layer to provide thermal insulation while the surface segmentation provides aerodynamic benefits, enabling both thick coat construction and low fluid resistance to coexist.
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
This design effectively reduces fluid resistance and enhances heat management by creating a surface topology that improves fluid dynamics and reduces heat transmission from the fluid to the blade's base member.
Implementation Method 1
a beam irradiation apparatus that is configured to irradiate a surface of a coat layer, which is formed on a base member and on which a plurality of second grooves are formed, with an energy beam
Data Source
AI summary
A blade is used in fluid and includes: a base member; and a coat layer that is formed on the base member, a plurality of first grooves and a plurality of second grooves are formed on a surface of the coat layer, a pitch of the plurality of first grooves is different from a pitch of the plurality of second grooves.