High-Temperature Component Cooling Passage Flow Control
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Solution Overview
Problem
High-temperature components in machines like gas turbines face inefficiencies in cooling, leading to decreased thermal efficiency due to either excessive or deficient cooling, often resulting from inaccurate flow rate control in cooling passages, which can be attributed to production constraints and dimension accuracy issues.
Innovation Solution
A high-temperature component design featuring a plurality of cooling passages with a header and fewer outlet passages, where the minimum flow passage cross-sectional areas of the outlet passages are not less than those of the cooling passages, allowing for precise flow rate control and improved dimension accuracy, reducing the risk of blockages and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the flow passage cross-sectional area in cooling passages is reduced to minimize cooling medium usage, then thermal efficiency is improved, but dimension accuracy of the cooling passages decreases due to production constraints
Solution Approach 1:
The invention segments the flow control function by introducing a separate throttle passage distinct from the cooling passages. The cooling passages maintain larger cross-sectional areas for manufacturing accuracy, while the throttle passages (with fewer passages) control the total flow rate. This segmentation allows each type of passage to be optimized for its specific function without compromise.
Solution Approach 2:
The invention applies local quality by giving different cross-sectional area characteristics to different parts of the cooling system. The cooling passages have uniformly larger cross-sectional areas to ensure manufacturing accuracy, while the throttle passages have smaller total cross-sectional area to control flow rate. This local differentiation resolves the contradiction by assigning appropriate geometric properties to specific functional zones.
2Loss of energy
If the flow passage cross-sectional area is small to control cooling medium flow rate, then excess cooling is suppressed, but accuracy of the flow rate of cooling air decreases
Solution Approach 1:
The invention separates the flow control function into dedicated throttle passages that are distinct from the cooling passages. The throttle passages (being fewer in number) provide precise flow rate control through their smaller total cross-sectional area, while the cooling passages maintain larger areas for accurate manufacturing. This functional segmentation enables independent optimization of flow rate control accuracy and manufacturing precision.
3Device complexity
If the number of outlet passages is reduced to simplify the structure, then device complexity is reduced, but flow rate control accuracy may be compromised
Solution Approach 1:
The invention segments the passage system into cooling passages and throttle passages with distinct functions. The throttle passages (fewer in number) are specifically designed for flow rate control, while the cooling passages handle coolant distribution. This segmentation allows the system to achieve accurate flow control with fewer outlet passages, reducing device complexity without sacrificing control accuracy.
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 avoids deficiencies in cooling capacity while preventing excessive cooling by maintaining accurate flow rates and ensuring dimension accuracy, thus enhancing the thermal efficiency and reliability of high-temperature components.
Implementation Method 1
a high-temperature component which is used for a turbomachinery and needs to be cooled by a cooling medium, the component including a plurality of cooling passages through which the cooling medium can flow
Data Source
AI summary
A high-temperature component including a plurality of cooling passages through which the cooling medium can flow, a header connected to respective downstream ends of the plurality of cooling passages, and one or more outlet passages for discharging the cooling medium flowing into the header to outside of the header. The one or more outlet passages are less in number than the plurality of cooling passages. Respective minimum flow passage cross-sectional areas of the one or more outlet passages are not less than respective flow passage cross-sectional areas of the plurality of cooling passages in a connection between the header and the cooling passages. A sum of the respective minimum flow passage cross-sectional areas of the one or more outlet passages is less than a sum of the respective flow passage cross-sectional areas of the plurality of cooling passages in the connection between the header and the cooling passages.