High-Temperature Component Outlet Passage Roughness Control
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Solution Overview
Problem
High-temperature components, such as those in gas turbines, face challenges with surface roughness in cooling passages, leading to increased pressure loss and reduced cooling capacity due to rough inner wall surfaces, especially in complex shapes like turbine components.
Innovation Solution
The design incorporates cooling passages with controlled surface roughness, where the outlet passage's inner wall surface roughness is managed to be no greater than the roughness of the first cooling passages at the smallest cross-sectional area, and the outlet passage includes a cross-sectional area reduction portion to adjust the flow rate, while the header portion's roughness is kept comparable to the cooling passages to minimize pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the inner wall surface roughness of cooling passages is increased to improve cooling capacity, then the cooling capacity improves, but the pressure loss of the cooling medium increases
Solution Approach 1:
The patent applies different surface roughness characteristics to different regions of the cooling passage system. The cooling passages have rough inner wall surfaces (Ra≥10μm) to enhance cooling capacity, while the outlet passage has a smooth inner wall surface (Ra<10μm) at its narrowest section to minimize pressure loss. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Adaptability or versatility
If the cooling passage has an elaborate and complicated shape to achieve complex cooling patterns, then the cooling coverage improves, but the surface roughness has a significant influence on pressure loss
Solution Approach 1:
The patent differentiates the outlet passage from the cooling passages by providing it with a smooth inner wall surface at the narrowest section, specifically addressing the region where pressure loss is most critical in complex passage systems. This allows the cooling passages to maintain elaborate shapes for cooling coverage while the outlet passage minimizes pressure loss.
3Ease of manufacture
If the surface roughness of the outlet passage is increased to match the cooling passages, then manufacturing consistency improves, but foreign substances may cause clogging
Solution Approach 1:
The patent provides the outlet passage with a smooth inner wall surface (Ra<10μm) at its narrowest section, differentiating it from the cooling passages. This local smoothness prevents clogging by foreign substances while the cooling passages maintain their rough surfaces for cooling performance.
Solution Approach 2:
The patent proactively addresses potential clogging by designing the outlet passage with a smooth surface from the manufacturing stage, preventing the accumulation and entanglement of foreign substances before they can cause blockages in the cooling medium flow.
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 configuration enhances cooling capacity, reduces pressure loss, and prevents clogging by ensuring foreign substances can pass through easily, thereby maintaining efficient cooling performance and reducing production costs.
Implementation Method 1
components constituting the machine include high-temperature components that require cooling by a cooling medium
Implementation Method 2
a metal powder laid in a layer is radiated with an energy beam such as an optical beam and an electronic beam, and layers are laminated while repeating melting and solidifying
Implementation Method 3
layers are laminated while repeating melting and solidifying
Implementation Method 4
layers are laminated while repeating melting and solidifying
Data Source
AI summary
A high-temperature component according to an embodiment is a high-temperature component which requires cooling by a cooling medium, and includes: a plurality of cooling passages through which the cooling medium is able to flow; a header portion to which downstream ends of the plurality of first cooling passages are connected; and at least one outlet passage for discharging the cooling medium flowing into the header portion to outside of the header portion. A roughness of an inner wall surface of the at least one outlet passage is not greater than a roughness of an inner wall surface of the plurality of first cooling passages in a region where a flow-passage cross-sectional area of the outlet passage is the smallest.