Turbine Cooling Hole With Diffusing Section
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Solution Overview
Problem
Turbine engines face challenges in effectively cooling components due to high temperatures, particularly in the turbine section, where conventional cooling methods may not adequately manage heat dissipation and fluid flow efficiency.
Innovation Solution
The design incorporates cooling holes with a connecting passage that includes a diffusing section and a non-diffusing section, where the cooling fluid flows through the diffusing section to expand and then through the non-diffusing section to form an extended flow, which is exhausted along the exterior of the engine component to create a cooling fluid film, enhancing heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling holes with uniform cross-section are used, then the structure is simple, but the cooling fluid flow efficiency and heat dissipation performance are insufficient
Solution Approach 1:
The cooling hole is divided into multiple sections along its length: an inlet section, a diffusing section with diverging sidewalls, and a non-diffusing section with parallel sidewalls. This segmentation allows each section to perform a specific function - the diffusing section expands the cooling fluid to improve coverage, while the non-diffusing section maintains a focused jet for targeted cooling, thereby enhancing overall heat dissipation performance without requiring overly complex structures
Solution Approach 2:
The cooling hole geometry transitions from a static uniform cross-section to a dynamic varying cross-section. The diffusing section features sidewalls that diverge at specific angles to adapt the flow characteristics of the cooling fluid, creating an expanding cross-sectional area that optimizes fluid distribution and cooling effectiveness across different operational conditions
2Area of stationary object
If the diffusing section extends to the outlet, then the cooling fluid coverage is maximized, but the cooling fluid jet velocity and targeted cooling capability are reduced
Solution Approach 1:
The cooling hole is segmented into a diffusing section and a non-diffusing section. The diffusing section expands the cooling fluid coverage area by diverging sidewalls, while the non-diffusing section maintains parallel sidewalls to preserve jet velocity and targeted cooling capability. This segmentation resolves the contradiction by providing both wide coverage and high-velocity jet functions in different sections
Solution Approach 2:
Different sections of the cooling hole are given different geometric qualities - the diffusing section has diverging sidewalls to maximize coverage area, while the non-diffusing section has parallel sidewalls to maintain jet velocity. Each section is optimized for its specific function, allowing the system to achieve both wide coverage and high-speed jet performance locally where needed
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 improves heat dissipation by forming a cooling fluid film along the heated surfaces, effectively managing temperature and extending the flow to enhance cooling efficiency and stability across the engine component.
Implementation Method 1
flowing the cooling fluid flow through a diffusion section of the at least one cooling hole and prior to emitting the cooling fluid flow from the outlet to form a diffused airflow
Implementation Method 2
exhausting the extended flow along an exterior of the wall to form a cooling fluid film
Data Source
AI summary
An apparatus and method for a component for a turbine engine, which generates a hot gas flow, and provides a cooling fluid flow, comprising a wall separating the hot gas flow from the cooling fluid flow and having a heated surface along which the hot gas flows and a cooled surface facing the cooling fluid flow and at least one cooling hole comprising a connecting passage extending between an inlet at the cooled surface and an outlet located at the heated surface, with the connecting passage comprising a diffusing section.