Turbine Blade Cooling Hole Density Gradient
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Solution Overview
Problem
Existing turbine blade cooling technologies do not effectively address temperature and pressure distributions within the cooling passages, leading to inefficient cooling of the blade.
Innovation Solution
The turbine blade features a cooling passage with cooling holes arranged in a specific density distribution along its height, with higher densities downstream and lower densities upstream, matching the temperature and pressure gradients to optimize cooling medium flow and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cooling holes are uniformly distributed along the blade height, then manufacturing is simple, but cooling efficiency is insufficient due to temperature distribution in the cooling passage
Solution Approach 1:
The patent applies local quality by varying the opening density of cooling holes along the blade height direction. The cooling holes are arranged with different opening densities in different regions: higher density in regions requiring more cooling and lower density in regions requiring less cooling. This non-uniform distribution optimizes cooling efficiency for each specific location based on its thermal conditions, resolving the contradiction between manufacturing simplicity and cooling effectiveness.
2Reliability
If cooling holes are arranged with higher opening density downstream, then cooling efficiency improves where temperature is higher, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the opening density parameter of cooling holes along the blade height direction. The opening density is changed as a continuous or stepped parameter from upstream to downstream regions, creating a gradient distribution that adapts to temperature variations. This controlled parameter variation improves cooling efficiency while maintaining manageable manufacturing complexity through systematic design.
3Reliability
If cooling medium flow rate is increased throughout the blade, then cooling efficiency improves, but energy loss increases
Solution Approach 1:
The patent applies local quality by distributing cooling medium flow according to local thermal requirements. Regions with higher temperature and greater cooling demand receive higher cooling medium flow rates through increased cooling hole opening density, while regions with lower temperature receive reduced flow rates. This localized flow distribution achieves effective cooling throughout the blade while minimizing overall cooling medium consumption and associated energy losses.
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 the cooling efficiency by increasing the supply flow rate of the cooling medium where it is needed most, effectively managing temperature and pressure distributions within the blade, thereby preventing overheating and damage.
Implementation Method 1
a turbine blade exposed to a high-temperature gas flow or the like is cooled by flowing a cooling medium to a cooling passage formed inside the turbine blade
Implementation Method 2
Since the cooling medium flows in the cooling passage formed inside the airfoil portion while cooling the airfoil portion, a temperature distribution may occur
Data Source
AI summary
A turbine blade includes an airfoil portion, a cooling passage inside the airfoil portion, and a plurality of cooling holes formed in a trailing edge part of the airfoil portion. The cooling holes communicating with the cooling passage and opening in a surface of the trailing edge part. A relation of d_up<d_mid<d_down is satisfied, where d_mid is an index indicating opening densities of the cooling holes in a center region including an intermediate position between a first end and a second end of the airfoil portion in the blade height direction, d_up is an index in a region positioned upstream of a flow of a cooling medium in the cooling passage from the center region in the blade height direction, and d_down is an index in a region positioned downstream of the flow of the cooling medium from the center region in the blade height direction.