Gas Turbine Shingle Bolt Cooling via Base Body Cavity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing combustion chamber shingle arrangements in gas turbines face issues with material creepage and high temperatures at threaded bolts, leading to potential failure due to inadequate cooling, especially since the foot of the threaded bolt is not cooled effectively.
Innovation Solution
A combustion chamber shingle arrangement that includes a base body connecting the threaded bolt to the combustion chamber shaft, featuring a platform with a cavity between the platform and the shingle, and passage openings for cooling air to flow through, ensuring effective cooling of the threaded bolt and the shingle, made from a single material to eliminate welding compounds and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the threaded bolt is welded to the combustion chamber shingle, then the shingle can be securely fastened, but the base of the threaded bolt cannot be cooled and very high temperatures occur causing material creep
Solution Approach 1:
A base body is introduced as an intermediary component between the threaded bolt and the combustion chamber shingle. This base body includes a platform that receives the threaded bolt and a connection area that connects to the shingle, with a cavity between them. The base body acts as a thermal mediator that allows cooling air to flow through the cavity, preventing excessive temperature accumulation at the threaded bolt base while maintaining the mechanical fastening function.
Solution Approach 2:
The solution introduces a spatial dimension by creating a cavity between the platform and the combustion chamber shingle. This cavity provides a three-dimensional cooling path for air to flow around the base of the threaded bolt, transitioning from a two-dimensional surface cooling approach to a volumetric cooling approach that effectively removes heat from the threaded bolt base.
2Temperature
If effusion cooling holes are provided in the combustion chamber shingle, then cooling is achieved, but the area below the threaded bolt remains uncooled
Solution Approach 1:
The cooling system is segmented into multiple zones: effusion cooling holes in the combustion chamber shingle for general cooling, and a separate cavity cooling system below the platform for targeted cooling of the threaded bolt base. This segmentation allows each cooling mechanism to address specific thermal zones, ensuring complete cooling coverage without compromising the reliability of critical areas.
3Temperature
If a base body with cavity is introduced to cool the threaded bolt, then temperature is reduced, but device complexity increases
Solution Approach 1:
The base body combines multiple functions into a single component: it provides mechanical support for the threaded bolt, creates the cooling cavity, connects to the combustion chamber shingle, and facilitates cooling air flow. By merging these functions into one integrated base body rather than separate components, the design reduces overall system complexity while achieving effective cooling.
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 solution prevents material creepage and high temperature issues, achieving homogeneous temperature distribution, prolonging the life of the combustion chamber shingle arrangement and simplifying manufacturing and assembly while avoiding throttling of the cooling air stream.
Implementation Method 1
The numerous effusion cooling holes ensure that the temperature at the combustion chamber shingle does not become too high
Implementation Method 2
the cavity between the platform and the combustion chamber shingle is connected to a rear environment of the combustion chamber shingle by means of at least one, and preferably a plurality, of through-opening. This creates a cooling flow below the platform through the through-opening in the connection region to the at least one effusion cooling hole below the base body
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
The invention relates to a combustion chamber shingle arrangement of a gas turbine, comprising a combustion chamber shingle (2), at least one threaded bolt (3) provided for fastening the combustion chamber shingle (2), and a base body (4) which connects the threaded bolt (3) to the combustion chamber shingle (2), wherein the base body (4) comprises a platform (40) and a connection area (41) which connects the platform (40) to the combustion chamber shingle (2), wherein the threaded bolt (3) is arranged on the platform (40), and wherein a cavity (5) is formed between the platform (40) and the combustion chamber shingle (2).