Gas Turbine Heat Shield Particulate Mitigation Device
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Solution Overview
Problem
Particulates in the cooling air of gas turbine engine components, such as dust, ice, ash, and dirt, accumulate on heat shields, reducing their cooling efficiency and durability due to excess temperatures and thermal stresses.
Innovation Solution
A particulate mitigation device is integrated into the gas turbine engine components, featuring a tubular body or fairing with a fluid passageway that directs airflow above the boundary layer to reduce particulate ingestion, thereby maintaining cooling efficiency and extending the lifespan of heat shields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is directed through cooling channels to cool heat shields, then cooling efficiency is improved, but particulate accumulation on the heat shield surface increases
Solution Approach 1:
A particulate mitigation device is introduced as an intermediary component between the cooling air source and the heat shield surface. This device modifies the cooling airflow to reduce particulate accumulation while maintaining cooling effectiveness, acting as a mediator that resolves the conflict between cooling and contamination.
Solution Approach 2:
The invention changes parameters of the cooling airflow, specifically directing it above the boundary layer to reduce particulate ingestion. By modifying flow parameters (velocity, direction, position relative to surface), the system achieves both cooling and particulate mitigation.
2Strength
If cooling structures are designed to protect against high heat loads, then thermal protection is improved, but the structures become more complex
Solution Approach 1:
The cooling system is segmented into distinct functional zones: cooling channels within the heat shield structure, boundary layer regions, and particulate mitigation devices. This segmentation allows each component to be optimized independently for its specific function while contributing to overall thermal protection.
3Temperature
If cooling airflow is directed closer to the heat shield surface, then cooling efficiency is improved, but particulate ingestion increases
Solution Approach 1:
The invention addresses the trade-off by utilizing the vertical dimension above the heat shield surface. By directing cooling airflow above the boundary layer rather than directly at the surface, the system accesses an additional spatial dimension that provides both cooling effectiveness and particulate mitigation.
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
The solution effectively captures airflow above the boundary layer, reducing particulate accumulation on heat shields and enhancing cooling efficiency by directing airflow closer to the heat shield surface, thus minimizing thermal stress and maintaining the durability of engine components.
Implementation Method 1
a cooling channel therebetween in fluid communication with the cooling hole for cooling the second surface of the second component
Implementation Method 2
the first selected distance is greater than or equal to a boundary layer of the second surface
Data Source
AI summary
A gas turbine engine component assembly is provided. The gas turbine engine comprises: a first component having a first surface and a second surface opposite the first surface; a second component having a first surface and a second surface, the first surface of the first component and the second surface of the second component defining cooling channel therebetween in fluid communication with the cooling hole for cooling the second surface of the second component; and a particulate mitigation device extending from the first surface of the second component a selected distance wherein the particulate mitigation device has an opening therethrough in fluid connection with the cooling channel, and wherein the selected distance is selected to reduce the amount of particulate entering the cooling channel.