Gas Turbine Impingement Cooling Dust Pocket Design
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Solution Overview
Problem
Gas turbine engines face issues with particulate accumulation in cooling passages, leading to blockages and reduced efficiency, as environmental and domestic particulates enter the engine and deposit on hot section components, causing distress and early removal of the engine.
Innovation Solution
A dual wall component system with impingement cooling holes and pockets on the second wall, where the pockets are designed to redirect air and particulates into the cooling passage, minimizing accumulation and preventing blockages by promoting particulate accumulation within the pockets rather than the passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling passages are used in hot section components, then cooling efficiency is improved, but particulate accumulation leads to blockages and reduced reliability
Solution Approach 1:
The cooling passage is segmented into multiple sections by introducing transverse ribs that create distinct flow zones. This segmentation prevents continuous particulate accumulation along the passage length and facilitates periodic clearing of deposits through flow separation at each rib interface
Solution Approach 2:
The transverse ribs create periodic flow disturbances and separation zones that continuously disrupt particulate deposition patterns. This periodic action prevents steady-state accumulation and promotes periodic clearing of particles from the cooling passage surfaces
2Temperature
If impingement cooling holes are used to cool the component, then cooling performance is improved, but particulates enter the cooling passage and accumulate
Solution Approach 1:
Transverse ribs are introduced as intermediary structures within the cooling passage that intercept particulates before they can travel far along the passage. These ribs act as physical barriers and flow directors that mediate between the impingement cooling holes and the downstream cooling surfaces
Solution Approach 2:
The transverse ribs convert the harmful effect of particulate-laden cooling flow into a beneficial flow separation pattern. The ribs cause the cooling fluid to separate and reattach, creating low-pressure zones that draw particles away from critical surfaces and promote their removal through the cooling system
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 extends the life of hot section components by maintaining a continuous flow and reducing particulate buildup in the cooling passage, thereby enhancing engine efficiency and reducing maintenance costs.
Implementation Method 1
each of the pockets is configured to receive a cooling fluid from the respective one of the impingement cooling holes and direct the cooling fluid into the cooling passage
Implementation Method 2
the first wall and the second wall together define a cooling passage between the first wall and the second wall
Data Source
AI summary
A system may be provided that includes a hot section component of a gas turbine engine. The hot section component includes a dual wall, which includes a first wall and a second wall. The first wall includes multiple impingement cooling holes extending through the first wall. The second wall is positioned adjacent the first wall. The first wall and the second wall together define a cooling passage between the first wall and the second wall. Multiple pockets are in a surface of the second wall. Each of the pockets is positioned opposite a respective one of the impingement cooling holes. Each of the pockets is configured to receive a cooling fluid from the respective one of the impingement cooling holes and direct the cooling fluid into the cooling passage. The cooling passage includes a single cooling passage into which the pockets are configured to direct the cooling fluid.