Metallic Test Sample for Gas Turbine Corrosion Monitoring
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Solution Overview
Problem
Gas turbine engine components, particularly those made of nickel alloys and steel, suffer from corrosion issues such as hot corrosion and sulphidation, which are difficult to assess effectively during service, leading to reduced component lifespan and potential engine failures.
Innovation Solution
Incorporating metallic test samples made of the same or similar metals as the engine components, these samples are exposed to the same corrosive environments within the engine, allowing for the determination of corrosion levels and predicting the service life by comparing the corrosion data with a database of exposure time, temperature, and salt level correlations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If components are assessed for corrosion only during service centre examinations, then the assessment process is simple, but the component lifespan is reduced and engine failures may occur due to inability to detect corrosion in real-time
Solution Approach 1:
Metallic test samples are installed in the engine before operation to proactively monitor corrosion conditions. The test samples are positioned to expose them to the same corrosive environments as the actual components, enabling early detection of corrosion issues before they affect the main components.
Solution Approach 2:
Test samples made of the same or similar metals as the actual components are used as substitutes to replicate the corrosion experience. These copies undergo the same corrosive conditions in the engine environment, allowing indirect assessment of component corrosion without disassembling or inspecting the actual expensive components.
2Reliability
If metallic test samples are installed to monitor corrosion in real-time, then component lifespan and reliability are improved, but the device complexity and installation requirements increase
Solution Approach 1:
The corrosion monitoring function is segmented from the main engine components and implemented through separate, dedicated test samples. This allows the monitoring system to be independently installed, maintained, and removed without affecting the primary engine components.
Solution Approach 2:
The test samples are designed as inexpensive, consumable items that can be easily replaced. They serve their purpose of monitoring corrosion conditions and then can be removed and analyzed without being part of the permanent engine structure, reducing the overall complexity of the monitoring system.
3Object-affected harmful factors
If components are made of nickel alloys to resist corrosion, then corrosion resistance is improved, but the components still suffer from hot corrosion and sulphidation reducing their service life
Solution Approach 1:
The corrosive environment that harms the components is converted into a beneficial monitoring opportunity. By placing test samples in the same corrosive environment, the harmful corrosive gases and conditions are used to accelerate corrosion on the test samples, which then serve as indicators of the actual corrosion rate on the main components.
Data Source
AI summary
A method of determining the service life of a gas turbine engine component comprises providing, within a gas turbine engine, a component having an air washed surface, the component comprises a metal, wherein the air washed surface receives a supply of cooling air from a chamber within the gas turbine engine. The method also comprises mounting a metallic test sample within the chamber so as to be located in the supply of air which is delivered to the air washed surface. The metallic test sample is constructed of the same metal as the component. The method further comprises removing the metallic test sample and determining the degree of corrosion of the metallic test sample.