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Problem: In the studied Rolls-Royce RB211 gas turbine, we found damaged splitter nozzles in gas turbine combustor leading to hard to start problem, long waiting time and loss of our production and company revenues. However, it was not possible to perform the real-time inspection of the spittle nozzles located inside the combustor during operation.
Solution: We analysed the current condition of splitter nozzles by determining the exhaust temperature behind the combustor. The exhaust temperature profiles were collected using the thermocouples which were already installed to provide a feedback for fuel control unit. Our method combined a PCA modelling technique with the Rolls-Royce RB211 DLE Exhaust Temperature Mapping to detect and isolate the location of cracked splitter nozzles.
Benefit: We crossed check with the inspection report. After performing the start-up period, we found that our solution gave a consistent results as the report. However, unlike the currently used start-up examination technique, our method can capture genuine anomalies in real time.
P. Chinakay and S. Wongsa, A PCA-based fault monitoring of splitter nozzles in gas Turbine combustion chamber using exhaust gas temperature, In Proceedings of 2016 International Conference on Instrumentation, Control and Automation (ICA), pages 120-125, 29 - 31 Aug, 2016.
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