On-line Monitoring of the Carbon Deposition in Combustion Chamber of a Turbojet Engine

摘要

The paper presents the application of the gas path electrostatic monitoring technology for monitoring of carbon deposition in combustion chamber of a turbojet engine. In order to obtain the accurate charge signal, the Least Mean Square (LMS) fitting method is adopted in electrostatic monitoring signal calculus. By the comparison of the data from the 101st and 130th stage, we observer the active level of the signal from the 130th stage is significantly higher than that from the 101st stage, but no evident difference can be detected in the positive (negative) event rate. The change in the active level of the signal can be contributed to the carbon depositions in combustion chamber found in the disassembly of the engine after the 130th stage test. So, we can conclude that the electrostatic monitoring system can detect the carbon depositions in the combustion chamber of a turbojet engine.