Abstract:

In order to effectively warn of the compressor surge fault of an MTE, the relevant engine parameters corresponding to the surge fault were determined by fault injection in the engine simulation model. Sensors corresponding to the monitoring parameters were installed in the MTE bench test, and data were collected and transmitted through the acquisition card. Multiple test runs were conducted. Then six characteristic speed points were selected in the speed range of 0-140 000 r/min, and the simulation model and MTE test run data were combined to calculate the fault threshold of the parameters at the characteristic speed points. Finally, an early warning program for the surge fault based on LabVIEW was designed, and the feasibility of the early warning program was verified by designing a surge fault test on the MTE test bench. The results show that the two parameters most affected by the compressor surge fault are the outlet pressure of the compressor and the outlet temperature of the combustion chamber. When MTE surges, the outlet pressure of the compressor drops, and the outlet temperature of the combustion chamber rises sharply. The early warning program can not only monitor the parameter changes in real time and issue an alarm but also stop the engine in time to ensure the safety of the test personnel.

Key words: micro-turbojet engine (MTE), compressor surge, early warning of fault, fault injection, LabVIEW