DYNAMIC PRESSURE METHOD OF DETECTING FLAME ON/OFF IN GAS TURBINE COMBUSION CANS FOR ENGINE PROTECTION

摘要

The flame status of a group of gas turbine combustors is acoustically monitored using dynamic pressure sensors within the combustor. Dynamic pressure sensor output signals are received from the sensors and processed to determine flame status. The signals are processed both by performing a correlation analysis within each combustor and by applying a wavelet-based flame detection algorithm to each output signal. A flame is determined to be present based on the correlation analysis and the wavelet-based flame detection algorithm. The wavelet-based flame detection algorithm is chosen based on whether the gas turbine combustors are in an ignition phase or a monitoring phase.

主权项

1. A method for monitoring flame status in a plurality of combustors of a gas turbine engine, comprising:
receiving dynamic pressure sensor output signals from dynamic pressure sensors arranged in the combustors, the dynamic pressure sensor output signals being indicative of acoustic oscillations within the combustors; for each of the dynamic pressure sensor output signals, computing a preprocessed time-domain signal by digitizing and filtering the dynamic pressure sensor output signal; for each of the dynamic pressure sensor output signals, computing a preprocessed wavelet signal using a discrete wavelet transform; applying a wavelet-based flame detection algorithm to the preprocessed wavelet signals to determine a wavelet-based flame status for each of the dynamic pressure sensor output signals; for each combustor, performing a correlation analysis on one or more of the preprocessed time-domain signals to determine a correlation-based flame status; determining the flame status based on the correlation-based flame status and the wavelet-based flame statuses.