Method and apparatus to predict and / or prevent flame extinction by reducing supply of fuel in a gas turbine

摘要

A method for predicting extinction of flame by reducing fuel supply (LBO) in a turbine engine gas, said method comprising: extracting (116) a tone of LBO, a cold tone and a warm tone signals (102) pressure representative of pressure inside each of a plurality of chambers and monitored combustor determine RMS values ​​for each of said tones; subjecting monitoring (128) a frequency of a hot tone in each chamber monitored using a function of cumulative probability density of a normal distribution and a mean and selected to achieve a desired probability of LBO for a value variance RMS given tone LBO; use the extracted tones and the frequency Tracked to determine (124) a probability of an LBO; and characterized by refining the determined probability of an LBO RMS using a ratio (α) reflecting the relative change in the LBO tone, the cool tone and the warm tone and the frequency offset (β) of the warm tone.