Patent ID: 9068512
Filing Date: 2015-06-30
Classification: F02C,F05D,F23N,F23R

Abstract:
1. A method for protecting a gas turbine engine, the gas turbine having a compressor, a combustor, and a turbine, against high dynamical process values, including combustor/flame pulsations, the method comprising: a) measuring pulsations of the combustor with a sensor; b) dividing the frequency spectrum of the measured pulsation signal up into pre-defined band pass sections; c) computing the root mean square (rms) of the signal for each band; d) weighting the computed frequency/frequency band rms with predetermined weighting factors; e) cumulating the weighted frequency/frequency band rms values to get a Pulsation Limit Criterion (PLC) value; f) comparing the PLC value with at least one reference value; and g) operating the gas turbine engine according to the result of said comparing, wherein said weighting factors are predetermined based on a structural model for a complete structure of the combustor and other affected components, and by computing the stresses as a response to the acoustic load resulting from pulsations in the combustor.