METHOD TO DIAGNOSE DISPOSITION OF COMBUSTION CHAMBER TO BUZZ AND METHOD TO CONTROL GAS TURBINE Russian patent published in 2015 - IPC F23R3/00 F23N5/24 

FIELD: measurement equipment.

SUBSTANCE: method to diagnose disposition of the combustion chamber to buzz in working condition, including the following stages: operation of the combustion chamber in working condition; registration of thermosonic value of gas volume of the combustion chamber and/or value of oscillations of combustion chamber structure in working condition and determination of the parametric value by thermosonic value and/or value of oscillations; determination of the spectrum of the parametric value in the working condition in the form of its amplitude characteristic depending on time; identification of the first and second resonances of the parametric value with the help of the spectrum; determination of the amplitude value of the first resonance and amplitude value of the second resonance; calculation of the stability parameter as the function of the amplitude value of the first resonance and amplitude value of the second resonance; determination of the bottom and/or top value of the distance, for which the stability parameter is above the lower specified threshold and/or upper specified threshold value. Threshold values are chosen so that in case of operation of the combustion chamber in working condition with still permissible disposition to buzz the stability parameter in this working condition has one of threshold values. They determine quantification of disposition to buzz by means of the lower and/or upper distance value. At the same time the parametric value is sound pressure in the combustion chamber measured with the help of at least one microphone.

EFFECT: invention is aimed at creation of the diagnostics method, in which the combustion chamber may be operated with quite low disposition to buzz.

16 cl, 4 dwg