A Method for Determining the Location of Vibration Source in Gas Turbine Combustion Chamber

Abstract

A method for determining a combustor vibration source position of a combustion gas turbine comprises the following steps: mounting a plurality of channels of dynamic pressure sensors at a plurality of positions in a combustor; connecting the sensors with various data collecting channels of a collecting system; measuring dynamic pressure signals in a set time period by each sensor simultaneously, and simultaneously recording and storing the signals through the data collecting channels; performing fourier expansion on the signals in each channel, and decomposing into harmonic signals with various frequencies to add; taking the harmonic signal of one frequency contained in the signals measured by one sensor as a standard, carrying out correlation analysis to the harmonic signals of the same frequency contained in the signals measured by other sensors respectively, and then recording the corresponding moment that a peak appears firstly in each correlation function, wherein the moment is the time difference transmitted to the sensors from the vibration source point of the harmonic signal of the frequency; finally determining the vibration source points of the harmonic signals of the various frequencies according to the transmission principle of the wave, wherein the gathering point of the vibration source points is the position of the vibration source area in the combustor.

Description

technical field [0001] The invention belongs to the technical field of measurement and control of a combustion chamber of a gas turbine, and in particular relates to a method for determining the position of a vibration source of a combustion chamber of a gas turbine. Background technique [0002] As the world pays more attention to environmental protection issues, countries have stricter and stricter requirements on gas turbine combustor emissions, especially NOx. In order to reduce the emission of pollutants such as NOx, most modern gas turbine combustors adopt lean premixed combustion technology. Lean premixed combustion is likely to cause thermoacoustic oscillation in the combustion chamber. In addition to generating noise, thermoacoustic oscillation is also very harmful to the safe operation of gas turbine equipment. In addition, thermoacoustic oscillations in the combustion chamber often disturb the combustion process, which can lead to an increase in the emission of h...

AI Technical Summary

Problems solved by technology

However, these technologies did not start from the source of thermoacoustic oscillation in the combustion chamber to first determine the location of the vibration source, and then seek effective methods to control or suppress it

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