Aerospace Technic and Technology

The subject of research in this article is the process of turning on the afterburner combustion chamber of a modern turbojet bypass engine. The parameters of switching in the afterburner were studied: pressure pulsations of the gas flow between the high- and low-pressure turbines, causing vibrations, parameters, and characteristics of the process of ignition of the fuel-air mixture in the afterburner. The goal is to establish the possibility of evaluating the inclusion of an afterburner in terms of vibration parameters as effective controlled parameters and determine rational ranges for their measurement. Tasks: the study of the function of the correlation coefficient in the spectral region and the deviation of the maximum amplitude of the power spectral density in different frequency ranges. The methods used are an experimental method for measuring vibration parameters, methods of spectral analysis, and mathematical statistics. The following results were obtained: the prospects for using the method for measuring the parameters of the casing vibration to assess the effectiveness of identifying the start of operation of the afterburner combustion chambers of the gas turbine engine were studied. The functions of the correlation coefficient in the spectral region and the deviation of the amplitude peaks of the power spectral density in different frequency ranges are studied. The optimal frequency ranges and the signal level of the deviation of the amplitude peaks of the power spectral density were established to identify the start of operation of the afterburner combustion chambers of the gas turbine engine by vibration parameters. The prospects for further research in the field of vibration diagnostics of combustion chambers are shown. Conclusions: the scientific novelty of the results obtained is as follows: it has been established that the signal of the vibration sensor in the spectral region reliably reflects the pressure pulsation of the gas flow in the afterburner. Thus, it can be used to adequately represent the process of pressure change in the engine flow path. Identification of the start of operation of the afterburner must be carried out by analyzing the deviation of the power spectral density amplitude maxima or analyzing the deviation of the power spectral density amplitude maxima at certain frequencies and levels.

gas turbine engine; afterburner; vibration process parameters

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