Algorithm and program complex for analysis of the characteristics of acoustic waves of plasma actuator flush-mounted in the model plane nozzle

Currently, the problem of developing new technologies of reducing the noise of aircraft engines, including directional impact on the noise on the basis of interaction between plasma disturbances and acoustic waves, stands acutely. One of the devices built on this principle is being developed in GPI RAS. These devices are plasma actuators (group of related to each other discharge gaps built on the perimeter of the nozzle) of various shapes and forms. The aim of this study was to perform a comparative analysis of spectra of acoustic waves produced as a result of work of a plasma actuator for air flowing out of the nozzle. The research was carried out for actuators of various designs and different shapes of nozzles. The following tasks have been solved: sorting and analysis of experimental data; development of the algorithm and creation of the program for studying spectral and correlation characteristics of acoustic signals; evaluation of spectral and correlation characteristics of acoustic signals in experiments with two types of actuators (with and without gas flow); comparative analysis of correlation and spectral characteristics of acoustic signals received at the outlet of the nozzle when an air flow interacts with plasma actuators of various configurations. With the help of the software program complex created in the MatLab environment, spectral and correlation characteristics of acoustic signals were investigated which allowed to construct the physical model of a plasma actuator in a plane nozzle. With the help of the developed research methodologies, the promising effect of using plasma actuators influence on air flow through the nozzle was proved.