The aerodynamic flow resulting from engine combustion flow is researched.

Considering the combustion process as a dynamic excitation, we measure the noise and the vibration on chosen points on the burned-gases flow. By doing that we come to conclusions concerning the combustion flow and the after-burning.

In this experimental work appear the spectra of the noise measurements in connection with the R.P.M. of the engine. It is tried to find the function of air compressible flow concerned with mechanical situation and combustion flow of the engine.

The comparison between the spectra give us important information about the interdependance between the noise and the combustion flow in the combustion chamber and the after burner. The measurements take place on several situation engine.

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