Influence of aluminum dispersion on acoustic admittance of the solid propellant combustion surface

The article presents results of experimental determination of the acoustic conductivity of the combustion surface of a solid propellant modified with additives of aluminum powder of various dispersion. The experiments were conducted in a specially designed double-ended T-shaped combustion chamber the design of which allowed its length to be varied. The T-shaped chamber allows for the generation of acoustic waves during combustion of solid propellant charges. During the experiment, high-frequency pressure pulsations in the combustion chamber were recorded using a highly sensitive piezoelectric sensor located on its body. The obtained data were processed using spectral analysis, which made it possible to determine the frequency of the resulting acoustic oscillations and their amplitude. The obtained data allow calculating the acoustic conductivity of the burning surface of solid propellant depending on the frequency and amplitude of oscillations in the combustion chamber. Acoustic conductivity characterizes the ability of the surface to amplify sound waves and is an important parameter for modeling combustion processes and assessing the stability of solid-propellant rocket engines. The obtained results can serve as a basis for verification of the developed mathematical models of the combustion process of solid propellants with additions of aluminum powder.

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