Acoustic and electrophysical diagnostics of two-phase high-enthalpy flow: Results of experimental investigations

On an experimental setup consisting of a model liquid-propellant rocket engine operating on gaseous oxygen–kerosene fuel components, the electrophysical and acoustic characteristics of a high-enthalpy two-phase flow are studied at temperatures in the combustion chamber of $3550$–$2900$ K with solid particles entering the flow as a result of the erosion of the carbon plastic nozzle cross section insert. The gas flow velocity at the cut corresponds to a Mach number of $2.2$–$1$. The electrophysical and acoustic parameters of a two-phase high-enthalpy flow and the vibrational characteristics of the design of a model liquid-propellant rocket engine are recorded. Using an electric field sensor, it is found that carbon particles create an excess negative electric charge in the jet. When analyzing the amplitude spectra of the acoustic field of the outflowing jet and vibrations of the structure, frequencies in the range $1200$–$1800$ Hz that characterize the working process in the combustion chamber of a model liquid rocket engine are determined.