Technique for recording and analysis of the amplitude spectrum of the strength oscillations of magnetic and electric fields of combustion products in a model liquid rocket engine fuel depending on the combustion chamber pressure

The technique and results of the correlational and spectral analyses of the electrophysical characteristics of the combustion products of oxygen- and kerosene-based fuel, recorded with noncontact primary-measuring electromagnetic transducers during the firing tests of a model liquid rocket engine, are presented. A technique is developed for secondary processing sets of electromagnetic field parameters for the correlational and spectral analyses of a duty parameter $($combustion chamber pressure$)$ and a parameter to be determined $($strength of the electromagnetic field of the combustion products$)$ in the $0$–$28$ kHz range. The maximums of the amplitude spectrum of signals from the magnetic and electric field sensors at frequencies of $114$ and $49$ Hz, respectively, are determined, and a near-linear $($with the correlation coefficient of $0.863)$ dependence of the amplitude of the strength oscillations of the magnetic field of the combustion products on the combustion-chamber pressure in the model liquid-fuel rocket engine, which can be used for the diagnostics of the working process parameters in the chamber of a liquid rocket engine, is derived.