METHOD FOR DETERMINATION OF SOLID ROCKET PROPELLANT SAMPLE COMBUSTION RATE Russian patent published in 2020 - IPC F02K9/96 

FIELD: measurement.

SUBSTANCE: invention relates to measurement of main intra-ballistic characteristics in a combustion chamber using current values of thickness of a roof of a burning specimen. Disclosed is a method of determining combustion rate of solid rocket propellant (SRP) sample. Method includes recording by a microwave sensor of time variation of a signal of low-frequency oscillations arising as a result of mixing on a detector-mixer of a reference microwave oscillation emitted by a generator, and microwave oscillation reflected by moving sample burning surface, signal recording in computer unit, wavelet filtration of signal, determination of combustion rate by calculation. Signal is filtered by complex wavelet transformation, separating the real and imaginary parts of the signal, and determining the phase of the signal as the arc tangent of the ratio of the imaginary part to the real one. Then scale of wavelet transformation is determined with jump of phase characteristic, by time of occurrence of which the moment of beginning of combustion process is determined and speed is calculated starting from specified moment.

EFFECT: method provides further increase in the SRP sample burning speed determination accuracy by expanding the controlled combustion time range by signal extraction at the beginning of the combustion process.

1 cl, 2 dwg, 1 ex