Autocorrelation theory-based engine instability prediction and assessment method
An engine and autocorrelation technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of inability to evaluate engine instability in real time, high time and capital costs, and inability to monitor engines in real time
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[0054] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.
[0055] Before introducing the present invention in detail, a brief description of the autocorrelation theory is given.
[0056] Autocorrelation reflects the degree of correlation of the same signal at different times, and the degree of correlation gradually decays with time. The inherent noise in the combustion chamber of the liquid rocket engine continuously excites the pressure pulsation. Due to the dissipation effect of the combustion chamber, the amplitude of the pressure pulsation excited at a certain moment gradually decays with time. The pressure amplitude decay rate is characterized by the correlation degree decay rate.
[0057] Taking the high-frequency unstable combustion of a model engine as an example, the calculation process of the method of the present invention is specifically described. The structure of the...
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