Rotary detonation engine detonation process online detection method based on rolling frequency measurement

The invention provides a rotary detonation engine detonation process online detection method based on rolling frequency measurement. The detonation of a rotary detonation engine has uncertainty, irregularity and transitivity, and the efficiency and reliability of a control system are seriously influenced because the detonation state cannot be accurately and quickly judged. According to the method, irregular high-frequency pressure signals generated by circumferential movement of a detonation wave head are conditioned into regular square wave signals through an analog circuit, the number of pulses in a fixed time window is collected in a rolling mode in combination with a software program, and the rotation frequency of the detonation wave head in the current time window is calculated through a frequency measurement method. And judging whether the detonation process is completed or not according to comparison between the frequency measured in a plurality of continuous time windows and a set threshold value. Acc