In order to study the detonation stability of continuous rotating detonation engine, anexperimental study was carried out on three annular slots of different area ratios, usinghydrogen as fuel and air as oxidant. Based on the high frequency pressure signal, theinfluence of the annular slot area ratio on the detonation parameter stability was analyzed.The experimental results show that when the area ratio is 0.08, the detonation wavepropagates in a double-wave colliding mode, and the peak pressure is in the range of0.3-0.9MPa. When the area ratio is 0.16, the detonation wave propagates in single wavemode, and the pressure peak is around 2.0MPa. When the area ratio is 0.32, the detonationwave propagates in a single-wave/double-wave coexistence mode, and the peak pressurefluctuation ranges from 0.4 to 3.0 MPa. When the area ratio is 0.08, the detonation waveself-sustaining propagation stability is strong, but the detonation wave stability is weakwhen the area ratio is too large or too small. Therefore, the area ratio of the annular slot hasa great influence on the mixing effect of hydrogen and air, which consequently impacts thedetonation stability of the continuous rotating detonation engine.
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