Abstract Rotating detonation engine can be integrated with gas turbines to realize a high-performance power unit. We propose a novel method of non-intrusive vibration sensing for rotating detonation mode recognition. The conventional method is intrusive and exposes the pressure sensor to the high-temperature and high-pressure detonation wave, which limits the sensor life. In the proposed method, the vibration sensor is installed on the outer wall of the combustor, thus ensuring its safety and longevity. A comparison of the vibration sensing results at two installation sites shows that the vibration sensor must be installed on the propagation path of the detonation wave and downstream of the pre-detonator. In rotating detonation of hydrogen-air mixture, vibration sensing can recognize three rotating detonation modes, namely, stable, unstable, and failure. The frequency spectrum of vibration is consistent with that of pressure, and the discontinuities in the unstable case can be recognized in the time-frequency spectrum. The calculated phase difference between vibration and pressure agrees well with the actual installation angle. The phase space patterns and distributions of wavelet entropy are found to differ in the three rotating detonation modes. Vibration sensing is demonstrated to be a potential non-intrusive method for the mode recognition of a rotating detonation wave.

中文翻译：

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使用非侵入式振动传感进行旋转爆震模式识别

摘要 旋转爆震发动机可与燃气轮机集成，实现高性能动力装置。我们提出了一种用于旋转爆震模式识别的非侵入式振动传感的新方法。传统的方法是侵入性的，将压力传感器暴露在高温高压爆震波中，限制了传感器的使用寿命。在所提出的方法中，振动传感器安装在燃烧器的外壁上，从而确保了其安全性和使用寿命。两个安装地点的振动传感结果的比较表明，振动传感器必须安装在爆震波的传播路径上和预雷管的下游。在氢气-空气混合物的旋转爆震中，振动传感可以识别三种旋转爆震模式，即稳定、不稳定、和失败。振动的频谱与压力的频谱一致，在不稳定情况下的不连续性可以在时频谱中识别出来。计算出的振动和压力之间的相位差与实际安装角度非常吻合。发现小波熵的相空间模式和分布在三种旋转爆震模式中不同。振动传感被证明是一种潜在的非侵入式旋转爆震波模式识别方法。发现小波熵的相空间模式和分布在三种旋转爆震模式中不同。振动传感被证明是一种潜在的非侵入式旋转爆震波模式识别方法。发现小波熵的相空间模式和分布在三种旋转爆震模式中不同。振动传感被证明是一种潜在的非侵入式旋转爆震波模式识别方法。