Abstract In this study, a non-invasive and environment-friendly acoustic emission (AE) technique, coupled with multiple analysis methods, was proposed to monitor the critical variation of separation efficiency of a cyclone separator by means of the gas-solid hydrodynamics. Acoustic energy analysis was used to reflect the characteristics of particle motion and particle-wall interaction. Shannon entropy analysis was adopted to reflect chaos and complexity of gas-solid two-phase motion. Multi-scale analysis (Hurst analysis and wavelet analysis) was used to obtain multi-scale characteristics inside the cyclone separator. To be specific, micro-scale collision behaviors of particle-particle and particle-wall, meso-scale interaction behavior between particle clusters and gas phase, and macro-scale interaction behavior (overall flow behavior). Furthermore, by comparison with the results of separation efficiency and pressure drop, the above-mentioned three methods based on AE technique can effectively reflect the critical variation of separation efficiency for cyclone separator.

中文翻译：

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多分析方法声发射技术监测旋风分离器分离效率的流体动力学及临界变化

摘要 在本研究中，提出了一种无创、环保的声发射（AE）技术，结合多种分析方法，通过气固流体动力学监测旋风分离器分离效率的临界变化。声能分析用于反映粒子运动和粒子-壁相互作用的特征。采用香农熵分析来反映气固两相运动的混沌和复杂性。多尺度分析（Hurst 分析和小波分析）用于获得旋风分离器内部的多尺度特征。具体而言，粒子-粒子和粒子-壁的微观尺度碰撞行为，粒子簇与气相之间的中尺度相互作用行为，以及宏观尺度相互作用行为（整体流动行为）。此外，