Gas-structure coupling vibration is one kind of vibration caused by air pulsation. This coupling vibration causes widespread damage and deformation of three-stage cyclone separator used in Residue Fluid Catalytic Cracking (RFCC). After theoretically analyzing the mechanism of the generation of the gas-structure coupling vibration, the numerical simulation of three-dimensional swirling flow the cyclone separator was performed by using Reynolds Stress Model (RSM). The results showed the existence of processing vortex core (PVC) in the cyclone separator. The PVC phenomenon and motion of PVC were described in detail. Furthermore, the amplitude and frequency of gas fluctuation in the PVC region at different axial positions were quantitatively analyzed. The simulation results agreed with the experimental results of Laser Doppler Velocimetry (LDV). Finally, considering the characteristics of transient torsional pendulum of PVC in cyclone separator, the fluid-solid coupling dynamic characteristics of three-stage cyclone separator were analyzed by the finite element method, which provides references for the structure optimization design of new type cyclone separator.

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