不同干扰下串列双PTC圆柱的振动及功率稳定性研究

The development of ocean energy aligns with the national dual-carbon strategy objectives. The large-scale utilization of VIVACE devices to extract ocean current energy requires the coordinated power generation of multiple oscillators. However, the perturbation effects among multiple oscillators can create a relatively chaotic flow field, resulting in unstable vibration responses of the VIVACE device. To address this issue, a rigid connecting structure was proposed to mitigate the perturbation caused by flow-induced vibrations. With the RANS method and the Spalart-Allmaras turbulence model, combined with the dynamic meshing and the UDF technology, the flow-induced vibration responses, vibration stability, and instantaneous output power stability of separated serial twin PTC cylinders and rigidly connected twin PTC cylinders were simulated under 3 spacing ratios: L=1.5D, L=2.5D, and L=3.5D. The results indicate that, in the rigidly connected case, the vibration amplitude stability will decrease with the spacing ratio. Compared to the separated configuration, the rigidly connected setup has higher vibration stability and instantaneous output power stability as well under all 3 spacing ratios, although the improvement effect diminishes as the spacing ratio increases. A net damping coefficient was introduced to assess the energy changes in the system during the vibration process of the separated serial twin PTC cylinders and the rigidly connected serial twin PTC cylinders. The results show that, an unstable net damping coefficient leads to unstable energy in the system, ultimately resulting in unstable vibration responses.