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2025 , Vol. 30 >Issue 6: 1289 - 1298

DOI: https://doi.org/10.1007/s12204-023-2693-9

Transportation Systems

Vortex-Induced Vibration and Frequency Lock-In of an Elastically Suspended Hydrofoil with Blunt Trailing Edge

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  • 1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China

Received date: 2023-04-18

  Accepted date: 2023-07-21

  Online published: 2023-12-21

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Abstract

Vortex-induced vibration of hydrofoils is concerned with structural safety and noise level in hydraulic machinery and marine engineering. The research on vibration characteristics under different operating conditions is significant. In this study, numerical simulations are conducted to investigate the vortex-induced vibration responses of an elastically suspended hydrofoil with blunt trailing edge in pitch direction. The work studies the effects of four parameters, namely the structural natural frequency, mass ratio, initial attack angle, and Reynolds number on vibration characteristics, with special emphasis on frequency lock-in. Results indicate that as the structural natural frequency changes, the vibration amplitude may increase substantially within a certain frequency range, in which the vortex shedding frequency locks into the structural natural frequency, and frequency lock-in occurs. In addition, with increasing the mass ratio, the frequency range of lock-in becomes narrower, and both the upper and lower thresholds decrease. As the initial attack angle increases from 0◦ to 6◦, the lock-in range gets reduced. Over the three Reynolds numbers (6 × 105, 9 × 105, and 12 × 105), the lock-in range remains virtually unchanged. Moreover, for a certain structural natural frequency, modifying the mass ratio, initial attack angle, and Reynolds number could effectively suppress the vibration amplitude.

Cite this article

QIN Guangfei, ZHANG Huaixin, LI Date . Vortex-Induced Vibration and Frequency Lock-In of an Elastically Suspended Hydrofoil with Blunt Trailing Edge[J]. Journal of Shanghai Jiaotong University(Science), 2025 , 30(6) : 1289 -1298 . DOI: 10.1007/s12204-023-2693-9

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