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

doi:10.1007/s12204-023-2693-9

Abstract

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.

Key words: vortex-induced vibration, hydrofoil, blunt trailing edge, frequency lock-in, structural natural frequency, mass ratio, initial attack angle, Reynolds number

摘要： 水翼涡激振动关系到水力机械和海洋工程的结构安全与辐射噪声，因此开展不同工况下水翼振动特性研究具有重要的实际意义。基于数值模拟方法，计算了在俯仰方向上弹性支撑的钝尾缘水翼的涡激振动响应问题，探究了结构固有简约频率、质量比、初始攻角和雷诺数对振动特性的影响。结果表明，随着结构固有频率的变化，在特定的结构固有频率范围内发生了锁频现象。此外，随着质量比的增加，锁频范围减小。当初始攻角从0°增加到6°，锁频范围随之减小。三种雷诺数下(6×105, 9×105, 12×105)，锁频范围几乎保持不变。此外，对于给定的结构固有频率值，通过改变质量比、初始攻角以及雷诺数可以有效减小振幅。

关键词: 涡激振动，水翼，钝尾缘，锁频，结构固有频率，质量比，初始攻角，雷诺数

CLC Number:

U661

QIN Guangfei, ZHANG Huaixin, LI Date. Vortex-Induced Vibration and Frequency Lock-In of an Elastically Suspended Hydrofoil with Blunt Trailing Edge[J]. J Shanghai Jiaotong Univ Sci, 2025, 30(6): 1289-1298.

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