空化湍流中柔性水翼的流致振动
Flow-Induced Vibration of Flexible Hydrofoil Within Cavitating Turbulent Flow
AI总结：
本研究采用LES、均相混合空化模型与结构模态叠加法，探究悬臂柔性水翼在三维流场中的流致振动与空化动力学，揭示了空化与结构振动共同主导螺旋桨鸣音噪声的机制。
摘要：
采用大涡模拟（LES）模型、均相混合空化模型和结构模态叠加法，研究了三维流场绕悬臂柔性水翼的流致振动与空化动力学。本研究旨在探索螺旋桨鸣音行为的潜在机制，因此重点关注流场内压力脉动、空化生成与结构振动之间的同步水弹性耦合。首先，我们将柔性水翼的叶梢涡动力学与现有实验结果进行了验证。结果表明，叶梢涡脱落与叶片振动导致了噪声源低频音调分量的强烈峰值，而后缘涡脱落则引起宽带分量。此外，片状空化的生成引发了显著的同步水翼振动（表现为类颤振响应），并影响流场中的压力脉动，进而主导水下噪声源的特征。研究认为，空化行为与结构振动共同主导了螺旋桨叶片鸣音噪声的特性。
英文摘要：
The flow-induced vibration and cavitation dynamics of three-dimensional flow past a cantilever flexible hydrofoil are investigated using a large eddy simulation (LES) model, a homogeneous mixture cavitation model and the structural modes superposition method. The present work aims to explore a potential mechanism responsible for a propeller singing behavior, and thus focuses on the synchronized hydroelastic coupling among the pressure pulsation inside the flow field, the cavitation generation and the structural vibration. To begin, we validate the tip vortex dynamics of a flexible hydrofoil against the available experimental. Our results demonstrate that the tip vortex shedding and the blade vibration are responsible for the intense peak in the low-frequency tonal components of the noise source, and the trailing-edge vortex shedding induces broadband components. Additionally, the generation of sheet cavitation induces considerable synchronized hydrofoil vibration (subjected to a flutter-like response), and affects the pressure fluctuations in the flow field, which further dominate the features of the underwater noise sources. It is suggested that the cavitation behavior and structural vibrations co-dominate the characteristics of singing noise from a propeller blade.
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