水下拍动翼塔筒尾涡能量捕获数值模拟研究

Numerical Study on Energy Capture from Tower Wake of Underwater Flapping Wings

摘要:

拍动翼型作为一种广泛应用于研究能量提取的流动机制的简化模型，该系统从潮流能中捕获能量并转换为电能输出，虽然拍动翼型在水下均匀流条件下的动态行为已有广泛研究，但在实践中可能会遇到包括非定常涡旋在内的复杂来流条件，因此需要针对 NACA0015 翼型在有圆柱尾流效应时进行深入研究。通过 CFD 技术，数值研究不同运动参数对其水动力特性及能量捕获效率，分析与探究水下拍动翼运动过程中的涡旋结构，以及俯仰振幅、升沉振幅对系统捕能效率的影响。研究结果表明：随着升沉振幅增大，能量捕获效率也会提高。此外，还发现圆柱尾涡对拍动翼水动力性能的影响随俯仰振幅的增大而减小。通过分析不同运动参数下拍动翼系统的水动力性能及能量捕获效率，提出了一种高效捕获海上风场潮流能的参考方案，不仅对提高海上风场效能具有重要意义，还对于消除潜在的塔筒涡激振动具有积极意义。

Abstract:

The flapping foil，as a simplified model for energy extraction study，converts tidal energy into electrical output. While its behavior under uniform flow is well-studied，complex flow conditions with unsteady vortices require further investigation of NACA0015 airfoil under cylinder wake effects. Using CFD simulations， hydrodynamic characteristics and energy harvesting efficiency under various motion parameters are studied. Furthermore，vortex structures and the effects of pitching and heaving amplitudes are analyzed. The results show that energy capture efficiency increases with heaving amplitude，while cylinder wake effects decrease with larger pitching amplitude. The analysis provides a reference scheme for efficient tidal energy collection in offshore wind farms， contributing to both improved efficiency and reduced tower vortex-induced vibrations.