水翼尾缘摆动建模与流体动力特性研究

Modeling and Hydrodynamic Characteristics of Flapping Hydrofoil Trailing Edge

摘要: 摆动状态下的水翼广泛应用于直翼推进器、波浪能捕获和仿生推进等领域，其流体动力特性是装置设计过程中必须考虑的因素之一。本文对不同水翼摆角和不同来流速度下的水翼尾缘摆动的水动力特性进行仿真分析。首先建立了NACA0012经典翼型作为分析对象，随后采用多面体网格结合重叠网格技术得到了摆动水翼的流体动力学计算方法。在此基础上，对水翼尾缘在±20˚的摆动角度范围和1~10 m/s来流流速范围内的水动力特性进行了仿真分析。结果显示，随着摆动角度的增大，最大压力变化较小，最低压力逐渐增大，升力和阻力均增加，升力增加的速度逐渐减小，阻力增加的速度逐渐增大。随着来流速度的增大，最大压力和最小压力均有不同程度的增加，升力和阻力增大。

Abstract: The hydrofoil in the swinging state is widely used in the fields of propeller, wave energy capture and bionic propulsion, and its hydrodynamic characteristic is one of the factors that must be considered in the design of the device. In this paper, the hydrodynamic characteristics of the flapping hydrofoil under different swing angles and different incoming flow speeds are simulated and analyzed. First, the NACA0012 airfoil is established as the analysis object, and then the hydrodynamic calculation method of the flapping hydrofoil is obtained by using the polyhedral grid and the dynamic grid technology. On this basis, the hydrodynamic characteristics of the hydrofoil in the swing angle range of ±20˚ and the flow velocity range of 1~10 m/s are simulated and analyzed. The results show that as the swing angle increases, the maximum pressure changes less, the minimum pressure gradually increases, both lift and resistance increase, the speed of lift increase gradually decreases, and the speed of resistance increase gradually increases. With the increase of the incoming flow velocity, the maximum pressure and the minimum pressure (negative pressure) both increase to varying degrees, the lift and resistance increase, and the increasing speed gradually increases.