平坦和波浪形地面附近俯仰翼型自推进运动的对比分析
Comparative Analysis of the Self-Propelled Locomotion of a Pitching Airfoil near the Flat and Wavy Ground.
作者信息
Xin Zhiqiang, Cai Zhiming, Ren Yiming, Liu Huachen
机构信息
The College of Mechanics and Materials, HoHai University, Nanjing 211100, China.
出版信息
Biomimetics (Basel). 2022 Dec 12;7(4):239. doi: 10.3390/biomimetics7040239.
In this paper, a pitching airfoil near flat and wavy ground is studied by numerical simulations. The kinematic features of the airfoil and the flow field around it are analyzed to reveal unsteady vorticity dynamics of the self-propelled airfoil in ground effect. The optimal pitching periods at different initial heights above flat ground are obtained, which make the pitching airfoil achieve the maximum lift-to-drag ratio. Compared with flat ground, at the same initial height, the optimal pitching periods vary with the shape of ground. The structure and the strength of the wake vortices shedding from the airfoil are adjusted by the wavelength of ground. This leads to the changes of amplitude and occurrence times of the peak and valley of lift and drag force. The results obtained in this study can provide some inspiration for the design of underwater vehicles in the ground effect.
本文通过数值模拟研究了靠近平坦和波浪形地面的俯仰翼型。分析了翼型及其周围流场的运动学特征，以揭示地面效应下自推进翼型的非定常涡度动力学。获得了在平坦地面上方不同初始高度处的最佳俯仰周期，使俯仰翼型实现最大升阻比。与平坦地面相比，在相同初始高度下，最佳俯仰周期随地面形状而变化。地面的波长调节了从翼型脱落的尾流涡旋的结构和强度。这导致升力和阻力峰值和谷值的幅度和出现时间发生变化。本研究所得结果可为地面效应下的水下航行器设计提供一些启示。
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