摘要
振荡水翼式潮流能采集系统一般通过二维水翼水动力学模型建立其关于俯仰与升沉方向两自由度的运动方程。但水翼三维模型与二维模型在诱导阻力计算上有着一定的差别,而诱导阻力又直接影响到系统的能量转化效率,因此有必要对振荡水翼三维的水动力学特性进行研究。本文根据叶素理论,以梯形翼作为三维水翼模型的代表,建立了梯形振荡翼的水动力学模型和运动方程。对该模型采用三维非结构网格和动网格技术进行数值模拟,着重探讨梯形比对其运动状态和能量转化效率的影响。结果表明:采用动网格模拟三维梯形振荡水翼的水动力学特性,得到的水翼运动状态与二维的相同;振荡水翼的诱导阻力会改变其稳定振荡频率和升沉运动幅值,直接影响了系统的能量采集效率;随着梯形比的降低,系统的能量转化效率先上升后降低,在梯形比为0.5时最大。本文的研究成果将有助于完善振荡水翼的结构设计方法。
The oscillating hydrofoil of tide energy collection system establishes the movement equation which includes the pitch and the heave. However,the difference of induced drag between the 3D model and 2D model influences the energy conversion efficiency of system directly. Therefore,the paper establishes the 3D trapezoid hydrofoil hydrodynamic model based on the blade element theory. The simulation of the model takes the 3D unstructured gird and dynamic mesh technique,focuses on the effect of trapezoid ratio to the movement and energy conversion efficiency. The results show： Adapting dynamic mesh to simulate the hydrodynamic characteristics of 3D trapezoid oscillating hydrofoil has acquired the same motion as 2D model; The induced drag of oscillating hydrofoil changes the stable oscillating frequency and pitching amplitude and influences the energy conversion efficiency of system; With the decrease of trapezoid ratio,the energy conversion efficiency of oscillating hydrofoil will increase at first and then decline,with the maximum value at point of 0. 5.Trapezoid foil design provides a feasible direction for the optimization of oscillating hydrofoil model.
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2015年第5期795-800,共6页
Journal of Shanghai Ocean University
基金
国家海洋局海洋能专项资金项目(SHME2013JS01)
国家自然科学基金项目(51309150)
上海市科技创新行动计划(14111103900)
上海市科技兴农重点攻关项目(沪农科攻字(2014)第4-4号)
关键词
振荡水翼
叶素理论
动网格
数值模拟
梯形比
oscillating hydrofoil
blade element theory
dynamic mesh
numerical simulation
trapezoid ratio
