摘要
扑翼获能器是一种通过升沉俯仰运动从海流中提取能量的装置。采用计算流体力学(CFD)方法对钝尾缘扑翼获能特性进行数值模拟计算,探究钝尾缘对称加厚初始位置、钝尾缘对称加厚厚度与翼型厚度对钝尾缘扑翼获能特性的影响规律。结果表明,钝尾缘对称加厚初始位置与翼型弦长之比p/c=0.90时,钝尾缘控制策略的获能效果较明显。钝尾缘对称加厚厚度对扑翼获能特性的影响主要体现在中高缩减频率,总体来看扑翼获能效率随钝尾缘对称加厚厚度增大呈现先增大后减小的趋势,当钝尾缘对称加厚厚度与翼型弦长之比l/c=0.02时,钝尾缘扑翼获能效率的提升效果达到阈值。随着翼型厚度逐渐增大,钝尾缘扑翼的获能效率先增大后减小,并且当翼型为NACA0030时,获能效率达到峰值。
The flapping airfoil energy harvester is a device that extracts energy from ocean currents through the heave and pitch motions.The numerical simulation of the energy harvesting characteristics of flapping wing with blunt trailing edge is carried out by means of computational fluid dynamics(CFD).Influences of the initial position to symmetrically thicken the trailing edge,thickness of the blunt trailing edge and the airfoil thickness on the energy harvesting efficiency of the flapping airfoil were systemically investigated.The results show that there is an optimal ratio of the initial position to symmetrically thicken the trailing edge to the chord length of the airfoil p/c=0.90,at which the largest increase in the efficiency of the flapping airfoil can be achieved.It is also found that the influence of the blunt trailing edge thickness on the performance of a flapping airfoil is more significant in the range of the middle and high reduction frequency.In general,the energy harvesting efficiency of the flapping airfoil increases at first and then decreases with the increase of the blunt trailing edge thickness.When the ratio of the blunt trailing edge thickness to the chord length of airfoil l/c=0.02,the improvement influence of the energy harvesting efficiency of the blunt trailing edge flapping airfoil reaches the threshold.As the thickness of the airfoil gradually increases,the energy harvesting efficiency of blunt trailing flapping airfoil first increases and then decreases,and reaches its peak when the airfoil is NACA0030.
作者
张刚
孙晓晶
Zhang Gang;Sun Xiaojing(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer,Shanghai 200093,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2023年第5期457-465,共9页
Acta Energiae Solaris Sinica
基金
国家自然科学基金面上项目(52176194)。
关键词
风力机
计算流体力学
厚度
位置
扑翼获能
钝尾缘
wind turbines
computational fluid dynamics
thickness
position
energy harvesting flapping airfoil
blunt trailing edge
