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。
Abstract
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.
关键词
风力机 /
计算流体力学 /
厚度 /
位置 /
扑翼获能 /
钝尾缘
Key words
wind turbines /
computational fluid dynamics /
thickness /
position /
energy harvesting flapping airfoil /
blunt trailing edge
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] XIAO Q, ZHU Q.A review on flow energy harvesters based on flapping foils[J]. Journal of fluids and structures, 2014, 46: 174-191.
[2] YOUNG J, LAI J C S, PLATZER M F. A review of progress and challenges in flapping foil power generation[J]. Progress in aerospace sciences, 2014, 67: 2-28.
[3] 张来超, 黄典贵. 雷诺数对扑翼获能特性的影响[J]. 太阳能学报, 2018, 39(3): 643-650.
ZHANG L C, HUANG D G.Effect of Reynolds number on oscillating-airfoil power generator[J]. Acta energiae solaris sinica, 2018, 39(3): 643-650.
[4] MCKINNEY W, DELAURIER J.Wingmill: an oscillating-wing windmill[J]. Journal of energy, 1981, 5(2): 109-115.
[5] XIAO Q, LIAO W, YANG S C, et al.How motion trajectory affects energy extraction performance of a biomimic energy generator with an oscillating foil[J]. Renewable energy, 2012, 37(1): 61-75.
[6] WANG Y, SUN X J, HUANG D G, et al.Numerical investigation on energy extraction of flapping hydrofoils with different series foil shapes[J]. Energy, 2016, 112: 1153-1168.
[7] LI W Z, WANG W Q, YAN Y.The effects of outline of the symmetrical flapping hydrofoil on energy harvesting performance[J]. Renewable energy, 2020, 162: 624-638.
[8] ISMAIL M F, VIJAYARAGHAVAN K.The effects of aerofoil profile modification on a vertical axis wind turbine performance[J]. Energy, 2015, 80: 20-31.
[9] MICHNA J, ROGOWSKI K, BANGGA G, et al.Accuracy of the Gamma Re-Theta transition model for simulating the DU-91-W2-250 airfoil at high Reynolds numbers[J]. Energies, 2021, 14(24): 8224.
[10] 徐浩然, 杨华, 刘超. 风力机翼型尾缘加厚修型优化[J]. 太阳能学报, 2015, 36(3): 743-748.
XU H R, YANG H, LIU C.Optimization of enlarging the thickness of airfoil’s trailing-edge for wind turbines[J]. Acta energiae solaris sinica, 2015, 36(3): 743-748.
[11] 韩中合, 焦红瑞. 加装钝尾缘改善风力机桨叶气动性能的研究[J]. 动力工程, 2009, 29(11): 1073-1077.
HAN Z H, JIAO H R.Study on aerodynamic performance of airfoil by mounting a blunt trailing edge to wind blade[J]. Power engineering, 2009, 29(11): 1073-1077.
[12] ZHANG X, LI W, LIU H L.Numerical simulation of the effect of relative thickness on aerodynamic performance improvement of asymmetrical blunt trailing-edge modification[J]. Renewable energy, 2015, 80: 489-497.
[13] JAAFAR R K, MOURAD M G, ATEEQ A A, et al.Effect of thick trailing edge on the aerodynamic performance of NACA 0012 airfoil[J]. Design engineering, 2021: 17236-17247.
[14] YOO H S, LEE J C.Numerical analysis of NACA64-418 airfoil with blunt trailing edge[J]. International journal of aeronautical and space sciences, 2015, 16(4): 493-499.
[15] LI Y C, ZHANG N, PAN Z Y.Propulsive performance of a newly conceptual design of flapping foil with fixed Gurney plate-a numerical study[J]. Ocean engineering, 2021, 239: 109800.
[16] KINSEY T, DUMAS G, LALANDE G, et al.Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils[J]. Renewable energy, 2011, 36(6): 1710-1718.
[17] KINSEY T, DUMAS G.Three-dimensional effects on an oscillating-foil hydrokinetic turbine[J]. Journal of fluids engineering, 2012, 134(7): 071105.
[18] SUN G, WANG Y, XIE Y D, et al.Hydrodynamic and energy extraction properties of oscillating hydrofoils with a trailing edge flap[J]. Applied ocean research, 2021, 110:102530.
基金
国家自然科学基金面上项目（52176194）
PDF(4125 KB)
