为提高传统直叶片升力型（H型）垂直轴水轮机的获能效率,提出一种带前缘可偏转叶片的新型垂直轴水轮机,利用计算流体力学（CFD）方法,结合重叠网格和动网格技术对这种新型垂直轴水轮机叶轮的水动力性能进行系统的数值模拟计算,分析不同叶尖速比下带前缘偏转叶片的垂直轴水轮机绕流流场,从而探究前缘偏转角度和偏转长度对这种水轮机动力性能和获能效率的影响规律。结果表明,根据叶片旋转到不同位置时实施前缘偏转可改变来流攻角从而减缓或抑制叶片吸力面的流动分离,有效改善其动态失速特性,进而使H型垂直轴水轮机的水动力性能和获能效率得到明显提升。研究发现,低叶尖速比下这种改善效果最为显著,可拓宽H型垂直轴水轮机高效运行的工作范围。
Abstract
This paper aims at improving the efficiency of the H-type vertical axis hydraulic turbine by using the blade with variable droop leading edge. The two dimensional URANS numerical simulations were conducted, and the hydrodynamic performance of this new type of vertical axis hydraulic turbine was numerically simulated by combining overset mesh and dynamic mesh. The performance of the vertical axis hydraulic turbine with the variable droop leading edge at different tip speed ratios was analyzed, and the effects of the flap angle and flap length on the power-extraction efficiency of the vertical axis hydraulic turbine were also studied. From the simulation results, it could be seen that when the blade rotates to different positions, the variable droop leading edge could change the angle of attack and the flow separation on the suction surface was reduced. The dynamic stall characteristics of the blade could also be improved. The variable droop leading edge is proved to be beneficial to the power generation, and especially at lower tip speed ratio, the operating range of the H-type vertical axis hydraulic turbine is expanded.
关键词
水电 /
计算流体力学 /
能量转换效率 /
前缘偏转 /
垂直轴水轮机
Key words
hydroelectric power /
computational fluid dynamics /
conversion efficiency /
variable droop leading edge /
vertical axis
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参考文献
[1] 刘伟民, 刘蕾, 陈凤云, 等. 中国海洋可再生能源技术进展[J]. 科技导报, 2020, 38(14): 27-39.
LIU W M, LIU L, CHEN F Y, et al.Technical progress of marine renewable energy in China[J]. Science & technology review, 2020, 38(14): 27-39.
[2] 张理, 李志川. 潮流能开发现状、发展趋势及面临的力学问题[J]. 力学学报, 2016, 48(5): 1019-1032.
ZHANG L, LI Z C.Development status, trend and the problems of mechanics of tidal current energy[J]. Chinese journal of theoretical and applied mechanics, 2016, 48(5): 1019-1032.
[3] XIAO Q, LIU W D, INCECIK A.Flow control for VATT by fixed and oscillating flap[J]. Renewable energy, 2013, 51: 141-152.
[4] CHEN B, SU S S, VIOLA I M, et al.Numerical investigation of vertical-axis tidal turbines with sinusoidal pitching blades[J]. Ocean engineering, 2018, 155: 75-87.
[5] VELASCO D, LOPEZ M O, LAIN S.Numerical simulations of active flow control with synthetic jets in a Darrieus turbine[J]. Renewable energy, 2017, 113: 129-140.
[6] 陆维爽, 田云, 刘沛清, 等. GAW-1翼型前后缘变弯度气动性能研究[J]. 航空学报, 2016, 37(2): 437-450.
LU W S, TIAN Y, LIU P Q, et al.Aerodynamic performance of GAW-1 airfoil leading-edge and trailing-edge variable camber[J]. Acta aeronautica et astronautica sinica, 2016, 37(2): 437-450.
[7] NIU J P, LEI J M, LU T Y.Numerical research on the effect of variable droop leading-edge on oscillating NACA 0012 airfoil dynamic stall[J]. Aerospace science and technology, 2018, 72: 476-485.
[8] ZHAO G Q, ZHAO Q J.Dynamic stall control optimization of rotor airfoil via variable droop leading-edge[J]. Aerospace science and technology, 2015, 43: 406-414.
[9] BAIN J J, SANKAR L N, PRASAD J, et al.Computational modeling of variable-droop leading edge in forward flight[J]. Journal of aircraft, 2009, 46(2): 617-626.
[10] MA Y Y, ZHAO Q J, ZHAO G Q.New combinational active control strategy for improving aerodynamic characteristics of airfoil and rotor[J]. Proceedings of the institution of mechanical engineers Part G journal of aerospace engineering, 2019, 234(4): 095441001989319.
[11] ZHANG Y Q, GE W J, ZHANG Z, et al.Design of compliant mechanism-based variable camber morphing wing with nonlinear large deformation[J]. International journal of advanced robotic systems, 2019, 16(6): 172988141988674.
[12] SUN J J, HUANG D G.Numerical investigation on aerodynamic performance improvement of vertical-axis tidal turbine with super-hydrophobic surface[J]. Ocean engineering, 2020, 217: 107995.
[13] BOUZAHER M T, HADID M.Numerical investigation of a vertical axis tidal turbine with deforming blades[J]. Arabian journal for science and engineering, 2017, 42(5): 2167-2178.
[14] ELKHOURY M, KIWATA T, AOUN E.Experimental and numerical investigation of a three-dimensional vertical-axis wind turbine with variable-pitch[J]. Journal of wind engineering and industrial aerodynamics, 2015, 139: 111-123.
[15] REZAEIHA A, MONTAZERI H, BLOCKEN B.On the accuracy of turbulence models for CFD simulations of vertical axis wind turbines[J]. Energy, 2019, 180: 838-857.
[16] DAROCZY L, JANIGA G, PETRASCH K, et al.Comparative analysis of turbulence models for the aerodynamic simulation of H-Darrieus rotors[J]. Energy, 2015, 90: 680-690.
[17] BALDUZZI F, BIANCHINI A, MALECI R, et al.Critical issues in the CFD simulation of Darrieus wind turbines[J]. Renewable energy, 2016, 85: 419-435.
[18] WANG Y, SUN X J, ZHU B, et al.Effect of blade vortex interaction on performance of Darrieus-type cross flow marine current turbine[J]. Renewable energy, 2016, 86: 316-323.
[19] MA N, LEI H, HAN Z L, et al.Airfoil optimization to improve power performance of a high-solidity vertical axis wind turbine at a moderate tip speed ratio[J]. Energy, 2018, 150: 236-252.
[20] LIU Q S, MIAO W P, LI C, et al.Effects of trailing-edge movable flap on aerodynamic performance and noise characteristics of VAWT[J]. Energy, 2019, 189: 116271.
[21] LI Y, CALISAL S M.Three-dimensional effects and arm effects on modeling a vertical axis tidal current turbine[J]. Renewable energy, 2010, 35(10): 2325-2334.
[22] REZAEIHA A, MONTAZERI H, BLOCKEN B.Characterization of aerodynamic performance of vertical axis wind turbines: impact of operational parameters[J]. Energy conversion and management, 2018, 169: 45-77.
基金
国家自然科学基金面上基金项目（52176194）
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