For wind farms with low air density, when the wind turbine is running near the rated wind speed, the blade roots will stall and seriously affect the stable operation of the unit. In order to solve the problem of blade stall, this paper proposes two solutions for the advance pitching strategy and the root canal root can be installed. At the same time, the two schemes are verified by three-dimensional numerical simulation. The results show that the two methods can reduce the surface separation of the blade. The advanced pitch control strategy can increase the power of the unit by about 1.78%, while the root box can increase the power of the unit by about 2.14%, that is to say the effect of installing the root box is more obvious in the improvement effect. But for the built wind field, from the economical consideration, the effect of using the advanced pitch control strategy to solve the blade stall problem is more effective.
表1 功率随桨距角变化表 Table 1 Variation of power with pitch angle
叶片
桨距角/(°)
功率/kW
原叶片
0
1 412.5
原叶片
1.5
1 438.4
改型叶片
0
1 442.7
表1 功率随桨距角变化表
图11 叶片表面极限流线分布
[1]
YU Guohua. Research on stall of horizontal axis wind turbine blades[D]. Shanghai: Shanghai Jiaotong University, 2013.
[1]
俞国华. 水平轴风力机叶片失速问题研究[D]. 上海：上海交通大学，2013.
[2]
BUTTERFIELD C P. Aerodynamic pressure and flow-visualization measurement from arotating wind turbine blade[R]. Solar Energy Research Inst., Golden, co(USA), 1988.
[3]
LEISHMAN J G, BEDDOES T S. A generalized method for unsteady airfoil behavior and dynamic stall using the indicial method[C]//42nd Annual Forum of the American Helicopter Society, Washington DC, 1986.
[4]
XING Zuoxia, CHEN Lei, SUN Hongli. Strategies study of individual variable pitch control[J]. Proceedings of the CSEE, 2011, 31(26): 131-138.
LIU Tingrui, YU Ziqing. Nonlinear flutter servo aeroelastic intelligent control of wind turbine blade stall[J]. Journal of Central South University (Natural Science Edition), 2016, 47(10): 3562-3569.
CHEN Yan, WANG Xiaohu, LIU Xiong, et al. Analysis of steady stall aerodynamic damping of horizontal axis wind turbine blade[J]. ACTA Energiae Solaris Sinica, 2011, 32(9): 1294-1302.
LI Rennian, YUAN Shangke, WEI Liejiang, et al. Measurement and calculation of blade surface pressure for a wind turbine in field[J]. Journal of Experiments in Fluid Mechanics, 2012, 26(5): 52-56.
