零质量射流对风力机翼型动态失速特性的影响
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摘要
为了改善风力机大厚度翼型的气动性能,采用零质量射流对翼型附近的流动进行流动控制。采用非定常雷诺时均模拟方法(URANS)对动态失速状态下带零质量射流的DU97-W-300翼型的绕流场进行数值模拟,并对比控制前和控制后的翼型气动特性。结果表明,随着射流折合频率的增加,翼型失速攻角逐渐增大,升力系数曲线的波动次数逐渐减小。零质量射流可以有效抑制流动分离,其抑制动态失速的能力随翼型折合频率的增加而增强,随激励器动量系数的增加而增强。
In order to improve the aerodynamic performance of large thickness airfoil on wind turbine, Unsteady Reynolds Average Navier Stokes(URANS) method was used to simulate the flow field around DU300 airfoil with zero-net-mass-flux(ZNMF) jets under dynamic stall condition,and the aerodynamic characteristics of airfoil without/with ZNMF jets were compared. The results show that as the reduced frequency increases, the stall angle attack increases gradually, and the number of fluctuations of the lift coefficient decreases. The ZNMF jets can effectively restrain the flow separation, and its ability to restrain the dynamic stall increases with the increasing reduced frequency of the airfoil and with the larger momentum coefficient of the exciter.
In order to improve the aerodynamic performance of large thickness airfoil on wind turbine, Unsteady Reynolds Average Navier Stokes(URANS) method was used to simulate the flow field around DU300 airfoil with zero-net-mass-flux(ZNMF) jets under dynamic stall condition,and the aerodynamic characteristics of airfoil without/with ZNMF jets were compared. The results show that as the reduced frequency increases, the stall angle attack increases gradually, and the number of fluctuations of the lift coefficient decreases. The ZNMF jets can effectively restrain the flow separation, and its ability to restrain the dynamic stall increases with the increasing reduced frequency of the airfoil and with the larger momentum coefficient of the exciter.
引文
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[2] Xiao Q,Liu W,Incecik A.Flow control for VATT byfixed and oscillating flap[J].Renewable Energy,2013,51(51):141-152.
[3]戴丽萍,许雅萍,周强,等.涡发生器对风力机翼型动态失速的影响[J].工程热物理学报,2018,39(8):1706-1712.
[4]祝健,康顺,王晓东.激励特性对零质量射流的影响[J].工程热物理学报,2017,38(6):1-7.
[5]张攀峰,王晋军,冯立好.零质量射流技术及其应用研究进展[J].中国科学(E辑:技术科学),2008,38(3):321-349.
[6] Maldonado V,Farnsworth J,Gressick W,et al.Activecontrol of flow separation and structural vibrations ofwind turbine blades[J].Wind Energy,2010,13(2-3):221-237.
[7] Yen J,Ahmed N A.Enhancing vertical axis wind turbineby dynamic stall control using synthetic jets[J].Journalof Wind Engineering and Industrial Aerodynamics,2013,114(114):12-17.
[8] Taylor K,Leong C M,Amitay M.Load control on adynamically pitching finite span wind turbine bladeusing synthetic jets[J].Wind Energy,2015,18(10):1759-1775.
[9]左伟,顾蕴松,程克明,等.斜出口合成射流控制机翼分离流实验研究[J].实验流体力学,2014,28(6):45-50.
[10] Kral L D.Active flow control technology[R].New York:ASME Fluids Engineering Division Newsletter,1998.
[11]胡丹梅.水平轴风力机尾迹气动特性研究[D].上海:上海交通大学,2006.
[12] Ramsay R F,Hoffman M J,Gregorek G M.Effect of gritroughness and pitch oscillation on the S809 airfoil[R].Golden:National Renewable Energy Laboratory,1995.
[13]张攀峰,燕波,戴晨峰.合成射流环量控制翼型增升技术[J].中国科学(E辑:技术科学),2012,42(9):1046-1053.