Journal of South China University of Technology(Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (10): 96-104,112.doi: 10.12141/j.issn.1000-565X.200021

• Mechanical Engineering • Previous Articles     Next Articles

Wake Vortex Shedding Flow Analysis of Two-Dimension Airfoil with Different Reynolds Numbers

YANG Xiaopei WANG Wei JIANG Boyan DING Yanyan WANG Jun   

  1. School of Energy and Power Engineering，Huazhong University of Science and Technology，Wuhan 430074，Hubei，China
  • Received:2020-01-13 Revised:2020-03-24 Online:2020-10-25 Published:2020-09-14
  • Contact: 王军(1963-)，男，博士，教授，博士生导师，主要从事流体机械内流机理、叶轮机械二次流动与非定常流 动等的研究。 E-mail:wangjhust@163. com
  • About author:杨筱沛(1992-)，女，博士生，主要从事流体机械内流机理及控制研究。E-mail: yxp1992@ hust. edu. cn
  • Supported by:
    Supported by the National Key R＆D Program of China (2018YFB0606101)

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Abstract: The wake vortex shedding flow mechanism of airfoils at different Reynolds numbers (Re =5 ×104 ，1 ×
105 ，2 ×105 ，5 ×105 ，respectively) was analyzed in this paper，by generating algebraic meshes with Hermite in-
terpolation function． The results show that，when periodic flow occurs，Strouhal number increases with the increase
of Re at the same angle of attack as the fluid viscosity decreases; and that，the variation of lift coefficient of airfoil
is consistent with that of wake vortex shedding． The peak lift coefficient appears just after the tail edge counter-
clockwise vortex sheds，while the valley lift coefficient appears when the tail edge counterclockwise vortex reaches
the maximum size． When the airfoil enters the periodic flow state，the development law of wake vortex shedding is
2S (Single) mode first，then 2P (Pair) mode，chaotic state，and finally quasi-periodic flow state，as the angle of
attack increases． The investigation into the aerodynamic characteristics and wake vortex shedding mechanism pro-
vides a basis for the design of flow control methods．

Key words: two-dimension airfoil, algebraic meshes, unsteady flow, wake vortex shedding

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