Volume 20, Issue 5 (May 2020)
Modares Mechanical Engineering 2020, 20(5): 1157-1169 |
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1- Aerospace Engineering Department, New Sciences & Technologies Faculty, University of Tehran, Tehran, Iran , shahrokh.shams@ut.ac.ir
2- 1Aerospace Engineering Department, New Sciences & Technologies Faculty, University of Tehran, Tehran, Iran
2- 1Aerospace Engineering Department, New Sciences & Technologies Faculty, University of Tehran, Tehran, Iran
Abstract: (2913 Views)
The aerodynamic of Vertical Axis Wind Turbine (VAWT) is more complex than a horizontal axis wind turbine. In the present research, the combination of the Wagner unsteady aerodynamic model, static stall and Double Multiple Stream Tube (DMST) aerodynamic model have been used to investigate the aeroelastic behavior of VAWT. For this purpose, the DMST aerodynamic model, which is related to the vertical axis wind turbine aerodynamics model, has been used to obtain two parameters of the angle of attack and relative velocity. Then these two parameters have been applied to the Wagner nonlinear aerodynamics, which considers the effect of the static stall. This flexible nonlinear presented model based on DMST is called NFDMST aerodynamic model. One-degree of freedom of typical section and two-degree of freedom model have been investigated for static aeroelasticity and dynamic aeroelastic behavior, respectively. The VAWT blade experiences a variety of attack angles and relative velocity in a spin, so the goal is to obtain the instability velocity in a different position and consider the effect of aerodynamic and structure nonlinearity. The results show that the nonlinear aerodynamic model has accurate results and the aeroelastic design condition associated with -90degree azimuth angle, in which the minimum instability velocity is 45.2m/s. In addition, the change of instability speed of rotating airfoil in a spin is about 6%.
Article Type: Original Research |
Subject:
Aerodynamics
Received: 2019/06/3 | Accepted: 2019/10/15 | Published: 2020/05/9
Received: 2019/06/3 | Accepted: 2019/10/15 | Published: 2020/05/9
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