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The BAY model is the earliest parametric model in which a small number of grid cells are employed to model the VGs, yet it is not able to precisely provide the grid cell locations representing the VGs ( Bender et al., 1999). In order to overcome this problem, numerous parametric models have been established related to flow and VG geometry parameters, replacing the physical VGs in CFD research. However, small-sized VGs substantially increase the numerical cost of large-size wind turbine blades with VGs. VG can effectively control the air flow and enhance the power production of wind turbine ( Astolfi et al., 2019), so it has recently been the focus of much research in the field of wind turbines.Ĭomputational fluid dynamics (CFD) is key in the evaluation of the aerodynamic performance of wind turbines. The trailing vortices shedding from the trailing-edge of the VGs increase the mixing of the high-energy flow outside the boundary layer with the low-energy flow inside the boundary layer, enlarge the momentum and energy of the airflow within the boundary layer, and delay the airflow separation ( Godard and Stanislas, 2006 Fernandez et al., 2012). An incidence angle is formed between the VG and the airstream as the latter flows through the former.
#VELOCITY OVER AN AIRFOIL GENERATOR GENERATOR#
The vortex generator (VG), initially proposed by Taylor (1947), is a passive flow control technology that can effectively improve the aerodynamic performance of wind turbine blades. The VG parametric model expresses VG parameters by program, which can improve the research efficiency of VG arrangement on wind turbine blades. This proves the high universality of the proposed approaches and demonstrates the potential of the parametric model in replacing the VG entity model. The results reveal a high consistency between the vortex structure, the velocity profile above the blade surface and the distribution of the pressure coefficient calculated by the two models.
![velocity over an airfoil generator velocity over an airfoil generator](https://skill-lync-portal.nyc3.digitaloceanspaces.com/tinymce/07_20/15941328775486.jpg)
The numerical results of the models are then compared and analyzed at different incoming flow velocities and AoAs to verify the universality of the proposed parametric approaches. Comparisons demonstrate a strong agreement between the modelled and experimental results, proving the high accuracy of the two models. Our approach is validated using experimental data. The proposed parametric model and an entity model at different angles of attack (AoAs) are implemented on the blade section. These techniques are integrated with a maximum circulation algorithm by considering the interactions between VG pairs to predict the performance of a DU91-W2-250 blade section with VGs.
#VELOCITY OVER AN AIRFOIL GENERATOR SERIES#
In order to improve the accuracy of such parametric models, this study proposed a series of modeling approaches to determine the positions of the adding source term in Cartesian coordinates, the VG vortex core radius, etc., on the wind turbine airfoils. Parametric models of VGs can effectively improve the numerical research efficiency of wind turbine blades with VGs.
![velocity over an airfoil generator velocity over an airfoil generator](https://ars.els-cdn.com/content/image/1-s2.0-S0167610516302653-gr5.jpg)
Large-size wind turbine blades equipped with small size VGs make the computational fluid dynamics (CFD) researches require a great deal of computational resources. 3Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design, Nanjing University of Aeronautics and Astronautics, Nanjing, ChinaĬounter-rotating vortex generators (VGs) are typically employed to delay airflow separation on wind turbine blades.2Institution of Ocean and Offshore Engineering, Hohai University, Nantong, China.1College of Energy and Electrical Engineering, Hohai University, Nanjing, China.Ming Chen 1, Zhenzhou Zhao 1,2*, Huiwen Liu 1, Tongguang Wang 3, Lingyu Meng 1, Junxin Feng 1, Ruifang Jiang 1 and Dingding Wang 1