Modares Mechanical Engineering

Modares Mechanical Engineering

Parametric Study on the Influence of Moving Surface Length and Speed on Performance Enhancement of Offshore Horizontal-Axis Wind Turbine

Document Type : Original Article

Authors
Mojtaba Tahani
Alireza Shahrabi Farahani
Darian Razavifar
Fatemeh Faramarzlou
Amirhossein Hossein
College of Interdisciplinary Science and Technology, Tehran University, Tehran, Iran
10.48311/mme.2025.96919.0
Abstract
The implementation of a moving surface in the aerodynamic profile of an airfoil is recognized as an effective active flow control mechanism. In this study, the effect of this mechanism on the aerodynamic and mechanical performance of an offshore horizontal-axis wind turbine blade at a Reynolds number of 7.5×105 was investigated. The S809 airfoil was selected as the blade section, and part of its suction surface was replaced with a moving surface. Simulations were performed using the commercial software ANSYS Fluent with the k-ω SST turbulence model, and the results were validated against available experimental data. To evaluate the influence of the moving surface length and speed, relative lengths (l) ranging from 0.05 to 0.55 chord and speed ratios of (k) 1,3 and 5 times the free-stream velocity were examined at a fixed installation location of s = 0.01 chord. The moving surface delayed stall angle by up to 80%, such that the drop in the lift curve shifted from an AoA of 8° to 12°, and the mechanical performance improved by a factor of five to seven depending on the AoA. At higher angles of attack, shorter lengths maintained flow control while reducing power consumption. In the aerodynamic analysis using the Blade Element Momentum method, the maximum power coefficient at a TSR of 4 increased by up to 4.6 times, while the torque coefficient at the same point increased by 364%. The moving surface showed the greatest effect at low TSRs, improving both aerodynamic and mechanical performance
Keywords
Offshore Horizontal-Axis Wind Turbine (HAWT)
Active Flow Control
Computational Fluid Dynamics (CFD)
Blade Element Momentum (BEM)
Moving Surface
Subjects
[1]            I. Dincer, "Renewable energy and sustainable development: a crucial review," Renewable and Sustainable Energy Reviews, vol. 4, no. 2, pp. 157-175, 2000, doi:10.1016/s1364-0321(99)00011-8.
[2]          M. Balat, "A Review of Modern Wind Turbine Technology," Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, vol. 31, no. 17, pp. 1561-1572, 2009,
doi:10.1080/15567030802094045.
[3]          M. Khudri Johari, M. Azim A Jalil, and M. Faizal Mohd Shariff, "Comparison of horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT)," International Journal of Engineering & Technology, vol. 7, no. 4.13, pp. 74-80, 2018,
doi:10.14419/ijet.v7i4.13.21333.
[4]          K. He and J. Ye, "Dynamics of offshore wind turbine-seabed foundation under hydrodynamic and aerodynamic loads: A coupled numerical way," Renewable Energy, vol. 202, pp. 453-469, 2023,
doi:10.1016/j.renene.2022.11.029.
[5]          M. E. Kazemian, A. H. Kazemian, and S. M. Jaafarian, "Effect of Gurney Flap on Airfoil Lift Coefficient by Design of Experiment (DOE) Method," (in eng), Modares Mechanical Engineering, vol. 19, no. 12, pp. 2857-2863, 2019. [Online]. Available: http://mme.modares.ac.ir/article-15-20880-fa.html.
 
[6]          M. Garshasbi, M. M. Jafari, and H. Parhizkar, "Numerical Analysis of Flow Separation Control on a BWB Drone Using a Vortex Generator," (in eng), Modares Mechanical Engineering, vol. 19, no. 2, pp. 447-456, 2019. [Online]. Available: http://mme.modares.ac.ir/article-15-20416-fa.html.
[7]          M. Tahani, M. Kazemi, and Z. Babaie, "Investigation of Aerodynamic and Heat Transfer Performance of Cylinders Using Plasma Actuators," (in eng), Modares Mechanical Engineering, vol. 19, no. 9, pp. 2111-2120, 2019. [Online]. Available: http://mme.modares.ac.ir/article-15-21163-en.html.
[8]          H. Kanani and R. Khaki, "Optimization of geometric parameters and excitation frequency of a synthetic jet to avoid separation on the airfoil _," (in eng), Modares Mechanical Engineering, vol. 17, no. 12, pp. 65-76, 2018. [Online]. Available: http://mme.modares.ac.ir/article-15-3162-fa.html.
[9]          A. Rabienataj Darzi and S. Vadudi Mofid, "Flow Control via Co-Flow Jet over Clark-Y Airfoil," (in eng), Modares Mechanical Engineering, vol. 17, no. 2, pp. 147-156, 2017. [Online]. Available: http://mme.modares.ac.ir/article-15-7467-fa.html.
[10]        S. E. Salimipour, "Flow Control and Drag Reduction of Circular Cylinder Using Moving Surfaces by Two-dimensional Simulation," (in eng), Modares Mechanical Engineering, vol. 16, no. 12, pp. 12-20, 2017. [Online]. Available: http://mme.modares.ac.ir/article-15-609-fa.html.
[11]        V. J. Modi, "Moving Surface Boundary-Layer Control: A Review," Journal of Fluids and Structures, vol. 11, no. 6, pp. 627-663, 1997,
doi:10.1006/jfls.1997.0098.
[12]        A. Z. Al-Garni, A. M. Al-Garni, S. A. Ahmed, and A. Z. Sahin, "Flow Control for an Airfoil with Leading-Edge Rotation: An Experimental Study," Journal of Aircraft, vol. 37, no. 4, pp. 617-622, 2000, doi:10.2514/2.2673.
[13]        R. Sahu, C. Ranganayakulu, and B. S. V. Patnaik, "CFD simulation of momentum injection control past a streamlined body," International Journal of Numerical Methods for Heat & Fluid Flow, vol. 21, no. 8, pp. 980-1001, 2011,
doi:10.1108/09615531111177750.
[14]        I. Korkischko and J. R. Meneghini, "Suppression of vortex-induced vibration using moving surface boundary-layer control," Journal of Fluids and Structures, vol. 34, pp. 259-270, 2012,
doi:10.1016/j.jfluidstructs.2012.05.010.
[15]        M. I. Khar, K. Ahasan, and M. Ali, "Numerical investigation of drag reduction using moving surface boundary layer control (MSBC) on NACA 0012 airfoil," in AIP Conference Proceedings, 2018, vol. 1980, no. 1: AIP Publishing LLC, p. 040011,
doi:10.1063/1.5044321.
[16]        M. Amin Boukenkoul, F.-C. Li, W.-L. Chen, and H.-N. Zhang, "Lift-Generation and Moving-Wall Flow Control Over a Low Aspect Ratio Airfoil," Journal of Fluids Engineering, vol. 140, no. 1, p. 011104, 2018, doi:10.1115/1.4037681.
[17]        E. Salimipour and A. Salimipour, "Power minimization and vortex shedding elimination of a circular cylinder by moving surface mechanism," Ocean Engineering, vol. 189, p. 106408, 2019,
doi:10.1016/j.oceaneng.2019.106408.
[18]        T. Song, X. Liu, and F. Xu, "Moving Surface Boundary-Layer Control on the Wake of Flow around a Square Cylinder," Applied Sciences, vol. 12, no. 3, p. 1632, 2022, doi:10.3390/app12031632.
[19]        Y. Zhang and Y. Zhao, "Novel design of a circulation control airfoil with cylinder rotation," Physics of Fluids, vol. 35, no. 8, 2023, doi:10.1063/5.0158974.
[20]        M. S. Doğan, "Effect of Moving Surface Boundary-Layer Control on Aerodynamic Characteristics of Airfoils," Southern Illinois University at Edwardsville, 2023. [Online]. Available: https://www.proquest.com/dissertations-theses/effect-moving-surface-boundary-layer-control-on/docview/2852254889/se-2?accountid=45153
[21]        H. Zhang, B. Zhu, and W. Chen, "Enhancing Energy Harvesting Efficiency of Flapping Wings with Leading-Edge Magnus Effect Cylinder," Biomimetics (Basel), vol. 9, no. 5, p. 293, May 13 2024,
doi:10.3390/biomimetics9050293.
Modares Mechanical Engineering
Volume 25, Issue 12
December 2025
Pages 785-800