Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder

Rong Han, Wei Liu, Xiao-Liang Yang and Xing-Hua Chang
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Rong Han: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Wei Liu: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Xiao-Liang Yang: College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
Xing-Hua Chang: Unmanned Systems Research Center, National Innovation Institute of Defense Technology, Beijing 100071, China

Energies, 2021, vol. 14, issue 17, 1-17

Abstract: The flow past a cylinder is a classical problem in flow physics. In a certain range of Reynolds number, there will be Karman vortex street phenomenon in the wake of a cylinder, which will greatly increase the pressure drag of the cylinder. By controlling the vortex shedding phenomenon, drag reduction of the cylinder could be effectively realized. In this paper, a NACA0012 airfoil with pitching oscillation is placed downstream of the cylinder. Based on the tight coupling method, kinematics equations and Navier–Stokes equations in the arbitrary Lagrangian–Eulerian form are solved. Firstly, the effect of airfoil oscillation period and the distance between airfoil leading edge and cylinder center ( x / D ) are studied respectively, especially considering the aspects of vortex shedding and drag reduction effect. Besides, the vortex interaction in the flow field around the airfoil and cylinder is analyzed in detail. It is found that the NACA0012 airfoil with pitching oscillation can change the period of vortex shedding. Moreover, it can also increase the drag reduction rate to as high as 50.5%, which presents a certain application prospect in the engineering drag reduction field, e.g., for launch vehicles, ship masts, submarine pipelines, etc.

Keywords: flow past a circular cylinder; Karman vortex street; NACA0012 airfoil; pitching oscillation; drag reduction mechanism (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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