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Effect of angle of attack on aerodynamic characteristics of levitated freestream-aligned circular cylinder

Sho Yokota*, Keisuke Asai, and Taku Nonomura

  • Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki-aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan

  • *sho.yokota.r1@dc.tohoku.ac.jp
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Phys. Rev. Fluids 8, 024701 – Published 13 February, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.024701

Abstract

An effect of an angle of attack on the aerodynamic characteristics of a freestream-aligned circular cylinder is investigated and discussed. The experiment without support interference was conducted using a magnetic suspension and balance system (MSBS) which can levitate and support a model. A cylindrical model with a fineness ratio of 1.0 was employed in wind tunnel tests. The Reynolds numbers based on the diameter of the model were 3.3×104 and 6.7×104. The range of the angle of attack is from 0 to 15∘. Aerodynamic forces and velocity fields were obtained by the MSBS and particle image velocimetry. The results of the time-averaged aerodynamic force and moment coefficients and the time-averaged velocity field illustrate that the flow reattachment occurs at an angle of 9∘ or more. The flow reattachment changes the aerodynamic characteristics, especially the lift and pitching moment coefficients and the lift force fluctuations.

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Phys. Rev. Fluids 8, 024701– Published 13 February, 2023
  • Received 15 August 2022
  • Accepted 2 February 2023
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