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Investigation of sharp change in the lift of a thick teardrop airfoil at low Reynolds numbers

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Thermophysics and Aeromechanics Aims and scope

Abstract

Two wind tunnels were employed for study of a thick teardrop airfoil with the relative thickness of 40 %. Experiments were conducted for Reynolds number in the range from 2·104 to 12·104 and the angle of attack from −10° to +10°. The weight-in-flow measurements and PIV-method visualization were performed. Experiments revealed a strong impact of the free-stream pulsations on the aerodynamic force coefficients. The following phenomena were demonstrated: drag crisis, hysteresis for the lift force vs. angle of attack, and reversing for the lift force direction. Data analysis investigates the roots of these effects.

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Authors and Affiliations

  1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

    M. A. Akimov & P. A. Polivanov

  2. Novosibirsk State Technical University, Novosibirsk, Russia

    M. A. Akimov & P. A. Polivanov

Authors
  1. M. A. Akimov
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  2. P. A. Polivanov
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Correspondence to M. A. Akimov.

Additional information

The work was supported financially by the Russian Science Foundation (Grant No. 20-49-08006).

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Akimov, M.A., Polivanov, P.A. Investigation of sharp change in the lift of a thick teardrop airfoil at low Reynolds numbers. Thermophys. Aeromech. 28, 805–809 (2021). https://doi.org/10.1134/S0869864321060044

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  • DOI: https://doi.org/10.1134/S0869864321060044

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