International Conference of Physicists.SPb, October 20-24, 2025, Saint Petersburg
Aero and hydrodynamics

Instability of local supersonic regions on an airfoil with a spoiler

A. G. Kuz'min

Saint Petersburg State University

Abstract: The turbulent transonic airflow over NASA SC(2)-0710 airfoil with a spoiler is studied numerically. Solutions of the Reynolds-averaged Navier–Stokes equations are obtained with a finite-volume solver. The solutions reveal a high sensitivity of flow pattern to values of the spoiler deflection angle, as well as to changes in the freestream Mach number $M_\infty$ and angle of attack $\alpha$. The existence of lift coefficient hysteresis in narrow bands of $M_\infty$ and $\alpha$ is shown.

Keywords: airfoil, transonic flow, shock waves, instability.

Received: 17.04.2025
Revised: 15.07.2025
Accepted: 25.07.2025

DOI: 10.61011/JTF.2025.12.61799.216-25

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