Control of a subsonic separated flow with the use of low-frequency flow oscillations

A. V. Boiko, A. V. Dovgal, A. M. Sorokin

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: An incompressible gas flow past a two-dimensional backward-facing step on the flat plate surface is experimentally studied under the conditions of a controlled low-frequency action on the separated flow. It is found that flow oscillations whose frequency is smaller by an order of magnitude than the frequency typical for convective instability of the separated boundary layer induce significant changes of the time-averaged and fluctuating characteristics of the flow in the separation region.

Keywords: hydrodynamic stability, boundary layer separation, flow past a backward-facing step, unsteady flow.

UDC: 523.526

Received: 10.07.2024
Revised: 10.07.2024
Accepted: 29.07.2024

DOI: 10.15372/PMTF202415564

 English version: Journal of Applied Mechanics and Technical Physics, 2025, 66:2, 328–332

Bibliographic databases:

•