Separated flow behind a backward-facing step under a stationary temperature disturbance
A.V. Boiko1,2, A.V. Dovgal1, and A.M. Sorokin1,3
1 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2 Tyumen State Oil-and-Gas University, Tyumen, Russia
3 Novosibirsk State University, Novosibirsk, Russia
E-mail: boiko@itam.nsc.ru, dovgal@itam.nsc.ru, am_sorokin@ngs.ru
Keywords: laminar flow separation, separation control, hydrodynamic instability, temperature perturbation
Pages: 689–700
Abstract
The flow in the separation region of laminar boundary layer behind a rectangular backward-facing step has been experimentally examined under temperature non-uniformity of the flow. The data were obtained in a subsonic wind tunnel at Reynolds numbers M << 1. The temperature disturbance was generated using a system of Peltier elements provided on the model surface upstream of the separation line. The effect of heating/cooling of the wall on the mean and fluctuating flow components was evaluated using hot-wire measurements. The experimental data were supplemented with calculations of linear-stability characteristics of model velocity profiles in the separated boundary layer. As a result, the response of the separated flow to a stationary thermal perturbation was revealed.
DOI: 10.1134/S0869864315060049
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