6. Physics of a Fluid, Neutral and Ionized Gases

DEVELOPMENT OF THE WAVE PACKETS-FORERUNNERS AT THE STRAIGHT WING BOUNDARY LAYER

Mikhail M. Katasonov
1. Khristianovich Institute of Theoretical and Applied Mechanics SB RAS Novosibirsk, Russian Federation
2. Novosibirsk State University Novosibirsk, Russian Federation
mikhail@itam.nsc.ru
Pavel А. Мotyrev
1. Novosibirsk State University Novosibirsk, Russian Federation
Dmitriy S. Sboev
1. Novosibirsk State University Novosibirsk, Russian Federation
2. Central Aerohydrodynamic Institute Zhukovsky Russia
The material was received by the Editorial Board: 12.12.2011
This work is devoted to the study of wave packets (forerunners) formed in straight wing boundary layers in the regions preceding a drastic change in the flow velocity inside the boundary layer, near the fronts of streaks. The investigations were carried out in the subsonic low turbulence wind tunnel. Measurements of the flow fields were carried out using a single-wire probe of a constant-temperature hot-wire anemometer. It was shown that the localized structures, which modeled artificially from incoming flow, generate streaks in a boundary layer. The wave packets (forerunners) are appears in the regions preceding a drastic change of flow velocity inside the boundary layer at the streaks fronts. The characteristics of the forerunners, affected by the external-flow pressure gradient, intensity of streak, and local velocity gradients near the front of the streak were investigated.

Keywords:
boundary layer, laminar-turbulent transition, streaky structures, wave packet.
УДК 532.526

DEVELOPMENT OF THE WAVE PACKETS-FORERUNNERS AT THE STRAIGHT WING BOUNDARY LAYER
References: Katasonov М. М., Мotyrev P. А., Sboev D. S., Кozlov V. V., Evers Q. B. DEVELOPMENT OF THE WAVE PACKETS-FORERUNNERS AT THE STRAIGHT WING BOUNDARY LAYER. Vestnik NSU. Series: Physics. 2012, vol. 7, no. 1. P. 28–37 (in Russ.). DOI: 10.54362/1818-7919-2012-7-1-28-37