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TsAGI Science Journal

ISSN Imprimir: 1948-2590
ISSN En Línea: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2011004354
pages 565-591

LAMINAR-TURBULENT TRANSITION ON THE LV6 LAMINARIZED AIRFOIL: NATURAL TRANSITION

Vadim Anatolyevich Vlasov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky str., Zhukovsky, Moscow region, 140180 Russia
Sergey Vadimovich Zhigulev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky str., Zhukovsky, Moscow region, 140180 Russia
Aleksandr Igorevich Ivanov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky str., Zhukovsky, Moscow region, 140180 Russia
Andrey Filippovich Kiselev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky str., Zhukovsky, Moscow region, 140180 Russia
Vladimir Aleksandrovich Kuzminsky
Central Aerohydrodynamic Institute (TsAGI) 1, Zhukovsky str., Zhukovsky, 140180, Moscow region, Russia
Dmitry Sergeevich Sboev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky str., Zhukovsky, Moscow region, 140180 Russia
Sergei Leonidovich Chernyshev
Central Aerohydrodynamic Institute (TsAGI), Zhukovsky, Moscow region, Russia

SINOPSIS

The laminar-turbulent transition on a non-swept wing model with the LV6 laminarized airfoil is studied under natural conditions of a test section of the T-124 subsonic wind tunnel (TsAGI) at a Reynolds number of 5.5×106. It is shown that linear packets of Tollmien−Schlichting waves are formed and developed in the laminar boundary layer; the characteristics of these packets agree well with the results predicted by the linear theory of hydrodynamic stability performed for the test conditions. A comparison of the calculated and experimental data shows that, despite its long-term operation, the T-124 wind tunnel ensures a high quality of the flow and a low level of background perturbations (i.e., conditions necessary for studying the laminar-turbulent transition). The laminar-turbulent transition on the model occurs in the zone of the boundary layer separation with its subsequent turbulent reattachment. The experimental data are compared with semi-empirical models widely used in engineering practice. The data on the beginning and end of the transition zone in the separation region are found to be in good agreement.


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