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Correlation between the abnormal enhancement of the separated flow and extraordinary pressure drops in the groove on the plate when the angle of inclination changes from 0 to 90^o

Russian version

DOI: 10.61011/TPL.2023.08.56684.19560

Isaev S. A. ^1,2, Guvernyuk S. V., Nikushchenko D. V.¹, Sudakov A. G.², Sinyavin A. A.³, Dubko E. B.²

¹State Marine Technical University, St. Petersburg, Russia
²St. Petersburg State University of Civil Aviation, St. Petersburg, Russia
³Institute of Mechanics, Lomonosov Moscow State University, Moscow, Russia

Email: isaev3612@yandex.ru

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Abstract
References
Статистика просмотров

A numerical and physical study of the air turbulent flow around a plate (with a long inclined groove of a moderate depth which has hemispherical ends) has been performed at the Reynolds number of 6.7· 10⁴ which is determined by the width of the groove. The groove inclination angle with respect to the oncoming flow varies from 0 to 90^o. The stationary near-wall flow of incompressible viscous medium was simulated by solving the Reynolds-averaged Navier-Stokes equations closed using the shear stress transport model. The static pressure distributions in single grooves were measured in a wind tunnel at the Institute of Mechanics of Moscow State University. There was determined a groove inclination angle at which the abnormal enhancement of the separated flow is observed. The resulting extraordinary pressure drops in the grooves were in a good agreement with ultrahigh absolute values of negative relative friction. Velocities of the return and secondary swirl flows turned out to be comparable with the oncoming flow velocity. Keywords: separated flow, inclined grooves, plate, abnormal enhancement, numerical simulation, wind tunnel experiment. DOI: 10.61011/TPL.2023.08.56684.19560

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