This article is cited in 3 papers

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$^\circ$

S. A. Isaev^ab, S. V. Guvernyuk^c, D. V. Nikushchenko^a, A. G. Sudakov^b, A. A. Sinyavin^c, E. B. Dubko<sup>b

a</sup> State Marine Technical University of St. Petersburg, St. Petersburg, Russia
^b Saint-Petersburg State University of Civil Aviation, St. Petersburg, Russia
^c Lomonosov Moscow State University, Institute of Mechanics, Moscow, Russia

Abstract: 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 $\cdot$ 10$^4$ which is determined by the width of the groove. The groove inclination angle with respect to the oncoming flow varies from 0 to 90$^\circ$. 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.

Received: 17.03.2023
Revised: 10.05.2023
Accepted: 05.06.2023

DOI: 10.21883/PJTF.2023.15.55863.19560

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