Взаимосвязь аномальной интенсификации отрывного течения и экстраординарных перепадов давления в канавке на пластине при изменении угла наклона от 0 до 90-=SUP=-o-=/SUP=-

Abstract

A numerical and physical study of the air turbulent flow around a plate (with a long inclined groove of moderate depth which has hemispherical ends) is performed at a Reynolds number of 6.7×104, which is determined by the width of the groove. The inclined angle of the groove with respect to the oncoming flow varies from 0 to 90°. The stationary near-wall flow of an incompressible viscous medium is simulated by solving the Reynolds-averaged Navier-Stokes equations, closed using the shear stress transport model. The static pressure distributions in the single grooves are measured in a wind tunnel at the Institute of Mechanics of Moscow State University. Inclined angles of the grooves are determined, at which an anomalous intensification of the separated flow is observed. The resulting extraordinary pressure drops in the grooves are in a good agreement with ultra-high absolute values of negative relative friction. Velocities of the return and secondary swirling flow turn out to be comparable with the oncoming flow velocity.