Influence of blowing a jet from a thin tube on the generation of a tornado-like vortex and the intensification of a developing swirling turbulent flow in an inclined groove on a channel wall

S. A. Isaev^ab, D. V. Nikushchenko^a, L. S. Yanovskii^c, A. Yu. Chulyunin<sup>d

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

Abstract: A numerical study of the effect of blowing a jet from a thin air tube on the vortex motion in an inclined groove on the wall of a plane-parallel channel is performed using StarCCM$^+$ calculation codes. It is shown that in the range of change in the flow rate in the jet from 0 to 0.1% in fractions of the air flow rate in the channel, the blowing of the jet does not affect the self-organized tornado-like vortex in the inlet part of the groove. With an increase in the relative flow rate, the outflowing trickle is gradually drawn in, and, starting from 0.08%, it is completely captured by a helical vortex emerging from the central part of the groove with an inclination angle of 45$^\circ$. In this case, the swirling flow in the tail part of the groove is intensified due to the resulting pressure drop between the zones of stagnation on the windward slope and rarefaction at the bottom of the groove.

Keywords: separated flow, jet, groove, plane-parallel channel, intensification, numerical simulation.

DOI: 10.21883/PJTF.2023.18.56174.19660

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