Abstract
A separated flow in a narrow channel with a conical dimple at the wall with an incline angle of θ is calculated based on the solution to the unsteady Reynolds-averaged Navier–Stokes equations (URANS) closed using the modified shear stress transport (SST) model. It is noted that a sharp transition from the periodic mode with two alternately changing vortices in dimples close to cylindrical shape (θ = 10°–22.5°) to modes with periodic low-frequency vibrations of inclined single-vortex structures at moderate angles θ (30°–37.5°) and to modes with steady vortex structures at angles θ larger than 45° is observed. The relative hydraulic losses at the channel segment with the dimple remain at a level of 1.23–1.24 as θ increases to θ = 45° and, then, rapidly decrease by almost 1.5 times to 1.16 at θ = 60°.
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Funding
This work was supported by the Russian Science Foundation, project no. 19-19-00259.
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Translated by E. Oborin
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Isaev, S.A., Nikushchenko, D.V., Sudakov, A.G. et al. Transformation of a Separated Turbulent Flow in a Conical Dimple at the Wall of a Narrow Channel and Reduction in Hydraulic Losses as Conicity Increases. Tech. Phys. Lett. 47, 557–560 (2021). https://doi.org/10.1134/S1063785021060092
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DOI: https://doi.org/10.1134/S1063785021060092