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Abstract <p>The results of experimental and numerical studies of subsonic turbulent flow past cylindrical cavities of various shapes in plan on the plate or on the wall of a plane–parallel channel are present. The proposed shapes of cavities are modifications of a finite-span cylindrical trench with rounded spherical end faces, known in the literature as an oval-trench dimple (OTD). The pressure coefficient distributions are obtained and the patterns of surface streamlines are visualized for modified cylindrical cavities of <i>V</i>- and drop-shaped configurations of various relative depths. A comparative estimate of the intensity of reverse separation flow in oval-trench dimples of conventional and modified shapes is given. Such a flow affects the thermal-hydraulic characteristics of the surfaces with artificial relief. A&#xa0;comparison of the experimental results and the calculation carried out within the RANS technology showed that the proposed approach can be used in search for the optimum shape of the elements of artificial reliefs of heat exchange surfaces.</p>

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Structure of Subsonic Separation Flow past Cylindrical Cavities of Various Shapes in Plan on the Wall of a Plane Channel

  • 期刊论文

  • 发表日期：

    2025年4月28日

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  • M. A. Zubin,
  • A. F. Zubkov,
  • A. Yu. Chulyunin

摘要

Abstract

The results of experimental and numerical studies of subsonic turbulent flow past cylindrical cavities of various shapes in plan on the plate or on the wall of a plane–parallel channel are present. The proposed shapes of cavities are modifications of a finite-span cylindrical trench with rounded spherical end faces, known in the literature as an oval-trench dimple (OTD). The pressure coefficient distributions are obtained and the patterns of surface streamlines are visualized for modified cylindrical cavities of V- and drop-shaped configurations of various relative depths. A comparative estimate of the intensity of reverse separation flow in oval-trench dimples of conventional and modified shapes is given. Such a flow affects the thermal-hydraulic characteristics of the surfaces with artificial relief. A comparison of the experimental results and the calculation carried out within the RANS technology showed that the proposed approach can be used in search for the optimum shape of the elements of artificial reliefs of heat exchange surfaces.