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      Influence of inflow directions and setting angle of inlet guide vane on hydraulic performance of an axial-flow pump

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          Abstract

          Inlet flow direction significantly affects the hydraulic performance of an axial-flow pump. Usually, the research papers ignore this phenomenon, resulting in discrepancies between simulation and experimental results. This study examines the influence of inflow direction in five cases (0%, 5%, 10%, 15%, and 30% pre-swirl intensities) to determine the relationship between the pre-swirl intensity and the hydraulic performance of the axial-flow pump. Based on this, changing the setting angle of the inlet guide vane (IGV) is proposed and thoroughly investigated to reduce the effect of inflow direction. In this study, the influence of clearances in IGV blades on hydraulic performance is also investigated in detail. Numerical simulations are performed using ANSYS–CFX and a shear stress transport reattachment modification (SST k- \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\omega$$\end{document} ) turbulence model with small y+ values at all walls. Specifically, the hydraulic performance curves and internal flow characteristics, including contours and streamlines, are assessed and analyzed. The inflow direction significantly impacts the hydraulic efficiency of the axial-flow pump. Increased pre-swirl intensity causes more loss in the IGV passage. The internal flow field and performance are not affected by the clearance at the hub and shroud of the IGV. However, the tip clearance of the impeller causes a decrease in hydraulic efficiency due to the tip leakage vortex. By adjusting the setting angle of the IGV, the efficiency and head gradually increase from a negative to a positive setting angle. Additionally, 30° is considered the critical setting angle for IGV.

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          Two-equation eddy-viscosity turbulence models for engineering applications

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            Procedure for Estimation and Reporting of Uncertainty Due to Discretization in CFD Applications

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              Influence of tip clearance on pressure fluctuations in an axial flow pump

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                Author and article information

                Contributors
                jinhyuk@kitech.re.kr
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                1 March 2023
                1 March 2023
                2023
                : 13
                : 3468
                Affiliations
                [1 ]GRID grid.412786.e, ISNI 0000 0004 1791 8264, Convergence Manufacturing System Engineering (Green Process and Energy System Engineering), , University of Science & Technology, ; Daejeon, 34113 South Korea
                [2 ]GRID grid.454135.2, ISNI 0000 0000 9353 1134, Carbon Neutral Technology R&D Department, , Korea Institute of Industrial Technology, ; Cheonan, 31056 South Korea
                Article
                30511
                10.1038/s41598-023-30511-4
                9977862
                36859554
                a2e14c26-ea67-4af5-8f6d-291a9f1a77d5
                © The Author(s) 2023

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 18 December 2022
                : 24 February 2023
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100007053, Korea Institute of Energy Technology Evaluation and Planning;
                Award ID: 2021202080026A
                Award Recipient :
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                © The Author(s) 2023

                Uncategorized
                engineering,mechanical engineering
                Uncategorized
                engineering, mechanical engineering

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