PIV measurements in a turbulent wall jet over a backward-facing step in a three-dimensional,non-confined channel |
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| Affiliation: | 1. Université Lille Nord de France, F-59000 Lille, France;2. UVHC, TEMPO, F-59313 Valenciennes, France;1. DICeM, Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio 43, 03043 Cassino, Italy;2. Palmer, Scientific and Technological Park of Southern Lazio, Via Carrara 12/A, 04100 Latina, Italy;1. Department of Mining and Nuclear Engineering, Missouri University of Science and Technology, Fulton Hall, 310 W. 14th Street, Rolla, MO 65409, USA;2. Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, 110 Bertelsmeyer Hall, 1101 N. State Street, Rolla, MO 65409, USA;3. Leading Edge Non Destructive Testing Technology (LENDT) Group, Industrial Technology Division, Malaysian Nuclear Agency, Bangi, 43000, Kajang, Selangor D.E., Malaysia;1. Department of Chemical Engineering, University of Guanajuato, DCNE, Col. Norial Alta s/n, C.P. 36050 Guanajuato, Gto., Mexico;2. Department of Metal-Mechanical, Technological University of Guanajuato Southwest, Valle-Huanimaro km. 1.2, Valle de Santiago, Gto., Mexico;3. Interdisciplinary Professional Unit of Engineering Campus Guanajuato, National Institute Polytechnic, Av. Mineral de Valenciana 200 Fracc, Industrial Puerto Interior, Silao de la Victoria, Mexico;4. Department of Mechanical Engineering, Engineering Division, Campus Irapuato-Salamanca, University of Guanajuato, Salamanca, Gto., Mexico;1. Faculty of Electrical Engineering, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina;2. Institute of metrology of Bosnia and Herzegovina, 71000 Sarajevo, Bosnia and Herzegovina;1. R&D Department, MAPNA Turbine Engineering and Manufacturing Company, Tehran, I.R.Iran;2. Technical and Engineering College, Islamic Azad University, Karaj Branch, Tehran, I.R.Iran |
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| Abstract: | A study of a turbulent wall jet over a backward-facing step is especially of interest because it shows a rich phenomenon flow and a mechanism to alter the flow characteristics downstream of the step. However, studies on this flow configuration are rare. In this paper, we considered this flow configuration in a non-confined channel as the specific engineering applications of electrical rotating machines and alternator that can be found in modern wind generators of the power production industry and automobile engines. The turbulent wall jet over a backward-facing step in a non-confined wind tunnel had the jet Reynolds number of 24,100 and the step Reynolds number of 11,900. Particle image velocity (PIV) and stereoscopic PIV measurements were performed along the central plane and several cross-stream planes. Numerical simulation of the test configuration was conducted by solving the three-dimensional Reynolds Averaged Navier–Stokes (RANS) equations with the second-order closure Reynolds stress model (RSM). The mean flow fields and second-order statistical moments from the RSM simulation were compared to results that were obtained through the PIV and stereo-PIV experiments. The mean reattachment length obtained from the current configuration was much shorter than those from the backward-facing step in the plane channel. The stereo-PIV measurements in the cross-stream planes revealed a high three-dimensionality of the flow, a high population of streamwise vortice in the upper region, near the side walls and the corners formed by the side walls and the bottom wall. The obtained results also confirmed the presence of the wall-jet formation on the bottom wall. |
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| Keywords: | Wall jet Backward-facing step PIV RANS |
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