4.6 Article

Unsteady analysis of jet impingement under vibration conditions

期刊

CHINESE JOURNAL OF AERONAUTICS
卷 35, 期 5, 页码 291-308

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cja.2021.09.004

关键词

Impinging jet; Proper orthogonal decom-position; Self-Adaptive Turbulence Eddy Simulation (SATES); Unsteady turbulent convec-tion; Vibration

资金

  1. National Major Science and Technology Projects of China [2017-III-0010-0036]
  2. Jiangsu Specially Appointed Professor Program of China

向作者/读者索取更多资源

In this study, a high-resolution simulation was conducted to investigate the unsteady turbulent convection of jet impingement under vibration conditions. It was found that the introduction of vibration promoted the development of primary vortices and had an impact on the heat transfer performance.
The vibration of thermodynamic machinery will affect its cooling system. In this research, a high-resolution simulation of jet impingement was performed to quantify the unsteady turbulent convection under vibration conditions. A newly developed Self-Adaptive Turbulence Eddy Simulation (SATES) method was used. The Reynolds number was Re = 23000, the jet-towall distance was fixed at H/D = 2, and the vibrating frequency of the impinging wall f varied from 0 to 200 Hz. Compared with the static wall case, the maximum enhancement of the stagnation point and area averaged Nusselt number within r/D = 1 could reach up to 5% due to the larger primary vortices, whereas it could reduce the heat transfer by 10% beyond r/D = 3 due to the suppression of the wall vortices development. Based on the unsteady analysis and Proper Orthogonal Decomposition (POD) pattern, the modes controlled by vibration were recognized and their contributions to the heat transfer performance were also evaluated. The introduction of the vibration promoted the development of the primary vortices and changed the radial alternating motion to a vertical alternating motion at the wall jet region. The former was beneficial for the heat transfer, while the latter was unfavorable. (c) 2021 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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