Insights into Vortex Shedding with Data Analysis

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概要

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• Unsteady, three-dimensional characteristics of vortex shedding were studied with self-made MEMS sensors situated spanwisely on a circular cylinder subjected to uniform incoming flow. Firstly, verification on the reliability of the MEMS sensor signals was made by comparing with the hot-wire signals obtained in the flow simultaneously. Subsequently, the MEMS sensor signals were analyzed with Wavelet and Hilbert transformations and 2D-FFT. By Wavelet and Hilbert transformations, the results obtained indicate that the strongly three-dimensional vortex shedding events are featured with pronounced spanwise variations in the instantaneous phases of vortex shedding, which are further identified as the occurrences of vortex dislocation. Furthermore, the results of 2D-FFT analysis reveal that the spanwise wave numbers of vortex shedding largely falls in a range between -2 to 2, for the MEMS sensors spanned over a spanwise region of 3 D in length.

• 一般社団法人 日本機械学会の論文

著者

• Miau Jiun-jih

  Department Of Aeronautics And Astronautics National Cheng Kung University

• TU J.

  Department of Aeronautics and Astronautics, National Cheng Kung University

• LIAO T.

  Department of Aeronautics and Astronautics, National Cheng Kung University

関連論文

• On the hysteresis of vortex shedding in a periodically-varying flow
• Insights into Vortex Shedding with Data Analysis
• ISEM2008 Summary Report

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