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김상일(Sangil Kim),승삼선(Samsun Sueng),이승철(Seung-Chul Lee),김효준(Hyojun Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
This study is on the nonlinear interaction between two different vortex shedding frequencies from the cylinder having two diameters. In particular, two different vortex shedding frequencies are made by making the cylinder having two diameters artificially. And the flow velocity fluctuations behind the cylinder are measured three dimensionally. Also, we made a hole of pressure transducer for measuring the pressure on the cylinder surface and measured the pressure of cylinder surface. The pressure signal from the pressure transducer is used as basic signal. The TSC is used for checking the strength of nonlinear interaction between two different vortex shedding frequencies. As a result, it is clarified that; I) frequency distribution behind the cylinder. ii) three dimensional flow state behind the cylinder by calculation of ensemble average. iii) a close connection between the vertical vortex and change of low frequency by nonlinear interaction between two different vortex shedding frequencies from the cylinder having two diameters.