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A series of experiments were conducted to investigate the wakes of circular cylinder in shallow-water flow. Using DPIV (digital particle imaging velocimetry) system, the detailed measurement of turbulent wake around a cylinder with diameter of 1.27 m was made under the condition of many different characteristic coefficients S. The streamline figures of wake flow have been given. The measured results show that the characteristic coefficient S is the unique factor deciding the flow pattern around a cylinder in shallow water layer and the value 0.45 is the critical value of transition from vortex street to steady recirculating flow. At the same time, the mechanism of cylinder turbulent wakes in a shallow water layer is given.
A series of experiments were conducted to investigate the wakes of circular cylinder in shallow-water flow. Using DPIV (digital particle imaging velocimetry) system, the detailed measurement of turbulent wake around a cylinder with diameter of 1.27 m was made under the condition of many different characteristic coefficients S. The streamline figures of wake flow have been given. The measured results show that the characteristic coefficient S is the unique factor deciding the flow pattern around a cylinder in shallow water layer and the value 0.45 is the critical value of transition from vortex street to steady recirculating flow. At the same time, the mechanism of cylinder turbulent wakes in a shallow water layer is given.