Abstract
Karman vortex velocimeter and flowmeter by use of laser diode have been developed in our laboratory 1).2). However the effects from such as shear flow, turbulent flow, channel wall and etc. are little known. In fact, the frequency of the Karman vortex in the shear flow which was measured by the method developed in our study was lower than that of the uniform flow. As a result, the value of velocity which was measured by Karman vortex velocimeter did not accord with the value of that which was measured by Pitot tube. This phenomenon have to be removed for the development of the velocimeter. To investigate these phenomena and to improve them, flow visualization was carried out.
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