Karman vortex type flow measuring apparatus

Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy

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G01F 132

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active

044322410

ABSTRACT:
A Karman vortex type flow measuring apparatus comprises a duct (1) for a fluid whose flow rate or flow velocity is to be measured, and a columnar vortex shedding member (2) extending within the duct transversely of the fluid flow direction. The fluid flow near the vortex shedding member has a width (X) of which the ratio (X/D) to the width (D) of the vortex shedding member lies within the range between 3 and 4. A highly accurate measurement can be achieved independently of the cross-sectional configuration of the duct and for a wide range of the fluid flow rate or flow velocity.

REFERENCES:
patent: 3810388 (1974-05-01), Cousins
Tsuchiya et al., "Current Meters Utilizing Karmen Vortex Streets Report #1-Basic Experiments in Open Waterway", in Proc. Japan Soc. Mec. Eng., No. 167, 1967, pp. 97-100.
Morkovin, "Flow Around Circular Cylinder-A Kaleidoscope of Challenging Fluid Phenomena", in Symposium on Fully Separated Flows, May 1964.

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