Vortex flowmeter with torsional vortex sensor

Details Vortex flowmeter with torsional vortex sensor Vortex flowmeter with torsional vortex sensor

1990-12-24

1992-02-25

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

050902512

ABSTRACT:
A vortex shedding flowmeter includes a vortex generating bluff body of elongated cylindrical shape disposed across a flow passage, a vortex sensing planar member with an off-set leading edge disposed downstream of the vortex generating bluff body and supported by the flowmeter body in a pivotable arrangement about a pivot axis parallel to the vortex sensing planar member and perpendicular to the central axis of the flow passage, wherein the off-set distance between the leading edges of two sections of the planar member is generally equal to one half or an integer plus one half times the wave length of the sinuating streamlines created by the vortices shed from the vortex generating bluff body, and at least one transducer converting alternating torque experienced by the vortex sensing planar member to an alternating electrical signal, wherein the fluid velocity is determined from the frequency of the alternating electrical signal and the mass flow rate of the fluid is determined from a combination of the frequency and the amplitude of the alternating electrical signal.

REFERENCES:
patent: 4727756 (1988-03-01), Lew
patent: 4986134 (1991-01-01), Lew

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