Measuring and testing – Volume or rate of flow – System
Patent
1975-12-11
1978-04-25
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
G01F 132
Patent
active
040856143
ABSTRACT:
A vortex-shedding flow-sensing instrument comprising a flat-faced vortex-generating plate integral with a downstream sensor-bar having flat sides set back laterally with respect to the rows of vortices shed from the edges of the vortex-generating plate. The side surfaces of the plate are tapered inwardly at a moderate angle, and extend downstream a short distance to rear surfaces at right angles with respect to the direction of fluid flow. The downstream end of the sensor bar comprises a tail piece the side surfaces of which are tapered inwardly at a moderate angle, and extend downstream a short distance to a rear surface perpendicular to the direction of fluid flow.
The sensor bar carries a liquid-filled capsule having as side walls a pair of flexible diaphragms effectively in the plane of the sensor-bar side surfaces. These diaphragms are of moderately large area so as to respond to a relatively large portion of the vortex energy. The diaphragms transmit alternating vortex pressure pulses interiorly of the capsule to a sensing element in the form of a ceramic disc having piezo-electric properties. The resulting alternating voltage signal developed by this element is coupled through lead wires to an amplifier arranged to produce a flow signal suitable for transmission over relatively long distances.
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Mair, "The Effect of a Rear Mounted Disk on the Drag of a Blunt-Based Body of Revolution" in Aeronautical Quarterly, Nov. 1965, pp. 350-360.
Curran John R.
Richardson David A.
Sgourakes George E.
Goldstein Herbert
The Foxboro Company
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