Vortex flow sensor with a turbulence grid

Details Vortex flow sensor with a turbulence grid Vortex flow sensor with a turbulence grid

1997-08-08

1999-07-13

Patel, Harshad

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

138 37, G01F 132, F15D 5500

Patent

active

059229705

ABSTRACT:
This vortex flow sensor (1) for measuring the flow velocity and/or the volumetric flow rate of a fluid flowing in a measuring tube (2) has an improved measurement accuracy according to the following design: A bluff body (4) is mounted in the measuring tube and designed to generate Karman vortices; a vortex-sensing element (5) is responsive to vortex-induced pressure fluctuations; and a turbulence grid (6) is mounted upstream of the bluff body and has openings with at least partially differing cross sections. The turbulence grid cn be circular and formed by radial members and spaced-apart concentric circular members. The turbulence grid can have a thickness D in the direction of flow and be located at a distance x from the bluff body, said thickness and said distance satisfying the inequality: 20D<x<40D.

REFERENCES:
patent: 3572391 (1971-03-01), Hirsch
patent: 3840051 (1974-10-01), Akashi et al.
patent: 3856049 (1974-12-01), Scull
patent: 3965730 (1976-06-01), Innes
patent: 4280360 (1981-07-01), Kobayashi et al.
patent: 4397192 (1983-08-01), Mollet
patent: 5193399 (1993-03-01), Kumano et al.

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