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1. US4457181 - Narrow profile vortex shedding body

Office
United States of America
Application Number 06365679
Application Date 05.04.1982
Publication Number 4457181
Publication Date 03.07.1984
Grant Number 4457181
Grant Date 03.07.1984
Publication Kind A
IPC
G01F 1/32
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05by using mechanical effects
20by detection of dynamic effects of the fluid flow
32by swirl flowmeter, e.g. using Karman vortices
CPC
G01F 1/3218
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
05by using mechanical effects
20by detection of dynamic effects of the fluid flow
32by swirl flowmeter, e.g. using Karman vortices
3209using Karman vortices
3218bluff body design
Applicants The Foxboro Company
Inventors Marsh David W.
Agents Paglierani Ronald J.
Title
(EN) Narrow profile vortex shedding body
Abstract
(EN)

A body for improved shedding of vortices within a flowing fluid has a very short downstream length, e.g. 1/8 inch, yet is capable of excellent flow metering performance. The body includes an upstream elongate thin plate spanning the inner diameter of a conduit, and one or more sections projecting downstream of the plate. Generally, these sections are in the form of cylindrical rods having circular, rectangular, or oval cross-sections, with their longitudinal axes parallel to the longitudinal axis of the plate. Although these sections may be separated from the plate, in certain embodiments they are rigidly attached to the downstream side thereof. By simultaneously maintaining the ratio of the width (i.e., transverse to the flow direction) of the thin plate to the overall width of the downstream sections within the range from 1.0 to 2.2, and the ratio of the width of the thin plate to the diameter of the conduit within the range from 0.1 to 0.3, enhanced linearity of signal is achieved without the need for any appreciable downstream length. This results in a narrow profile flowmeter assembly which occupies the same amount of space as a conventional orifice plate. An ultrasonic detector and associated circuitry, or similar detecting scheme, sense the periodic passage of the vortices through the fluid and relate its periodicity to the rate of flow.