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1. CA1183755 - NARROW PROFILE VORTEX SHEDDING BODY

Office
Canada
Application Number 425028
Application Date 31.03.1983
Publication Number 1183755
Publication Date 12.03.1985
Grant Number
Grant Date 12.03.1985
Publication Kind A
IPC
F15D 1/02
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
DFLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
1Influencing the flow of fluids
02in pipes or conduits
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
Inventors MARSH, DAVID W.
Priority Data 06365679 05.04.1982 US
Title
(EN) NARROW PROFILE VORTEX SHEDDING BODY
(FR) REDRESSEUR D'ECOULEMENT POUR MESURE DU DEBIT
Abstract
(EN) ABSTRACT OF THE DISCLOSURE 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 down- stream 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 plats, 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 down- stream 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 linaarity 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.