US3902367A - Flowmeters - Google Patents

Flowmeters Download PDF

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Publication number
US3902367A
US3902367A US456267A US45626774A US3902367A US 3902367 A US3902367 A US 3902367A US 456267 A US456267 A US 456267A US 45626774 A US45626774 A US 45626774A US 3902367 A US3902367 A US 3902367A
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United States
Prior art keywords
oscillator
feedback loops
fluid
flow
junctions
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Expired - Lifetime
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US456267A
Inventor
John Grant
Andrew John Cox
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UK Atomic Energy Authority
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UK Atomic Energy Authority
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Publication of US3902367A publication Critical patent/US3902367A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/3227—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters using fluidic oscillators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/2224—Structure of body of device

Definitions

  • a fluid flowmeter which includes a fluidic oscillator with feedback loops from its side walls to its control nozzles. At the junctions between the feedback loops and the side walls of the oscillator the feedback loops are arranged at an angle such that they do not face into the direction of flow of the fluid stream through the oscillator.
  • This invention relates to flowmeters of the kind using a fluidic oscillator, that is a device which produces oscillations when it is energised by a flow of fluid.
  • a fluidic oscillator has an interaction chamber with a main fluid inlet nozzle, diverging side walls to which a fluid stream issuing from the nozzle can attach (attachment walls) and control nozzles for exerting fluid pressure on the fluid stream and thereby directing the stream from one side wall to the other; a splitter may be provided to physically divide the flow. Feedback loops may be provided from the diverging side walls to the control nozzles.
  • the purpose of these feedback loops is to create at the control nozzles fluid pressures which will effect switching of the fluid stream between the side walls and for use in a flowmeter (where the oscillations are desired to be proportional to the flow rate) the geometry of the oscillator is such that fluid flow through the control nozzles is established by bulk flow of the fluid in the feedback loops rather than by fluid wave effects.
  • the momentum of the fluid stream has been used to create in the feedback loops fluid pressures responsive to the dynamic pressure of the fluid stream and the junctions between the side walls and the feedback loops have been made at an appropriate angle to bring this about, that is at an angle such that the feedback loops face into the direction of flow of the fluid stream at the junctions.
  • a fluid flow meter includes a fluidic oscillator with feedback loops from its side walls to its control nozzles and the feedback loops at the junctions with the side walls are either at right angles to the side walls or at an angle such that the feeback loops face away from the direction of flow of the fluid stream through the oscillator.
  • fluid pressure in the feed back loops is made responsive only to the static pressure of the flulid stream and it has been found that this can lead to a better signal wave shape from the oscillator and improve the linearity of a flowmeter.
  • the position of the feedback loop junctions with the side walls is determined with reference to the static pressure profiles down the side walls of the oscillator. It has become customary in previous oscillators to provide restrictions downstream of the feedback loop junctions and the size and location of such restrictions may be chosen to optimize the static pressure profiles in the present oscillator.
  • the linearity of a flowmeter in accordance with the invention and the strength and shape of its oscillations depend on these profiles. Re strictions may however not be necessary.
  • FIG. 1 is an isometric view and FIG. 2 is a plan view.
  • FIG. 1 shows a fluidic oscillator, with cover plate removed having an interaction chamber 1, a main fluid inlet nozzle 2, diverging side walls 3 and control nozzles 4.
  • a splitter body 5 is provided to physically divide the flow from the interaction chamber 1.
  • Feedback loops 6 are provided from the diverging side walls 3 to the control nozzles 4.
  • the loops face away from the direction of flow of fluid through the oscillator.
  • Restrictions 8 are provided downstream of the junctions 7.
  • a fluid oscillator in accordance with the invention may be used in a flowmeter in the ordinary way by measuring the frequency of oscillation (see, for example, US. Pat. No. 3,690,171 Mass flow may be determined if both amplitude and frequency of oscillation are measured and integrated in the manner of copending German Pat. application P23 14 163.1, opened to public inspection Oct. 4, 1973 and corresponding to copending US. Pat. application 341,080 filed Mar. 14, 1973.
  • a fluid flow meter including a fluidic oscillator with means for measuring the frequency of oscillation, the oscillator including feedback loops from its attachment walls to its control nozzles, in which oscillations are dependent on bulk flow through the feedback loops rather than by fluid wave effects, the improvement such that at the junctions between the feedback loops and the attachment walls the feed back loops are at right angles or less to the upstream portions of the attachment walls.

Abstract

A fluid flowmeter which includes a fluidic oscillator with feedback loops from its side walls to its control nozzles. At the junctions between the feedback loops and the side walls of the oscillator the feedback loops are arranged at an angle such that they do not face into the direction of flow of the fluid stream through the oscillator.

Description

United States Patent [1 1 Grant et al.
[4 1 Sept. 2, 1975 [22] Filed:
[ FLOWMETERS [75] Inventors: John Grant; Andrew John Cox, both of Warrington, England [73] Assignee: United Kingdom Atomic Energy Authority, London, England Mar. 29, 1974 [21] Appl. No.: 456,267
[30] Foreign Application Priority Data Apr. 5, 1973 United Kingdom 16435/73 [52] US. Cl. 73/194 B; 137/835 [51] Int. Cl. GOIF l/20 [58] Field of Search 73/194 B; 137/835 [56] References Cited UNITED STATES PATENTS 3,273,377 9/1966 Testerman et al. 73/23.l
3,373,600 3/1968 Taplin 137/835 3,599,653 10/1971 Clayton 137/835 3,614,964 10/1971 Chen 137/835 FOREIGN PATENTS OR APPLICATIONS 1,225,570 3/1971 United Kingdom 73/194 B Primary Examiner-Herbert Goldstein Attorney, Agent, or Firm-Larson, Taylor & Hinds ABSTRACT A fluid flowmeter which includes a fluidic oscillator with feedback loops from its side walls to its control nozzles. At the junctions between the feedback loops and the side walls of the oscillator the feedback loops are arranged at an angle such that they do not face into the direction of flow of the fluid stream through the oscillator.
2 Claims, 2 Drawing Figures FLOWMETERS BACKGROUND OF THE INVENTION This invention relates to flowmeters of the kind using a fluidic oscillator, that is a device which produces oscillations when it is energised by a flow of fluid.
Essentially a fluidic oscillator has an interaction chamber with a main fluid inlet nozzle, diverging side walls to which a fluid stream issuing from the nozzle can attach (attachment walls) and control nozzles for exerting fluid pressure on the fluid stream and thereby directing the stream from one side wall to the other; a splitter may be provided to physically divide the flow. Feedback loops may be provided from the diverging side walls to the control nozzles. The purpose of these feedback loops is to create at the control nozzles fluid pressures which will effect switching of the fluid stream between the side walls and for use in a flowmeter (where the oscillations are desired to be proportional to the flow rate) the geometry of the oscillator is such that fluid flow through the control nozzles is established by bulk flow of the fluid in the feedback loops rather than by fluid wave effects. Previously the momentum of the fluid stream has been used to create in the feedback loops fluid pressures responsive to the dynamic pressure of the fluid stream and the junctions between the side walls and the feedback loops have been made at an appropriate angle to bring this about, that is at an angle such that the feedback loops face into the direction of flow of the fluid stream at the junctions.
SUMMARY OF THE INVENTION According to the present invention a fluid flow meter includes a fluidic oscillator with feedback loops from its side walls to its control nozzles and the feedback loops at the junctions with the side walls are either at right angles to the side walls or at an angle such that the feeback loops face away from the direction of flow of the fluid stream through the oscillator.
By means of the invention fluid pressure in the feed back loops is made responsive only to the static pressure of the flulid stream and it has been found that this can lead to a better signal wave shape from the oscillator and improve the linearity of a flowmeter.
The position of the feedback loop junctions with the side walls is determined with reference to the static pressure profiles down the side walls of the oscillator. It has become customary in previous oscillators to provide restrictions downstream of the feedback loop junctions and the size and location of such restrictions may be chosen to optimize the static pressure profiles in the present oscillator. The linearity of a flowmeter in accordance with the invention and the strength and shape of its oscillations depend on these profiles. Re strictions may however not be necessary.
DESCRIPTION OF THE DRAWINGS By way of example a fluidic oscillator in accordance with the invention will now be described with reference to the accompanying drawings wherein FIG. 1 is an isometric view and FIG. 2 is a plan view.
DESCRIPTION OF A PREFERRED EMBODIMENT The drawings show a fluidic oscillator, with cover plate removed having an interaction chamber 1, a main fluid inlet nozzle 2, diverging side walls 3 and control nozzles 4. A splitter body 5 is provided to physically divide the flow from the interaction chamber 1. Feedback loops 6 are provided from the diverging side walls 3 to the control nozzles 4. At the junctions 7 between feed back loops 6 and the side walls (attachment walls) 3 the loops face away from the direction of flow of fluid through the oscillator. Restrictions 8 are provided downstream of the junctions 7.
A fluid oscillator in accordance with the invention may be used in a flowmeter in the ordinary way by measuring the frequency of oscillation (see, for example, US. Pat. No. 3,690,171 Mass flow may be determined if both amplitude and frequency of oscillation are measured and integrated in the manner of copending German Pat. application P23 14 163.1, opened to public inspection Oct. 4, 1973 and corresponding to copending US. Pat. application 341,080 filed Mar. 14, 1973.
We claim:
1. In a fluid flow meter including a fluidic oscillator with means for measuring the frequency of oscillation, the oscillator including feedback loops from its attachment walls to its control nozzles, in which oscillations are dependent on bulk flow through the feedback loops rather than by fluid wave effects, the improvement such that at the junctions between the feedback loops and the attachment walls the feed back loops are at right angles or less to the upstream portions of the attachment walls.
2. Apparatus as claimed in claim 1 wherein at said junctions said feedback loops face away from the direction of flow of the fluid stream through the oscillator.
l= l =l

Claims (2)

1. In a fluid flow meter including a fluidic oscillator with means for measuring the frequency of oscillation, the oscillator including feedback loops from its attachment walls to its control nozzles, in which oscillations are dependent on bulk flow through the feedback loops rather than by fluid wave effects, the improvement such that at the junctions between the feedback loops and the attachment walls the feed back loops are at right angles or less to the upstream portions of the attachment walls.
2. Apparatus as claimed in claim 1 wherein at said junctions said feedback loops face away from the direction of flow of the fluid stream through the oscillator.
US456267A 1973-04-05 1974-03-29 Flowmeters Expired - Lifetime US3902367A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1643573A GB1453587A (en) 1973-04-05 1973-04-05 Flowmeters

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US3902367A true US3902367A (en) 1975-09-02

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US456267A Expired - Lifetime US3902367A (en) 1973-04-05 1974-03-29 Flowmeters

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US (1) US3902367A (en)
JP (1) JPS5724848B2 (en)
DE (1) DE2414970C2 (en)
FR (1) FR2224743B1 (en)
GB (1) GB1453587A (en)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4085615A (en) * 1976-11-22 1978-04-25 General Electric Company Linear flowmeter
US4107990A (en) * 1976-11-02 1978-08-22 General Electric Company Fluidic flow and velocity sensor
US4610162A (en) * 1984-06-27 1986-09-09 Osaka Gas Company Fluidic flowmeter
EP0251627A1 (en) * 1986-06-27 1988-01-07 THORN EMI Flow Measurement Limited Improvements in or relating to flowmeters
WO1989005441A1 (en) * 1987-12-04 1989-06-15 Societe Industrielle De Sonceboz S.A. Fluidic flowmeter
US4854176A (en) * 1987-06-16 1989-08-08 Osaka Gas Co., Ltd. Fluidic flowmeter
US4911007A (en) * 1987-06-19 1990-03-27 British Gas Plc Flowmeter
US5406840A (en) * 1991-03-18 1995-04-18 British Gas Plc Supplying fluid
US20040112266A1 (en) * 2002-11-20 2004-06-17 Yoav Rosen Twin hull personal watercraft
US6976507B1 (en) * 2005-02-08 2005-12-20 Halliburton Energy Services, Inc. Apparatus for creating pulsating fluid flow
US20080115849A1 (en) * 2006-11-22 2008-05-22 Jing-Tang Yang Micro-fluidic oscillator
US20110083516A1 (en) * 2008-06-10 2011-04-14 Avinash Shrikrishna Vaidya Recirculation type oscillator flow meter
US20110094308A1 (en) * 2008-06-10 2011-04-28 Avinash Shrikrishna Vaidya Fluidic oscillator flow meter
US20110214762A1 (en) * 2008-09-12 2011-09-08 Elster Metering Limited Bi-directional fluidic oscillator flow meter
DE102016120454A1 (en) 2016-10-26 2018-04-26 Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) Method and device for examining a sample
US10646886B2 (en) 2015-06-08 2020-05-12 Fdx Fluid Dynamix Gmbh Fluidic oscillator and applications of the fluidic oscillator
US20220280963A1 (en) * 2021-03-04 2022-09-08 Stratec Se Sensor for determining the oscillating frequency in a fluidic oscillating nozzle and a method using the sensor
US11471898B2 (en) 2015-11-18 2022-10-18 Fdx Fluid Dynamix Gmbh Fluidic component
RU2816742C1 (en) * 2023-03-17 2024-04-03 Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук Annular jet oscillator

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1593680A (en) * 1976-11-02 1981-07-22 Gen Electric Fluidic flowmeters
SE407461B (en) * 1977-08-19 1979-03-26 Wennberg Lennart A FLUIDISTOROSCILLATOR TYPES
JPS5766313A (en) * 1980-10-09 1982-04-22 Tokyo Gas Co Ltd Method and device of target sensing type for sensing vibration of fluid
JPS58189518A (en) * 1982-01-07 1983-11-05 ニユ−ジ−ランド・ガバメント・プロパテイ・コ−ポレ−シヨン Mass flowmeter
JPS58213117A (en) * 1982-06-04 1983-12-12 Matsushita Electric Ind Co Ltd Controller for burner
GB2447425A (en) * 2007-03-13 2008-09-17 Univ Cranfield Bidirectional flowmeter with two fluidic oscillators arranged in series

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273377A (en) * 1963-08-12 1966-09-20 Phillips Petroleum Co Fluid oscillator analyzer and method
US3373600A (en) * 1964-02-20 1968-03-19 Bendix Corp Method for determining fluid characteristics utilizing fluid stream oscillating devices
US3599653A (en) * 1969-09-30 1971-08-17 Us Army Negative feedback fluidic oscillator
US3614964A (en) * 1969-09-16 1971-10-26 Sperry Rand Corp Clock pulse generating system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640133A (en) * 1967-02-24 1972-02-08 Moore Products Co Flowmeter
GB1297154A (en) * 1969-10-29 1972-11-22

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3273377A (en) * 1963-08-12 1966-09-20 Phillips Petroleum Co Fluid oscillator analyzer and method
US3373600A (en) * 1964-02-20 1968-03-19 Bendix Corp Method for determining fluid characteristics utilizing fluid stream oscillating devices
US3614964A (en) * 1969-09-16 1971-10-26 Sperry Rand Corp Clock pulse generating system
US3599653A (en) * 1969-09-30 1971-08-17 Us Army Negative feedback fluidic oscillator

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107990A (en) * 1976-11-02 1978-08-22 General Electric Company Fluidic flow and velocity sensor
US4085615A (en) * 1976-11-22 1978-04-25 General Electric Company Linear flowmeter
US4610162A (en) * 1984-06-27 1986-09-09 Osaka Gas Company Fluidic flowmeter
EP0251627A1 (en) * 1986-06-27 1988-01-07 THORN EMI Flow Measurement Limited Improvements in or relating to flowmeters
US4854176A (en) * 1987-06-16 1989-08-08 Osaka Gas Co., Ltd. Fluidic flowmeter
US4911007A (en) * 1987-06-19 1990-03-27 British Gas Plc Flowmeter
WO1989005441A1 (en) * 1987-12-04 1989-06-15 Societe Industrielle De Sonceboz S.A. Fluidic flowmeter
US5406840A (en) * 1991-03-18 1995-04-18 British Gas Plc Supplying fluid
US20040112266A1 (en) * 2002-11-20 2004-06-17 Yoav Rosen Twin hull personal watercraft
US6976507B1 (en) * 2005-02-08 2005-12-20 Halliburton Energy Services, Inc. Apparatus for creating pulsating fluid flow
US20080115849A1 (en) * 2006-11-22 2008-05-22 Jing-Tang Yang Micro-fluidic oscillator
US7481119B2 (en) 2006-11-22 2009-01-27 National Tsing Hua University Micro-fluidic oscillator having a sudden expansion region at the nozzle outlet
US20110083516A1 (en) * 2008-06-10 2011-04-14 Avinash Shrikrishna Vaidya Recirculation type oscillator flow meter
US20110094308A1 (en) * 2008-06-10 2011-04-28 Avinash Shrikrishna Vaidya Fluidic oscillator flow meter
US8091434B2 (en) 2008-06-10 2012-01-10 Avinash Shrikrishna Vaidya Fluidic oscillator flow meter
US8201462B2 (en) 2008-06-10 2012-06-19 Avinash Shrikrishna Vaidya Recirculation type oscillator flow meter
US20110214762A1 (en) * 2008-09-12 2011-09-08 Elster Metering Limited Bi-directional fluidic oscillator flow meter
US9134152B2 (en) * 2008-09-12 2015-09-15 Elster Metering Limited Bi-directional flow meter with two fluidic oscillators connected in series
US10646886B2 (en) 2015-06-08 2020-05-12 Fdx Fluid Dynamix Gmbh Fluidic oscillator and applications of the fluidic oscillator
US11471898B2 (en) 2015-11-18 2022-10-18 Fdx Fluid Dynamix Gmbh Fluidic component
DE102016120454A1 (en) 2016-10-26 2018-04-26 Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung (Bam) Method and device for examining a sample
WO2018077759A1 (en) 2016-10-26 2018-05-03 Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung, (Bam) Method and device for analyzing a sample
US11221313B2 (en) 2016-10-26 2022-01-11 Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie Method and device for examining a sample
US20220280963A1 (en) * 2021-03-04 2022-09-08 Stratec Se Sensor for determining the oscillating frequency in a fluidic oscillating nozzle and a method using the sensor
RU2816742C1 (en) * 2023-03-17 2024-04-03 Федеральное государственное бюджетное учреждение науки Институт проблем управления им. В.А. Трапезникова Российской академии наук Annular jet oscillator

Also Published As

Publication number Publication date
JPS5724848B2 (en) 1982-05-26
GB1453587A (en) 1976-10-27
DE2414970A1 (en) 1974-10-17
FR2224743B1 (en) 1978-03-24
FR2224743A1 (en) 1974-10-31
JPS5036162A (en) 1975-04-05
DE2414970C2 (en) 1984-07-19

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