DE19724116A1 - Device for correcting errors from flow=through measuring device - Google Patents
Device for correcting errors from flow=through measuring deviceInfo
- Publication number
- DE19724116A1 DE19724116A1 DE19724116A DE19724116A DE19724116A1 DE 19724116 A1 DE19724116 A1 DE 19724116A1 DE 19724116 A DE19724116 A DE 19724116A DE 19724116 A DE19724116 A DE 19724116A DE 19724116 A1 DE19724116 A1 DE 19724116A1
- Authority
- DE
- Germany
- Prior art keywords
- flow
- inflow
- shear stress
- wall shear
- correcting errors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Abstract
Description
Die Erfindung betrifft die Durchflußmessung in Kreisrohrströmungen von Gasen und Flüssigkeiten. Durchflußmeßgeräte werden im allgemeinen bei ausgebildeter Rohrströmung kalibriert. Im praktischen Einsatz führen Abweichungen von der ausgebildeten Rohrströmung in der Zuströmung zu Meßfehlern, die bisher nur durch ein für jede spezielle Abweichung notwendiges Kalibrieren behoben werden können. Es stellt sich daher die Aufgabe, ein Verfahren und eine Vorrichtung zu entwickeln, um für beliebige Geschwindigkeitsverteilungen in der Zuströmung die erforderlichen Korrekturen der Durchflußmeßdaten zu bestimmen. Dazu wird der Verlauf der Wandschubspannung nach Größe und Richtung über dem Kreisrohrumfang in der Zuströmung gemessen. Dieser Verlauf ist in Kombination mit dem Meßwert des Durchflußmeßgerätes ein direktes Maß für die Geschwindigkeitsverteilung im Rohr und damit für den gesuchten Volumenstrom.The invention relates to the flow measurement in circular tube flows of gases and Liquids. Flow meters are generally trained Pipe flow calibrated. In practical use, deviations from the trained pipe flow in the inflow to measurement errors, which so far only through a calibration necessary for each special deviation can be eliminated. The task therefore is to develop a method and a device to the required for any speed distribution in the inflow To determine corrections to the flow measurement data. The course of the Wall shear stress according to size and direction over the circumference of the circular tube in the Inflow measured. This course is in combination with the measured value of the Flow meter a direct measure of the speed distribution in the pipe and thus for the volume flow sought.
Die Messung des Verlaufes der Wandschubspannung über dem Umfang erfolgt in einem Vorsatzgerät, das als kurzes Rohrstück mit dem passenden Durchmesser in die Zuleitung vor dem Durchflußmeßgerät eingebaut wird. Das Vorsatzgerät ist auf der Rohrinnenseite nach Fig. 1 mit mehreren auf dem Umfang gleichmäßig verteilten Meßfühlern zur Messung der Wandschubspannung nach Größe und Richtung versehen. Die Meßfühler sind entweder sogen. Oberflächenzäune (Fig. 1b) oder sog. Prestonrohre (1c). Sie sind nach Fig. 1 winkelig angeordnet, um auch die Umfangskomponente der Wandschubspannung erfassen zu können: Je größer die Anzahl der Meßfühler ist, desto genauer läßt sich die Geschwindigkeitsverteilung in der Zuströmung kennzeichnen. Die genannten Meßfühler für die Wandschubspannungsmessung entsprechen dem Stand der Technik, siehe Wolfgang Nitsche, Strömungsmeßtechnik, Springer-Verlag, Berlin, Heidelberg, 1994. The measurement of the course of the wall shear stress over the circumference is carried out in a front attachment, which is installed as a short piece of pipe with the appropriate diameter in the feed line in front of the flow meter. The attachment is provided on the inside of the tube according to FIG. 1 with several sensors distributed evenly over the circumference for measuring the wall shear stress according to size and direction. The sensors are either so-called. Surface fences ( Fig. 1b) or so-called Preston tubes (1c). They are arranged at an angle according to Fig 1 in order to detect the circumferential component of the wall shear stress. The greater the number of sensors, the more accurately the velocity distribution can be characterized in the inflow. The sensors mentioned for wall shear stress measurement correspond to the state of the art, see Wolfgang Nitsche, flow measurement technology, Springer-Verlag, Berlin, Heidelberg, 1994.
Die Oberflächenzäune haben eine Höhe von 0,1 mm bis 0,5 mm, und die Differenz des Wanddruckes vor und hinter dem Zaun ist ein Maß für die Wandschubspannungskomponente senkrecht zum Zaun.The surface fences have a height of 0.1 mm to 0.5 mm, and the difference The wall pressure in front of and behind the fence is a measure of that Wall shear stress component perpendicular to the fence.
Die Prestonsonde ist eine auf der Wand aufliegende Gesamtdrucksonde (Pitotsonde), die in Kombination mit dem Wanddruck am Ort ebenfalls einen Meßwert für die Wandschubspannung liefert.The Preston probe is a total pressure probe resting on the wall (Pitot probe), which in combination with the wall printing on site also has a Provides measured value for the wall shear stress.
Die Zuordnung der gemessenen Verteilung der Wandschubspannung mit der Geschwindigkeitsverteilung im Rohr und damit mit dem Volumenstrom kann entweder durch Kalibration erfolgen oder durch einen theoretischen Zusammenhang, der sich aus Berechnungen der Rohrströmung in der Zuleitung zum Durchflußmeßgerät ergibt.The assignment of the measured distribution of the wall shear stress with the Speed distribution in the pipe and thus with the volume flow can either by calibration or by a theoretical connection, which results from calculations of the pipe flow in the supply line to the Flow meter results.
Die beschriebene Vorrichtung kann als Zusatzgerät für vorhandene Durchflußmeßgeräte verwendet werden. Sie kann auch mit herkömmlichen Durchflußmeßgeräten kombiniert werden und damit zu verbesserten Durchflußmeßgeräten führen, die beliebige Zuströmungen zulassen.The device described can be used as an additional device for existing ones Flow meters are used. You can also use conventional Flow meters can be combined and thus improved Flow meters that allow any inflow.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19724116A DE19724116C2 (en) | 1997-06-09 | 1997-06-09 | Method and device for correcting incorrect measured values from flowmeters as a result of a faulty inflow |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19724116A DE19724116C2 (en) | 1997-06-09 | 1997-06-09 | Method and device for correcting incorrect measured values from flowmeters as a result of a faulty inflow |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19724116A1 true DE19724116A1 (en) | 1998-12-10 |
DE19724116C2 DE19724116C2 (en) | 2001-03-08 |
Family
ID=7831826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19724116A Expired - Fee Related DE19724116C2 (en) | 1997-06-09 | 1997-06-09 | Method and device for correcting incorrect measured values from flowmeters as a result of a faulty inflow |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19724116C2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001040741A1 (en) * | 1999-12-02 | 2001-06-07 | Ruhrgas Aktiengesellschaft | Method and device for measuring the through flow of gases and liquids |
DE102005052230B4 (en) * | 2005-11-02 | 2009-01-15 | Institut für Luft- und Kältetechnik gGmbH | Fencing probe and method for volume flow determination |
DE102007053105A1 (en) | 2007-11-05 | 2009-05-07 | Dues, Michael, Dr.-Ing. | Fluid's volumetric flow measuring method for use in pipeline of hydraulic system, involves carrying out additional flow diagnosis in hydraulic system and partial monitoring of magnetic-inductive flow-measuring device for error diagnosis |
EP3553533A1 (en) * | 2018-04-12 | 2019-10-16 | Technische Universität Berlin | Boundary layer probe, measuring device and method for determining a fluid flow |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4384469A (en) * | 1981-03-30 | 1983-05-24 | The United States Of America As Represented By The Secretary Of The Air Force | Pitot-static tube tester system |
US5559279A (en) * | 1995-01-19 | 1996-09-24 | United Sciences, Inc. | Method and apparatus for dynamic calibration of a flow monitor |
-
1997
- 1997-06-09 DE DE19724116A patent/DE19724116C2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4384469A (en) * | 1981-03-30 | 1983-05-24 | The United States Of America As Represented By The Secretary Of The Air Force | Pitot-static tube tester system |
US5559279A (en) * | 1995-01-19 | 1996-09-24 | United Sciences, Inc. | Method and apparatus for dynamic calibration of a flow monitor |
Non-Patent Citations (1)
Title |
---|
GOLDSTEIN R.J.: Fluid mechanics measurement, Springer-Verlag, Berlin, Heidleberg, 1983, S. 61-63, 536, 561, 565-569, 572 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001040741A1 (en) * | 1999-12-02 | 2001-06-07 | Ruhrgas Aktiengesellschaft | Method and device for measuring the through flow of gases and liquids |
DE19957956A1 (en) * | 1999-12-02 | 2001-06-07 | Ruhrgas Ag | Method and device for flow measurement of gases and liquids |
DE102005052230B4 (en) * | 2005-11-02 | 2009-01-15 | Institut für Luft- und Kältetechnik gGmbH | Fencing probe and method for volume flow determination |
DE102007053105A1 (en) | 2007-11-05 | 2009-05-07 | Dues, Michael, Dr.-Ing. | Fluid's volumetric flow measuring method for use in pipeline of hydraulic system, involves carrying out additional flow diagnosis in hydraulic system and partial monitoring of magnetic-inductive flow-measuring device for error diagnosis |
EP3553533A1 (en) * | 2018-04-12 | 2019-10-16 | Technische Universität Berlin | Boundary layer probe, measuring device and method for determining a fluid flow |
WO2019197614A1 (en) * | 2018-04-12 | 2019-10-17 | Technische Universität Berlin | Boundary layer probe, measuring assembly, and method for determining a fluid flow |
Also Published As
Publication number | Publication date |
---|---|
DE19724116C2 (en) | 2001-03-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE4423168A1 (en) | Mass flow meter | |
DE2525742B2 (en) | Device for calibrating a flow meter for liquids | |
DE102010053261B4 (en) | Measuring capsule for flow measurement | |
EP1296118B1 (en) | Device to measure gas consumption | |
DE19724116A1 (en) | Device for correcting errors from flow=through measuring device | |
DE19735066C1 (en) | Particle counter evaluation method | |
DE102007053105B4 (en) | Method and device for volume flow measurement of fluids in pipelines | |
DE102017001049A1 (en) | Differential pressure transmitters | |
DE2821711A1 (en) | METHOD AND DEVICE FOR CHECKING A FLOW METER | |
DE2222160A1 (en) | PROCEDURE FOR INCREASING THE RESOLUTION CAPACITY OF A FLOW MEASURING INSTRUMENT | |
DE112011102854T5 (en) | Method and apparatus for calibrating a flowmeter | |
DE102014110556B3 (en) | Device for flow measurement | |
DE2745609C2 (en) | Device for measuring flowing media, in particular for determining the amount of a liquid flowing under pressure in a line system | |
DE19605652A1 (en) | Ultrasound flowmeter calibration method | |
WO2019129480A1 (en) | Tube for a transducer, transducer comprising such a tube, and measuring system formed therewith | |
EP1236024B1 (en) | Method and device for measuring the through flow of gases and liquids | |
EP0556635B1 (en) | Ultrasonic apparatus for measuring wall thickness, particularly for extruded tubes | |
DE19947992C2 (en) | Method and measuring system for checking a flow meter when installed | |
DE558231C (en) | Measuring device for mixtures of gaseous and dusty components | |
WO2000008452A1 (en) | Device for continuously measuring the dust concentration in exhaust air and waste gas channels and in smokestacks | |
DE3441110C2 (en) | Device for measuring and monitoring the amount of liquid flowing into a tank via the tank filling pipe | |
DD143822A1 (en) | SEIFENFILMSTROEMUNGSMESSER PIPE | |
DE2828129A1 (en) | Flowmeter coping with contaminated media - measures pressure required to feed small constant flow to tapping holes | |
DE102016117478A1 (en) | fluid meter | |
DE2058587C3 (en) | Measuring device for gas flow measurements by means of a pitot tube in ducts |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8122 | Nonbinding interest in granting licences declared | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |