DE102004020284B4 - Pitot tube - Google Patents
Pitot tube Download PDFInfo
- Publication number
- DE102004020284B4 DE102004020284B4 DE200410020284 DE102004020284A DE102004020284B4 DE 102004020284 B4 DE102004020284 B4 DE 102004020284B4 DE 200410020284 DE200410020284 DE 200410020284 DE 102004020284 A DE102004020284 A DE 102004020284A DE 102004020284 B4 DE102004020284 B4 DE 102004020284B4
- Authority
- DE
- Germany
- Prior art keywords
- dollar
- flow
- dynamic pressure
- sword
- flat
- 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.)
- Expired - Lifetime
Links
- 239000000523 sample Substances 0.000 claims abstract description 14
- 230000001154 acute effect Effects 0.000 claims abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000001133 acceleration Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract description 2
- 238000012935 Averaging Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
- G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
-
- 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
- G01F1/34—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 measuring pressure or differential pressure
- G01F1/36—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 measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/46—Pitot tubes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
Eine Staudrucksonde dient der Durchflussmessung von gas-, dampfförmigen und flüssigen Medien. DOLLAR A Herkömmliche Staudrucksonden sind rohrförmig, eckig oder mit Beschleunigungskehren ausgeführt und haben meistens in etwa die gleiche Breite wie Tiefe und verursachen als Störkörper in einer Strömung Wirbel. Dadurch ergeben sich folgende Nachteile: Schwingungsbrüche, relativ hoher bleibender Druckverlust, Mess- und Linearitätsfehler. DOLLAR A Um folgende Vorteile zu erzielen: DOLLAR A a) wirbelfreien Abriss (keine Schwingungen) DOLLAR A a) zum Durchfluss lineare Kennlinie (bessere Genauigkeit) DOLLAR A c) äußerst geringen bleibenden Druckverlust (Energieverlust) wird vorgeschlagen, eine bekannte Staudrucksonde derart weiterzubilden, dass die Strömung durch eine schwertähnliche Formgebung kaum gestört wird und die Vorteile a), b) und c) zur Folge haben. DOLLAR A Das wird erreicht durch eine Staudrucksonde, mit einem flachen, schwertähnlichen Profil (1), welches in der Länge um ein Mehrfaches seiner Breite ausgelegt ist und an der vorderen und hinteren Mantelfläche mit spitzen Winkeln oder runden Bögen (2) versehen ist, wobei eine nutartige Wirkdruckwanne (4), die am Boden flach oder gewölbt ausgeführt ist und an den Enden mit Bögen versehen ist, an der Mündung der Wirkdruckbohrung (3) vorgesehen ist. DOLLAR A Würdigung zum Stand der Technik: DOLLAR A Zwar gibt es nach dem Stand der Technik Staudrucksonden mit flachem, schwertähnlichem Profil und auch solche, die eine Wirkdruckwanne aufweisen, jedoch ist eine Kombination ...A dynamic pressure probe is used to measure the flow of gas, vapor and liquid media. DOLLAR A Conventional dynamic pressure probes are tubular, square or executed with acceleration turns and usually have approximately the same width as depth and cause vortex as a disturbing body in a flow. This results in the following disadvantages: Vibration fractures, relatively high pressure drop, measurement and linearity errors. DOLLAR A To achieve the following advantages: DOLLAR A a) vortex-free demolition (no vibrations) DOLLAR A a) flow linear characteristic (better accuracy) DOLLAR A c) extremely low permanent pressure loss (energy loss) is proposed to develop a known pitot tube in such a way that the flow is hardly disturbed by a sword-like shape and the benefits a), b) and c) result. DOLLAR A This is achieved by a dynamic pressure probe, with a flat, sword-like profile (1) which is designed in length by a multiple of its width and is provided at the front and rear lateral surface with acute angles or round arcs (2) a groove-like differential pressure trough (4), which is designed flat or curved at the bottom and is provided at the ends with arches, at the mouth of the Wirkdruckbohrung (3) is provided. DOLLAR A assessment of the state of the art: DOLLAR A Although there are state-of-the-art dynamic pressure probes with a flat, sword-like profile and also those that have a differential pressure trough, but is a combination ...
Description
Eine Staudrucksonde dient der Durchflussmessung von gas-, dampfförmigen und flüssigen Medien.A Back pressure probe is used for flow measurement of gas, vapor and liquid Media.
Herkömmliche
Staudrucksonde sind rohrförmig,
eckig, oder mit Beschleunigungskehren ausgeführt und haben meistens in etwa
die gleiche Breite wie Tiefe und verursachen als Störkörper in
einer Strömung
Wirbel, die sich systematisch rechts und links ablösen. Wirbel
versetzen herkömmliche
Sonde in starke Schwingungen, welche nicht selten zu Schwingungsbrüchen führen. Zudem
beeinflussen Wirbel die Linearität
zum Durchfluss und beeinflussen die Genauigkeit. Die größeren Anströmflächen herkömmlicher
Staudrucksonden verursachen erhebliche bleibende Druckverluste,
die fast immer einher gehen mit Energieverlust. Aus der
Um folgende Vorteile zu erzielen :
- a) wirbelfreien Abriss (keine Schwingungen)
- a) zum Durchfluss lineare Kennlinie (bessere Genauigkeit)
- c) äußerst geringen bleibenden Druckverlust (Energieverlust)
- a) vortex-free demolition (no vibrations)
- a) linear flow characteristic (better accuracy)
- c) extremely low pressure loss (loss of energy)
Das
wird erreicht durch eine Staudrucksonde, mit einem flachen, schwertähnlichen
Profil (
Bei herkömmlichen Staudrucksonden wird der Wirkdruck meistens durch mehrere Bohrungen aufgenommen und in den Wirkdruckkammern zusammen geführt. Eine exakte Mittelung erfolgt nicht, weil sich der Druck in der Wirkdruckkammern zu niedrigsten anstehenden Druck entspannt. Je länger eine Staudrucksonde ist, umso schlechter wird die für die Genauigkeit wichtige Mittelung des Wirkdruckes. at usual Pitot pressure probes, the differential pressure is usually absorbed by several holes and merged in the differential pressure chambers. An exact averaging does not take place because the pressure in the differential pressure chambers is lowest relaxed pressure. The longer a pitot tube is, the worse for the Accuracy important averaging of the differential pressure.
Deshalb verläuft die Eintauchtiefe der Sonde nach dieser Erfindung nicht mehr über den gesamten Querschnitt: Die Eintauchtiefe beträgt nur noch ca. 36 % zum Außendurchmesser eines inneren Rohrquerschnittes. Die Wirkdruckwanne hat eine Länge von ca. 8 bis 34 % ab äußeren Innendurchmesser. Die Formgebung und die Länge der Wirkdruckwanne, die sich im idealen Messfenster eines Strömungsprofils befindet, bewirken eine Mittelung des Wirkdruckes im Messfenster. Die Messgenauigkeit wird dadurch deutlich verbessert.Therefore extends the immersion depth of the probe according to this invention no longer on the entire cross-section: The immersion depth is only about 36% of the outside diameter an inner tube cross-section. The differential pressure pan has a length of about 8 to 34% from the outer inner diameter. The Shaping and the length the impulse sump, located in the ideal measuring window of a flow profile causes an averaging of the differential pressure in the measurement window. The measuring accuracy is thereby significantly improved.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410020284 DE102004020284B4 (en) | 2004-04-26 | 2004-04-26 | Pitot tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200410020284 DE102004020284B4 (en) | 2004-04-26 | 2004-04-26 | Pitot tube |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102004020284A1 DE102004020284A1 (en) | 2005-11-17 |
DE102004020284B4 true DE102004020284B4 (en) | 2006-12-28 |
Family
ID=35160322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200410020284 Expired - Lifetime DE102004020284B4 (en) | 2004-04-26 | 2004-04-26 | Pitot tube |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE102004020284B4 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10044659B4 (en) * | 2000-09-02 | 2009-03-19 | Hein, Stefan, Dr.-Ing. | Volume flow sensor for hydraulic fluids |
EP1904812B1 (en) * | 2005-07-14 | 2014-12-03 | systec Controls Mess- und Regeltechnik GmbH | Ram pressure probe |
DE202020102087U1 (en) | 2020-04-15 | 2021-07-16 | Postberg + Co. GmbH | Measuring probe |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1872561U (en) * | 1963-03-14 | 1963-05-22 | Metrawatt Ag | ACTIVE PRESSURE GENERATOR FOR MEASURING THE FLOW SPEED OF LIQUIDS. |
US4343194A (en) * | 1977-11-07 | 1982-08-10 | Environmental Elements Corporation | Flow sensing apparatus |
US4735100A (en) * | 1986-05-26 | 1988-04-05 | Nailor-Hart Industries Inc. | Fluid flow sensor having multiplying effect |
US5379650A (en) * | 1992-09-23 | 1995-01-10 | Korr Medical Technologies Inc. | Differential pressure sensor for respiratory monitoring |
EP1296118A1 (en) * | 2001-09-19 | 2003-03-26 | Abb Research Ltd. | Device to measure gas consumption |
-
2004
- 2004-04-26 DE DE200410020284 patent/DE102004020284B4/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1872561U (en) * | 1963-03-14 | 1963-05-22 | Metrawatt Ag | ACTIVE PRESSURE GENERATOR FOR MEASURING THE FLOW SPEED OF LIQUIDS. |
US4343194A (en) * | 1977-11-07 | 1982-08-10 | Environmental Elements Corporation | Flow sensing apparatus |
US4735100A (en) * | 1986-05-26 | 1988-04-05 | Nailor-Hart Industries Inc. | Fluid flow sensor having multiplying effect |
US5379650A (en) * | 1992-09-23 | 1995-01-10 | Korr Medical Technologies Inc. | Differential pressure sensor for respiratory monitoring |
EP1296118A1 (en) * | 2001-09-19 | 2003-03-26 | Abb Research Ltd. | Device to measure gas consumption |
Also Published As
Publication number | Publication date |
---|---|
DE102004020284A1 (en) | 2005-11-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8122 | Nonbinding interest in granting licences declared | ||
8364 | No opposition during term of opposition | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R073 | Re-establishment requested | ||
R124 | Re-establishment decision now final |