DE878117C - Dynamic pressure meter for speed profiles - Google Patents

Dynamic pressure meter for speed profiles

Info

Publication number
DE878117C
DE878117C DEK11992A DEK0011992A DE878117C DE 878117 C DE878117 C DE 878117C DE K11992 A DEK11992 A DE K11992A DE K0011992 A DEK0011992 A DE K0011992A DE 878117 C DE878117 C DE 878117C
Authority
DE
Germany
Prior art keywords
pressure
dynamic pressure
pressure meter
total
speed profiles
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
Application number
DEK11992A
Other languages
German (de)
Inventor
Guenther Dr-Ing Kempf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEK11992A priority Critical patent/DE878117C/en
Application granted granted Critical
Publication of DE878117C publication Critical patent/DE878117C/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Description

Pitotrohre zur Messung der Geschwindigkeit, bei denen lein Rohr I für den stantischen Druck und ein Rohr 2 für den Gesamtdruck gegeneinandergeschaltet sind, um den dynamischen Druck und damit die STrömungsgeschwindikeit unmittelbar abzulesen, sind bekannt. Pitot tubes for measuring the speed at which lein tube I. for the constant pressure and a pipe 2 for the total pressure connected against each other are to the dynamic pressure and thus the STrömungsgeschwindikeit directly read are known.

Solche Pitortohe liefern die Strömmungsgeschwindigkeit an einem Punkt. Um die Geschwindigkeit an anderen Punkte zu messen, muß entweder das Pitorthr bewegt werden, oder es können mehnere Meßrohre kammartig angeordnet werden, Idie dann den Staudruck gleichzeitig an mehreren Stellen angeben. Such pitot holes provide the flow rate at one point. To measure the speed at other points, either the Pitorthr must be moved or several measuring tubes can be arranged like a comb, then the Specify back pressure in several places at the same time.

Bei größeren Strömungsgeschwindigkeiten, wie sie z. B. blei Schiffen vorkommen, muß Quecksilber zur Anzeige verwndt wereen, um nicht zu große Druckhöhen zu bekommen. Die Druckunterschiede an den verschiedenen Stellen eines Geschwindigkeitsprofils sind dann aber nur gering, und da ihre Höhen außerdem bei unruhiger strömmung schwnaken, werden die Ablesungen ungenau. At higher flow velocities, as z. B. lead ships occur, mercury must be used for the display so as not to high pressure levels to get. The pressure differences at the various points in a velocity profile are then only low, and since their heights also swell when the current is rough, the readings become inaccurate.

Diese Nachteile werden vermieden, wenn nach Idem Erfindungsgedanken jeweils zwei Staurohre 2 und 3 gegeneinandergeschaltet und in solchem Abstand angeordnet werden, daß ihre Difiierienzdruckhöhe an einem Wassermanometer abgelesen werden kann, wodurch die Differenz gegenüber Quecksilber etwa zwölfmal größer angezeigt wird. These disadvantages are avoided if according to the idea of the invention two Pitot tubes 2 and 3 connected to each other and arranged at such a distance that their Difiierienzdruckhöhe can be read on a water manometer can, whereby the difference compared to mercury appears about twelve times larger will.

Eine Leitung für Abnabme des statischen Drucks ist dabei gegen die Gesamdtdrukeoing eines der Staurohre geschjaltet. A line for decreases in static pressure is against that Gesamtdtdrukeoing one of the pitot tubes switched.

Ein solches mit dreit Druckohren versehense Staudrckgerät zeigt auf diese Weise z. B. an, ob neben der Schiffswand das äußerste Rohr bereits in der relativ zum Schiff ungestörten Strömung liegt, mithin die richtige Schiffsgeschwindikeit angibt, wenn die gegeneinan dergescalteten Gesamtdurckrohre keine Druckdifferenz mehr anzeigen. Such a pressure device provided with three pressure ears shows this way z. B. on whether the outermost tube in addition to the ship's wall The current is undisturbed relative to the ship, hence the correct speed of the ship indicates when the total pressure pipes connected against one another do not have a pressure difference show more.

Auf diese Weise läßt sich unmittelbar die Dicke der sogenannten Grenzschicht neben der Schiffswand messen.In this way, the thickness of the so-called boundary layer can be determined directly measure next to the ship's wall.

Ferner läßt sich bei stufeweisem Herausschieben des Staudruckgerätes das Gesdhwidgkeitsproflei sehr genau, ermitteln, weil sich die einzelnen Meßwere druch dir direkte Geschwindigketismesung und die Doifferenzmessung gegenesitig kontrollieren. Furthermore, when the dynamic pressure device is pushed out in stages determine the Gesdhwidgkeitproflei very precisely, because the individual measured values through you direct speed measurement and check the difference measurement in opposite directions.

Eine solche einfache und genaue Aufmessung des Geschwindigeitsprolies ist bei Schiffen z. B. erforderlich, um -daraus den Rauhigkeitswert der Schiffsoberfläche und seine Änderungen während der Reise nach Hafenliegezeiten zu berechnen. Denn jlede Rauhigkeiständerung verändert auch das Geschwindigkeitsprofil an der Schiffswand. Such a simple and precise measurement of the speed profile is for ships z. B. necessary to -from this the roughness value of the ship's surface and to calculate its changes during the voyage according to port lay times. Because Every change in roughness also changes the speed profile on the ship's side.

Ein solches Meßgerät zur laufenden Kontrolle der Schiffsrauhigkeit ermöglicht der Schiffsfiihrung und dem Reeder die Beurteilung, wann es. wirtschaftlich nötig ist, das Schiff zu docken und zu reinigen. Such a measuring device for the continuous control of the ship's roughness enables the ship's command and the shipowner to assess when it. economically is necessary to dock and clean the ship.

Claims (2)

P A T E N T A N S P R Ü C H E: I. Staudruchmesser für Geschwindigkeitsprofile, dadruch gekennzeichnet, daß die Gesamtdruckletungen zweier im Abstand voneinander nageordenter Staurohre gegeneinandergeschaltet sind, während eine IJeitXunlg für den statischen Druck in an sich bekannter Weise gegen, die Gesamdruckleitung eines der Staurohre geschaltet ist und Druckmeßvorrichtungen zur Bestimmung des Staudrucks sowie der Differenz der Gesamtdrucke dienen. P A T E N T A N S P R Ü C H E: I. Back pressure meter for velocity profiles, characterized by the fact that the total pressure lines are two at a distance from each other nageordenter pitot tubes are connected against each other, while an IJeitXunlg for counteract the static pressure in a manner known per se, the total pressure line of a the pitot tubes is connected and pressure measuring devices to determine the dynamic pressure as well as the difference between the total prints. 2. Staudrukmesser nach Anspruch I, dadurch gekennzeichnet, daß bei mehreren kammartig angeordneten Staurohren die Gesamtdruxckleitungen je sweier Sturohre wahlwise gegendinander schsltbar sind. 2. Staudrukmesser according to claim I, characterized in that at several comb-like arranged pitot tubes, the total pressure lines for each pitot tube are optionally switchable in relation to each other.
DEK11992A 1951-11-13 1951-11-13 Dynamic pressure meter for speed profiles Expired DE878117C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK11992A DE878117C (en) 1951-11-13 1951-11-13 Dynamic pressure meter for speed profiles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK11992A DE878117C (en) 1951-11-13 1951-11-13 Dynamic pressure meter for speed profiles

Publications (1)

Publication Number Publication Date
DE878117C true DE878117C (en) 1953-06-01

Family

ID=7213568

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK11992A Expired DE878117C (en) 1951-11-13 1951-11-13 Dynamic pressure meter for speed profiles

Country Status (1)

Country Link
DE (1) DE878117C (en)

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