DE1053203B - Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines - Google Patents

Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines

Info

Publication number
DE1053203B
DE1053203B DES52041A DES0052041A DE1053203B DE 1053203 B DE1053203 B DE 1053203B DE S52041 A DES52041 A DE S52041A DE S0052041 A DES0052041 A DE S0052041A DE 1053203 B DE1053203 B DE 1053203B
Authority
DE
Germany
Prior art keywords
flow
turbine
heated
feed line
thermometer
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.)
Pending
Application number
DES52041A
Other languages
German (de)
Inventor
Dipl-Ing Dr Fritz Woehr
Dr Fritz Lieneweg
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DES52041A priority Critical patent/DE1053203B/en
Publication of DE1053203B publication Critical patent/DE1053203B/en
Pending 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
    • G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
    • 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
    • G01F1/68—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 thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)

Description

Vorrichtung zur Strömungsmessung, vorzugsweise in der Turbinenzuleitung oder im Turbinengehäuse von Wasserturbinen Bei Wasserkraftwerken, die zur Deckung von Verbrauchsspitzen herangezogen, werden, sind die Turbinen häufig sehr unregelmäßig belastet. In den Turbinenzuleitungen bzw. im Turbinengehäuse treten je nach der Beaufschlagung Wassergeschwindigkeiten von 1 cm/sec und weniger bis zu einigen m/sec auf. Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines in hydroelectric power plants that are used to cover are used for consumption peaks, the turbines are often very irregular burdened. In the turbine feed lines or in the turbine housing occur depending on the Application of water speeds of 1 cm / sec and less up to a few m / sec on.

Während die größeren Strömungsgeschwindi(gkeiten nach dem. Differenzdruckverfahren bestimmt werden können, ist für die kleinen Strömungsgeschwin.digkeiten in neuerer Zeit vorgeschlagen worden, beheizte Thermometer in der Strömung anzuordnen und deren Abkühlung in Abhängigkeit von der Strömungsgeschwindigkeit in einer Brückenschaltung zu messen.While the higher flow velocities are based on the differential pressure method can be determined is for the small flow velocities in newer It has been proposed to place heated thermometers in the flow and their time Cooling as a function of the flow velocity in a bridge circuit to eat.

Die Abkühlung des mit konstanter elektrischer Leistung beheizten Thermometers verläuft in Abhängigkeit von der Strömungsgeschwindigkeit nach einem Exponentialgesetz. Verwendet man Thermometer mit kleiner Anzeigeverzögerung, so verlauft die Ablkühlungslkurve bei Strömungsgeschwindigkeiten von einigen cm/sec schon sehr flach, so daß in diesem. Bereich eine genaue Anzeige nicht mehr zu erhalten ist.The cooling of the thermometer heated with constant electrical power runs according to an exponential law as a function of the flow velocity. If a thermometer with a small display delay is used, the cooling curve runs at flow velocities of a few cm / sec already very flat, so that in this. An exact display can no longer be obtained.

Da bei diesen kleinen Strömungsgeschwindigkeiten auch jdas Differenzdruckverfahren noch nicht genau arbeitet, liegt der Erfindung die Aufgabe zugrunde, den Meßbereich einer Vorrichtung mit beheiztem Thermometer zu größeren Strömungsgeschwindilgkeiten hin zu erweitern.Since with these small flow velocities also the differential pressure method does not work exactly, the invention is based on the object, the measuring range a device with a heated thermometer for greater flow speeds to expand.

Dies ist gemäß der Erfindung dadurch möglich, daß die Strömungsgeschwindigkeit in der Umgebung des beheizten Thermometers durch Einbauteile, dieden Strömungswiderstand vergrößern (z. B. Blen,den, Rechen, Siebe od. dgl.), verringert ist. Hierzu wird das beheizte Thermometer z. B. hinter einem einen Teil der Strömung stauenden Venturirohr oder einer Blende angeordnet. Es ist auch möglich, das Thermoo meter mit einer zylindrischen Abschirmung in Form eines Käfigs zu umgeben, die Zu- und Abfluß öffnungen für dile Strömung besitzt. Durch diese Maßnahmen gelingt es, den Verlauf der Abkiihlungskurve flacher zu gestalten uníd Strömungsgeschwindigkeiten bis zu einigen cm/sec mit ausreichender Genauigkeit anzuzeigen. This is possible according to the invention in that the flow rate in the vicinity of the heated thermometer by built-in parts that increase the flow resistance increase (e.g. Blen, rake, sieve or the like), is reduced. This is done the heated thermometer z. B. behind a part of the flow damming Venturi tube or a diaphragm. It is also possible to use the thermometer with a cylindrical Shielding in the form of a cage to surround the inflow and outflow openings for dile Owns current. Through these measures it is possible to change the course of the cooling curve to design flatter and flow velocities up to a few cm / sec with sufficient Display accuracy.

Die Zeichnung zeigt einige Ausführungsbeispiele für ldie Erfindung. Nach Fig. 1 und 2 ist das beheizte Thermometer 1 von einem zylindrischen Schutzkäfig 2 umgeben. Fig. 1 stellt hierbei einen Grundriß, Fig. 2 die Ansicht derselbenAnordnung dar. Der zylindrische Schutzkäfig besitzt eine Anzahl von Öffnungen 3. Der Durchmesser der Öffnungen wird zweckmäßig so groß gewählt, daß die Öffnungen nicht durch Verunreinigung verstopft werden, welche die Strömung etwa mitführt. Die Pfeile 4 deuten den Verlauf der Strömung an. The drawing shows some exemplary embodiments for the invention. According to FIGS. 1 and 2, the heated thermometer 1 is a cylindrical protective cage 2 surrounded. Fig. 1 is a plan view, Fig. 2 is a view of the same arrangement The cylindrical protective cage has a number of openings 3. The diameter the openings is expediently chosen so large that the openings are not contaminated become clogged, which the current carries with it. The arrows 4 indicate the course the current.

Nach Fig. 3 wird ein Teil. der durch die Pfeile 4 versinnbildlichten Strömung mit Hilfe eines Venturirohres 5 gestaut. Hinter dem Venturirohr an tder Stelle 6 ist die Strömungsgeschwindigkeit wesentlich geringer als außerhalb des Rohres, und an dieser Stelle ist das beheizte Thermometer angeordnet. According to Fig. 3 is a part. the one indicated by the arrows 4 symbolize The flow is blocked with the aid of a venturi 5. Behind the venturi at tder Point 6, the flow velocity is much lower than outside of the Tube, and this is where the heated thermometer is located.

An Stelle des Venturirohres kann auch eine Staublende in die Strömung eingesetzt werden, hinter der das beheizte Thermometer liegt. Es ist auch möglich, das Thermometer mit einem gitterartigen Schutzkäfig zu umgeben. Hierbei werden die Gittersttäbe breiter als die Öffnungen zwischen den Stäben gewählt, damit die Strömungsgeschwindfibikeit ausreichend herabgesetzt wird. Instead of the Venturi tube, a dust shield can also be placed in the flow behind which the heated thermometer is located. It is also possible, to surround the thermometer with a grid-like protective cage. Here are the Lattice bars are chosen wider than the openings between the bars, so that the flow velocity fibikeit is sufficiently reduced.

Die Erfindung kann überall dort angewendet werden,, wo kleine Wassengeschwindigkeiten zu messen sind. Außer dem obengenannten Anwendungsfall bei Wasserturbinen kann die 5 trnmungsgeschwindigleit z. B. in Wasserleitungen von Versorgungsuetzen, in offenen Geringen und in Grundwasserströmungen gemessen werden. The invention can be used wherever low water velocities are to be measured. In addition to the above-mentioned application in water turbines, the 5 trnmungsgeschwindigleit z. B. in water pipes of supply utilities, in open Low and measured in groundwater currents.

Claims (3)

P A T E N T A N S P R Ü C H E: 1. Vorrichtung zur Strömungsmessung, vorzugsweise in der Turbinenzuleitung oder im Turbinen gehäuse von Wasserturbinen mit Hilfe von beheizten Thermometern in der Strömung, dadurch gekennzeichnet, daß die 5 trömnngsgeschwindigkeit in der Umgebung des beheizten Thermometers durch Einbauteile, die den Strömungswiderstand erhöhen (z. B. Blenden, Siebe, Rechen od. dgl.), verringert ist. P A T E N T A N S P R Ü C H E: 1. Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines with the help of heated thermometers in the flow, characterized in that the 5 flow velocity in the vicinity of the heated thermometer through built-in parts that increase the flow resistance (e.g. screens, sieves, rakes or the like), is reduced. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das beheizteTherm.ometer hinter einem einen Teil der Strömung stauenden Venturirohr oder einer Staublende angeordnet ist. 2. Device according to claim 1, characterized in that the heated therm.ometer Behind a venturi that blocks part of the flow or a dust shutter is arranged. 3. Vorrichtung nach Anspruch 1, gekennzeichnet durch eine das beheizte Thermometer mit Abstanld umgebende, vorzugsweise zylindrische Hülle mit Zu- und Abflußöffnungen für die Strömung. 3. Apparatus according to claim 1, characterized by the heated Thermometer with spacing surrounding, preferably cylindrical shell with inlet and Drainage openings for the flow.
DES52041A 1957-01-24 1957-01-24 Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines Pending DE1053203B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES52041A DE1053203B (en) 1957-01-24 1957-01-24 Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES52041A DE1053203B (en) 1957-01-24 1957-01-24 Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines

Publications (1)

Publication Number Publication Date
DE1053203B true DE1053203B (en) 1959-03-19

Family

ID=7488532

Family Applications (1)

Application Number Title Priority Date Filing Date
DES52041A Pending DE1053203B (en) 1957-01-24 1957-01-24 Device for flow measurement, preferably in the turbine feed line or in the turbine housing of water turbines

Country Status (1)

Country Link
DE (1) DE1053203B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2409492A1 (en) * 1977-11-16 1979-06-15 Bosch Gmbh Robert DEVICE FOR MEASURING AIR FLOWS
FR2445954A1 (en) * 1979-01-04 1980-08-01 Bosch Gmbh Robert DEVICE FOR MEASURING THE MASS OF A FLOWING FLUID, ESPECIALLY ON INTERNAL COMBUSTION ENGINES
FR2528186A1 (en) * 1982-06-07 1983-12-09 Deude Rene Fluid jet system for detecting presence of drill - uses thermistor to sense cooling effect generated when fluid strikes object for automatic control of drill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2409492A1 (en) * 1977-11-16 1979-06-15 Bosch Gmbh Robert DEVICE FOR MEASURING AIR FLOWS
FR2445954A1 (en) * 1979-01-04 1980-08-01 Bosch Gmbh Robert DEVICE FOR MEASURING THE MASS OF A FLOWING FLUID, ESPECIALLY ON INTERNAL COMBUSTION ENGINES
FR2528186A1 (en) * 1982-06-07 1983-12-09 Deude Rene Fluid jet system for detecting presence of drill - uses thermistor to sense cooling effect generated when fluid strikes object for automatic control of drill

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