WO1996019674A1 - Dispositif permettant de limiter le flux volumetrique d'un fluide sous pression - Google Patents

Dispositif permettant de limiter le flux volumetrique d'un fluide sous pression Download PDF

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Publication number
WO1996019674A1
WO1996019674A1 PCT/DE1995/001834 DE9501834W WO9619674A1 WO 1996019674 A1 WO1996019674 A1 WO 1996019674A1 DE 9501834 W DE9501834 W DE 9501834W WO 9619674 A1 WO9619674 A1 WO 9619674A1
Authority
WO
WIPO (PCT)
Prior art keywords
swirl
flow
cross
main axis
flow channel
Prior art date
Application number
PCT/DE1995/001834
Other languages
German (de)
English (en)
Inventor
Johann Meseth
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP95942032A priority Critical patent/EP0799385B1/fr
Priority to DE59502286T priority patent/DE59502286D1/de
Publication of WO1996019674A1 publication Critical patent/WO1996019674A1/fr
Priority to FI972577A priority patent/FI112274B/fi

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/0015—Whirl chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/16—Vortex devices, i.e. devices in which use is made of the pressure drop associated with vortex motion in a fluid

Definitions

  • Swirl generation also occurs, for example, when water drains through the drain opening in a bathtub.
  • a region of low pressure in particular negative pressure, forms around the main axis, in which steam flows under saturation pressure or steam or gas of low density, as a result of which the volume and mass flow of the fluid are reduced.
  • a connection of the swirl generation element to the flow channel guarantees a deflection of the flow from a flow direction in a plane perpendicular to the main axis into a flow direction parallel to the axis of the flow channel.
  • the axis of the flow channel and the The main axis of the device are preferably identical, at least largely parallel to one another.
  • the inflow component preferably has an inflow opening that is spaced from the main axis. In this way, a tangential flow perpendicular to the main axis can be achieved with little pressure loss.
  • the swirl generating element is preferably arranged in a container of the system at which the flow channel ends.
  • the inflow opening in the container can be spaced substantially further from the main axis, which preferably coincides with the axis of the flow channel, than a wall of the flow channel.
  • the distance between the inflow opening and possibly a swirl vane from the axis is preferably larger than the diameter of the flow channel.
  • a diffuser in particular a radial diffuser, is preferably arranged between the swirl generating element and the cross-sectional constricting element, which causes an increase in the flow cross section of the device from the cross-sectional constricting element to the swirl generating element.
  • the flow cross section of the swirl generating element is preferably larger than the cross section of the flow channel, so that during normal operation of the system, in particular a cooling system of a nuclear power plant, the additional flow pressure losses of the cross sectional constriction element and swirl generating element due to the additional pressure recovery in the Diffuser is at least compensated, ie the normal volume flow through the device is not changed.
  • FIG. 1 shows a device in a system for guiding a pressurized fluid in one
  • the device 1 has a swirl generating element 4 with swirl blades 10, which are arranged on a circle 11 in a plane perpendicular to a main axis 3a of the device 1.
  • the wire production element 4 forms in the region of the inflow openings 15 a circular disk-shaped inflow component 14 extending substantially perpendicular to the main axis 3a.
  • the radius of the circle 11 is more than twice as large as the radius of the circular pipeline 2a.
  • a cross-sectional constriction element 5 in the form of a Venturi tube connects to the diffuser 7.
  • the smallest inner diameter of the cross-sectional constriction element 5 is approximately 62.5% of the inner diameter of the pipeline 2a.
  • the device 1 with the swirl generating element 4, the diffuser 7 and the cross-sectional constricting element 5 forms a structural unit which is introduced into the pipeline 2a from the inside of the reactor pressure vessel 6a, so that the swirl generating element 4 in the Reactor pressure vessel 6a remains and the cross-sectional constriction element 5 projects into the line end 9. Due to the arrangement of the swirl blades 10 shown in FIG.
  • the device 1 calls no or only insignificant additional flow ⁇ resistance.
  • the height of the swirl generating element 4 of approximately 30 mm and the radius of the circle 11 of approximately 600 mm are selected such that the outflow cross-sectional area of the device 1 is significantly larger than the inflow area given by the cross-sectional area of the pipeline 2a.
  • the volume flow of the fluid is not impaired during normal operation of the boiling water nuclear reactor system.
  • the narrowing of the cross section the pipe 2a through the cross-sectional constriction element 5 is approximately 39%. If additional flow pressure losses are permissible, this narrowest cross-section can be reduced even further, for example to 27% of the cross-sectional area of the pipeline 2a, if the additional pressure loss coefficient ⁇ additionally equals 1 or 19% of the cross-sectional area of the pipeline 2a if ⁇ additionally the same 3 is.
  • the inflow opening 15 and the swirl blades 10 are arranged as far as possible from an axis 3 of the flow channel 2. It is spaced apart from the main axis 3a, which coincides with the axis 3 of the flow channel, by more than twice the radius of the pipeline 2a.
  • a pressure recovery is disturbed by the swirl generating element 4, at most slightly.
  • the fluid flowing into the reactor pressure vessel 6a leaves the swirl generating element 4 almost without swirl.
  • the swirl generating element 4 contributes significantly to the reduction and limitation of the volume flow and the mass flow in the event of a line break in the pipeline 2a.
  • the outflow cross-section of the fluid in the pipeline 2a which is already greatly reduced in any case by the cross-sectional constriction element 5, thus has a mass flow density that becomes ever lower towards the main axis 3.
  • the outflowing volume flow or mass flow is thus further significantly reduced by the swirl generated in the swirl generating element 4 in addition to the reduction due to the narrowing of the cross section.
  • This reduction or limitation of the volume flow as a result of an additional swirl also occurs, for example, when water flows out of a bath tub, this outflow being slower the stronger the vortex which is formed in the drain pipe.
  • the inflow component 14 experiences significantly reduced static pressures only in the vicinity of the main axis 3a; the swirl destruction element 8, however, is designed for the full static differential pressure.
  • the swirl destruction element 8 With the exception of the vortex core, a potential vortex which forms in the swirl generating element 4 and the swirl destruction element 8 represents a largely swirl-free flow. Friction effects occur practically only on the inner walls of the swirl generating element 4 and the swirl eliminating element 8 is however relatively low due to the relatively low flow velocity in the area of the inner walls.
  • a calm flow zone is formed in the vicinity of the main axis 3a, which roughly corresponds to the "eye of a typhoon".
  • the emerging volume flow is limited to approximately 120% of the normal volume flow.
  • the volume flow in the event of a leak is limited by generating swirl in a plane perpendicular to the flow direction of the fluid in the flow channel.
  • the emerging volume flow can be limited to approximately 150% of the normal operating volume flow with little pressure loss. This corresponds to a reduction to approximately 75% of the volume flow exiting without the device.
  • the volume flow can be limited in the event of a rupture to below 50% of the normal operational volume flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

L'invention concerne un dispositif (1) permettant de limiter le flux volumétrique d'un fluide sous pression qui circule à travers un système comportant un canal d'écoulement (2). Ce dispositif (1) comporte un axe principal (3a) et un élément produisant un tourbillonnement (4), situé à distance de l'axe principal (3a) pour pouvoir produire le tourbillonnement, et qui sert à introduire le fluide dans le canal d'écoulement (2). Ce dispositif (1) se présente de préférence sous forme d'unité structurale comprenant l'élément à l'origine du tourbillonnement (4), un diffuseur (7) et un élément de rétrécissement de la section transversale (5). L'axe principal (3a) du dispositif (1) est de préférence parallèle à l'axe (3) du canal d'écoulement (2), de manière à ce que l'élément à l'origine du tourbillonnement (4) produise une composante tangentielle de la vitesse du fluide dans un plan perpendiculaire à l'axe (3), ce qui entraîne une diminution du flux volumétrique, en cas de rupture ou de fuites dans le canal d'écoulement (2). Un rétrécissement de la section transversale du canal d'écoulement (2) grâce à l'élément de rétrécissement de la section transversale (5) permet de diminuer davantage le flux volumétrique. L'invention concerne en outre un mode d'utilisation dudit dispositif dans le système de refroidissement d'une centrale à réacteur nucléaire.
PCT/DE1995/001834 1994-12-21 1995-12-21 Dispositif permettant de limiter le flux volumetrique d'un fluide sous pression WO1996019674A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP95942032A EP0799385B1 (fr) 1994-12-21 1995-12-21 Dispositif permettant de limiter le flux volumetrique d'un fluide sous pression
DE59502286T DE59502286D1 (de) 1994-12-21 1995-12-21 Vorrichtung zur begrenzung des volumenstroms eines unter druck stehenden fluides
FI972577A FI112274B (fi) 1994-12-21 1997-06-17 Laite paineellisen fluidin tilavuusvirran rajoittamiseksi

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4445701.4 1994-12-21
DE4445701 1994-12-21

Publications (1)

Publication Number Publication Date
WO1996019674A1 true WO1996019674A1 (fr) 1996-06-27

Family

ID=6536530

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001834 WO1996019674A1 (fr) 1994-12-21 1995-12-21 Dispositif permettant de limiter le flux volumetrique d'un fluide sous pression

Country Status (4)

Country Link
EP (1) EP0799385B1 (fr)
DE (1) DE59502286D1 (fr)
FI (1) FI112274B (fr)
WO (1) WO1996019674A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3219048A (en) * 1963-05-22 1965-11-23 Palmisano Rosso Richard Vortex flow control valve
FR2356029A1 (fr) * 1976-06-22 1978-01-20 Syred Nicholas Diode a tourbillon
EP0147281A2 (fr) * 1983-12-09 1985-07-03 Novatome Dispositif de régulation du débit d'un courant de fluide dont la pression d'alimentation est variable
DE3520032A1 (de) * 1985-06-04 1986-12-04 Istvàn Oberwil Majoros Vorrichtung zum umwandeln einer fluidstroemung
US5080137A (en) * 1990-12-07 1992-01-14 Adams Thomas R Vortex flow regulators for storm sewer catch basins

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3219048A (en) * 1963-05-22 1965-11-23 Palmisano Rosso Richard Vortex flow control valve
FR2356029A1 (fr) * 1976-06-22 1978-01-20 Syred Nicholas Diode a tourbillon
EP0147281A2 (fr) * 1983-12-09 1985-07-03 Novatome Dispositif de régulation du débit d'un courant de fluide dont la pression d'alimentation est variable
DE3520032A1 (de) * 1985-06-04 1986-12-04 Istvàn Oberwil Majoros Vorrichtung zum umwandeln einer fluidstroemung
US5080137A (en) * 1990-12-07 1992-01-14 Adams Thomas R Vortex flow regulators for storm sewer catch basins

Also Published As

Publication number Publication date
EP0799385B1 (fr) 1998-05-20
DE59502286D1 (de) 1998-06-25
FI972577A0 (fi) 1997-06-17
FI972577A (fi) 1997-06-17
FI112274B (fi) 2003-11-14
EP0799385A1 (fr) 1997-10-08

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