• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Fluid mixers in the form of venturi tubes suffer from lossy flow separations in the divergent section of the fluid mixer. In order to reduce such flow separations, it is provided that the divergent section (A2) of the Venturi tube (2) has a continuous contour curve with at least two inflection points (W1, W2) in the flow direction.
    公开号:AT511466A4
    申请号:T1125/2011
    申请日:2011-08-03
    公开日:2012-12-15
    发明作者:
    申请人:Hoerbiger Kompressortech Hold；
    IPC主号:
    专利说明:

    816 AT • · · · * * * * * * * * * * * * * * * * *
    4 * 4 * * 4 4 «· * · I
    fluid mixers
    The present invention relates to a fluid mixer in which a first fluid flowing at subsonic speed through a Venturi tube is mixed with a second fluid supplied via admixing ports, wherein in the Venturi tube a first convergent section extending from an inlet cross section to the narrowest cross section of the Venturi tube, and a second divergent section is provided, which extends from the narrowest cross section to the outlet cross section.
    Fluid mixers are used to mix two fluids, e.g. Air and fuel gas for a gas engine to mix in a desired ratio with each other and as homogeneous as possible. Such fluid mixers are generally constructed as venturi tubes and work in the subsonic range at a substantially constant ambient pressure. A first fluid, e.g. Air, the Venturi tube, where the speed of the fluid never reaches the speed of sound. At the narrowest point of the Venturi tube, ie at the point where the dynamic pressure (dynamic pressure) is at its maximum and the static pressure (static pressure) is minimal, a second fluid, such as e.g. Gas or liquid fuel, supplied, However, in the narrowest cross-section is not reached sonic velocity and so it comes in the subsequent divergent part of known dimensions also to a delay of the flow and to increase the static pressure. The divergent nozzle area is particularly sensitive to flow separation due to the delayed flow the flowing fluid mixture. In existing fluid mixers, therefore, a problem is the flow separation in the divergent part of the fluid mixer and concomitant adverse pressure losses.
    Of such working on the Venturi principle fluid mixers Laval nozzles are fundamentally different. A Laval nozzle means a nozzle for accelerating a compressible gas flow from a subsonic to a supersonic state. For the acceleration of a gas in the subsonic area, a narrowing (convergent) contour is needed. The incoming subsonic flow is accelerated in the convergent nozzle part to the narrowest, critical cross-section at the speed of sound and from there in the divergent nozzle part to supersonic speed. This is due to the physical fact that a supersonic flow is accelerated in a diffuser (as opposed to a subsonic flow that is delayed in a diffuser). Thus, there is an accelerated flow throughout the Laval nozzle and the static pressure decreases monotonically with increasing velocity. Flow separations of the gas flowing through are not decisive due to the existing stability of the accelerated flows. The more important effect of supersonic flows in a Laval nozzle is the -1-
    816 AT «» «« · »* * * * • ·« «» * Φ * · Φ «I« · < ··· * · * · so-called compression shock, which is caused by abrupt deceleration of the flow on subsonic conditions and is associated with large losses. Whether such a compression shock occurs in a Lavaldiise, depends solely on the pressure ratio between the nozzle inlet and outlet and the ratio of minimum cross-section to outlet cross-section. Such Laval nozzles are often used as rocket nozzles, whereby so-called Doppelglockengeometrien are known here, on the one hand to prevent the occurrence of Verdi impact shock and on the other hand also form defined demolition edges at which the flow is to tear off at defined conditions in order to maximize all rise heights optimal Laval nozzle available. Here, a stall is thus brought about quite deliberately. Such lavate nozzles are e.g. from EP 862 688 B1, WO 00/34641 A1 or US Pat. No. 3,394,549.
    It is now an object of the subject invention to provide a working according to the venturi fluid mixer, which is less sensitive to flow separation in the divergent part.
    This object is achieved by a fluid mixer in which the divergent section in the flow direction has a continuous contour curve with at least two inflection points. The significant innovation in the field of Venturi nozzles thus consists in the shape of the flow contour in the divergent mixer part. This is optimized so that a flow separation can be avoided or delayed as far as possible and occurring Ablösungsgebiete and thus flow losses can be kept as limited as possible.
    When the admixing opening is displaced from the narrowest cross section into the convergent nozzle area, the propellant gas mass flow of the first fluid, including the admixed mass flow of the second fluid, can advantageously still be against the wall in the accelerated flow, ie in a region from the outside invest. When admixed in the narrowest cross-section with the simultaneous delay of the flow in the divergent mixer part, however, would take place an immediate disadvantageous flow separation by disturbing the near-wall flow due to the admixed fluid mass flow.
    The subject invention will be described below with reference to Figures 1 and 2, which show diagrammatically advantageous embodiments of the invention. It shows
    Fig. 1 shows a cross section through a fluid mixer according to the invention and Fig. 2 is an enlarged view of the curve contour of the venturi tube in the longitudinal direction. -2-
    816 AT
    The fluid mixer 1 according to the invention according to FIG. 1 comprises a Venturi tube 2, which is designed here simultaneously as a housing of the fluid mixer 1. The flow direction through the fluid mixer is indicated by the arrow in Fig. 1. A first fluid, e.g. Air is supplied via an inlet cross section 3 and the fluid mixture discharged through an outlet cross-section 4 from the fluid mixer 1.
    The Venturi tube 2 comprises a first convergent section A1, which extends from the inlet cross section 2 to the narrowest cross section 5 of the Venturi tube 2. The narrowest cross section 5 can also be embodied as a third, cylindrical section A3, as indicated in FIG. 2. "Convergent" here means that the cross-section decreases in the flow direction. Furthermore, the Venturi tube 2 comprises a second divergent section A2 which extends from the narrowest cross section 5 of the Venturi tube 2 to the outlet cross section 4. "Divergent" here means that the cross section increases in the flow direction.
    In Venturi 2 further recess 6 is provided, which is connected to a supply port 7 for a second fluid. The recess 6 is preferably arranged annularly around the inner contour of the Venturi tube 2. In the region of the narrowest cross section (or the third section A3) are distributed over the circumference a number of admixing openings 8 are provided with the recess 6 and thus with the feed opening 7 is connected. The admixing openings 8 are advantageously arranged in the region of the first convergent section A1, that is to say in the flow direction in front of the narrowest cross section 5 or in front of the third section A3. However, the admixing openings 8 could also be arranged at the narrowest cross-section 5.
    The inner flow contour of the Venturi tube 2 in the flow direction is shown in detail in FIG. The flow contour of the divergent section A2 has two inflection points W1 and W2, the contour curve being continuous. Individual divergent subsections of the divergent section A2 could also be approximated by a straight line, but the divergent section A2 as a whole must remain continuous. A curve is continuous in the sense of the invention if it has only one tangent at each point. The inflection point here is a point on a curve in which the curve changes its curvature behavior as it changes from a left-hander to a right-hander. This results in a double-divergent second section A2. -3-
    权利要求:
    Claims (2)
    [1]
    1. A fluid mixer in which a first fluid flowing at a subsonic speed through a Venturi tube (2) is connected to a second, via admixing openings (8) supplied fluid 5 is mixed, wherein in Venturi tube (2) has a first convergent portion (A1) extending from an inlet cross-section (3) to the narrowest cross-section (5) of the Venturi tube (2), and a second divergent section (A2) is provided, which extends from the narrowest cross section (5) to the outlet cross section (4), characterized in that the divergent section (A2) in the flow direction has a continuous contour curve with at least two turning points (W1, W2).
    [2]
    2. fluid mixer according to claim 1, characterized in that the admixing openings (8) in the region of the first section (A1) in the Venturi tube (2) open. -4-
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE102012013399A1|2013-02-07|
    US20130032223A1|2013-02-07|
    AT511466B1|2012-12-15|
    US9295952B2|2016-03-29|
    CN102908919A|2013-02-06|
    CN102908919B|2016-05-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3394549A|1965-07-06|1968-07-30|North American Rockwell|Step nozzle|
    EP0862688A1|1996-09-23|1998-09-09|Volvo Aero Corporation|Controlled temperature rocket nozzle|
    WO2000034641A1|1998-12-04|2000-06-15|Volvo Aero Corporation|Rocket nozzle contour for flow separation control and side load reduction|
    US4123800A|1977-05-18|1978-10-31|Mazzei Angelo L|Mixer-injector|
    SU1404101A1|1986-11-27|1988-06-23|Предприятие П/Я М-5332|Mixer|
    WO1993012043A1|1991-12-09|1993-06-24|U.S. Water Technologies, Inc.|Low pressure process for entraining gas into liquid solution|
    CN2239841Y|1995-04-03|1996-11-13|安赫洛·马塞|Mixed injector|
    CN1080823C|1996-09-23|2002-03-13|沃尔沃航空有限公司|Controlled temperature rocket nozzle|
    AUPO566097A0|1997-03-17|1997-04-10|Browne, John Phillip|Fluid mixer and water oxygenator incorporating same|
    US20020096792A1|2000-11-29|2002-07-25|Vince Valela|Oxygenation device|
    FR2839269B1|2002-05-06|2004-07-09|Inst Francais Du Petrole|IMPROVED DEVICE FOR INJECTING HYDROCARBONS INTO A FLUIDIZED ENCLOSURE|
    AT502016B1|2005-08-24|2007-01-15|Diehl Hans Juergen|SWIRL CHAMBER|
    CN101621502A|2008-06-30|2010-01-06|华为技术有限公司|Method and device for storing and searching routing table|
    US20090324429A1|2008-06-30|2009-12-31|Philip Azimov|Static fluid mixing pump device|
    AT511466B1|2011-08-03|2012-12-15|Hoerbiger Kompressortech Hold|FLUID MIXER|
    AT513460B1|2012-10-12|2014-09-15|Hoerbiger Kompressortech Hold|Fluid mixer with drive|IT1404264B1|2011-01-28|2013-11-15|Zambon|VALVE GROUP, PARTICULARLY FOR USE IN PNEUMATIC NETWORKS|
    AT511466B1|2011-08-03|2012-12-15|Hoerbiger Kompressortech Hold|FLUID MIXER|
    US10625221B2|2016-08-11|2020-04-21|Evan Schneider|Venturi device|
    CN107328446B|2017-07-13|2019-10-22|天津大学|A kind of flux of moisture measuring device|
    法律状态:
    2013-03-15| HA| Change or addition of new inventor|Inventor name: MATTHISAS DR. KORNFELD, AT Effective date: 20130214 Inventor name: PETER DR. DOLOVAI, AT Effective date: 20130214 Inventor name: TINO DR. LINDNER-SILWESTER, AT Effective date: 20130214 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1125/2011A|AT511466B1|2011-08-03|2011-08-03|FLUID MIXER|ATA1125/2011A| AT511466B1|2011-08-03|2011-08-03|FLUID MIXER|
    DE201210013399| DE102012013399A1|2011-08-03|2012-07-05|fluid mixers|
    US13/561,639| US9295952B2|2011-08-03|2012-07-30|Venturi tube fluid mixer with at least two inflection points in the divergent section|
    CN201210274512.8A| CN102908919B|2011-08-03|2012-08-03|Flow mixer|
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