WO2010123905A1 - Fluid mixing system - Google Patents
Fluid mixing system Download PDFInfo
- Publication number
- WO2010123905A1 WO2010123905A1 PCT/US2010/031758 US2010031758W WO2010123905A1 WO 2010123905 A1 WO2010123905 A1 WO 2010123905A1 US 2010031758 W US2010031758 W US 2010031758W WO 2010123905 A1 WO2010123905 A1 WO 2010123905A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tube
- fluid
- conduit
- fluid flow
- exhaust gas
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
Definitions
- Fluid mixing systems have been used in exhaust gas recirculation (EGR) systems since the 1970's to reduce emissions in many gas and diesel engines.
- EGR exhaust gas recirculation
- exhaust gases from an engine are recirculated and combined with gas in an air intake manifold.
- the exhaust gases usually lower the combustion temperature of the fuel below the temperature of formation of nitrogen oxides (NOx) during the combustion process in the cylinders.
- NOx nitrogen oxides
- a fluid mixing system has a first fluid conduit and second fluid conduit in fluid communication with the first fluid conduit.
- the second fluid conduit has a first tube and a second tube, wherein at least one of the first and second tubes causes a swirling or tumbling fluid flow.
- At least one embodiment provides an exhaust gas recirculation system having an air intake conduit and an exhaust gas recirculation conduit that is in fluid communication with the air intake conduit.
- the exhaust gas recirculation conduit causes a swirling or tumbling fluid flow.
- At least one embodiment provides a method of introducing multiple fluids.
- the method includes providing a first fluid flow in a conduit, providing a second fluid flow in a first tube, and providing a third fluid flow in a second tube.
- the second fluid flow is introduced to the first fluid flow at a first entry angle relative to the conduit
- the third fluid flow is introduced to the first fluid flow at a second entry angle relative to the conduit.
- At least one of the first tube and the second tube causes the respective second or third fluid flow to swirl or tumble.
- FIG. 1 is a side perspective view of a prior art exhaust gas recycling system.
- FIG. 2 is a top perspective view of a prior art exhaust gas recycling system.
- FIG. 3 is a side perspective view of a fluid mixing system, in accordance with an exemplary embodiment described herein.
- FIG. 4 is a top perspective view of a fluid mixing system, in accordance with an exemplary embodiment described herein.
- FIG. 5 is a sectional view of a fluid mixing system, in accordance with an exemplary embodiment described herein.
- FIG. 6 is a chart showing pressure pulse charging for an exhaust gas recirculation system in which three recirculation ports have been merged into one port.
- FIG. 7 is a chart showing pressure pulse charging for an exhaust gas recirculation system in which six recirculation ports have been merged into one port.
- the recirculated exhaust gas may be injected into the air intake conduit 130 at two ports, spaced approximately 180 degrees apart. In addition to providing inadequate mixing between the gas systems, this design is very difficult to manufacture.
- the resultant fluid mixture is not uniform, including pockets, zones, regions or strata of higher or lower concentrations of exhaust gases.
- the dispersion of exhaust gas within the air intake gas may be more uneven when the exhaust gases enter on one side of the air intake stream.
- the systems of the exemplary embodiments provide improved fluid mixing.
- the systems of the embodiments have a plurality of tubes that carry fluid to a larger conduit. At least one of the tubes swirls and/or tumbles the fluid flow, providing better mixing of the fluids when in the larger conduit.
- the fluid mixing system may be used to optimize the homogeneity of the fluid mixture. While the exemplary embodiments are described herein with reference to an exhaust gas recirculation system, it will be understood that the systems can be used in other fluid mixing systems.
- an exhaust gas recirculation system 200 includes a plurality of parallel tubes 300 that carry recirculated exhaust gas to an air intake conduit 210.
- Air conduit 210 has air inlet 212 and air outlet 214, with a passageway therebetween.
- Parallel tubes 300 intersect with air conduit between the inlet 212 and outlet 214.
- the conduit 210 may have any suitable shape or cross section, as necessary or desired.
- the conduit 210 may be made of any suitable material such as, for example, aluminum, cast iron, stainless steel, plastic, etc.
- At least one of the tubes 300 provides a swirling or twisting fluid flow. While the embodiments are described herein with reference to two tubes 300, it is understood that more parallel tubes may be provided within the scope of the embodiments. A singular tube 300 is described in more detail below. Where a plurality of parallel tubes (such as 300A, 300B) are described or shown in combination, like reference numerals are used to describe like features.
- the parallel tubes 300 may carry a fluid, such as recycled exhaust gas to the air intake conduit 210.
- one or more of the parallel tubes 300 may carry other fluids instead of or in addition to the recycled exhaust gas.
- each of the tubes 300 may carry the same fluid.
- the tubes 300 may carry different fluids to the conduit 210.
- one tube 300A may carry recycled exhaust gas
- a second tube 300B may carry cold air.
- One or more of the tubes 300 may carry other fluids, such as a power enhancer, or an oxidation- reduction compound, as necessary or desired.
- each parallel tube 300 may have an air inlet 302 and an air outlet 304, and a body 306 extending therebetween.
- the air outlet 304 of the parallel tube 300 leads to the air intake conduit 210, so that the tube 300 is in fluid communication with the conduit 210.
- the tubes 300 may be made of any suitable material such as, for example, aluminum, cast iron, stainless steel, plastic, etc.
- the tubes 300 may be formed so that they are unitary with the conduit 210. In other embodiments, the tubes 300 may be separately formed, and otherwise joined with the conduit 210.
- the tubes 300 may be welded to the conduit 210, the tubes 300 and the conduit 210 may have a corresponding notch/groove or flange assembly that is fastened together, the tubes 300 and the conduit 210 may be press fit together, or adhesively attached together.
- Multiple tubes 300 may be formed together or separately, and joined together or separately with conduit 210. Other methods of joining the tubes 300 and conduit 210 may be used, as necessary or desired, based upon several variables including method of manufacture and packaging.
- each tube 300 may have any suitable length.
- tube 300 may have a length of about 2 inches to about 10 inches measured from the air inlet 302 to the air outlet 304. It will be understood that the length of the tube 300 may be determined as necessary or desired, based upon several variables, including casting size, requirements for engine assembly, etc.
- each tube 300 may have any suitable diameter and cross-sectional shape.
- the diameter and cross-section may be configured to reduce losses, to induce swirling or tumbling, or reduce or increase turbulance.
- Exemplary cross-sections include, for example, circular, oblong, hourglass, J-shape, U-shape, etc., and may include a combination of cross-sectional shapes.
- the cross-section may increase or decrease along the length, as desired or necessary, to reduce or expand the fluids flowing therethrough.
- At least one of the tubes 300 is configured to create a swirling fluid flow.
- at least one of the tubes 300 is twisted to cause a swirling fluid flow.
- at least one of the tubes 300 has internal contours, or structures, baffles, vanes, protrusions, fins, rifling, etc. that cause swirling fluid flow.
- at least one of the tubes 300 is configured to create a tumbling fluid flow.
- at least one of the tubes 300 has internal contours, or structures, baffles, vanes, protrusions, fins, rifling, etc. that cause a tumbling fluid flow.
- the tubes 300 may create swirling or tumbling fluid flow within the tubes 300, and/or may create a swirling tumbling fluid flow after the fluid exits the air outlet 304.
- at least one of the tubes 300 is configured to create a swirling and tumbling fluid flow.
- the tubes 300 are configured to provide a swirling and/or tumbling fluid flow to optimize the homogeneity of the downstream fluid mixture.
- the tube 300 has a twist along its length between the air inlet 302 to the air outlet 304 that causes a swirling fluid flow.
- Tube 300 may have any suitable degree of twisting to provide a swirling fluid flow.
- the degree of twisting of the tubes 300 may affect the mixing efficiency of the EGR system 200.
- the twist in a twisted tube 300 may be from about 15 degrees per inch to about 90 degrees per inch, or from about 30 degrees to about 45 degrees per inch.
- a plurality of tubes 300A, 300B has the same degree of twisting.
- a plurality of tubes 300A, 300B may be twisted about each other.
- one tube 300A may have a higher degree of twisting than the other tube 300B.
- one tube 300A may be straight, and the second tube 300B may be twisted.
- one or more of the tubes 300A, 300B may have one or more geometries that affect the mixing of the fluids by changing the swirl, tumble or recirculation of gases, such as, for example, a bend or fold in the tube 300.
- the conduit 210 may be configured to have one or more structures or geometries that affect the mixing of the fluids by changing the swirl, tumble, and/or recirculation of fluids within the conduit 210.
- the conduit 210 may have any of the swirling and/or tumbling means and devices described herein with reference to the tubes 300.
- each tube 300 terminates at the larger conduit 210, such as, for example, with the air outlet 304 providing a passageway between the tube 300 and the conduit 210.
- one or more of the tubes 300 may terminate at the inner surface of the larger conduit 210. Referring to FIG. 5, in some embodiments, the tubes 300 may terminate beyond the inner surface of the larger conduit 210, so that the air outlet 304 extends into the conduit 210, thereby injecting the recirculated exhaust gas more toward the centerline of the conduit 210.
- each tube 300 may intersect the larger conduit 210 in such a manner as to inject the contents of the smaller tubes 300 into the larger conduit 210 at a predetermined entry angle.
- the "entry angle" is the angle measured between the centerline of the tube 300 and centerline of the larger conduit 210 at the point of intersection, or tangent of the conduit 210 if the conduit 210 is curved at the point of intersection.
- the entry angle of a tube 300 may be suitable angle.
- the entry angle of each twisted tube 300 may be from about 90 degrees to about 45 degrees.
- the entry angle may be oriented in a direction that is perpendicular with, toward the same direction, or toward the opposite direction of the fluid flow direction in the conduit 210.
- the tube 300 may have a bend at or near the outlet 304, to change the direction of flow in the tube 300 just prior to its introduction to the conduit 210.
- each tube 300A, 300B may inject air in a different direction.
- the entry angle of each of the tubes 300A, 300B may be offset from the other to cause a swirling effect, which may further increase the mixing of all fluids.
- the entry angle of tube 300A may be offset from the entry angle of tube 300B by about 30 degrees.
- the tubes 300 may intersect the conduit at any suitable point along the conduit 210.
- two or more tubes 300A, 300B may intersect the conduit 210 at adjacent points.
- two or more tubes 300A, 300B may intersect the conduit 210 on opposite sides of the conduit.
- the respective intersection points of tubes 300A, 300B, and conduit 210 may be configured to provide a predetermined mixing profile.
- a stream of compressed air or other fluid may be introduced at or near the intersection of one or more of the tubes 300, to affect the fluid mixing at that point.
- two or more tubes 300A, 300B may merge into a singular intermediate tube that feeds into the conduit 210. Merging the tubes into an intermediate tube may have an effect on the pressure pulse charging.
- FIG. 6 shows an exemplary pressure pulse charge for a system having three merged streams. In this embodiment, there is a difference between the average pressure (the horizontal line on the chart) and the pressure peaks, which enables the air stream to open and charge the downstream reed valve.
- FIG. 7 shows an exemplary pressure pulse charge for a system having six merged streams. In this embodiment, the difference between the average pressure and the peak pressure is much less, and may be insufficient to open and charge the downstream reed valve.
- the merger of the tubes, and the length of the tubes will be configured as necessary or desired to provide a predetermined pressure pulse charging.
- the tube 300 and/or the air intake conduit 210 may have one or more additional devices, such as nozzles, baffles, fins, and the like, to mix or improve the mixing of the fluids, as necessary or desired.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800232155A CN102439271A (en) | 2009-04-20 | 2010-04-20 | Fluid mixing system |
BRPI1016239A BRPI1016239A2 (en) | 2009-04-20 | 2010-04-20 | fluid mixing system. |
JP2012507318A JP2012524213A (en) | 2009-04-20 | 2010-04-20 | Fluid mixing system |
EP10767642.1A EP2422061A4 (en) | 2009-04-20 | 2010-04-20 | Fluid mixing system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17091409P | 2009-04-20 | 2009-04-20 | |
US61/170,914 | 2009-04-20 | ||
US31734710P | 2010-03-25 | 2010-03-25 | |
US61/317,347 | 2010-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010123905A1 true WO2010123905A1 (en) | 2010-10-28 |
Family
ID=43011437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2010/031758 WO2010123905A1 (en) | 2009-04-20 | 2010-04-20 | Fluid mixing system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2422061A4 (en) |
JP (1) | JP2012524213A (en) |
CN (1) | CN102439271A (en) |
BR (1) | BRPI1016239A2 (en) |
WO (1) | WO2010123905A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013055361A1 (en) * | 2011-10-14 | 2013-04-18 | International Engine Intellectual Property Company, Llc | Egr air-exhaust mixer |
US11041468B2 (en) | 2019-08-07 | 2021-06-22 | Komatsu Ltd. | Mixing connector and engine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101704239B1 (en) * | 2015-07-27 | 2017-02-07 | 현대자동차주식회사 | Device for mixing EGR gas and fresh air |
JP2017180227A (en) * | 2016-03-29 | 2017-10-05 | ヤンマー株式会社 | Engine device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010027784A1 (en) * | 2000-02-17 | 2001-10-11 | Hans-Peter Schmid | Exhaust gas recirculation device |
US20010050070A1 (en) * | 2000-06-13 | 2001-12-13 | Visteon Global Technologies, Inc. | Electronic flow control for a stratified EGR system |
US20030121508A1 (en) * | 2001-12-28 | 2003-07-03 | Klas Jeffrey J. | Intake manifold with improved exhaust gas recirculation |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB350394A (en) * | 1928-12-04 | 1931-05-27 | Carburateurs & App Claudel Sa | Improvements in carbureters |
JPS5137322A (en) * | 1974-09-25 | 1976-03-29 | Toyota Motor Co Ltd | |
JPS5344731A (en) * | 1976-10-04 | 1978-04-21 | Mazda Motor Corp | Exhaust gas recirculating apparatus for engine |
US4223650A (en) * | 1978-08-16 | 1980-09-23 | Sumter Herbert | Exhaust gas recycling system |
US6776146B1 (en) * | 2003-01-27 | 2004-08-17 | International Engine Intellectual Property Company, Llc | Obstruction of flow to improve flow mix |
US7128062B2 (en) * | 2004-07-12 | 2006-10-31 | General Motors Corporation | Method for mid load operation of auto-ignition combustion |
FR2893672B1 (en) * | 2005-11-21 | 2008-02-15 | Renault Sas | INTERNAL COMBUSTION ENGINE WITH INTAKE GAS STRATIFICATION |
-
2010
- 2010-04-20 CN CN2010800232155A patent/CN102439271A/en active Pending
- 2010-04-20 JP JP2012507318A patent/JP2012524213A/en not_active Abandoned
- 2010-04-20 WO PCT/US2010/031758 patent/WO2010123905A1/en active Application Filing
- 2010-04-20 EP EP10767642.1A patent/EP2422061A4/en not_active Withdrawn
- 2010-04-20 BR BRPI1016239A patent/BRPI1016239A2/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20010027784A1 (en) * | 2000-02-17 | 2001-10-11 | Hans-Peter Schmid | Exhaust gas recirculation device |
US20010050070A1 (en) * | 2000-06-13 | 2001-12-13 | Visteon Global Technologies, Inc. | Electronic flow control for a stratified EGR system |
US20030121508A1 (en) * | 2001-12-28 | 2003-07-03 | Klas Jeffrey J. | Intake manifold with improved exhaust gas recirculation |
Non-Patent Citations (1)
Title |
---|
See also references of EP2422061A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013055361A1 (en) * | 2011-10-14 | 2013-04-18 | International Engine Intellectual Property Company, Llc | Egr air-exhaust mixer |
US11041468B2 (en) | 2019-08-07 | 2021-06-22 | Komatsu Ltd. | Mixing connector and engine |
Also Published As
Publication number | Publication date |
---|---|
JP2012524213A (en) | 2012-10-11 |
CN102439271A (en) | 2012-05-02 |
EP2422061A4 (en) | 2014-01-22 |
BRPI1016239A2 (en) | 2016-04-26 |
EP2422061A1 (en) | 2012-02-29 |
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