WO2020126062A1 - Appareil de réduction de traînée pour un véhicule et procédé pour réduire la traînée d'un véhicule - Google Patents

Appareil de réduction de traînée pour un véhicule et procédé pour réduire la traînée d'un véhicule Download PDF

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Publication number
WO2020126062A1
WO2020126062A1 PCT/EP2019/000287 EP2019000287W WO2020126062A1 WO 2020126062 A1 WO2020126062 A1 WO 2020126062A1 EP 2019000287 W EP2019000287 W EP 2019000287W WO 2020126062 A1 WO2020126062 A1 WO 2020126062A1
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WO
WIPO (PCT)
Prior art keywords
fluid
vehicle
component
section
pressure
Prior art date
Application number
PCT/EP2019/000287
Other languages
English (en)
Inventor
Tanuj Singh
Roland Lessmeister
Original Assignee
Psa Automobiles Sa
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 Psa Automobiles Sa filed Critical Psa Automobiles Sa
Priority to EP19786266.7A priority Critical patent/EP3898391A1/fr
Priority to CN201980083636.8A priority patent/CN113195345A/zh
Publication of WO2020126062A1 publication Critical patent/WO2020126062A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D35/00—Vehicle bodies characterised by streamlining

Definitions

  • the invention relates to a drag reducing apparatus for a vehicle and a method for reducing drag of a vehicle.
  • Aerodynamic drag in particular aerodynamic drag, is created whenever a vehicle travels at speed. Aerodynamic drag is comprised of two principle components - skin friction drag and form drag. The effects of flow separation, in particular of the boundary layer, accounts for 45% of the total vehicle resistance.
  • a drag reducing apparatus for a vehicle is known by US 9,193.399 B2, which provides an active and passive boundary layer control system to keep the boundary layer flow attached to the surface of a component of a vehicle.
  • An Object of an embodiment of the invention is to provide a drag reducing apparatus for vehicle and a method for reducing drag of a vehicle, with wich the drag can be further reduced.
  • the task is solved by a drag reducing apparatus for a vehicle, in particular a land vehicle, a water craft or aircraft, comprising at least one fluid guide channel with an fluid inlet, by which fluid can stream in a compression section of the fluid guide channel, with an exhaust section, having a fluid outlet, which has in particular a nozzle-like structure and by which the fluid can stream to the rear end of the vehicle, and with a pressure build-up section, which is located between the compression section and the exhaust section, and comprising at least one pressure build-up device, which is arranged in the pressure build-up section and by which the total pressure of the fluid from the compression section can be increased and the fluid can be guided to the exhaust section, wherein the fluid guide channel is arranged or locatable in or on a vehicle component.
  • the total pressure in the rear end of a vehicle can be increased.
  • the drag of the vehicle is decreased.
  • the pressure of the fluid passing the fluid guide channel can be further increased, which also increases the effect of reducing the drag of the vehicle.
  • the drag reducing apparatus By arranging the fluid guide channel in or on a vehicle component, the drag reducing apparatus can be integrated to a component of the vehicle that exists anyway. Therefore, components of the vehicle are effectively used.
  • Total pressure comprises a static pressure component and a dynamic pressure component. Outside the fluid guide channel the total pressure is constant. Only the amount of the static pressure component and dynamic pressure component are varying.
  • the proposed drag reducing apparatus accelerates the fluid flow by introducing energy by using the pressure build-up device. Doing so, it is possible to introduce energy to specific areas of the rear end of the vehicle reduce turbulence and stagnation pressure, smoothen the airflow around the vehicle and to improve the airflow separation at rear.
  • the compression section and/or the exhaust section has/have a funnel like cross-section, each having its smallest width at its side facing the pressure build-up section. Because the compression section has a funnel like cross-section, having its smallest width at its side facing the pressure build-up section, the velocity of the fluid flowing in direction to the build-up device increases. It is the other way around for the exhaust section, in which the velocity of the fluid decreases from build-up device in direction to the fluid outlet.
  • the decrease of velocity in the exhaust section from the pressure build-up device in direction to the fluid outlet can be reduced, if the thickness of the exhaust section becomes smaller in direction from the pressure build-up device to the fluid outlet.
  • the at least one pressure build-up device can be realized by any device, having the technical function to increase the pressure of fluid.
  • the pressure build-up device can be realized easily, if the least one pressure build-up device comprises a compressor, a turbocharger, a supercharger and/or a designated blower.
  • the fluid inlet, the compression section, the exhaust section and/or the fluid outlet has/have a fixed or adjustable cross-section.
  • the apparatus can be realized easy and inexpensive.
  • the fluid inlet, the compression section, the exhaust section and/or the fluid outlet have an adjustable cross-section, the fluid velocity and the total pressure components can be adjusted easily.
  • the stream of the fluid can be easily adjusted, if the fluid inlet and/or the fluid outlet provide an adjustment body to at least adjust the streaming direction of the fluid and/or if the fluid inlet and/or the fluid outlet provide a drive element to move the adjustment body from a first position, in which the fluid streams in a first direction, to a second position, in which the fluid streams in a second direction.
  • the fluid inlet and/or the fluid outlet comprises at least one opening, which is aligned in, transversely or obliquely to the direction of travel. ln case the fluid inlet comprises at least one opening, that is aligned in direction of travel, the velocity of the fluid stream inside the compression section
  • the kinetic energy of the vehicle can be used at least partly to drive the apparatus.
  • the apparatus provides a boundary layer suction device, which is arranged at or in the surface of the vehicle component and which is built by the fluid inlet, comprising a plurality of openings, which are aligned transversely or obliquely to the direction of travel.
  • the apparatus can be built component reduced.
  • the boundary layer suction device the boundary layer surrounding the surface of the component can partly be controlled to prevent boundary layer separation to further reduce the drag of the vehicle.
  • the fluid inlet and/or the fluid outlet provide at least one closure device, which can be driven from an open position, in which fluid is approved to stream inside the fluid inlet and/or outside the fluid outlet, to an close position, in which fluid is prevented to stream inside the fluid inlet and/or outside the fluid outlet, an/or to a plurality of intermediate positions, in which the cross-section of the fluid inlet and/or fluid outlet is reduced compared to the open position.
  • Providing a closure device it is possible to stop the fluid stream of the apparatus by closing the closure device. Further, by arranging the closer device in intermediate positions, the mass flow of the fluid can be controlled easily.
  • At least one of the at least one fluid guide channel is unsolvable attached to the vehicle component, in particular being a one-piece structure of the component or being glued, welded, soldered and / or riveted to the component, and/or at least one of the at least one fluid guide channel is releasably attached to the vehicle component, in particular form-fitted, force-fitted, clipsed and/or screwed attached.
  • the apparatus and the vehicle component can be one part, in which the different sections of the fluid guide channel are formed by a structure of the vehicle component. If the vehicle component is built by molding or injection molding, said structure can be provided by injection molding process.
  • the apparatus in particular the fluid guide channel
  • the fluid guide channel is unsolvable attached to the vehicle component, a compact structure can be reached.
  • the fluid guide channel is releasably attached the vehicle component, it easily can be changed or removed.
  • At least one control unit to control at least the drive element, closure device and/or the pressure build-up device.
  • the pressure build-up device can easily be controlled by the control unit.
  • closure device and/or the drive element can be easily adjusted by the control unit.
  • the apparatus comprises at least one sensor arranged at the rear end of the vehicle, by which at least the total pressure, the static pressure component and/or the dynamic pressure component can be detected and which is functionally assigned to the control unit.
  • control unit comprises a storing device in which predetermine or predefinable all total pressure, static pressure component and/or dynamic pressure component can be saved and compared by the control unit, when the apparatus is driven. Therefore, the power of the pressure build-up device can be increased if the detected pressure is to low or decreased, if the detected pressure is too high. Further, the closure device and/or the adjustment body can be adjusted to control for mas flow and/or the direction of streaming.
  • the apparatus provides at least two fluid guide channels, which are being arranged or locatable in or at the same or in or at different vehicle components.
  • Said at least two fluid guide channels can be attached in the same vehicle component or in different vehicle components.
  • one fluid guide channel is attached to roof top of the vehicle and one fluid guide channel is attached to a vehicle floor.
  • at least two fluid guide channels are attached to the same vehicle component, in particular parallel to each other.
  • the vehicle component comprises a Vehicle roof, vehicle floor and / or side wall and/or wherein the fluid comprises air.
  • the task could also be solved by a method of reducing drag of a vehicle by using a drag reducing apparatus for a vehicle according with at least one of the described features, comprising the steps: a. Possibly driving the open device from the close position in the open position or an intermediate position; b. Driving the pressure build-up device to provide a predetermined or predefinable total pressure, static pressure component and/or dynamic pressure component at the fluid outlet; c. Detecting the total pressure, static pressure component and/or
  • Figure 1 A schematic symmetric view of a first embodiment of the apparatus
  • Figure 2 A sectional view through the line AA of figure 1 ;
  • Figure 3 A sectional top view of the apparatus according to figure 1 ;
  • FIG. 4 A detailed view of the fluid inlet and compression section of the
  • FIG. 5 A detailed view of the fluid outlet and exhaustion section of the
  • Figure 6a A detailed sectional view of the fluid outlet through the line BB with an adjustment body in a first position
  • Figure 6b A detailed sectional view of the fluid outlet through the line BB with an adjustment body in a second position
  • Figure 7 A schematic symmetric view of a second embodiment of the apparatus
  • Figure 8 A schematic flow chart of a method according to the invention.
  • the Figures show embodiments and parts of a drag reducing apparatus 2 for a vehicle 4.
  • the vehicle 4, shown in the figures, comprises a land vehicle.
  • the drag reducing apparatus 2 comprises at least von fluid guide channel 6, which has a fluid inlet 8 by which fluid can stream from outside of the vehicle in a compression section 10 of the fluid guide channel 6.
  • the fluid guide channel 6 also comprises an exhaust section 12, having a fluid outlet 14, which has in particular nozzle-like structure by which the fluid can stream to the rear end of the vehicle 6.
  • the fluid guide channel 6 comprises a pressure build-up area 16, which is located between the compression section 10 and the exhaust section 12.
  • the apparatus 2 further comprises at least one pressure build-up device 18, which is arranged in the pressure build-up section 16 and by which the total pressure of the fluid from the compression section 10 can be increased and the fluid can be guided to the exhaust section 12.
  • the drag reducing apparatus 2 is arranged in a vehicle component 20.
  • the vehicle component 20 comprises a vehicle roof.
  • the compression section 10 and the exhaust section 12 comprise a funnel like cross-section, each having its smallest width at its side facing the pressure build-up section 16.
  • Figure 2 shows a section view of the apparatus 2 in direction of cut AA according to figure 1.
  • the fluid entering the compression section 10 by the fluid inlet 8 increases its velocity, caused by the funnel like cross-section of the compression section 10.
  • the thickness of the compression section 10 is nearly equal over its extension from the fluid inlet 8 to the pressure build-up section 16.
  • the velocity of the fluid decreases within the exhaust section 12, caused by the funnel like cross-section of the exhaust section 12.
  • the effect is reduced by decreasing the thickness of the exhaust section 12 in its direction from the pressure build-up section 16 to the fluid outlet 14.
  • an adjustment body 22 is provided to adjust the streaming direction of the fluid.
  • the apparatus 2 provides a drive element 24 to move the adjustment body 22 from a first position, in which the fluid streams in a first direction, to a second position, in which the fluid streams in a second direction.
  • fluid inlet 8 and the fluid outlet 14 provide openings 26, which are aligned in direction of travel.
  • the embodiments shown in the figures provide an apparatus 2, having a fluid guide channel 6, which is unsolvable attached to the vehicle component 20.
  • Figures 6a and 6b show a section view of the apparatus 2 in direction of cut BB according to figure 5.
  • the fluid outlet 14 is nozzle-like shaped and the opening 26 can be increased or decreased. By increasing the opening 26, the static pressure of the fluid increases while the dynamic pressure decreases.
  • Figure 7 shows a second embodiment of the drag reducing apparatus 2.
  • two fluid guide channels 6 are arranged inside the same vehicle component 20 of the vehicle 4 and are extending parallel to each other.
  • the embodiments shown in the figures comprise a sensor 28, which is arranged at the rear end of the vehicle 4 and which can detect total pressure, the static pressure component and/or the dynamic pressure component of the total pressure.
  • the sensor 28 is functionally assigned to a control unit 30, which can control at least the drive element 24 to adjust the adjustment body 22 and the pressure build-up device 18 to adjust the power of the pressure build-up device 18.
  • FIG. 8 shows a schematic flow chart of a method according to the invention. Which reference to figures 1 to 7, the method will be described in the following:
  • an open device (not shown in the figures) can be driven from a closed position in an open position or in an intermediate position, which is located between the closed position and the open position.
  • the step 100 is possible to do and not necessary.
  • Step 100 could be not necessary to do in case the open device is already in the intermediate position or in the open position.
  • the fluid inlet 8 is open for the fluid surrounding the vehicle to stream inside the fluid guide channel 6.
  • the fluid first passes the compression section 10 and increases its velocity, caused by the funnel like cross- section of the compression section 10. After passing the compression section 10, the fluid arrives in the pressure build-up area 16. After passing said pressure buildup section 16, the fluid passes the exhaust-section 12 and streams to the fluid outlet 14. Streaming outside the fluid outlet 14, the fluid arrives at the rear end of the vehicle 4 and influences the total pressure in the rear end area of the vehicle 4 to decrease drag of the vehicle 4.
  • the apparatus 2 comprises the sensor 28, which functionally is assigned to the control unit 30.
  • the total pressure, static pressure, component and/or dynamic pressure component can be detected at the rear end of a vehicle by the sensor.
  • the control unit 30 increases the power of the pressure build-up device 18, if the detected total pressure, static pressure, component and/or dynamic pressure component is below the predetermined or predefinable total pressure, static pressure, component and/or dynamic pressure component.
  • the control unit decreases the power of the pressure build-up device 18, if the detected total pressure, static pressure component and/or dynamic pressure component is over the predetermined or predefinable total pressure, static pressure, component and/or dynamic pressure component.

Abstract

L'invention concerne un appareil de réduction de traînée (2) pour un véhicule (4), en particulier un véhicule terrestre, un engin nautique ou un aéronef, lequel appareil comprend au moins un canal de guidage de fluide (6) avec une entrée de fluide (8), par laquelle un fluide peut circuler dans une section de compression (10) du canal de guidage de fluide (6), avec une section d'échappement (12), ayant une sortie de fluide (14), qui a en particulier une structure du type buse et par laquelle le fluide peut circuler vers l'extrémité arrière du véhicule (4), et une section d'accumulation de pression (16), qui est située entre la section de compression (10) et la section d'échappement (12), et comprenant au moins un dispositif d'accumulation de pression (18), qui est disposé dans la section d'accumulation de pression (16) et par lequel la pression totale du fluide venant de la section de compression (10) peut être accrue et le fluide peut être guidé vers la section d'échappement (12), le canal de guidage de fluide (6) étant disposé ou pouvant être disposé dans ou sur un composant de véhicule (20).
PCT/EP2019/000287 2018-12-17 2019-10-04 Appareil de réduction de traînée pour un véhicule et procédé pour réduire la traînée d'un véhicule WO2020126062A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19786266.7A EP3898391A1 (fr) 2018-12-17 2019-10-04 Appareil de réduction de traînée pour un véhicule et procédé pour réduire la traînée d'un véhicule
CN201980083636.8A CN113195345A (zh) 2018-12-17 2019-10-04 运输工具的阻力减小设备和用于减小运输工具阻力的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018221976.1A DE102018221976A1 (de) 2018-12-17 2018-12-17 Luftwiderstandsverringerungseinrichtung für ein Fahrzeug und Verfahren zum Verringern des Luftwiderstands eines Fahrzeugs
DE102018221976.1 2018-12-17

Publications (1)

Publication Number Publication Date
WO2020126062A1 true WO2020126062A1 (fr) 2020-06-25

Family

ID=68208260

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/000287 WO2020126062A1 (fr) 2018-12-17 2019-10-04 Appareil de réduction de traînée pour un véhicule et procédé pour réduire la traînée d'un véhicule

Country Status (5)

Country Link
EP (1) EP3898391A1 (fr)
CN (1) CN113195345A (fr)
DE (1) DE102018221976A1 (fr)
MA (1) MA54495A (fr)
WO (1) WO2020126062A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613682A1 (fr) * 1987-04-10 1988-10-14 Faux Guy Dispositif permettant aux vehicules d'ameliorer la penetration dans l'air (correction du cx)
US6779834B1 (en) * 2003-09-10 2004-08-24 Russell D. Keller Drag reduction channel apparatus for roadway vehicles
US20070187990A1 (en) * 2004-07-01 2007-08-16 Khosrow Shahbazi Aerodynamic drag reduction systems
US9193399B2 (en) 2013-10-18 2015-11-24 Peter Schmidt Active and passive boundary layer control for vehicle drag reduction

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US2037942A (en) * 1935-10-28 1936-04-21 Edward A Stalker Means of reducing the fluid resistance of propelled vehicles
FR2616403A1 (fr) * 1987-06-12 1988-12-16 Heuliez Henri France Design Vehicule roulant a dispositif de refroidissement par air
DE3837729A1 (de) * 1988-11-07 1990-05-10 Dieter Prof Dr Ing Geropp Verfahren und vorrichtung zum reduzieren des stroemungswiderstandes im heckbereich eines fahrzeugs, z. b. eines strassen- oder schienenfahrzeugs oder dergleichen
SU1752636A1 (ru) * 1990-04-25 1992-08-07 С. А. Мохов Транспортное средство с аэродинамическим устройством
DE102004055682A1 (de) * 2004-11-18 2006-05-24 Dr.Ing.H.C. F. Porsche Ag Bug für einen Personenkraftwagen
DE102010036440B4 (de) * 2010-07-16 2024-03-28 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kühlluftführung für ein Kraftfahrzeug
FR3022878B1 (fr) * 2014-06-27 2018-04-13 Compagnie Plastic Omnium Face avant de vehicule automobile avec entree d'air centrale et sorties laterales
GB2531290B (en) * 2014-10-14 2021-05-26 Aston Martin Lagonda Ltd Vehicle airflow control apparatus
GB201505104D0 (en) * 2015-03-26 2015-05-06 Fleming James G A drag reduction system for vehicles
CN206501919U (zh) * 2016-11-08 2017-09-19 热流动力能源科技股份有限公司 车厢分流增压减阻装置
US10029746B2 (en) * 2016-12-15 2018-07-24 GM Global Technology Operations LLC Downforce generating duct for a vehicle
CN108162995B (zh) * 2017-12-22 2020-03-06 南京航空航天大学 一种空气导流装置及利用其减小空气压差阻力的方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613682A1 (fr) * 1987-04-10 1988-10-14 Faux Guy Dispositif permettant aux vehicules d'ameliorer la penetration dans l'air (correction du cx)
US6779834B1 (en) * 2003-09-10 2004-08-24 Russell D. Keller Drag reduction channel apparatus for roadway vehicles
US20070187990A1 (en) * 2004-07-01 2007-08-16 Khosrow Shahbazi Aerodynamic drag reduction systems
US9193399B2 (en) 2013-10-18 2015-11-24 Peter Schmidt Active and passive boundary layer control for vehicle drag reduction

Also Published As

Publication number Publication date
MA54495A (fr) 2022-03-23
EP3898391A1 (fr) 2021-10-27
CN113195345A (zh) 2021-07-30
DE102018221976A1 (de) 2020-06-18

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