DE202021104499U1 - Device for generating energy from airflow on a ground-based vehicle and use - Google Patents

Abstract

Device (10) for generating energy from the airstream on a ground-based vehicle (1), with at least one rotor (11) with several rotor blades (11.1) mounted about a rotor axis (X11) and coupled to a generator (16) of the device (10) ), and with at least one flow guide means (12) arranged upstream of the rotor (11), and with a vestibule (13) surrounding the rotor, and with at least one flow guide means (17) arranged downstream of the rotor; characterized in that the rotor axis (X11) is aligned at least approximately in the direction of travel (x), the device being set up and designed for an arrangement of at least the rotor (11) in the area of a vehicle front (3) and in the area of a vehicle floor (5) , in particular on the front side of the vehicle and with the downstream flow guide means (17) with an outlet-side opening (17a) to the floor.

Description

TECHNICAL AREA

The present invention relates to a device for generating energy from the airstream on a ground / ground vehicle, with at least one rotor mounted around a rotor axis and coupled to a generator of the device with a plurality of rotor blades, and with at least one flow guide means arranged upstream of the rotor, and with a vestibule surrounding the rotor, and with at least one flow guide means arranged downstream of the rotor. Furthermore, the present invention also relates to uses of such components in connection with a method for generating energy from airflow in a ground-based vehicle, in particular by means of such a device. Last but not least, the present invention also relates to the use or provision of a flow path which is defined by at least one flow guide means arranged upstream of a rotor and by a vestibule surrounding the rotor and by at least one flow guide means arranged downstream of the rotor and from a vehicle front to an underbody of the vehicle leads to the provision of an energy-efficient generator device. In particular, the invention relates to a device and a use according to the preamble of the respective independent claim.

BACKGROUND OF THE INVENTION

In the case of ground-based vehicles, an electrical energy supply is particularly important for current vehicle types. In the case of electric vehicles, too, there is interest in a reliable energy supply on the one hand, but also in particularly good energy efficiency on the other. Particularly in vehicles in which an internal combustion engine no longer has to be installed, there are new possibilities to use installation space in the front area of the vehicle (i.e. in the front, in particular in an area that corresponds to the so-called crumple zone or the bonnet in conventional vehicles) .

The idea of using the head wind for wind-driven rotors to generate energy is not new. According to the prior art, there are already numerous attempts to install devices for wind-powered electricity generation on earthbound vehicles, but these usually require a certain installation situation or a comparatively large amount of space, for example on the roof of the vehicle, as in the publications EP 2 333 324 A2 and DE 10 2009 015 815 A1 described. However, there is still interest in improved energy efficiency, which should also be able to be achieved with comparatively simple and compact devices. The present invention is accordingly specifically directed to an arrangement of the device according to the invention in the case of comparatively cramped space conditions in the frontal area below or below a body component usually referred to as a hood.

The publication DE 10 2007 054 789 A1 which describes an arrangement of two rotor axles aligned at least approximately horizontally transversely to the direction of travel in an arrangement in front of a radiator of a vehicle. The following other publications can also be named as examples: DE 10 2018 130 609 A1 describes a flow collector arranged upstream of a generator with flow guide means for optimizing the air flow directed onto the generator, whereby a good degree of efficiency is to be achieved. EP 1 108 890 B1 describes an air duct from the radiator area below a bumper (in the manner of an underfloor air inlet) to behind the front wheels, where the air is directed to several rotors mounted on an axle that is oriented transversely to the direction of travel. Even DE 10 2009 056 309 A1 describes an underfloor air inlet for a wind generator, or alternatively an arrangement of the generator on a roof of the vehicle.

Based on the state of the art, however, there is still a need for an advantageous and energetically effective arrangement and design of a wind generator in a ground-based vehicle, in particular in such a way that the usual shape or construction of the vehicle by the wind generator and any further components in this regard, if possible, not at all or is only minimally affected or has to be changed, in particular with regard to a retrofit option for vehicles already approved for use on the road.

SUMMARY OF THE INVENTION

The object is to provide a device for generating energy from the headwind on a ground-based vehicle, by means of which the headwind energy can be used in a particularly simple and energy-efficient manner. It is also an object to design such a device in such a way that its implementation in the ground-based vehicle can be implemented in a particularly elegant manner. Last but not least, the object is to provide such a device in such a way that the device enables energy to be obtained from the airstream in a particularly simple and (energy) efficient manner, even in the event that in one corresponding vehicle only comparatively little space is available.

This object is achieved by a device according to claim 1 and by a use according to the independent use claim. Advantageous further developments of the invention are explained in the respective subclaims. The features of the exemplary embodiments described below can be combined with one another, unless this is explicitly denied.

A device is provided for generating energy from headwind on a ground-based vehicle, with at least one rotor mounted around a rotor axis and coupled to a generator of the device, with a plurality of rotor blades, and with at least one flow guide means arranged upstream of the rotor, and with one surrounding the rotor Windscreen, and with at least one flow guide means arranged downstream of the rotor. According to the invention, it is proposed that the rotor axis is at least approximately aligned in the direction of travel, the device being set up and designed for an arrangement of at least the rotor in the area of a vehicle front and in the area of a vehicle floor, in particular on the front side of the vehicle and with the flow guide means arranged downstream outlet opening to the floor. Among other things, this provides a good compromise between the complexity of the device and the optimization of the flow, in particular thanks to the advantageous relative arrangement in the vehicle. The floor coupling of the flow outlet according to the invention can ensure a noticeable increase in efficiency, particularly even at higher driving speeds.

Personified terms, insofar as they are not formulated in the neuter, can apply to all genders within the scope of the present disclosure.

Optionally, the device can also be designed to be scalable in terms of size and / or number of individual components, in particular with regard to the number of rotors, which for example (preferably) can be designed redundantly in the horizontal direction (at least one generator, several rotors), in particular in each case in the same Can be arranged height position relative to the underbody of the vehicle (namely, if possible, comparatively far below). Last but not least, this also enables a further optimization of the energy yield with regard to confined spaces and can also achieve a good fluidic coupling between the front of the vehicle and the greatest dynamic pressure on the one hand and the underbody and thus, depending on the design of the vehicle, a noticeable negative pressure and thus a suction effect that has a positive effect on throughput on the other to ensure. In this respect, the relative arrangement of the flow path according to the invention also enables good fluidic communication between the front (pressure side) and discharge side (in particular negative pressure side), in terms of fluid pressure optimization. For example, the entire front of the vehicle can be equipped with rotors transversely to the direction of travel in a horizontal plane, provided that the structural design of the respective front of the vehicle allows this (provided that there are no spatial conflicts with other essential or even more important vehicle components).

Optionally, individual components of the device can also be switched on / off, in particular as a function of at least one driving parameter, in particular as a function of the driving speed. For example, the individual components of the device, in particular a respective rotor and the generator, are connected to one another by means of a control / regulating unit and optionally also coupled to a control / regulating unit of the vehicle. In this way, not least, the way in which the energy is supplied can also be controlled / regulated in a driving situation-specific manner by means of a control unit of the vehicle, for example with regard to an energy supply that is as constant as possible.

According to one embodiment, at least one transmission is provided between the rotor axis and the generator, in particular comprising at least two interacting wheels. Last but not least, this also enables size ratios, rotational speeds and / or performance indicators to be individually adapted, in particular depending on an expected main operating mode of the vehicle (e.g. when driving on the motorway, it is designed differently than when primarily used for city traffic).

According to one embodiment, the at least one flow guide means arranged upstream of the rotor is designed as a funnel, in particular with an opening angle of more than 30 °, in particular up to 45 °, in particular with a longitudinal extension of at least 1 to 2 times the longitudinal extension of the rotor. In particular in connection with rotors that are comparatively small in diameter, this can lead to a compression and homogenization (homogenization) of the supplied air and advantageously influence the efficiency.

According to one exemplary embodiment, the at least one flow guide means arranged downstream of the rotor is designed as a bottom-directed discharge line, in particular with an outlet-side opening directed at an angle of inclination rearward to the rear and to the bottom, in particular with the angle of inclination in the range from 30 ° to 45 ° relative to the horizontal plane. Last but not least, this also provides an advantageous course of the flow path and can optimize the flow efficiency.

According to one exemplary embodiment, the at least one flow guide means arranged downstream of the rotor adjoins, on the outlet side, flush with a / the underbody plate of the vehicle. This can bring about an advantageous mixing of the two air masses, especially in the transition area between the diverted flow and air flowing past the underbody, in particular in such a way that a withdrawal of the flow from the device is fluidically supported, in the sense of a suction effect.

According to one embodiment, the flow path of the air guided onto the rotor (in particular the amount of air / ambient air caused by the airflow) and the air diverted from the rotor is only curved downwards in the direction of the ground (only negative curvature downwards, not upwards). Last but not least, such a course of the flow also provides the advantage of a sustainable handling of the energy and momentum content of the flow for the most efficient possible use of the flow energy for generating electrical energy.

According to one embodiment, the flow path of the air passed through the device only experiences a downward change in direction, in particular in that the flow path from the rotor is initially guided axially at least approximately horizontally and is then guided under an underbody plate of the vehicle. This also makes it possible, starting from the front of the vehicle, to provide the air flow, which is to be guided around the vehicle anyway, without great power / friction losses for the generation of energy. Particularly at high driving speeds, a good compromise can be achieved between possibly additionally justified driving resistance (in particular any greater resistance compared to a flow around the vehicle without being passed over rotors) and energetic advantage.

According to one exemplary embodiment, the cross section predetermined by the device for the air along the flow path is round, in particular circular, in particular with at least approximately cylindrical or conical sections along the flow path. This allows the flow situation to be further optimized.

According to one embodiment, the rotor has four to 16 blades, in particular six to ten blades, preferably eight blades. This also provides an advantageously efficient rotor.

According to one embodiment, the axial extent of the rotor is many times smaller than the axial extent of the vestibule, in particular by a factor of three to ten, preferably by a factor of five to eight. This can also contribute to an advantageous fluidic situation.

According to one exemplary embodiment, the device is set up to generate energy exclusively by means of ambient air from the airstream, without system air or other technical media of the vehicle. This increases the system independence and autonomy of the device according to the invention even further, in particular also with regard to a retrofit option.

According to one exemplary embodiment, the rotor axis is mounted in bearings that are arranged externally from system-internal components of the vehicle, in particular accessible from the outside without exceeding a system limit to components arranged internally in the vehicle. Last but not least, this also facilitates retrofitting and also promotes simple maintenance. The device can also be operated or used largely independently of weather / weather conditions, in particular since a system boundary is not broken internally to the vehicle, at least not in mechanical terms (possibly via a data / energy coupling).

According to one embodiment, the upstream flow guide means and / or the rotor is only separated from the underbody of the vehicle by a flow island, the flow island being designed to be comparatively low in height, in particular as high as the rotor or even significantly smaller than the rotor. This arrangement relative to the underbody also provides a good compromise with regard to the optionally realizable rotor diameter and with regard to any competing space / installation space requirements of other components such as z .B. a camera / radar system for autonomous driving or the like. The entire device can largely be provided in the area of the underbody, in particular also in a height position below a bumper of the vehicle. This also contributes to an advantageously low-friction flow path with only a few / weak deflections and with good coupling to an underbody flow.

The aforementioned object is also achieved by a grounded vehicle with at least one previously described above Device, in particular by a two-, three- or four-wheeled electric vehicle with such a device. This results in the aforementioned advantages, in particular with regard to good energetic efficiency of the overall vehicle system in everyday operation.

According to one embodiment, the rotor of the device is arranged on the front side of the vehicle front, the at least one flow guide means arranged downstream of the rotor being designed as a floor-directed discharge line, with one / the outlet-side opening of this flow guide means being integrated flush into the underbody plate of the vehicle. As already explained above, this fluidic coupling of the flow passed through the device with the flow passed under the underbody of the vehicle enables good efficiency.

According to one embodiment, the generator is connected to an energy store and / or to a control unit of the vehicle. Last but not least, this also enables the energy generated to be fed in directly without incurring energy / power losses via other intermediate storage units.

The aforementioned object is also achieved by using individual components described here in connection with a method for generating energy from the airstream W. in a ground-based vehicle, with at least one rotor mounted about a rotor axis and coupled to a generator with several rotor blades with the airstream W. is applied, with the airstream W. via a flow path SP is passed through at least one flow guide means arranged upstream of the rotor and through a vestibule surrounding the rotor and through at least one flow guide means arranged downstream of the rotor; wherein at least the rotor is arranged in the area of a vehicle front and in the area of a vehicle floor, in particular on the front side of the vehicle and with the downstream flow guide means with an outlet-side opening to the floor, the flow path SP leads from the front of the vehicle to the floor of the vehicle, the air being directed downwards by means of the flow guide means arranged downstream of the rotor, in particular with an angle of inclination backwards to the rear and to the floor in the range of 30 ° to 45 ° relative to the horizontal plane, the flow path SP the air directed onto the rotor W. and the air diverted downstream from the rotor is only curved downwards in the direction of the floor and only experiences a change in direction downwards, in particular is initially guided axially at least approximately horizontally by the rotor and is then guided under a / the underbody plate of the vehicle. This results in the aforementioned advantages, in particular with regard to the implementation of a comparatively simply constructed device with high energy efficiency, in particular also as a retrofit option.

According to one embodiment, the generator is connected to an energy store of the vehicle, the generated energy being supplied to the energy store, in particular by controlling / regulating the type of energy supply by means of a control unit of the vehicle. This can also avoid overcharging, or, for example, temporary passivation (inactivation) of the rotor can be provided, for example when driving very quickly or in very unfavorable weather conditions (e.g. freezing rain). Optionally, the rotor can also be designed to be foldable for this purpose (in particular foldable to the rear towards the stern), so that the flow path can be opened almost completely for the flow through the device with as little resistance as possible.

The aforementioned object is also achieved by a use according to the corresponding independent use claim, namely by using a flow path defined by at least one flow guide means arranged upstream of a rotor and by a vestibule surrounding the rotor and by at least one flow guide means arranged downstream of the rotor SP in an arrangement extending from a vehicle front to a vehicle floor in a ground-based vehicle for generating energy from the airstream, with the at least one rotor mounted around a rotor axis and coupled to a generator, with at least the rotor in the area of a vehicle front and in the area of a vehicle floor is arranged, in particular on the front side of the vehicle and with the downstream flow guide means with an outlet-side opening to the floor, with the flow guide means arranged downstream of the rotor a floor-directed discharge of the air takes place, in particular with an angle of inclination to the rear and to the floor in the range of 30 ° to 45 ° relative to the horizontal plane, the flow path of the air guided onto the rotor and diverted downstream from the rotor W. is only curved downwards in the direction of the floor and only experiences a change in direction downwards, in particular is initially guided axially at least approximately horizontally by the rotor and is then guided under / the underbody plate of the vehicle, in a two-, three- or four-wheeled electric vehicle, in particular the use of a device previously described above in an electric vehicle. This results in the aforementioned advantages, in particular with regard to a good energy balance and low-CO2 operation of electric vehicles.

Summary: In vehicles, the wind pressure can be used to drive at least one rotor. For example, a device for generating energy from airflow on a ground-based vehicle comprises at least one rotor with a plurality of rotor blades mounted around a rotor axis and coupled to a generator, and a flow guide means arranged upstream of the rotor and a vestibule surrounding the rotor and a flow guide means arranged downstream of the rotor . According to the invention, the rotor axis is at least approximately in the direction of travel x is aligned, wherein the device is set up and designed for an arrangement of at least the rotor in the area of a vehicle front and in the area of a vehicle floor, in particular on the front side of the vehicle and with the downstream flow guide means with an outlet-side opening to the floor. This also makes it possible to ensure good energy efficiency. In particular, the invention also relates to corresponding uses of the flow guide components described here for providing the preferred flow path.

Figure list

• 1A, 1B, 1C in zwei Seitenansichten und in einer Frontansicht jeweils in schematischer Darstellung Komponenten einer Vorrichtung gemäß einem Ausführungsbeispiel;
• 2 in einer perspektivischen Ansicht in schematischer Darstellung eine Vorrichtung gemäß einem weiteren Ausführungsbeispiel;
• 3 in einer geschnittenen Seitenansicht in schematischer Darstellung Komponenten einer Vorrichtung gemäß Ausführungsbeispielen;
• 4 in einer weiteren geschnittenen Seitenansicht in schematischer Darstellung Komponenten einer Vorrichtung gemäß Ausführungsbeispielen;

The invention is described in more detail in the following figures, reference being made to the other figures for reference symbols that are not explicitly described in a respective figure. Show it:

• 1A , 1B , 1C in two side views and in a front view, each in a schematic representation, components of a device according to an embodiment;
• 2 in a perspective view in a schematic representation a device according to a further embodiment;
• 3 in a sectional side view in a schematic representation components of a device according to embodiments;
• 4th in a further sectional side view, in a schematic representation, components of a device according to exemplary embodiments;

DETAILED DESCRIPTION OF THE FIGURES

The invention will first be explained with general reference to all reference numerals and figures. Special features or individual aspects or aspects of the present invention that are clearly visible / representable in the respective figure are discussed individually in connection with the respective figure.

An earthbound vehicle 1 exhibits a vehicle front 3 and a vehicle floor 5 with an underbody plate / cover 5.1 on. At least an energy store 7th supplies energy for the operation of the vehicle 1 , in particular also for an electric drive (not shown) of the vehicle, and by means of a control unit 9 can be the energy consumption or output of the energy store 7th controlled or regulated.

In the vehicle 1 is at least one device 10 to generate energy from airflow W. installed, with a rotor 11 with several rotor blades 11.1 in the area of a vestibule 13th between a flow guide means arranged upstream 12th (in particular funnel) and a downstream flow guide means 17th (In particular comprising a floor-directed discharge) is arranged, in particular comparatively close to the sub-floor panel 5.1 , so comparatively far down at the front of the vehicle.

The rotor axis X11 is in at least one warehouse 14th stored, the bearing 14th for example between the rotor 11 and a gear stage 15th is arranged. An output shaft of the gear stage 15th leads to a generator unit 16 , which with the control unit 9 and also directly with the energy storage 7th can be connected.

When the vehicle 1 in the direction of travel x When it picks up speed, there is wind pressure W. on the flow guide means arranged upstream 12th , which leads to a flow around the rotor 11 and leads to its rotation, the air flow on a comparatively gentle and steady and only slightly curved flow path SP through the porch 13th up to an opening on the outlet side 17a of the downstream flow guide means 17th to be led. In particular, the air is at the front of the vehicle 1 only through an island of currents 18th relative to the ground separated from a bottom current, and then after flowing around the current island 18th to be reunited with this. The current island can do this 18th Depending on the design of the vehicle, they also have a flow-optimized cross-sectional profile, for example in the form of a wing profile.

In the 1A , 1B , 1C is the inventive concept with reference to at least the essential components of the device 10 illustrated. If desired, the air flow at the front of the vehicle in the inlet area upstream of the vestibule 13th is concentrated, the flow guide means 12th with an extension with an opening / inlet angle α be arranged.

In 2 is a scalability of the device 10 in the transverse direction y indicated by the number of rotors 11 is increased.

In 3 the relative arrangement of the individual components is illustrated in more detail. Between the rotor 11 and the sub-floor 5.1 is (only) an island of currents 18th provided (in the sense of a flow separation area). The current island 18th tapers towards the stern so that the two currents at the outlet 17a be merged again. To avoid noticeable back pressure at the front of the vehicle, the flow island 18th also be drop-shaped or lens-shaped in cross section, in particular depending on further body or underbody components of the vehicle. The rotor 11 is in the height direction z comparatively close to the sub-floor 5.1 arranged, preferably in a strictly vertical orientation, that is, with a horizontally oriented rotor axis X11 .

In 4th is an exemplary course of the flow path SP shown. The dotted lines in 4th indicate the way in which fluidic optimizations can be carried out, in particular depending on the predominant operating state as expected (eg driving on the motorway). In particular, the cross section of the flow island 18th be further adapted, in particular for the purpose of adequate rounding of the air flow within the device 10 facing inner surfaces / inner circumferential surfaces. This results in an advantageously small / acute angle of inclination β between the directions of air flow in the section 17th , 17a and the air bypassing the subfloor.

In 4th it is also indicated that a / the radius of curvature of the individual flow guide means can be adapted to the respective installation situation, in particular with regard to a maximally large radius of curvature or with regard to a flow path that is as little curved as possible.

List of reference symbols

1

earthbound vehicle

3

Vehicle front

5

Vehicle floor

5.1

Underbody plate or cover

7th

Energy storage

9

Control unit

10

Device for generating energy from airflow

11

rotor

11.1

Rotor blades

12th

flow guide means arranged upstream, in particular funnels

13th

Vestibule

14th

camp

15th

Gear / gear stage

16

generator

17th

downstream flow guide means, in particular bottom-directed discharge

17a

outlet-side opening of the downstream flow guide means

18th

Flow island, switch, flow separation

SP

Air flow path through the device

W.

Wind, wind pressure, air flow

x

Direction of travel

XI1

Rotor axis

y

Transverse direction

z

Height direction (vertical axis)

α

Opening / inlet angle

β

Tilt angle

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 2333324 A2 [0003]
• DE 102009015815 A1 [0003]
• DE 102007054789 A1 [0004]
• DE 102018130609 A1 [0004]
• EP 1108890 B1 [0004]
• DE 102009056309 A1 [0004]

Claims (16)

Device (10) for generating energy from the airstream on a ground-based vehicle (1), with at least one rotor (11) with several rotor blades (11.1) mounted about a rotor axis (X11) and coupled to a generator (16) of the device (10) ), and with at least one flow guide means (12) arranged upstream of the rotor (11), and with a vestibule (13) surrounding the rotor, and with at least one flow guide means (17) arranged downstream of the rotor; characterized in that the rotor axis (X11) is aligned at least approximately in the direction of travel (x), the device being set up and designed for an arrangement of at least the rotor (11) in the area of a vehicle front (3) and in the area of a vehicle floor (5) , in particular on the front side of the vehicle and with the downstream flow guide means (17) with an outlet-side opening (17a) to the floor. Device according to Claim 1 , wherein at least one gear (15) is provided between the rotor axis (X11) and the generator (16), in particular comprising at least two interacting wheels. Device according to one of the preceding claims, wherein the at least one flow guide means (12) arranged upstream of the rotor (11) is designed as a funnel, in particular with an opening angle (α) of more than 30 °, in particular of up to 45 °, in particular with a Longitudinal extension of at least 1 to 2 times the longitudinal extension of the rotor. Device according to one of the preceding claims, wherein the cross-section predetermined by the device (10) for the air along the flow path (SP) is round, in particular circular, in particular with at least approximately cylindrical or conical sections along the flow path. Device according to one of the preceding claims, wherein the at least one flow guiding means (17) arranged downstream of the rotor (11) is designed as a bottom-directed discharge line, in particular with an outlet-side opening ( 17a), in particular with the angle of inclination in the range from 30 ° to 45 ° relative to the horizontal plane. Device according to one of the preceding claims, wherein the at least one flow guide means (17) arranged downstream of the rotor (11) adjoins an / the underbody plate (5.1) of the vehicle on the outlet side in a flush manner. Device according to one of the preceding claims, wherein the flow path (SP) of the air (W) guided onto the rotor (11) and the air diverted from the rotor (11) is only curved downwards in the direction of the floor. Device according to one of the preceding claims, wherein the flow path (SP) of the air passed through the device (10) only experiences a downward change in direction, in particular is initially guided axially at least approximately horizontally by the rotor (11) and then under a / the underbody plate ( 5.1) of the vehicle (1) is guided. Device according to one of the preceding claims, wherein the rotor (11) has four to 16 blades, in particular six to ten blades, preferably eight blades. Device according to one of the preceding claims, the axial extent of the rotor (11) being many times smaller than the axial extent of the vestibule (13), in particular by a factor of three to ten, preferably by a factor of five to eight. Device according to one of the preceding claims, wherein the device (10) is set up to generate energy exclusively by means of ambient air from the airflow (W), without system air or other technical media of the vehicle. Device according to one of the preceding claims, wherein the rotor axis (X11) is mounted in bearings (14) which are arranged externally from system-internal components of the vehicle (1), in particular accessible from the outside without exceeding a system limit to components arranged internally in the vehicle. Earthbound vehicle (1) with at least one device (10) according to one of the preceding claims, in particular two-, three- or four-wheeled electric vehicle with such a device. Ground-bound vehicle (1) according to the preceding claim, wherein the rotor (11) of the device (10) is arranged on the front side of the vehicle front (3), and wherein the at least one flow guide means (17) arranged downstream of the rotor (11) is arranged as ground-directed Derivation is designed, wherein a / the outlet-side opening (17a) of this flow guide means (17) is integrated flush in a / the underbody plate (5.1) of the vehicle (1). Earthbound vehicle (1) according to Claim 13 or 14th , wherein the generator (16) is connected to an energy store (7) and / or to a control unit (9) of the vehicle. Use of a flow path (SP) defined by at least one flow guide means (12) arranged upstream of a rotor (11) and by a vestibule (13) surrounding the rotor and by at least one flow guide means (17) arranged downstream of the rotor in one of the front of the vehicle to to a vehicle floor reaching arrangement in an earthbound vehicle for generating energy from the airstream, with the at least one rotor (11) mounted about a rotor axis (X11) and coupled to a generator (16), wherein at least the rotor (11) is in the area of a Vehicle front (3) and in the area of a vehicle floor (5) is arranged, in particular on the front side of the vehicle and with the downstream flow guide means (17) with outlet-side opening (17a) to the floor, with the aid of the flow guide means arranged downstream of the rotor (11) (17) a ground-directed discharge of the air takes place, in particular with an angle of inclination (β) backwards to the Hec k and to the floor in the range of 30 ° to 45 ° relative to the horizontal plane, the flow path (SP) of the air (W) guided onto the rotor (11) and diverted downstream from the rotor (11) merely curved downwards in the direction of the floor and only experiences a change of direction downwards, in particular is initially guided axially at least approximately horizontally by the rotor (11) and is then guided under a / the underbody plate (5.1) of the vehicle (1) in a two-, three- or four-wheeled electric vehicle , in particular use of a device according to one of the Claims 1 until 12th in the electric vehicle.

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