Fluid energy generation system

Abstract

A fluid energy generation system is provided. The fluid energy generation system comprises a movable foil along a path. The fluid energy generation system further comprises a fluid-directing assembly to induce a fluid flow relative to the foil at a fluid- directing speed with a fluid-directing angle relative to an initial motion fluid speed experienced by the foil due to an initial foil speed of the foil so as to form an apparent fluid with an apparent fluid speed. The foil and the fluid-directing assembly are configured in such a way that when the foil moves at the initial foil speed and the fluid- directing assembly induces a fluid flow relative to the foil at the fluid-directing speed (VF) with the fluid-directing angle, the apparent fluid with the apparent fluid speed and an advancing force along the path are caused on the foil.

Description

[0001] Fluid energy generation system

[0002] The present disclosure relates to fluid energy generation systems comprising a foil assembly and a fluid-directing assembly.

[0003] BACKGROUND

[0004] A relative motion between a fluid and a foil may generate an aerodynamic force (when the fluid is gas) or a hydrodynamic force (when the fluid is liguid). The aerodynamic (or hydrodynamic) force is determined among others by the velocity of the relative motion and the angle of attack between the foil and the direction of the relative motion. The aerodynamic force generally comprises a lift and a drag component that act on the centre of pressure of the foil. The drag is a parallel and opposed force to the direction of the relative motion, while the lift is a perpendicular force to the direction of the relative motion.

[0005] Wind and tidal turbines take advantage of a moving fluid, e.g. wind or water, to transform it into electrical energy. The fluid may flow around the turbine airfoils and may generate a lift which causes the rotation of the blades.

[0006] Similarly, sails also use this principle to propel a sailboat faster than the wind speed. The sailboat may be subjected to a natural wind speed and direction. When the sailboat moves, the wind direction and the wind speed experienced by the sailboat change. The sailboat experiences an apparent wind created by the interaction of the natural wind and the motion of the sailboat. The sails may be oriented to modify the angle between the apparent wind and the sailboat. The lift generated by the sail may be harnessed by the sailboat to increase the sailboat's speed.

[0007] However, the efficiency and possibility of all these systems is highly dependent on the natural fluid availability. Fluid flow direction and intensity may be variable and unpredictable. Furthermore, low-speed fluids may not be able to generate sufficient lift. The speed of the fluid is also very dependent on the place where the airfoil is arranged or installed. These systems are thus highly dependent on the external conditions of the airfoil.

[0008] The present disclosure provides examples of systems and methods that at least partially resolve some of the aforementioned disadvantages. SUMMARY

[0009] A fluid energy generation system is provided. The fluid energy generation system comprises a foil assembly comprising a foil. The foil is movable along a path. The fluid energy generation system further comprises a fluid-directing assembly to induce a fluid flow relative to the foil at a fluid-directing speed (VF) with a fluid-directing angle (p) relative to an initial motion fluid speed (VM) experienced by the foil due to an initial foil speed of the foil (20) so as to form an apparent fluid with an apparent fluid speed (VA). The fluid-directing assembly is thus configured to induce a fluid flow around the foil. The fluid may flow towards or away from the foil.

[0010] The foil and the fluid-directing assembly are configured in such a way that when the foil moves at the initial foil speed and the fluid-directing assembly induces fluid flow relative to the foil at the fluid-directing speed with the fluid-directing angle, the apparent fluid with the apparent fluid speed (VA) and an advancing force (FA) along the path (30) are caused on the foil. The apparent fluid and the advancing force are thus generated on the foil.

[0011] The fluid-directing assembly may direct fluid towards or away from the foil moving at an initial foil speed along the path. The fluid flow has a fluid-directing speed and with a fluid-directing angle relative to the initial motion fluid speed. The fluid flow induced by the fluid-directing assembly is thus able to generate the advancing force along the path. The fluid flow outputted (or inputted) from the fluid-directing assembly thus acts on the foil and causes the generation of the advancing force along the path. The advancing force thus induces the foil to continue moving along the path.

[0012] The fluid-directing assembly further comprises one or more of fluid-directing devices, e.g. a plurality of fluid-directing devices. The fluid-directing devices comprise one or more fluid-generating devices to generate a fluid flow towards and / or away from the foil.

[0013] In this disclosure, foil is an object with a shape that when placed in a moving fluid at a suitable angle of attack the lift is substantially larger than the drag. If the fluid is a gas, the foil is commonly called an airfoil, and if the fluid is liquid, e.g. water, the foil is called a hydrofoil. In this disclosure, the motion fluid speed is the fluid speed experienced by the foil due to the movement of the foil along the path. The motion fluid speed is the relative speed of the fluid in relation to the foil in movement. The initial motion fluid speed (VM) is thus the fluid speed experienced by the foil due to the initial foil speed of the foil. The movement of the foil causes the foil to experience the motion fluid speed. The initial motion fluid speed (VM) and the initial foil speed are vectors with the same magnitude but in an opposite direction.

[0014] In this disclosure, apparent fluid speed is the fluid speed experienced by the foil when the foil is moving at the initial foil speed and the fluid-directing assembly exerts a fluiddirecting speed onto the foil. The apparent fluid speed is thus caused by the interaction of the initial motion fluid speed experienced by the foil and the fluid-directing speed applied to the foil from fluid-directing assembly.

[0015] As the fluid-directing assembly creates a fluid flow relative to the foil, the fluid energy generation system may operate independently of natural fluid conditions, allowing it to generate energy independently from external environmental and geographical constraints. The energy generation is therefore more stable.

[0016] This may also allow the fluid energy generation system to be installed in various environments and sites. Furthermore, the fluid energy generation system may help to decentralize the electrical energy generation network.

[0017] In some examples, the fluid may be gas, e.g. air. The fluid-directing assembly may thus output air towards and / or away from the foil. In other examples, the fluid may be liquid, e.g. water. The fluid energy generation system may be submerged in water and the fluid-directing assembly may direct a water flow to the foil or away from the foil.

[0018] The foil is initially moved along the path with an initial foil speed. The path may be predefined or predetermined. The foil moving at the initial foil speed causes the initial motion fluid speed. The fluid-directing assembly directs the fluid at the fluid-directing speed with the fluid-directing angle relative to the initial motion fluid speed. The relationship between the initial motion fluid speed of the foil and the fluid directed by the fluid-directing assembly forms an apparent fluid with an apparent fluid speed. The apparent fluid speed forms an angle of attack relative to the chord of the foil.

[0019] In some examples, relatively small angles of attack may increase the lift generation. For example, an angle of attack lower than 30°, e.g. lower than 15°, may be useful to optimize the lift generation for a given lift-to-drag ratio. During operation, the magnitude of the initial foil speed (and thus the magnitude of the initial motion fluid speed) may be greater than the fluid-directing speed. The speed of the foil (and thus the motion fluid speed) is thus greater than the speed of the fluid flow created by the fluid-directing assembly. This relationship forms the apparent fluid speed with a relatively small angle of attack (a).

[0020] In some examples, the foil assembly comprises a support structure. The foil may be directly or indirectly connected to the support structure. The support structure may counteract a lift force. The support structure may thus ensure that the foil moves along a predetermined path. In some examples, the support structure comprises a guide assembly for guiding the foil along the path. The support structure may comprise fixed elements relative to the foil, i.e. the foil may move relative to the fixed elements. These fixed elements may be movably attached to the foil. Additionally, or alternatively, the support structure may comprise movable elements that move together with the foil.

[0021] The energy generated by the movement of the foil may be used for a power generator, e.g. an electrical generator. The foil assembly may be connected to the power generator, e.g. to transform the kinetic energy into electrical energy. For example, the fluid energy generation system may comprise an electrical generator drivable by the movement of the foil along the path. In some examples, a gearbox may be arranged between the foil assembly and the power generator. The gearbox may be used to adapt the rotational speed of the foil assembly to the operating speed of the electrical generators. Additionally, or alternatively, the energy generated by the fluid energy generation system may be transformed into mechanical energy. The energy generated by the foil, e.g. electrical and / or mechanical energy, may also be used for operating the fluid energy generation system, e.g. foil for operating the fluid-directing assembly.

[0022] As the foil moves at an initial speed, the energy generated by the fluid energy generation system during a certain period of time may be greater than the energy necessary for operating the fluid generation system during this period of time. An excess of energy may thus be obtained during this period of time. For example, this excess of energy may be stored, directly used by the system and / or supplied to the electrical grid. For example, the power generated may be used for powering the fluiddirecting assembly. Energy may be used to move the foil at the initial foil speed. A storage energy system or the electrical grid may be used for powering the foil to start its movement.

[0023] The fluid-directing assembly is a fluid-generating assembly. The fluid-generating assembly may generate a fluid flow. The fluid flow generated by the fluid-generating assembly may be directed towards and / or away from the foil. The fluid-directing speed may be controlled by the fluid-generating assembly.

[0024] The fluid-directing assembly comprises one or more of fluid-directing devices. In some examples, the one or more fluid-directing devices may comprise a plurality of fluiddirecting devices distributed parallel to the path. These one or more fluid-directing devices may direct fluid towards or away from the foil at different locations of the path. The fluid-directing devices may be active devices that direct fluid towards the foil (or away from the foil). The fluid-directing assembly may be adjusted to direct fluid at a predetermined fluid-directing speed with a predetermined fluid-directing angle.

[0025] The fluid-directing devices comprises fluid-generating devices. The fluid-directing assembly is thus a fluid-generating assembly. The fluid-generating devices may generate a fluid flow. The fluid-directing speed may thus be adjusted by controlling the operation of the fluid-generating devices. For example, a fan may be used for the generation of a fluid flow. The fluid-generating devices may need to be externally powered. In some examples, an excess of power generated by the fluid energy generation system may be used to directly power the fluid-generating devices or to charge an energy storage system. The energy storage system may also be charged with off-peak electrical power or with power generated in other locations.

[0026] In some examples, the fluid-directing devices comprise fluid outlets with an outlet valve to regulate the fluid flow through the fluid outlets. Controlling the aperture of the outlet valve may be used for controlling the fluid-directing speed. This outlet valve may be passively or actively controlled. In some examples, high-pressure fluids may be used to be directed by the fluid-directing devices. For example, surplus air from industrial process air may be used as input for the fluid-directing devices. The fluid energy generation system may be installed adjacent to industries that output this process air. This surplus air may thus be used to drive the foil. In some of these examples, the surplus air may be stored at a desired pressure. This may allow the installation of the fluid energy generation system away from the industrial process that generates this surplus air. In some examples, the angle of the attack of the foil may be modified. In some of these examples, the foil assembly may comprise a pitch mechanism to rotate the foil about the support structure. Alternatively, or additionally, the fluid-directing devices may comprise a tilting mechanism to change the fluid-directing angle. As the fluid-directing angle changes, the angle of attack also changes. The pitch mechanism of the foil assembly and / or the tilting mechanism of the fluid-directing devices may thus be employed to optimize the angle of attack. The angle of attack may thus be adapted to a given speed of the foil and / or to a given fluid-directing speed.

[0027] In this disclosure, initial foil speed refers to the speed of the foil before interacting with the fluid-directing assembly or with a set of fluid-directing devices. After or during the interaction of the foil with the fluid-directing assembly or with the set of fluid-directing devices, the foil may be accelerated or decelerated. For example, the foil speed after the influence of a first set of fluid-directing devices may be the initial foil speed for a second set of fluid-directing devices. The initial foil speed may thus vary along the path and may depend on the influence of previous fluid-directing devices.

[0028] The fluid energy generation system may further comprise a controller. The operation of the fluid-directing devices, e.g. fluid-generating devices and / or outlet valve, may be controlled by the controller. The flow of fluid directed by fluid-directing devices may thus be controlled to enhance the movement of the foil. Alternatively, or additionally, the controller may control the operation of the tilting mechanism of the fluid-directing devices and / or the pitch system of the foil assembly.

[0029] The fluid-directing assembly may be configured to direct fluid towards and / or away from the foil. In some examples, fluid-directing devices may be mounted on the foil. These fluid-directing devices may be mounted on an external surface of the foil. The fluid-directing devices alter the fluid around the foil.

[0030] BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Non-limiting examples of the present disclosure will be described in the following, with reference to the appended drawings, in which:

[0032] Figures 1A - 1C schematically show a fluid energy generation system according to examples of the present disclosure; Figure 2 schematically shows an isometric view of a fluid energy generation system according to an example of the present disclosure;

[0033] Figure 3 schematically shows a top view of a fluid energy generation system according to an example of the present disclosure;

[0034] Figures 4A - 4D schematically illustrate a side view of a fluid-directing assembly according to different examples of the present disclosure;

[0035] Figure 5 schematically illustrates a side view of a fluid energy generation system according to an example of the present disclosure; and

[0036] Figure 6 schematically illustrates a side view of a fluid energy generation system according to an example of the present disclosure;

[0037] DETAILED DESCRIPTION OF EXAMPLES

[0038] In these Figures, the same reference signs have been used to designate matching elements.

[0039] Figures 1A - 10 schematically show a fluid energy generation system according to examples of the present disclosure. Figure 1A represents the fluid flow experienced by the foil and Figure 1 B represents the force generated by the foil in response to the fluid flow illustrated in Figure 1A.

[0040] Figures 1A 10 shows a fluid energy generation system 1 having a foil assembly 10 with a foil 20. The foil 20 comprises a chord 23 extending between the leading edge 21 and the trailing edge 22. The foil 20 of these figures moves at an initial foil speed along the path 30. The initial foil speed may be between 50 m / s and 130 m / s, e.g. between 70 m / s and 110 m / s. In these examples, the path or the direction of the initial movement is parallel to the chord 23 of the foil 20. In other examples, the chord 23 of the foil 20 may form an angle with the direction of the initial movement, i.e. with the path. The initial foil speed defines the initial motion fluid speed (VM) with the same magnitude but in an opposite direction.

[0041] The fluid energy generation system 1 of figures 1A - 1 B further comprises a fluid- directing assembly 60 that directs fluid towards the foil 20. The fluid is directed at a fluid-directing speed VF and forms at angle p with the initial motion fluid speed. The fluid-directing speed VF may be between 5m / s and 30 m / s, e.g. between 10 m / s and 20 m / s. In this example, the angle is about 90°. In other examples, the value of the angle p may be different. The fluid-directing assembly 60 may be arranged at a distance between 0,5 meters and 2 meters, optionally between 1 meter and 1 ,4 meters, e.g. 1 ,2 meters.

[0042] The initial motion fluid speed VM and the fluid-directing speed VF form an apparent fluid with apparent fluid speed VA. The apparent fluid speed VA may be obtained by: wherein,

[0043] VA is the apparent fluid speed

[0044] VF is the fluid-directing speed

[0045] VM is the initial motion fluid speed

[0046] P is the angle between VF and VM

[0047] The apparent fluid speed VA forms at an angle Y with the initial motion fluid speed VM. In this example, the chord 23 is substantially parallel to the direction of the initial motion fluid speed VM. Accordingly, in this example, the angle Y and the angle of attack a are the same. In other examples, when the chord 23 is not parallel to the movement of the foil, the angle of attack a may be obtained from the angle Y by trigonometry.

[0048] The initial motion fluid speed VM may be greater than the fluid-directing speed VF. The initial motion fluid speed VM may be greater than three times, e.g. greater than four times the fluid-directing speed VF. This relationship between velocities or speeds leads to smaller angles In this example, the angle Y between the initial motion fluid speed VM and the apparent fluid speed VA is smaller than 15°, e.g. between 3° and 10°. In this example, the angle Y may be obtained with the following expression:

[0049] Y= tan-1S wherein,

[0050] Y is the angle between VA and VM

[0051] VF is the fluid-directing speed

[0052] VM is the initial motion fluid speed The apparent fluid speed VA at the angle of attack a exercises a fluid force FF on the foil 20. This fluid force FF may be called aerodynamic force when the fluid is gas, e.g. air, or hydrodynamic force when the fluid is a liquid, e.g. water. The foil force may be decomposed into a lift force FL and a drag force FD. The drag force FD is parallel to the direction of the apparent fluid speed VA, whereas the lift force FL is perpendicular to the direction of the apparent fluid speed VA. The lift / drag ratio may depend on the foil. In this example, the lift / drag ratio of the foil may be between 8 and 12.5, e.g. around 12.

[0053] The lift force FL and the drag force FD follows the following expression:

[0054] FL = FD - [Eq 3]

[0055] Wherein:

[0056] FL is the lift force

[0057] FD is the drag force

[0058] L / D is the lift / drag ratio of the foil

[0059] The lift force FL may be obtained from the following expression:

[0060] FL = 0,5 • CL• p • A • VA2[Eq 4] wherein,

[0061] FL is the lift force

[0062] CL is the lift coefficient of the foil 20 p is the fluid density

[0063] A is the area of the foil 20

[0064] VA is the apparent fluid speed

[0065] Similarly, the drag force FD may be obtained from the following expression:

[0066] FD = 0,5 • CD• p • A • VA2[Eq 5] wherein,

[0067] FD is the drag force

[0068] CD is the drag coefficient of the foil 20

[0069] As shown in Figure 1 B, the fluid force FF may be decomposed into an advancing force FA and into a normal force FN. The advancing force FA is parallel to the direction of the initial movement of the foil 20. The normal force FN is perpendicular to the direction of the initial movement of the foil 20. The advancing force FA is thus parallel to the path 30. The advancing force FA may thus help to maintain or even accelerate the movement of the foil along the path 30. The advancing force FA (and the movement of the foil along the path) is thus a consequence of the fluid directed by the fluid-directing assembly towards the foil 20.

[0070] The advancing force FA may be obtained from the following expression:

[0071] FA = FL • sin Y — FD • cos Y [Eq 6] wherein,

[0072] FA is the advancing force

[0073] FL is the lift force

[0074] FD is the drag force

[0075] Y is the angle between VA and VM

[0076] The normal force FN may be obtained from the following expression:

[0077] FN = FL • cosy + FD • siny [Eq 7] wherein,

[0078] FN is the normal force

[0079] FL is the lift force

[0080] FD is the drag force

[0081] Y is the angle between VA and VM

[0082] The support structure (not illustrated in Figures 1A and 1 B for clarity purposes) may be used to counteract the normal force FN. The normal force may thus be compensated by the weight of the foil 20 and by the support structure.

[0083] The shape of the foil may be adapted to the fluid conditions. For example, in some examples, the chord 23 of the foil may be between 3 and 5 meters, e.g. 4 meters. The weight of the foil may be between 60000 and 100000 kg, e.g. about 80000 kg. The maximum thickness may be between 0,3 and 0,7 meters, e.g. 0,5 meters.

[0084] The fluid generation system may further comprise an electrical generator. The electrical generator may generate an electrical power PG. The electrical power PG may be obtained with the following expression

[0085] PG= FA • VM • TJG[Eq 8] wherein,

[0086] PG is the electrical power generated by the electrical generator

[0087] FA is the advancing force

[0088] VM is the initial motion fluid speed r|gis the efficiency of the electrical generator

[0089] The fluid-directing assembly 60 of Figure 1C induces a fluid flow away from the foil 20. As in figures 1 A - 1 B, the apparent fluid with the fluid speed and advancing force along the path 30 is caused on the foil.

[0090] Figure 2 schematically shows an isometric view of a fluid energy generation system 1 with a foil assembly 10 and a fluid-directing assembly 60. The foil assembly 10 comprises the foil 20 supported by the support structure 40. The foil 20 of this example spans a foil width 25 between an outer side 26 and an inner side 27.

[0091] In this example, the support structure 40 comprises a guide assembly 50 for guiding the movement of the foil 20 along the path 30. The foil 20 may thus move relative to the guide assembly 50. In this example, the guide assembly 50 comprises an inner guide 51 and an outer guide 52. The guides 51 , 52 further provide stability to the movement of the foil along the predetermined path. In this example, the guides 51 , 52 comprise an upper and a lower rail. The inner guide 51 and the outer guide 52 may respectively engage the foil 20 at the inner side 27 and at the outer side 26. In other examples, the guides may comprise a C-shape. In yet further examples, the guide assembly may comprise any suitable shape for guiding the foil along the path 30.

[0092] The guide assembly 50 may form a close-loop shape to guide the foil along a closeloop predetermined track. The guides 51 , 52 may thus extend along the close-loop predetermined track.

[0093] In this example, the support structure 40 further comprises a shaft 41 extending parallel to the foil width 25. The shaft 41 moves together with the foil 20. The shaft 41 extends between an inner end and an outer end. In this figure, the inner end protrudes from the inner side 27 of the foil 20 and the outer end protrudes from the outer side 26 of the foil 20. The outer end of the shaft may engage the outer guide 52 and the inner end of the shaft may engage the inner guide 51. In this example, the ends of the shaft 41 may slide between the upper and lower rails of the guides 51 , 52. In some examples, a wheel may be provided at the ends of the shaft to roll over the guides.

[0094] In this example, the guides 51 , 52 are arranged apart from the ground. The guides 51 , 52 may comprise a plurality of columns arranged at different locations of the guides. The columns may be anchored on the ground to support the guides 51 , 52. In other examples, the guides 51 , 52 may be arranged on the ground.

[0095] In some examples, the support structure 40 comprises at least one movable leg arranged at one of the ends of the shaft. In some of these examples, one movable leg is arranged at the inner end and another movable leg is arranged at the outer end of the shaft. The movable leg or legs may comprise a wheel to roll over the ground to move the foil along the path. In some examples, the movable leg may be moved over guides arranged on the ground. The movable legs may move together with the shaft 41 , and consequently, with the foil.

[0096] In some examples, the support structure 40 comprises a carriage configured to move along the path 30. The carriage may be moved along a closed-loop track, e.g. defined by a pair of guides. The carriage may move together with the foil.

[0097] In some examples, the support structure may be connected to an electrical generator. The movement of the foil 20 may thus be transformed into electrical energy. The support structure may be connected to a rotor of an electrical generator. In some examples, the shaft 41 may be connected to the electrical generator. For example, the inner end of the shaft 41 may be connected to the electrical generator. The path 30 may thus be around the electrical generator. The foil 20 may thus be moved about the electrical generator. A gearbox may be provided to couple the shaft 41 with the electrical generator.

[0098] In some examples, the foil assembly 10 comprises a pitch mechanism to rotate the foil 20 about the support structure 40. By rotating the foil 20 about the support structure 40, the angle of attack of the foil may be modified. This may allow for adjusting the advancing force for a given initial moving speed and fluid-directing speed. The pitch mechanism may be configured to rotate the foil 20 about the shaft 41. The foil may thus be moved with a different angle of attack depending on the circumstances. In this example, the fluid-directing assembly 60 is arranged on the ground. The foil 20 is movable relative to the fluid-directing assembly 60. The foil 20 thus moves relative to the fluid-directing assembly 60. In this example, the fluid-directing assembly 60 is arranged below the path 30. The foil 20 thus moves above the fluid-directing assembly 60. The foil 20 thus receives the fluid inputted by the fluid-directing assembly 60 from below.

[0099] In other examples, the fluid-directing assembly 60 may be arranged above the path 30. The foil 20 may thus receive the fluid flow from above.

[0100] In further examples, the fluid-directing assembly 60 may be configured to move together with the foil 20. The fluid-directing assembly 60 may be directly or indirectly attached to the foil 20. The fluid-directing assembly 60 may be arranged below or above the foil 20.

[0101] In this example, the fluid-directing assembly 60 spans a fluid-directing width 61 substantially perpendicular to the path 30. The fluid-directing width 61 is substantially parallel to the foil width 25. In this example, the fluid-directing width 61 is greater than the foil width 25. The fluid received by the foil 20 from the fluid-directing assembly 60 may thus be uniformly distributed along the foil width 25.

[0102] In some examples, the foil width 25 may extend between 20 meters and 50 meters, optionally, between 30 and 40 meters, e.g. about 32 meters. In these examples, the fluid-directing width 61 may extend between 30 and 60 meters. The fluid-directing width 61 may extend about 2 meters from the outer side 26 and the inner side 27 of the foil width 25.

[0103] Figure 3 schematically shows a top view of a fluid energy generation system according to an example of the present disclosure. The fluid energy generation system 1 of this example comprises a plurality of foils 20a-20d. The foils 20a-20d move along the path 30. The foils 20a-20d of this example are supported by a guide assembly 50 having an inner guide 51 and an outer guide 52. The foils 20a - 20d are arranged at a predetermined distance to prevent the foils from experiencing turbulences generated by other foils.

[0104] In this example, the fluid energy generation system 1 comprises a closed loop track 80 defining the path 30. The path 30 may thus be predefined. In this example, the guide assembly 50 comprises a closed-loop shape to guide the foils 20a - 20d along the closed-loop track 80. The closed loop track 80 of this figure comprises an oblong shape.

[0105] The closed loop track 80 of this example comprises a first elongated section 81 and a second elongated section 82. The foil 20a is arranged at the first elongated section and the foil 20c is arranged at the second elongated section 82. The closed loop track 80 further comprises a first rounded section 83 and a second rounded section 84 connecting the first elongated section 81 to the second elongated section 82. The foil 20b is arranged at the first rounded section 83 and the foil 20d is arranged at the second rounded section 84.

[0106] The fluid-directing assembly (not illustrated in this figure) may comprise a plurality of fluid-directing devices distributed along the closed-loop track 80.

[0107] In this example, the fluid energy generation system 1 comprises a power generator 70. The power generator 70 may be an electrical generator. The power generator 70 is arranged within the closed loop track 80. The foils 20a - 20d may thus be moved around the power generator 70. The foils 20a - 20d may be connected, e.g. through a shaft, to the power generator 70.

[0108] In this example, the fluid energy generation system 1 further comprises a housing 90 enclosing the foil assembly and the fluid-directing assembly. The foils 20a - 20d may thus be moved within the housing 90. The closed-loop track of this example is arranged within the housing. The foil or profiles may thus be moved in a controlled environment. The housing 90 may thus isolate the fluid energy generation system 1 from external conditions. T urbulences or other negative effects of the movement of the fluid may thus be reduced. The fluid outputted towards the foil(s) may thus be optimized.

[0109] The housing 90 may also thermally isolate the energy generation system 1 from external conditions. The housing may comprise thermally isolating walls to thermally isolate the elements within the housing 90.

[0110] The foil may obtain energy from the fluid. This may reduce the temperature, pressure or volume within the housing 90. The fluid energy generation system may comprise a recovery energy system due to a loss of energy caused by a variation in temperature, volume or pressure. In some examples, the power generator system may further comprise a thermal generator, e.g. a thermoelectrical generator. The thermal generator may leverage thermal differences generated by the interaction of the fluid with the foil. For example, the fluid, e.g. air, within the housing 90 may cool down. The cooling of the fluid may be used by a thermal generator to obtain thermal energy, e.g. a cooling system, or generate electrical power.

[0111] Figures 4A - 4D schematically illustrate a side view of a fluid-directing assembly according to different examples of the present disclosure. In these figures, the fluiddirecting assembly 60 comprises a plurality of fluid-directing devices 62. The fluiddirecting devices 62 direct fluid, e.g. air or water, to the foil (not illustrated in these figures) at a fluid-directing speed VF and forming at angle with the initial motion fluid speed (VM). The fluid-directing devices 62 may be distributed along the path 30 to output fluid towards the foil 20 along its path 30. For example, the fluid-directing devices 62 may be arranged along the closed-loop track 80 according to any of the examples herein. The fluid-directing devices 62 may thus be distributed parallel to the path 30.

[0112] In these examples, the fluid-directing devices 62 comprise a fluid outlet 64. Fluid is outputted from the fluid outlets 64 towards the foil 20. The fluid-directing devices 62 of these figures further comprise a fluid inlet 65. Fluid may enter the fluid-directing devices 62 through the fluid inlet 65. The fluid inlets 65 of several fluid-directing devices 62 may be fluidically connected. A fluid source, e.g. a fluid reservoir, may be fluidically connected to the fluid inlets 65 to conduct the fluid from the fluid source towards the fluid-directing devices 62.

[0113] The fluid-directing devices 62 of figure 4A are passive. A high-pressure fluid source may be fluidically connected to the fluid inlet 65. Then, the fluid may be outputted through the fluid outlet 64 at a desired fluid speed and angle.

[0114] In figures 4B - 4D, the fluid-directing devices 62 comprise an outlet valve 66 to regulate the fluid flow towards the foil. The outlet valve 66 may be arranged at the fluid outlet 64. The amount of fluid and the fluid speed may thus be regulated by the outlet valve 66.

[0115] In the examples of figures 4B - 4D, the fluid-directing assembly further comprises a controller 35. The controller 35 is configured to control the operation of the fluiddirecting devices 62. In these examples, the controller 35 is communicatively connected to the outlet valves 66. The controller 35 is configured to control outlet valve 66. The aperture of these outlet valves 66 may thus be controlled by the controller 35.

[0116] In figures 4C - 4D, the fluid-directing devices 62 further comprises a tilting mechanism 67 to change the fluid-directing angle. The fluid-directing angle p may thus be modified by the tilting mechanism. The tilting mechanism 67 may be operated by the controller 35.

[0117] The controller 35 of figures 4C - 4D may thus control the amount and the speed of the fluid outputted through the fluid outlet 64 by controlling the operation of the outlet valve 66. The controller 35 of these figures may also control the fluid-directing angle by operating the tilting mechanism 67. The fluid outputted by the fluid-directing devices 62 may thus be accurately controlled. This may allow the optimization of the advancing force (FA), and consequently, of the energy generation.

[0118] In figure 4D, the fluid-directing devices 62 further comprise fluid-generating devices 63 to generate a fluid flow towards the foil 20. The fluid-directing assembly of this example is a fluid-generating assembly. The fluid-generating devices 63 may be an air fan or a water turbine. The fluid-generating device 63 may thus cause a fluid flow at the fluiddirecting speed (VF). The control of the outlet valve 66 and the fluid-generating device 63 may allow accurately directing the fluid flow towards the foil 20. The controller 35 may activate or deactivate the fluid-generating devices 63 to adjust the fluid flow outputted by the fluid-directing assembly 60.

[0119] Figure 5 schematically illustrates a side view of a fluid energy generation system according to an example of the present disclosure. The fluid energy generation system comprises a foil assembly with a foil 20 supported by a support structure (not illustrated in Figure 5). The fluid-directing assembly 60 of this example is a fluid-generating assembly that comprises a plurality of fluid-directing devices 62a - 62h. The fluiddirecting devices 62a - 62h are arranged along the path 30.

[0120] In this example, each of the fluid-directing devices 62a - 62h comprises a fluidgenerating device 63a - 63h to generate a fluid flow and an outlet valve 66a - 66h to regulate the fluid flow towards the foil 20. The fluid-generating devices 63a - 63h comprise an air fan to impulse air towards the foil 20. In other examples, the fluiddirecting devices 62a - 62h may be according to any of the herein examples. The operation of the fluid-directing devices 62a - 62h of this example is controlled by the controller 35. The controller 35 is communicatively coupled with the fluid-directing devices 62a - 62h. The controller 35 may selectively activate or deactivate the fluidgenerating devices 63a - 63h. Furthermore, the controller 35 may control the aperture of the outlet valves 66a - 66h. The fluid flow directed towards the foil may thus be controlled by the controller 35.

[0121] In this example, the operation of the fluid-directing devices 62a - 62h may be controlled as a function of the position of the foil 20. The controller 35 of this figure is configured to obtain a distance between the foil 20 and the fluid-directing devices. The controller 35 may obtain a position of the foil 20, e.g. through a positioning sensor arranged on the foil assembly. Alternatively, or additionally, the controller 35 may obtain the initial foil speed of the foil 20. Fixed sensors may be arranged along the path 30 to detect the presence of the foil 20.

[0122] The distance between a fluid-directing device and the foil 20 may be measured between the leading edge of the foil 20 and a medium point of the fluid-directing device in the direction of the path 30.

[0123] The controller may operate the fluid-directing devices 62a - 62h to output a fluid flow when the distance between the foil 20 and the fluid-directing device 62a - 62h is lower than a threshold distance. The threshold distance may be between 15 and 35 meters, e.g. around 24 meters.

[0124] In this example, the fluid-directing devices 62g - 62h are not operating as the distance between foil 20 and the fluid-directing devices 62g - 62h is greater than the threshold distance. The fluid-generating devices 63g - 63h are switched off and / or the outlet valves 66g - 66h are closed. Fluid may thus be only outputted when the effect of this fluid flow is relevant. In this way, energy to operate the fluid-directing devices may be saved.

[0125] When the leading edge of the foil 20 approaches a specific fluid-generating device, this fluid-generating device may be activated. This may allow for generating a stable and uniform fluid flow before the foil 20 reaches the corresponding fluid-directing device. In this example, fluid-directing devices 62c - 62f are outputting a fluid flow towards the foil 20. The controller 35 may thus activate the fluid-generating devices 63c - 63f and / or open the outlet valves 66c - 66f. The controller 35 may instruct the fluid-directing devices to operate during an operating time. The operating time may be determined as a function of the initial foil speed. The controller may thus ensure that the fluid-directing devices output an adequate fluid flow while the foil 20 is above the corresponding fluid-directing devices to obtain the desired apparent fluid on the foil 20.

[0126] In this example, as the foil 20, e.g. the trailing edge, has passed over the fluid-directing devices 62a - 62b, the fluid-directing devices 62a - 62b are switched off. Energy may thus be saved.

[0127] Figure 6 schematically illustrates a side view of a fluid energy generation system according to an example of the present disclosure. In this example, the foil assembly 10 comprises an additional foil 28 connected to the foil 20. The additional foil 28 is arranged at a distance from the foil 20. In this example, the additional foil 28 is arranged below the foil 20.

[0128] The additional foil 28 is configured to be moved along an additional path 31. The additional path 31 is parallel to the path 30 of the foil 20. In this figure, the additional path 31 extends below the path 30.

[0129] The support structure 40 of this example comprises a connecting member 45 connecting the foil 20 to the additional foil 28. The arrangement of this figure allows for compensating the normal force FN. The support structure 40 may thus be lighter.

[0130] The support structure 40 of this example further comprises a guide assembly 50. The guide assembly 50 guides the foil 20 and the additional foil 28. The connecting member 45 engages the guide assembly 50 to guide the foils 20,28 along their corresponding paths 30, 31.

[0131] The fluid-directing assembly 60 of this example is arranged between the foils 20, 28. The fluid-directing assembly 60 of this example directs fluid towards the foil 20 and towards the additional foil 28. The fluid-directing assembly may thus be configured to direct fluid flows in opposite directions. The additional foil may receive the fluid directed by the fluid-directing assembly according to any of the examples herein.

[0132] Example The inventor has found that a fluid energy generation system according to the following features allows for obtaining net energy when the foil 20 is moving at a given fluiddirecting speed (VF):

[0133] - Foil 20:

[0134] • Chord 23: 4 meters

[0135] • Thickness: 0,5 meters

[0136] • Foil width 25: 32 meters

[0137] • Weight: 80149 kg

[0138] • CL: 1 ,2

[0139] • L / D: 12

[0140] • Area of the foil A: 128 m2

[0141] • Initial motion fluid speed VM: 90 m / s

[0142] Fluid conditions:

[0143] • Type of fluid: air

[0144] • Fluid pressure: 1 atm

[0145] • Fluid temperature: 15 °C

[0146] • Fluid density p 1 ,23 kg / m3

[0147] Fluid-directing assembly 60:

[0148] • Fluid-directing width 61 : 36 meters

[0149] • Operating fluid-directing length (length of operating fluid-directing devices): 24 meters

[0150] • Distance to the foil: 1 ,2 meters

[0151] • Fluid-directing speed VF: 14,89 m / s

[0152] • Fluid-directing angle p: 90°

[0153] • Area of the fluid-directing assembly AF: 36 x 24 = 864 m2

[0154] • Efficiency of the fluid-generating devices QFD: 50 %

[0155] Electrical generator:

[0156] • Efficiency of the electrical generator r|g: 90 %

[0157] In this example, considering the initial motion fluid speed VM of 90 m / s (as the initial foil speed is 90 m / s), the fluid-directing speed VF of 14,89 m / s and the fluid-directing angle of 90°, and applying the Eq. 1 , the apparent fluid speed VA is about 91 ,22 m / s. The angle y between the initial motion fluid speed VM and apparent foil speed VA obtained with Eq. 2 is about 9,39°. The lift force FL of this example obtained with Eq. 4 is about 786261 N. The drag force FD of this example obtained with Eq. 3 is about 65504 N.

[0158] Using Eq 6 an advancing force FA of 63718 N is obtained and a normal force FN of 786198 N is obtained using Eq 7.

[0159] In this example, the chord 23 of the foil may advance parallel to the direction of the movement of the foil. Accordingly, the angle Y and the angle of attack a are the same. As a result, the angle of attack a of this example is about 9,39°.

[0160] The movement of the foil 20 of this example generates an electrical power of 5161 kW obtained with Eq 8.

[0161] In this example, the fluid-directing assembly 60 comprises fluid-generating devices 63. The power for operating the fluid-generating devices 63 may be obtained with the following expression: wherein,

[0162] PFD is the power for operating the fluid-directing devices

[0163] VF is the fluid-directing speed

[0164] AF is the area of the fluid-directing assembly p is the density of the fluid

[0165] QFD is the efficiency of the fluid-generating devices

[0166] Applying Eq 9 to this example a power for operating the fluid-directing devices of 3511 kW is obtained. Therefore, in this example, the fluid-directing assembly requires 3511 kW to direct air at a fluid-directing speed VF of 14,89 m / s and the movement of the foil 20 can generate 5161 kW when the foil is initially moving at an initial foil speed that provides an initial motion fluid speed VM of 90 m / s. Consequently, the fluid energy generation system can generate an excess of 1650 kW under certain conditions. The fluid-directing assembly may thus generate energy during a period of time.

[0167] For reasons of completeness, various aspects of the present disclosure are set out in the following numbered clauses:

[0168] Clause 1 : A fluid energy generation system (1) comprising: a foil assembly (10) comprising a foil (20) movable along a path (30); a fluid-directing assembly (60) to induce a fluid flow relative to the foil (20) at a fluid-directing speed (VF) with a fluid-directing angle (P) relative to an initial motion fluid speed (VM) experienced by the foil due to an initial foil speed of the foil (20) so as to form an apparent fluid with an apparent fluid speed (VA); wherein the foil (20) and the fluid-directing assembly (60) are configured in such a way that when the foil (20) moves at the initial foil speed and the fluid-directing assembly (60) induces a fluid flow to the foil (20) at a fluid-directing speed (VF) with the fluid-directing angle (P), the apparent fluid with the apparent fluid speed ( A) and an advancing force (FA) along the path (30) are caused on the foil (20).

[0169] Clause 2: A fluid energy generation system (1) according to clause 1 , wherein the initial motion fluid speed (VM) is greater than the fluid-directing speed (VF).

[0170] Clause 3: A fluid energy generation system (1) according to any of clauses 1 - 2, wherein the apparent fluid speed (VA) and the initial motion fluid speed (VM) form an angle (Y) lower than 30°, optionally lower than15°.

[0171] Clause 4: A fluid energy generation system (1) according to clause 3, wherein an angle of attack (a) between the apparent fluid speed (VA) and a chord (23) of the foil (20) is lower than 30°, optionally lower than 15°.

[0172] Clause 5: A fluid energy generation system (1) according to any of clauses 1 -4, further comprising a closed-loop track (80) defining the path (30).

[0173] Clause 6: A fluid energy generation system (1) according to clause 5, wherein the closed-loop track (80) comprises a first elongated section (81) and a second elongated section (82).

[0174] Clause 7: A fluid energy generation system (1) according to clause 6, wherein the closed-loop track (80) comprises a first rounded section (83) and a second rounded section (84) connecting the first elongated section (81) to the second elongated section (82).

[0175] Clause 8: A fluid energy generation system (1) according to any of clauses 1 - 7, wherein the support structure (40) comprises a guide assembly (50) for guiding the movement of the foil (20) along the path (30).

[0176] Clause 9: A fluid energy generation system (1) according to clause 8, wherein the guide assembly (50) comprises a closed-loop shape to guide the foil (20) along the closed- loop track (80) according to any of clauses 4 - 6.

[0177] Clause 10: A fluid energy generation system (1) according to any of clauses 1 - 9, wherein the foil (20) spans a foil width (25); and wherein the support structure (40) comprises a shaft (41) extending parallel to the foil width (25).

[0178] Clause 11 : A fluid energy generation system (1) according to any of clause 10, wherein the support structure (40) comprises a movable leg arranged at one end of the shaft (41).

[0179] Clause 12: A fluid energy generation system (1) according to any of clauses 10 - 11 , wherein the shaft (41) is connected to an electrical generator.

[0180] Clause 13: A fluid energy generation system (1) according to any of clauses 1 - 12, wherein the support structure (40) comprises a carriage configured to be moved along the path (30).

[0181] Clause 14: A fluid energy generation system (1) according to clause 13, wherein the carriage is configured to move along the closed-loop track (80) according to any of clauses 4 - 6.

[0182] Clause 15: A fluid energy generation system (1) according to any of clauses 1 - 14, wherein the foil assembly (10) further comprises a pitch mechanism to rotate the foil about the support structure (40).

[0183] Clause 16: A fluid energy generation system (1) according to clause 15, wherein the pitch mechanism is to rotate the foil (20) about the shaft (41) according to any of clauses 10 - 12.

[0184] Clause 17: A fluid energy generation system (1) according to any of clauses 1 - 16, further comprising an electrical generator drivable by the movement of the foil (20) along the path (30).

[0185] Clause 18: A fluid energy generation system (1) according to clause 17, wherein the support structure (40) is connected to the electrical generator, optionally to a rotor of an electrical generator. Clause 19: A fluid energy generation system (1) according to clause 18, wherein the path (30) is around the electrical generator so that the foil (20) is configured to move about the electrical generator.

[0186] Clause 20: A fluid energy generation system (1) according to any of clauses 1 - 19, wherein the fluid-directing assembly (60) comprises one or more fluid-directing devices (62).

[0187] Clause 21 : A fluid energy generation system (1) according to clause 20, wherein the fluid-directing devices (62) are distributed parallel to the path (30).

[0188] Clause 22: A fluid energy generation system (1) according to any of clauses 20 - 21 , wherein the fluid-directing devices (62) comprise fluid-generating devices (63) to generate a fluid flow towards and / or away from the foil (20).

[0189] Clause 23: A fluid energy generation system (1) according to clause 22, wherein fluidgenerating devices (63) comprise an air fan or a water turbine.

[0190] Clause 24: A fluid energy generation system (1) according to any of clauses 20 - 23, wherein the fluid-directing devices (62) comprise fluid outlets (64) with an outlet valve (66) to regulate the fluid flow flowing through the fluid outlets (64).

[0191] Clause 25: A fluid energy generation system (1) according to any of clauses 20 - 24, wherein the fluid-directing devices (62) comprise a tilting mechanism (67) to change the fluid-directing angle (P).

[0192] Clause 26: A fluid energy generation system (1) according to any of clauses 20 - 25, further comprising a controller (35) configured to control the operation of the fluiddirecting devices (62).

[0193] Clause 27: A fluid energy generation system (1) according to clause 26, wherein the controller (35) is configured to activate / deactivate the fluid-generating devices (63) according to any of clauses 22 - 23.

[0194] Clause 28: A fluid energy generation system (1) according to any of clauses 26 - 27, wherein the controller (35) is configured to control the outlet valve (66) according to clause 24.

[0195] Clause 29: A fluid energy generation system (1) according to any of clauses 26 - 28, wherein the controller (35) is configured to: obtain a distance between the foil (20) and one or more of the fluid-generating devices (63); and activate the one or more fluid-generating devices (63) according to any of clauses 23 - 24 when the distance between the foil (20) and the one or more fluidgenerating devices is lower than a threshold distance.

[0196] Clause 30: A fluid energy generation system (1) according to any of clauses 26 - 29, wherein the controller (35) is configured to: obtain a distance between the foil (20) and one or more of the fluid-directing devices (62); and open the outlet valve (66) according to clause 24 of the one or more fluiddirecting devices when the distance between the foil (20) and the one or more fluidgenerating devices is lower than a threshold distance.

[0197] Clause 31 : A fluid energy generation system (1) according to any of clauses 1 - 30, wherein the fluid-directing assembly (60) is configured to move together with the foil (20).

[0198] Clause 32: A fluid energy generation system (1) according to clause 31 , wherein the fluid-directing assembly (60) is arranged below the foil (20).

[0199] Clause 33: A fluid energy generation system (1) according to clause 31 , wherein the fluid-directing assembly (60) is arranged above the foil (20).

[0200] Clause 34: A fluid energy generation system (1) according to any of clauses 1 - 30, wherein the foil (20) is movable relative to the fluid-directing assembly (60).

[0201] Clause 35: A fluid energy generation system (1) according to clause 34, wherein the fluid-directing assembly (60) is arranged below the path (30).

[0202] Clause 36: A fluid energy generation system (1) according to clause 35, wherein the fluid-directing assembly (60) is arranged above the path (30).

[0203] Clause 37: A fluid energy generation system (1) according to any of clauses 1 - 36, wherein the foil assembly (10) further comprises an additional foil (28) arranged at a distance from the foil (20); wherein the additional foil (28) is connected to foil (20) and is movable along an additional path (31); wherein the additional path (31) is parallel to the path (30). Clause 38: A fluid energy generation system (1) according to clause 37, wherein the support structure (40) comprises a connecting member (45) connecting the foil (20) to the additional foil (28).

[0204] Clause 39: A fluid energy generation system (1) according to any of clauses 37 - 38, wherein the fluid-directing assembly (60) is arranged between the foil (20) and the additional foil (28).

[0205] Clause 40: A fluid energy generation system (1) according to clause 39, wherein the fluid-directing assembly (60) is configured to direct fluid towards the additional foil (28).

[0206] Clause 41 : A fluid energy generation system (1) according to any of clauses 1 - 40, further comprising a housing (90) enclosing the foil assembly (10) and the fluiddirecting assembly (60).

[0207] Clause 42: A fluid energy generation system (1) according to clause 41 , wherein the housing (90) comprises thermally isolating walls.

[0208] Clause 43: A fluid energy generation system according to any of clauses 41 - 42, further comprising a recovery energy system due to a loss of energy caused by a variation in temperature, volume or pressure.

[0209] Clause 44: A fluid energy generation system (1) according to any of clauses 1 - 43, further comprising a power generator (70) connected to the foil assembly (10), optionally an electrical generator.

[0210] Clause 45: A fluid energy generation system (1) according to any of clauses 1 - 44, further comprising a thermoelectrical generator.

[0211] Clause 46: A fluid energy generation system (1) according to any of clauses 1 - 45, wherein the fluid-directing assembly is configured to direct fluid towards and / or away from the foil.

[0212] Although only a number of examples have been disclosed herein, other alternatives, modifications, uses and / or equivalents thereof are possible. Furthermore, all possible combinations of the described examples are also covered. Thus, the scope of the present disclosure should not be limited by particular examples, but should be determined only by a fair reading of the claims that follow.

Claims

CLAIMS1 . A fluid energy generation system (1) comprising: a foil assembly (10) comprising a foil (20) movable along a path (30); a fluid-directing assembly (60) to induce a fluid flow relative to the foil (20) at a fluid-directing speed (VF) with a fluid-directing angle (P) relative to an initial motion fluid speed (VM) experienced by the foil (20) due to an initial foil speed of the foil (20) so as to form an apparent fluid with an apparent fluid speed (VA); wherein the foil (20) and the fluid-directing assembly (60) are configured in such a way that when the foil (20) moves at the initial foil speed and the fluid-directing assembly (60) induces a fluid flow relative to the foil (20) at the fluid-directing speed (VF) with the fluid-directing angle (P), the apparent fluid with the fluid speed ( A) and an advancing force (FA) along the path (30) are caused on the foil (20); wherein the fluid-directing assembly (60) comprises one or more of fluiddirecting devices (62), and wherein the fluid-directing devices (62) comprise one or more fluid-generating devices (63) to generate a fluid flow towards and / or away from the foil (20).2.A fluid energy generation system (1) according to claim 1 , wherein the apparent fluid speed (VA) and the initial motion fluid speed (VM) form an angle (Y) lower than 30°, optionally lower than 15°.3.A fluid energy generation system (1) according to any of claims 1 - 2, further comprising a closed-loop track (80) defining the path (30).4.A fluid energy generation system (1) according to any of claims 1 - 3, wherein the foil assembly (10) further comprises a support structure (40) connected to the foil (20).

5. A fluid energy generation system (1) according to claim 4, wherein the support structure (40) comprises a guide assembly (50) for guiding a movement of the foil (20) along the path (30).6.A fluid energy generation system (1) according to any of claims 4 - 5, wherein the support structure (40) comprises a carriage configured to be moved along the path (30).7.A fluid energy generation system (1) according to any of claims 1 - 6, wherein the fluid-generating devices (63) comprise an air fan or a water turbine.

8. A fluid energy generation system (1) according to any of claims 1 - 7, wherein the fluid-directing devices (62) comprise a tilting mechanism (67) to change the fluiddirecting angle (P).

9. A fluid energy generation system (1) according to any of claims 1 - 8, wherein the fluid-directing devices (62) comprise fluid outlets (64) with an outlet valve (66) to regulate the fluid flow flowing through the fluid outlets (64).10.A fluid energy generation system (1) according to any of claims 1 - 9, wherein the fluid-directing assembly (60) is configured to move together with the foil (20).

11. A fluid energy generation system (1) according to any of claims 1 - 10, further comprising a controller (35) configured to control the operation of the fluid-directing assembly (60).12.A fluid energy generation system (1) according to any of claims 1 - 11 , further comprising a housing (90) enclosing the foil assembly (10) and the fluid-directing assembly (60).13.A fluid energy generation system (1) according to claim 12, further comprising a recovery energy system due to a loss of energy caused by a variation in temperature, volume or pressure.

14. A fluid energy generation system (1) according to any of claims 1 - 13, further comprising a power generator (70) connected to the foil assembly (10), optionally an electrical generator.

15. A fluid energy generation system (1) according to any of claims 1 - 14, wherein the foil assembly (10) further comprises an additional foil (28) arranged at a distance from the foil (20); wherein the additional foil (28) is connected to the foil (20) and is movable along an additional path (31); wherein the additional path (31) is parallel to the path (30).

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