Annular combustion chamber for low-carbon gas turbine.

Abstract

The invention relates to an annular combustion chamber for a gas turbine, comprising: - an outer casing and an inner casing, the space between the two casings forming a toroidal volume intended to serve as a combustion zone, - an inlet mouth formed tangentially along the peripheral edge of the toroidal volume, - an outlet mouth formed tangentially along the inner edge of the toroidal volume, - an air intake path connected to the inlet mouth and intended to tangentially inject the intake air flow into the combustion zone facing the inner surface of the outer casing, - a plurality of short-circuit tunnels arranged between the intake path and an inner surface of the inner casing, each short-circuit tunnel being intended to take a portion of air from the intake path and to inject this taken air into the combustion zone. Figure for abstract: Fig. 7

Description

Title of the invention: Annular combustion chamber for low-carbon gas turbine.

[0001] The present invention relates to an annular combustion chamber for a low-carbon gas turbine. It finds a particularly interesting application in the field of designing turboshaft engines for mobility with a low environmental footprint.

[0002] Document EP0870990B1 is known describing an annular combustion chamber for a gas turbine. This chamber comprises premix burners arranged on the periphery of the combustion chamber and communicating directly with the combustion zone.

[0003] Document FR2616886 is also known, describing an annular combustion chamber for a gas turbine. Injectors are arranged radially around the entire circumference of the outer wall of the combustion chamber.

[0004] Document WO2016084111A1 discloses a multi-stage hybrid system for the induction, anchoring and stabilization of a distributed flame in advanced combustion chambers for gas turbines. Recirculation air is provided, taken from the combustion zone and reintegrated into the combustion chamber via the outer wall.

[0005] The present invention aims to use new fuels, in gaseous form.

[0006] The invention also aims to provide flexibility allowing the use of different fuels such as hydrogen, natural gas, ammonia, etc.

[0007] Another object of the invention is a combustion chamber making it possible to design a turboshaft engine with low pollutant emissions, in particular nitrogen oxide (Nox).

[0008] At least one of the aforementioned objectives is achieved with an annular combustion chamber for a gas turbine, in particular for continuous operation, comprising:

[0009] - an external box and an internal box arranged opposite each other in such a way that so that the space between the two boxes forms a toroidal volume intended to serve as a combustion zone,

[0010] - an inlet mouth made tangentially along the edge peripheral of the toroidal volume and intended to receive an intake air flow,

[0011] - an outlet mouth made tangentially along the edge interior of the toroidal volume and capable of tangentially ejecting a flow of burnt gases parallel to the flow of intake air but in the opposite direction,

[0012] - an air intake path connected to the inlet mouth and intended to inject tangentially the flow of intake air into the combustion zone facing the internal surface of the external box,

[0013] - a plurality of short-circuit tunnels disposed between the intake path and an internal surface of the internal box, each short-circuit tunnel being intended to take a portion of air from the intake path and to inject this taken air, preferably directly into the combustion zone.

[0014] By toroidal volume is meant a volume substantially inside a torus, that is to say a volume formed by a circle or any other rounded shape which is totally or partially continuous, rotating around an axis, the axis of the torus. This volume is completely closed except for predefined inlets and outlets such as for example the inlet mouth, the outlet mouth and the short-circuit tunnels.

[0015] With the combustion chamber according to the invention, a confinement and hydrodynamic stabilization of the flame is achieved, which is not thus delimited by walls.

[0016] The main flow, i.e. the dilution flow due to the air coming from the intake path, arrives and leaves in the axial direction, making a reversal of approximately 180° from the high radii to the low radii. The dilution flow slides along the internal surface of the external box, thus enclosing the combustion zone in a volume supplied with fuel.

[0017] The disturbance air is injected through the short-circuit tunnels, or "by-pass" in English, in the center of the toroidal combustion zone.

[0018] This results in a combustion zone of relatively homogeneous temperature, without a very hot front.

[0019] A homogeneous zone is provided from a mixture with burnt gases according to a recirculation rate between 1.2 and 1.5.

[0020] With the chamber according to the invention, different low-carbon gases can be used such as for example hydrogen, natural gas, biogas, etc. Great flexibility in low-carbon fuels is obtained.

[0021] According to an advantageous embodiment of the invention:

[0022] - the external box can be in the form of an open half-torus,

[0023] - the internal box can also be in the form of an open half-torus; the section of the internal box defining a semicircle of diameter less than the diameter of the semicircle defined by the section of the external box, the two external and internal boxes being arranged opposite each other so that the entire internal surface of the internal box faces only part of the internal surface of the external box,

[0024] - the inlet mouth can be defined as a diameter gap at the edge peripheral between the external box and the internal box,

[0025] - the outlet mouth can be defined as a diameter gap at the edge interior between the external box and the internal box.

[0026] An open torus is a conventional torus having a hole in the axis. The half-torus according to the invention is an open torus cut along a plane perpendicular to the axis of the torus.

[0027] With the chamber according to the invention, the gas mixture is caught in a vortex which is confined on the one hand by a dilution flow sliding along the circular surface of the external box, and on the other hand by the surface of the internal box through which the fuel arrives.

[0028] The outlet and inlet mouths are advantageously obtained if the external box is of larger dimensions than those of the internal box.

[0029] According to an advantageous characteristic of the invention, gaseous fuel ejectors can be arranged inside the short-circuit tunnels.

[0030] With the chamber according to the invention, a generally centripetal flow is obtained with a mixture flow advantageously created by the short-circuit tunnels. The gaseous injection of the fuel into the short-circuit tunnels makes it possible to bring the fuel to the heart of the combustion zone.

[0031] The fuel is thus injected in gaseous form via the ejectors located in the short-circuit tunnels so that a pre-mixed flow is generated at the inlet of the combustion zone. This pre-mixed flow is ideally homogeneous but may have spatial heterogeneities.

[0032] Preferably, the ejectors are sonic neck ejectors.

[0033] It is thus planned to use an ejector which is sonic at the neck, which allows calibration of the fuel flow. The fuel flow in such an ejector is ideally adjustable by the pressure upstream of the ejector, which allows efficient calibration. This ease of calibration and the high ejection speed promote air and fuel mixing and reduce any flame rise in the short-circuit tunnel.

[0034] It may be provided, for example during an ignition phase or for particular regimes, to activate only a part of the ejectors. Thus, during a transient phase, a part of the ejectors is activated, then the whole will be activated during a stable phase. By activating an ejector, we mean ejecting fuel via this ejector.

[0035] Spark plugs for combustion may be arranged on a wall of the outer box and / or the inner box in the combustion zone or directly in one or more of the short-circuit tunnels.

[0036] During the ignition phase, it is possible, for example, to provide for activating only ejectors contained in short-circuit tunnels having spark plugs.

[0037] According to an advantageous characteristic of the invention, each short-circuit tunnel can have, in a plane tangent to the connection point between the short-circuit tunnel and the intake path, a longitudinal axis forming a deviation angle between 45 degrees and 65 degrees, or equal to 55 degrees, relative to the axis of the toroidal volume. With such an arrangement, the fuel and air mixture participates in the overall rotation of the gas mixture in the combustion zone. The fuel and air mixture does not enter the toroidal volume frontally, but at an angle so as to accompany and feed the movement of the gas in the combustion zone.

[0038] According to another advantageous characteristic of the invention, each short-circuit tunnel may have, in a plane passing through the axis of the toroidal volume and comprising the connection point between the short-circuit tunnel and the intake path, a longitudinal axis making an angle of inclination of between 35 degrees and 55 degrees, or equal to 45 degrees, relative to the axis of the toroidal volume.

[0039] Advantageously, according to the invention, a flow at the outlet of each short-circuit tunnel can be made according to a vector having an angle greater than or equal to 70 degrees or 80 degrees relative to a radial axis at the outlet point.

[0040] The outlets of the short circuit tunnels can be arranged in the middle of the internal surface of the internal box. This allows direct access to the heart of the combustion zone.

[0041] According to an advantageous characteristic of the invention, the inlet vents may comprise blades oriented to deflect the intake air flow in a direction different from the axis of the toroidal volume.

[0042] More precisely and by way of example, each oriented blade may have, in a plane tangent to the connection point between this blade and the intake path, a longitudinal axis making a deviation angle of between 20 degrees and 40 degrees, or equal to 30 degrees, relative to the axis of the toroidal volume.

[0043] Such an arrangement makes it possible to ensure flow in a tangential direction.

[0044] The oriented blades and the short circuit tunnels are preferably oriented in the same direction. Indeed, all of the inclinations and deflections contribute to a common effect which is the swirling of the gas inside the combustion zone.

[0045] The oriented blades may be arranged on the outer surface of the peripheral edge of the inner box.

[0046] According to the invention, the intake path may have a longitudinal shape parallel to the axis of the toroidal volume.

[0047] According to another aspect of the invention, there is provided a turboshaft engine comprising:

[0048] - a compressor,

[0049] - a combustion chamber according to the invention, this combustion chamber being intended to be supplied with air from the compressor,

[0050] - a turbine intended to be powered by burnt gases coming from the combustion chamber combustion,

[0051] - a recuperator interposed between the compressor and the combustion chamber and capable to receive gas from the turbine, and

[0052] - a drive shaft intended to be propelled by the turbine to transmit a power and activate the compressor.

[0053] Such a turboshaft engine makes it possible to achieve an electrical power output of approximately 200 kW.

[0054] Other advantages and characteristics of the invention will appear on examining the detailed description of a non-limiting embodiment, and the appended drawings, in which:

[0055] [Fig-1]: [Fig.l] is a general view of a turboshaft engine according to the invention,

[0056] [Fig.2]: [Fig.2] is a simplified schematic sectional view of a chamber of combustion according to the invention coupled to a turbine,

[0057] [Fig.3]: [Fig.3] is a schematic perspective view of a bell comprising an external box of the combustion chamber according to the invention,

[0058] [Fig.4]: [Fig.4] is a schematic perspective view of a distributor equipped with short-circuit tunnels according to the invention,

[0059] [Fig.5]: [Fig.5] is a schematic perspective view at different levels of a combustion chamber according to the invention illustrating the distributor inside the bell,

[0060] [Fig.6]: [Fig.6] is a schematic sectional view of a section of the combustion chamber according to the invention,

[0061] [Fig.7]: [Fig.7] is a schematic view illustrating the inclination of the short circuit tunnels according to the invention,

[0062] [Fig.8]: [Fig.8] is a schematic view illustrating the inclination of the short circuit tunnels in another embodiment of the intake path according to the invention,

[0063] [Fig.9]: [Fig.9] is a schematic view illustrating the orientation of the short circuit tunnels of circular section according to the invention,

[0064] [Fig. 10]: [Fig. 10] is a schematic view illustrating the deflection of the short circuit tunnels according to the invention,

[0065] [Fig. 11]: [Fig. 11] is a schematic view illustrating the angle of air exiting the short circuit tunnels according to the invention,

[0066] [Fig. 12]: [Fig. 12] is a schematic view illustrating the inclination of the blades according to the invention,

[0067] [Fig. 13]: [Fig. 13] is a schematic view illustrating an ejector arranged inside a short-circuit tunnel according to the invention, and

[0068] [Fig. 14]: [Fig. 14] is a thermal image of a cross-sectional view of a section of the combustion chamber according to the invention in operation.

[0069] The embodiments which will be described below are in no way limiting; it will be possible in particular to implement variants of the invention comprising only a selection of characteristics described below isolated from the other characteristics described, if this selection of characteristics is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art. This selection comprises at least one preferably functional characteristic without structural details, or with only a part of the structural details if this part alone is sufficient to confer a technical advantage or to differentiate the invention compared to the state of the prior art.

[0070] In particular, all the variants and all the embodiments described are intended to be combined with each other in all combinations where there is nothing technically opposed to this.

[0071] In [Fig.l] we can generally see a turbo engine 1 comprising a compressor 2 capable of compressing outside air and transmitting it to a recuperator 3. The role of the latter is to increase the temperature of the compressed air by capturing the heat coming from the exhaust gases. This makes it possible to increase the overall efficiency by reducing the quantity of heat expended.

[0072] The compressed air then enters the combustion chamber 4 according to the invention. This air is burned in a mixture with fuel. The outlet of the combustion chamber allows the gases from the combustion to be channeled towards a turbine 5. The gases leaving the turbine feed the recuperator 3 before being ejected via an exhaust pipe 6. A drive shaft 7 allows the mechanical power to be transmitted and contributes to the operation of the compressor.

[0073] The combustion chamber allows the potential chemical energy of the fuel to be transformed into heat energy. The turbine transforms the heat energy into mechanical energy.

[0074] [Fig.2] is a simplified schematic sectional view of the combustion chamber 4 according to the invention coupled to the turbine 5 which drives a generator 8.

[0075] The combustion chamber 4 is bell-shaped and open inside. The hot gases leaving the combustion chamber strike the entire peripheral surface of the turbine which drives the drive shaft 7.

[0076] In [Fig.3], we can see a bell 9 made up of at least two parts. The first part is a cylinder, called an external cylinder 10 of circular section open at one end. The second part is an external box 11 in the shape of a half-torus. The second part comes as an extension of the other end of the external cylinder 10. By half-torus we mean a torus open in the axis and cut along a plane perpendicular to the axis. The hole in the axis of the torus allows access to the center of the bell. The bell 9 is intended to contain the other components of the combustion chamber.

[0077] The interior of the bell is shaped to receive a distributor 12 as seen in [Fig.4]. There is a cylinder, called the internal cylinder 13, of circular section with a diameter smaller than the diameter of the external cylinder 10. This internal cylinder 13 has an open end. The other end is connected to an internal box 14 in the shape of a half-torus. The internal cylinder 13 is connected to the periphery of the internal box 14. Over the entire external periphery of the periphery of the internal box 14 are arranged oriented vanes 15.

[0078] The distributor 12 comprises short-circuit tunnels 16 regularly distributed inside the distributor. Each short-circuit tunnel 16 has an inlet on the surface of the internal cylinder 13 and an outlet opening onto the internal surface of the internal box 14.

[0079] In [Fig.5], the distributor 12 is inserted inside the bell 9. The two elements are integral with each other and remain fixed. Such an arrangement according to the invention makes it possible to create a combustion zone 17 as seen in [Fig.6]. This combustion zone defines a toroidal volume between the two external and internal boxes.

[0080] [Fig.6] is a schematic sectional view of a section of the chamber of combustion according to the invention. We find the external cylinder 10, rectilinear up to the junction with the external box 11 rounded towards the inside of the bell. The internal cylinder 13 has a rectilinear shape up to the junction with the internal box 14 whose section is semi-circular. The center of the circle of the section of the internal box 14 is outside the distributor so that the external box 11 and the internal box 14 face each other. The internal box 14 has a diameter, substantially the distance 14a-14b, smaller than the diameter, substantially the distance 11a-11b, of the external box. The box 14 is arranged inside the bell 9. The difference in diameters between the two boxes makes it possible to have:

[0081] - an inlet mouth 18 arranged between the peripheral ends 11a and 14a of the external and internal boxes respectively, at the junction between the external cylinder 10 and the external box 11, and

[0082] - an outlet mouth 19 arranged between the inner ends of the boxes external and internal.

[0083] The outer cylinder 10 and the inner cylinder 13 form an annular corridor which is an intake path 20 intended to guide the compressed air 21 into the combustion zone 17 via the inlet mouth 18. A portion of the compressed air entering the combustion zone constitutes a generally centripetal flow towards the outlet 19 along the inner surface of the outer casing 11. Such a flow makes it possible to maintain the outer casing at a temperature lower than the temperature inside the combustion zone 17.

[0084] The outlet 19 is extended by a corridor formed by an extension 11c of the external box 11 and a folding 14c of the internal box 14 towards the inside of the bell 9. This corridor 14c-11c is designed to efficiently direct the burnt gases towards the turbine.

[0085] Advantageously, the short circuit tunnels are arranged to guide a portion of compressed air 21 from the intake path 20 to the combustion zone 17 by passing through the internal box 14. To do this, each short circuit tunnel has an inlet connected to a hole made along the internal cylinder 13, such as the hole 22 in the figure, so as to capture a portion of the compressed air 21. Each short circuit tunnel has an outlet connected to a hole made along the internal surface of the internal box 14, such as the hole 23 in [Fig. 6], so as to eject a portion of the compressed air 21 into the combustion zone 17.

[0086] According to the invention, the short circuit tunnels are arranged at an angle. That is to say that in [Fig. 6], the short circuit tunnel having its entrance at hole 22, opens into the combustion zone not at hole 23 of the same plane, but further into the internal box 14. Thus, the portion of air guided by the short circuit tunnel does not arrive frontally in the combustion zone 17 but at an angle to promote the circulation of the combustion gases in the combustion zone, that is to say in the toroidal volume.

[0087] The orientation of the short circuit tunnels 16 is described with reference to Figures 7 to 11.

[0088] An inclination is distinguished in accordance with [Fig.7]. In a plane containing the axis 4a of the toroidal volume, the tunnel 16 in [Fig.7] has a longitudinal axis 24 inclined by 45 degrees relative to the axis 4a of the toroidal volume or relative to a plane 25 tangent to the hole 22 (entrance to the short-circuit tunnel 16).

[0089] In [Fig. 8] is shown an embodiment incorporating all of the elements already mentioned but without the internal cylinder 13 of the intake path. This embodiment is compatible with all of the embodiments of the invention insofar as the intake air is not only limited to a corridor along the internal wall of the external cylinder 10. In this embodiment, the short-circuit tunnel 16a has an inlet facing the arrival of the intake air 21.

[0090] A deviation is also distinguished in accordance with [Fig.9]. In a plane tangent to the hole 22, the entrance to a short-circuit tunnel 16 in [Fig.9], the projection of the longitudinal axis 24 of the short-circuit tunnel 16 onto this tangent plane has an angle of 50 degrees relative to the axis 4a of the toroidal volume (more precisely relative to the plane containing the toroidal axis and being perpendicular to the plane tangent to the hole 22).

[0091] In [Fig. 10], unlike in [Fig. 8], we are here at an exit 22b of the short circuit tunnel 16. The longitudinal axis 24 of the short circuit tunnel 16 at the exit of this tunnel makes an angle of approximately 35 degrees relative to a plane passing through the axis 4a of the toroidal volume and by a point representing the intersection of axis 24 with the exit of the short-circuit tunnel 16.

[0092] In [Fig. 11], with a front view of the interior of the internal box 14, an outlet 26 of the short circuit tunnel 16 is seen on the internal surface of the internal box 14. The gas mixture leaving the short circuit tunnel 16 is produced according to a vector 27 making an angle greater than 80 degrees with respect to a radial axis 28 starting from the center of the toroidal volume and by the outlet 26 of the short circuit tunnel.

[0093] In [Fig. 12], the blades 15 are illustrated at the periphery of the internal cylinder 13. The air flow which arrives longitudinally is deflected tangentially at an angle of 30 degrees relative to the axis 4a of the toroidal volume.

[0094] In [Fig. 13], it is planned to install fuel ejectors 29 in the short circuit tunnels 16. These ejectors are oriented in the direction of the outlet towards the combustion zone 17.

[0095] In operation, the thermal image in [Fig. 14] makes it possible to distinguish the combustion zone 17 reaching high temperatures while the temperatures remain lower along the internal surface of the external box 11. Advantageously, the temperature is relatively homogeneous in the combustion zone, without a very hot front, and comes from a mixture with burnt gases according to a desired recirculation rate of 1.3.

[0096] Preferably, with the combustion chamber according to the invention, a slow and diffuse combustion regime is implemented instead of a strong and intense reaction front. This is the MILD regime for "Moderate and Intense Low oxygen Dilution" in English. This MILD regime is considered to be applied when, as in the present invention, the premix arrives in gas already burned inside the combustion zone and mixes there at least partially before the reaction takes place. This regime offers the following advantages:

[0097] - reduction of NOx emissions due to the reduction of the highest temperatures raised, and

[0098] - stabilization of the combustion of “lean” fuels such as ammonia or biogas which are low-carbon fuels.

[0099] Thus, the arrangement of the short circuit tunnels according to the invention allows a generally centripetal flow with a mixing flow created by the short circuit tunnels. The ideally placed ejectors allow a gaseous injection of the fuel into the short circuit tunnels. The dimensioning and orientation of the toroidal volume and the short circuit tunnels allow a global gyration.

[0100] Advantageously, in the combustion zone, the flow follows a tangential direction created by:

[0101] - a distributor rotating the flow of dilution at the combustion chamber inlet thanks to the orientation of the blades, and

[0102] - an inclination of the short circuit tunnels at the injection point in the chamber of combustion relative to the meridian plane.

[0103] The combustion chamber according to the invention makes it possible to propose an alternative for mobility with a low environmental footprint. The energy efficiency is equivalent to current diesel engines.

[0104] Of course, the invention is not limited to the examples which have just been described and numerous adjustments can be made to these examples without departing from the scope of the invention.

Claims

Claims

1. Annular combustion chamber (4) for a gas turbine, comprising: - an external box (11) and an internal box (14) arranged opposite each other such that the space between the two boxes forms a toroidal volume intended to serve as a combustion zone (17), - an inlet mouth (18) produced tangentially along the peripheral edge of the toroidal volume and intended to receive an intake air flow, - an outlet mouth (19) produced tangentially along the inner edge of the toroidal volume and capable of tangentially ejecting a flow of burnt gases parallel to the flow of intake air but in the opposite direction, - an air intake path (20) connected to the inlet mouth (18) and intended to tangentially inject the intake air flow into the combustion zone (17) facing the internal surface of the external box (11), - a plurality of short-circuit tunnels (16) arranged between the intake path (20) and an internal surface of the internal box (14), each short-circuit tunnel (16) being intended to take a portion of air from the intake path (20) and to inject this taken air into the combustion zone (17).

2. Annular combustion chamber according to claim 1, characterized in that: - the external box (11) is in the shape of an open half-torus, - the internal box (14) is in the shape of an open half-torus; the section of the internal box defines a semicircle of diameter smaller than the diameter of the semicircle defined by the section of the external box, the two external and internal boxes are arranged opposite each other so that the entire internal surface of the internal box faces only part of the internal surface of the external box, - the inlet mouth (18) is defined as being a diameter gap at the peripheral edge between the external box (11) and the internal box (14), - the outlet mouth (19) is defined as being a diameter gap at the inner edge between the outer box and the inner box.

3. Annular combustion chamber according to claim 1 or 2, characterized in that gaseous fuel ejectors (29) are arranged inside the short-circuit tunnels.

4. Annular combustion chamber according to claim 3, characterized in that the ejectors (29) are sonic neck ejectors.

5. Annular combustion chamber according to any one of the preceding claims, characterized in that each short-circuit tunnel (16) has, in a plane tangent to the connection point between the short-circuit tunnel and the intake path (20), a longitudinal axis making a deviation angle of between 45 degrees and 65 degrees, or equal to 55 degrees, relative to the axis of the toroidal volume.

6. Annular combustion chamber according to any one of the preceding claims, characterized in that each short-circuit tunnel (16) has, in a plane passing through the axis of the toroidal volume and comprising the connection point between the short-circuit tunnel and the intake path, a longitudinal axis making an angle of inclination of between 35 degrees and 55 degrees, or equal to 45 degrees, relative to the axis of the toroidal volume.

7. Annular combustion chamber according to any one of the preceding claims, characterized in that a flow at the outlet of each short circuit tunnel is made according to a vector having an angle greater than or equal to 70 degrees or 80 degrees relative to a radial axis at the outlet point.

8. Annular combustion chamber according to any one of the preceding claims, characterized in that the outlets of the short circuit tunnels (16) are arranged in the middle of the internal surface of the internal box (14).

9. Annular combustion chamber according to any one of the preceding claims, characterized in that the inlet mouths (18) comprise oriented vanes (15) to deflect the intake air flow in a direction different from the axis (4a) of the toroidal volume.

10. Annular combustion chamber according to claim 9, characterized in that each oriented blade (15) has, in a plane tangent to the connection point between this blade and the intake path, a longitudinal axis making a deviation angle of between 20 degrees and 40 degrees, or equal to 30 degrees, relative to the axis (4a) of the toroidal volume.

11. Annular combustion chamber according to claim 8 or 9, characterized in that the oriented blades (15) and the short circuit tunnels (16) are oriented in the same direction.

12. Annular combustion chamber according to claim 8 or 9, characterized in that the oriented vanes (15) are arranged on the external surface of the peripheral edge of the internal box.

13. Annular combustion chamber according to any one of the preceding claims, characterized in that the intake path has a longitudinal shape parallel to the axis of the toroidal volume.

14. Annular combustion chamber according to any one of the preceding claims, characterized in that spark plugs are arranged on a wall of the outer box and / or the inner box in the combustion zone or directly in one or more of the short-circuit tunnels.

15. A turboshaft engine comprising: - a compressor (2), - a combustion chamber (4) according to any one of the preceding claims, this combustion chamber being intended to be supplied with air coming from the compressor, - a turbine (5) intended to be supplied with burnt gas coming from the combustion chamber (4), - a recuperator (3) interposed between the compressor (2) and the combustion chamber (4) and capable of receiving gas coming from the turbine, and - a drive shaft (7) intended to be propelled by the turbine (5) to transmit power and to activate the compressor (2).

Images