Multistage duct turbofan power generation equipment

Abstract

The invention discloses multistage duct turbofan power generation equipment, and relates to the technical field of power generation equipment. The ducted shell comprises a first ducted shell body and a second ducted shell body which are coaxially arranged in a communicating mode. The flow guide assembly is arranged in the first duct shell and used for guiding external airflow into the second duct shell; the positioning assembly is arranged in the duct assembly; and the middle shaft is arranged in the duct assembly through a positioning assembly. Aiming at the pain points of structural fatigue, shaking and space waste caused by one-way torque conduction when a conventional wind driven generator is mounted on a mobile platform, a conformal integrated duct design is adopted, and a two-stage turbofan, a planetary reverse rotation mechanism and a permanent magnet generator are coaxially integrated, so that air flow shrinks in a trumpet-shaped duct to accelerate pre-swirl flow guide, and the flow guide efficiency is improved. The contra-rotating turbofan is further driven to do work synchronously, the torque is completely self-counteracted, high tip speed ratio operation can be achieved at the low wind speed, and efficient and zero-reaction-torque power generation in the narrow space of the mobile platform is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power generation equipment, and particularly relates to a multi-stage ducted turbofan power generation equipment. BACKGROUND

[0002] The power generation equipment refers to a complete set of technical equipment for converting primary energy such as coal, oil, natural gas, water energy, wind energy, solar energy, nuclear energy, biomass and geothermal energy into electric energy through mechanical, electromagnetic, chemical or photovoltaic effects. It covers boilers, steam turbines, gas turbines, water turbines, wind turbines, photovoltaic modules, reactors, generators, transformers, inverters, excitation systems, cooling systems, control and protection systems and their supporting facilities. According to the type of energy, the power generation equipment can be divided into thermal, hydraulic, wind, solar, nuclear and renewable energy power generation equipment. According to the function, the power generation equipment can be divided into prime movers (such as steam turbines, water turbines and wind turbines), generator bodies (synchronous or asynchronous), electric energy conversion and grid-connected equipment (main transformer, high-voltage switch and converter valve) and auxiliary support systems (water supply, coal conveying, dust removal, desulfurization and denitrification, cooling circulation, containment, radiation shielding). Modern large-scale units have a single machine capacity of more than 1000 MW, combined cycle efficiency exceeds 60%, wind turbine blade diameter is more than 260 m, and photovoltaic module laboratory efficiency is more than 26%. Through digitalization, intelligentization and modularization design, remote monitoring, condition-based maintenance and rapid start-stop are realized, which is the core physical basis and key high-end equipment to support power grid operation, ensure energy security and promote low-carbon transformation.

[0003] The existing turbofan power generation equipment generally adopts a single-stage rotor structure, that is, a single set of turbofan blades directly drives the generator to rotate. Although this scheme has simple structure and fewer parts, it has exposed a serious defect in actual operation: the turbofan blades rotate in the same direction, which will generate a large one-way torque in the axial direction of the whole machine. The torque is transmitted to the carrier (tower, floating platform, wing or vehicle chassis) through the rotor shaft and bearing seat, so that the carrier bears periodic unbalanced load. Long-term operation may cause structural fatigue, looseness and even resonance, which reduces the system reliability and service life. The one-way torque needs to be balanced by additional anti-torque devices (such as tail rudder, counter-pulling cable, counterweight or reverse propeller), which increases the weight, wind area and manufacturing and maintenance cost of the whole machine, and to some extent, weakens the energy capture efficiency. The single-stage rotor is extremely sensitive to wind speed and load changes. When the wind speed changes suddenly, the rotor acceleration is large, and the instantaneous peak torque directly acts on the carrier, which easily causes shaking or displacement, affects the stability of power generation, and also causes impact on the grid-connected power quality. The transmission shaft with increased diameter and the bearing with increased specifications further increase the friction loss and reduce the effective output power. Therefore, how to fundamentally eliminate or greatly weaken the one-way torque caused by the rotation of the turbofan without adding additional anti-torque devices, and improve the stability and service life of the carrier, has become a key problem to be solved in the current ducted turbofan power generation technology field. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage ducted turbofan power generation device to solve the problem mentioned in the background art that in existing power generation devices, the turbofan blades rotate in the same direction, which will generate a large unidirectional torque in the direction of the whole machine axis. This torque is transmitted to the carrier (tower, floating platform, air wing or vehicle chassis, etc.) through the rotor shaft and bearing housing, causing the carrier to be subjected to periodic off-center loads. Long-term operation is prone to structural fatigue, loosening or even resonance problems, which reduces the reliability and life of the system.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A multi-stage ducted turbofan power generation device, including

[0007] A duct assembly; comprising a first duct shell and a second duct shell coaxially connected;

[0008] A flow guiding component, which is disposed inside the first duct shell, is used to guide external airflow into the second duct shell;

[0009] A positioning component, wherein the positioning component is disposed inside the duct component;

[0010] A central axis, which is positioned inside the duct assembly via a positioning component;

[0011] A stator assembly, the stator assembly being disposed on a central shaft;

[0012] Rotor rings, a plurality of said rotor rings being rotatably disposed outside the stator assembly;

[0013] In this configuration, a number of rotor rings located inside the second duct housing are fixedly mounted with second turbine blades on their outer walls. Two adjacent second turbine blades are fixedly connected to opposite ends with first gears. A second gear meshes between the two first gears. A support shaft is fixedly connected to the inner wall of the second duct housing, and the second gear is rotatably mounted on the outer wall of the support shaft.

[0014] Preferably, the first duct shell has a trumpet-shaped structure.

[0015] Preferably, a plurality of neodymium magnets are fixedly installed in a circumferential array on the inner wall of the rotor ring.

[0016] Preferably, the stator assembly includes a stator core and a coil, with a plurality of stator cores arranged in a circumferential array on the outer wall of the central shaft, and the coil sleeved on the outer wall of the stator core.

[0017] Preferably, the positioning component includes a plurality of positioning rods fixedly disposed on the inner walls of the first duct shell and the second duct shell, one end of each positioning rod being fixedly disposed with an mounting ring, and the central shaft being fixedly disposed on the inner wall of the plurality of mounting rings.

[0018] Preferably, the flow guide assembly comprises a plurality of first vane rings fixedly arranged on the outer wall of the first rotor ring inside the first duct shell.

[0019] A power generation method of a multi-stage ducted turbofan power generation device, comprising the following steps:

[0020] S1. The low-speed airflow from the outside enters the horn-shaped first duct shell and is accelerated and rectified in the converging-diverging flow passage;

[0021] S2. The airflow first acts on the first vane ring to drive the first vane ring to rotate, realizing pre-rotation pressurization;

[0022] S3. The pre-rotated airflow enters the second duct shell and pushes at least two levels of second vane rings, and the adjacent two levels of rotor rings are made to rotate at the same speed in opposite directions through the planetary reverse rotation mechanism, so as to eliminate the torque effect;

[0023] S4. The neodymium magnets on the inner wall of each rotor ring and the stator core and coil fixed on the central shaft move relative to each other, cut the magnetic induction lines to generate induced electromotive force, and realize multi-stage power generation;

[0024] S5. The alternating current output by the coil is converted into stable direct current or power frequency alternating current through the external rectifier-inverter unit, and the electric energy collection and grid connection are completed.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The present application aims at the pain points of structural fatigue, shaking and space waste caused by one-way torque transmission when the conventional wind turbine is installed on a mobile platform, adopts conformal integrated duct design, integrates two-stage turbofan, planetary reverse rotation mechanism and permanent magnet generator coaxially, makes the airflow shrink and accelerate in the horn-shaped duct, pre-rotates and guides the airflow, drives the counter-rotating turbofan to work synchronously and completely self-cancels the torque, so that the carrier is only subjected to axial thrust without torsional vibration; At the same time, the outer rotor permanent magnet array and the fixed coil are cut at high speed, so that high tip speed ratio operation can be realized at low wind speed, the starting performance and wind energy-electric energy conversion efficiency are significantly improved, and efficient and zero counter-torque power generation in a small space of a mobile platform is realized.

[0027] The external airflow of the application is first contracted and accelerated by the horn-shaped first duct shell to form a high-speed and low-turbulence axial flow field; after entering the second duct shell, the airflow acts on the two adjacent second vane stages, since the two second vane stages are respectively fixed on the outer walls of the corresponding rotor rings, and the end first gears are engaged through the second gears to form a planetary reverse mechanism, when the first second vane stage is rotated by the wind, the power is transmitted through the first gear-second gear-another first gear to make the second second vane stage obtain instantaneous equal-speed reverse torque; the neodymium magnets on the inner walls of the two rotor rings cut the magnetic induction lines of the stator core and coil in the opposite direction, and the two reverse torques are offset in the gear-axle closed loop, so that the carrier only bears the net axial thrust without net torque, realizing low wind speed easy start, full section high efficiency and zero torsional vibration stable power generation.

[0028] The application forms planetary engagement through the shared second gear and the shaft fixed on the inner wall of the duct, when the first second vane stage is rotated by the wind, the power is transmitted through the first gear-second gear-another first gear to make the second second vane stage obtain instantaneous equal-speed reverse torque, so that a pair of equal and opposite aerodynamic torques are formed on the same axis, the torques are offset in the gear-axle closed loop, and the carrier (tower, vehicle body, ship body or building facade) only bears the net axial thrust without net torque, completely eliminating the structural fatigue, shaking and resonance of the traditional single-stage fan caused by one-way torque; at the same time, the neodymium magnets on the inner walls of the two rotor rings rotate in the opposite direction with the respective rotor rings, and form an outer rotor radial flux structure with the stator core and coil fixed on the central shaft, realizing magnetic induction line cutting; the positioning rod and the mounting ring rigidly connect the central shaft and the duct shell, ensure the air gap accuracy, and directly close the remaining unbalanced torque in the duct, further reducing the vibration; the blade tips of the first and second vane stages and the duct are provided with air blowing slots to suppress blade tip vortex leakage and improve wind energy capture; through the above-mentioned multi-stage series connection, reverse balance and radial flux cooperation, the power density of the whole machine is increased by more than 40% compared with the same diameter single-stage duct fan, realizing zero torsional vibration, low noise and high specific power stable power generation, meeting the needs of new energy vehicle range extender, small ship, low-speed aircraft and high-rise building narrow space compensation power generation and other multi-scene requirements. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is an external overall structure schematic diagram of a multi-stage duct vane fan power generation equipment;

[0030] Figure 2 It is a cross-sectional structure schematic diagram of a multi-stage duct vane fan power generation equipment;

[0031] Figure 3 It is a partial structure schematic diagram of a multi-stage duct vane fan power generation equipment;

[0032] Figure 4 It is a local disassembly structure schematic diagram of a multi-stage duct vane fan power generation equipment;

[0033] Figure 5 A multi-stage ducted turbofan power generation device Figure 3 A partial enlarged view of the middle A;

[0034] Figure 6 A multi-stage ducted turbofan power generation device Figure 4 A partial enlarged view of the middle B.

[0035] In the figure: 1, the first duct shell; 2, the second duct shell; 3, the middle shaft; 4, the stator core; 5, the coil; 6, the rotor ring; 7, the second turbofan blade; 8, the positioning rod; 9, the mounting ring; 10, the first turbofan blade; 11, the first gear; 12, the second gear; 13, the support shaft; 14, the neodymium magnet. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0037] Embodiment one:

[0038] Please refer to Figures 1-6 The present application is a multi-stage ducted turbofan power generation device, which comprises

[0039] a duct assembly, which comprises a first duct shell 1 and a second duct shell 2 arranged coaxially and in communication;

[0040] a flow guide assembly, which is arranged inside the first duct shell 1 and is used for guiding external airflow into the second duct shell 2;

[0041] a positioning assembly, which is arranged inside the duct assembly;

[0042] a middle shaft 3, which is arranged inside the duct assembly through the positioning assembly;

[0043] a stator assembly, which is arranged on the middle shaft 3;

[0044] a rotor ring 6, a plurality of which are arranged rotatably outside the stator assembly;

[0045] The outer wall of each rotor ring 6 arranged inside the second duct shell 2 is fixedly provided with a second vortex fan blade 7, and the opposite end of each two adjacent second vortex fan blades 7 is fixedly connected with a first gear 11, and the two first gears 11 are meshed with a second gear 12, and the inner wall of the second duct shell 2 is fixedly connected with a support shaft 13, and the second gear 12 is rotatably arranged on the outer wall of the support shaft 13.

[0046] As can be seen from the above, the external airflow is first contracted and accelerated by the horn-shaped first duct shell 1 to form an axial flow field with high speed and low turbulence; after entering the second duct shell 2, the airflow acts on the two adjacent second vortex fan blades 7, and since the two second vortex fan blades 7 are respectively fixedly connected to the outer wall of the corresponding rotor ring 6, and the end first gears 11 are meshed through the second gear 12 to form a planetary reverse rotation mechanism, when the first second vortex fan blade 7 rotates under the wind, the power is transmitted through the first gear 11→ the second gear 12→ the other first gear 11, so that the second second vortex fan blade 7 instantaneously obtains an equal-speed reverse torque; the neodymium magnet 14 on the inner wall of the two rotor rings 6 is cut in opposite directions with the stator core 4 and the coil 5, and the two reverse torques are offset in the closed loop of the gear part-support shaft 13, so that the carrier only bears the net axial thrust without the net torque, thereby realizing stable power generation with low wind speed, easy starting, high efficiency, and zero torsional vibration.

[0047] As can be seen from the above, Figures 1-2 In order to reduce the turbulence loss, the first duct shell 1 is in a horn-shaped structure.

[0048] As can be seen from the above, the horn-shaped first duct shell 1 forms a contraction-expansion type flow channel, and the external low-speed airflow is accelerated to the optimal tip speed ratio interval when entering the first duct shell 1, and the turbulence degree is reduced by more than 15%, thereby providing stable and high-energy axial kinetic energy for the subsequent two rotor rings 6, so as to solve the problem of difficult starting under low wind speed conditions.

[0049] As can be seen from the above, Figures 3-6 In order to generate power, the inner wall of the rotor ring 6 is fixedly provided with a plurality of neodymium magnets 14 in a circumferential array.

[0050] The stator assembly includes a stator core 4 and a coil 5, and a plurality of stator cores 4 are arranged in a circumferential array on the outer wall of the middle shaft 3, and the coil 5 is sleeved on the outer wall of the stator core 4.

[0051] As can be seen from the above, the neodymium magnet 14 forms a high-magnetic-density permanent magnet field on the inner wall of the rotor ring 6, and when the airflow drives the rotor ring 6 to rotate, the permanent magnet array and the stator core 4 and the coil 5 fixed on the middle shaft 3 form an outer rotor radial magnetic flux structure, and the magnetic flux alternately passes through the stator teeth-coil to realize cutting magnetic induction line power generation.

[0052] As can be seen from the above, Figure 2It is known that the positioning component includes a plurality of positioning rods 8 fixedly disposed on the inner walls of the first duct shell 1 and the second duct shell 2, and an installation ring 9 is fixedly disposed on one end of each positioning rod 8, and the central shaft 3 is fixedly disposed on the inner wall of the plurality of installation rings 9.

[0053] As can be seen from the above, the positioning rod 8 and the mounting ring 9 rigidly connect the central shaft 3 and the duct housing into one unit, which not only ensures the air gap accuracy between the stator core 4 and the rotor ring 6, but also closes the reverse torque in the duct through the gear-support shaft 13 to achieve "internal force balance". The carrier (tower, vehicle body or ship body) only bears the net thrust and is not subjected to torque, which completely avoids the structural fatigue and shaking caused by unidirectional torque in traditional single-stage wind turbines.

[0054] Depend on Figure 1 , Figure 2 and Figure 4 It is known that in order to guide and accelerate the airflow into the second duct shell 2, the airflow guiding assembly includes first turbine blades 10 fixedly disposed on the outer wall of a plurality of rotor rings 6 located inside the first duct shell 1.

[0055] As can be seen from the above, by utilizing the structural characteristics of the first duct shell 1, the airflow is pre-rotated and the axial velocity is increased before entering the second duct shell 2, which is equivalent to providing "pre-rotation boost" for the second turbofan blade 7. The energy extraction efficiency of the two stages is superimposed, and the power density of the whole machine is increased by more than 40% compared with a single-stage ducted fan of the same diameter. At the same time, the blade tip blowing slot structure (hidden in the gap between the first turbofan blade 10, the second turbofan blade 7 and the duct) suppresses blade tip vortex leakage, further improving the wind energy to electricity conversion efficiency.

[0056] In summary, the working principle of the present application is as follows: the low-speed airflow from the outside first enters the horn-shaped first duct shell 1, is accelerated and straightened in the converging-diverging flow channel, the turbulence degree is reduced by more than 15%, and a high-speed, axial airflow with extremely strong axiality is formed; the airflow acts on the first vane 10 in the first duct shell 1, drives the rotor ring 6 to start rotating, realizes pre-rotation pressurization, and at the same time provides a stable and high-energy flow field for the subsequent stage; the airflow after pre-rotation enters the second duct shell 2, and at the same time pushes the two-stage second vane 7; since the end of each adjacent two-stage second vane 7 is fixedly connected with the first gear 11, and the first gear 11 and the second gear 12 are in planetary meshing through the common second gear 12 and the support shaft 13 fixed on the inner wall of the duct, when the first-stage second vane 7 rotates under the action of the wind, the power is transmitted through the first gear 11→the second gear 12→the other first gear 11, so that the second-stage second vane 7 instantaneously obtains an equal-speed reverse torque, thereby forming a pair of aerodynamic torques with equal size and opposite direction on the same axis, the torques are mutually cancelled in the closed loop of the gear-support shaft 13, and the carrier (tower, vehicle body, ship body or building facade) only bears the net axial thrust without net torque, thereby completely eliminating the structural fatigue, shaking and resonance of the traditional single-stage fan caused by the one-way torque; at the same time, the neodymium magnet 14 on the inner wall of the two-stage rotor ring 6 rotates reversely with the respective rotor ring 6, and forms an outer rotor radial flux structure with the stator core 4 and the coil 5 fixed on the middle shaft 3, so as to realize magnetic induction line cutting; the positioning rod 8 and the mounting ring 9 rigidly connect the middle shaft 3 and the duct shell, ensure the air gap precision, and directly close the remaining unbalanced torque in the duct, thereby further reducing the vibration; the blade tip of the first vane 10 and the second vane 7 and the duct are provided with a blowing gap, so as to inhibit the blade tip vortex leakage and improve the wind energy capture amount; through the above-mentioned multi-stage series connection, reverse balance and radial flux cooperation, the power density of the whole machine is increased by more than 40% compared with the single-stage duct fan with the same diameter, stable power generation with zero torsional vibration, low noise and high specific power is realized, and the needs of new energy automobile range extender, small ship, low-speed aircraft and high-rise building narrow space compensation power generation and other scenes are met.

[0057] Embodiment two:

[0058] A power generation method of a multi-stage ducted vane-axial fan power generation device, comprising the following steps:

[0059] S1. The low-speed airflow from the outside enters the horn-shaped first duct shell 1 and is accelerated and straightened in the converging-diverging flow channel;

[0060] Specifically, the device is installed and placed against the wind, so that the angle between the environmental wind speed direction and the first duct shell 1 axis is ≤±15°; the low-speed airflow from the outside is accelerated in the horn-shaped converging-diverging first duct shell 1 to the best tip speed ratio interval 6-8, and at the same time the turbulence degree is reduced by ≥15%, forming a high-speed, low-turbulence axial inflow;

[0061] S2. The airflow first acts on the first vane 10, drives the first vane 10 to rotate, and realizes pre-rotation pressurization;

[0062] Specifically, the airflow entering the first duct shell 1 first impacts the first vortex fan blade 10, drives the rotor ring 6 to rotate, and completes the first mechanical energy-electric energy conversion, while the first vortex fan blade 10 applies a circumferential pre-rotation to the airflow, so that the tangential velocity component of the airflow entering the second duct shell 2 increases by 20-30%, providing a “pre-rotation boost” flow field for the subsequent stage;

[0063] S3. The pre-rotated airflow enters the second duct shell 2, while pushing at least two stages of second vortex fan blades 7, and the adjacent two stages of rotor rings 6 are made to rotate in opposite directions at the same speed through the planetary reverse rotation mechanism, so as to eliminate the torque effect;

[0064] Specifically, the pre-rotated airflow simultaneously acts on at least two stages of second vortex fan blades 7, the first stage of second vortex fan blades 7 is rotated by the wind and outputs a torque T1, and through the planetary meshing of the first gear 11 fixed to the root of the blade→the second gear 12→the adjacent first gear 11, the second stage of second vortex fan blades 7 obtains a torque T2 equal in size and opposite in direction to T1, and |T1|=|T2|, the two torques are offset in the closed loop of the branch shaft 13, realizing zero net torque of the carrier, and the planetary reverse rotation mechanism ensures that the rotational speeds of the two stages of rotor rings 6 are equal and opposite, and the rotational speed difference Δn≤0.5%, avoiding additional bearing load;

[0065] S4. The neodymium magnets 14 on the inner wall of each rotor ring 6 move relative to the stator core 4 and coil 5 fixed to the central shaft 3, cut the magnetic induction lines to generate induced electromotive force, and realize multi-stage power generation;

[0066] Specifically, the neodymium magnets 14 on the inner wall of each rotor ring 6 form a uniform air gap of 0.8-1.2 mm with the stator core 4 fixed to the central shaft 3, and the reversely rotating neodymium magnets 14 alternately cut the stator coils 5 to generate three-phase symmetrical alternating current, the fundamental frequency f of which satisfies f=p·n / 60, where p is the number of magnetic poles, and the two stages of coils 5 are connected in “reverse series”, so that the electromotive forces with a phase difference of 180° are superimposed, the output voltage is increased by ≥15%, and the harmonic content is reduced;

[0067] S5. The alternating current output by the coil 5 is converted into stable direct current or power frequency alternating current through an external rectifier-inverter unit, and the electric energy collection and grid connection are completed;

[0068] Specifically, the three-phase alternating current output by the coil 5 is converted into a direct current bus voltage Vdc through a rectifier, and the excitation current is adjusted to zero (permanent magnet) through an MPPT algorithm, so as to only rely on the speed-load curve to track the maximum power point, ensure the wind energy utilization rate Cp≥0.45, and send the direct current into an inverter after being boosted by a Boost, and the direct current is inverted into a power frequency alternating current of 50Hz / 60Hz with a THD≤3%, so as to realize grid connection or independent load carrying.

[0069] In the drawings of the embodiments of the present application, only the structures related to the embodiments of the present application are involved, other structures can be referred to the general design, and in the case of no conflict, the same embodiments and different embodiments of the present application can be combined with each other.

[0070] Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-stage ducted turbofan generator, characterized in that: include A duct assembly; which includes a first duct shell (1) and a second duct shell (2) coaxially connected. A flow guiding component is disposed inside the first duct shell (1) and is used to guide external airflow into the second duct shell (2). A positioning component, wherein the positioning component is disposed inside the duct component; Central axis (3), the central axis (3) is set inside the duct assembly via a positioning component; Stator assembly, the stator assembly being disposed on the central shaft (3); Rotor rings (6), a plurality of said rotor rings (6) are rotatably disposed outside the stator assembly; Among them, a number of rotor rings (6) inside the second duct shell (2) are fixedly installed with second turbine blades (7) on their outer walls. Two adjacent second turbine blades (7) are fixedly connected to a first gear (11) at their opposite ends. A second gear (12) is meshed between the two first gears (11). A support shaft (13) is fixedly connected to the inner wall of the second duct shell (2). The second gear (12) is rotatably installed on the outer wall of the support shaft (13).

2. The multi-stage ducted turbofan generator according to claim 1, characterized in that: The first duct shell (1) has a trumpet-shaped structure.

3. The multi-stage ducted turbofan generator according to claim 1, characterized in that: The inner wall of the rotor ring (6) is fixedly equipped with several neodymium magnets (14) in a circumferential array.

4. The multi-stage ducted turbofan generator according to claim 1, characterized in that: The stator assembly includes a stator core (4) and a coil (5). A plurality of the stator cores (4) are arranged in a circular array on the outer wall of the central shaft (3), and the coil (5) is sleeved on the outer wall of the stator core (4).

5. A multi-stage ducted turbofan generator according to claim 1, characterized in that: The positioning component includes a plurality of positioning rods (8) fixedly disposed on the inner walls of the first duct shell (1) and the second duct shell (2). One end of each positioning rod (8) is fixedly disposed with an installation ring (9), and the central shaft (3) is fixedly disposed on the inner wall of the plurality of installation rings (9).

6. A multi-stage ducted turbofan generator according to claim 1, characterized in that: The flow guiding assembly includes a first turbofan blade (10) fixedly disposed on the outer wall of a plurality of rotor rings (6) located inside the first duct shell (1).

7. A power generation method based on the multi-stage ducted turbofan power generation device according to any one of claims 1-6, characterized in that, Includes the following steps: S1. The low-speed airflow from the outside enters the trumpet-shaped first duct shell (1) and is accelerated and rectified in the contraction-expansion flow channel; S2. The airflow first acts on the first turbine blade (10), driving the first turbine blade (10) to rotate, thus achieving pre-swirl boosting; S3. The pre-swirled airflow enters the second duct shell (2) and simultaneously drives at least two stages of second turbine blades (7). Through the planetary reversal mechanism, the adjacent two stages of rotor rings (6) rotate in opposite directions at the same speed to eliminate the torque effect. S4. The neodymium magnets (14) on the inner wall of each rotor ring (6) move relative to the stator core (4) and coil (5) fixed on the central shaft (3), cutting the magnetic field lines to generate induced electromotive force and realize multi-stage power generation; S5. The AC output of the coil (5) is converted into stable DC or power frequency AC by an external rectifier-inverter unit to complete the collection of electrical energy and grid connection.

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