Power generation exhaust nozzle, power generation control method and aero-engine

Abstract

The invention provides a power generation exhaust nozzle, a power generation control method and an aero-engine, and belongs to the technical field of aero-engines, the power generation exhaust nozzle comprises a second casing, a thermoelectric power generation sheet, a guide vane, a supporting plate and a rotating shaft, the supporting plate is arranged on the outer surface of the second casing, and the thermoelectric power generation sheet is connected to the end, away from the second casing, of the supporting plate; a plurality of rotating shafts are arranged between the second casing and the thermoelectric power generation sheet; one end, far away from the second casing, of each rotating shaft penetrates through the thermoelectric power generation sheet and is connected with a driving device; the multiple rotating shafts are installed at the end, close to the combustion chamber, of the second casing in the circumferential direction of the second casing. The guide vane is installed on the rotating shaft and located between the second casing and the thermoelectric power generation piece. The guide vane, the second casing and the thermoelectric power generation piece form an annular cavity, the thermoelectric power generation piece is arranged on the outer side of the second casing of the power generation exhaust nozzle, a second standby power source is provided for a numerical control system of an engine, and the working reliability, stability and safety of the engine control system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aeroengines, and particularly relates to a power generation tail nozzle, a method for controlling power generation, and an aeroengine. Background Art

[0002] As the central nervous system of an aeroengine, the numerical control system plays a crucial role. A normal numerical control system enables the aeroengine to operate stably and reliably under any environmental conditions and any working states. To ensure the stable operation of the numerical control system, a traditional engine is designed with a dual-redundancy power supply system (refer to Figure 1 ): The main power supply is the starting generator on the aeroengine, and the backup power supply is the airborne battery.

[0003] Under normal circumstances, the numerical control system is powered by the main power supply; when the main power supply fails, the airborne battery powers the numerical control system. However, in some special cases, if both the main power supply and the backup power supply fail, the engine will lose control and cause serious consequences.

[0004] The existing aeroengines are designed with high precision. When adding an additional backup power supply or designing another power generation device, a large amount of space is required, which will increase the gravity of the aeroengine and thus increase the manufacturing cost. Since the outer surface temperature of the engine tail nozzle can reach 300 - 500 °C during engine operation, and most importantly, when the engine fails and stops, the main power supply will lose its power generation ability due to the lack of engine drive, while the temperature of the tail nozzle drops very slowly, and it takes at least 20 minutes to drop from 300 °C to 100 °C.

[0005] Therefore, a tail nozzle capable of generating power through the heat of the tail nozzle is needed. Summary of the Invention

[0006] In view of the above problems, the present invention provides a power generation tail nozzle, which includes a second casing, a thermoelectric generator, guide vanes, support plates, and a rotating shaft. The outer surface of the second casing is provided with support plates, and one end of the support plate away from the second casing is connected with a thermoelectric generator; a plurality of rotating shafts are arranged between the second casing and the thermoelectric generator, and one end of the rotating shaft away from the second casing passes through the thermoelectric generator and is connected with a driving device; a plurality of rotating shafts are circumferentially installed at one end of the second casing close to the combustion chamber; the guide vanes are installed on the rotating shafts and are located between the second casing and the thermoelectric generator; the guide vanes, the second casing, and the thermoelectric generator form an annular cavity.

[0007] Furthermore, the power generation tail nozzle further includes a plurality of gears, and the plurality of gears are installed on the outer surface of the thermoelectric generator. The gears are connected with one end of the rotating shaft away from the second casing; adjacent gears mesh with each other.

[0008] Furthermore, the driving device is a servo motor.

[0009] A power generation tail pipe control power generation method, using the above-mentioned power generation tail pipe, includes the following steps:

[0010] Obtain the initial spatial angle θ1 between the plane of the guide vane and the axis of the second casing;

[0011] Obtain the first temperature inside the thermoelectric generator;

[0012] According to the first temperature, the driving device drives the guide vane to rotate to reduce θ1 and obtain the second spatial angle θ2;

[0013] Obtain the second temperature inside the thermoelectric generator and the first preset threshold;

[0014] According to the second temperature and the first preset threshold, the driving device drives the guide vane to rotate to obtain the third spatial angle θ3;

[0015] Obtain the main power supply status and determine whether to obtain the standby power supply status according to the main power supply status;

[0016] If the standby power supply status is obtained, the thermoelectric generator starts to generate power;

[0017] Determine whether to obtain the third temperature inside the thermoelectric generator according to the standby power supply status;

[0018] Control the power generation amount of the thermoelectric generator according to the third temperature.

[0019] Further, the step of obtaining the first temperature inside the thermoelectric generator, according to the first temperature, the driving device drives the guide vane to rotate to reduce θ1 and obtain the second spatial angle θ2 includes the following steps:

[0020] Obtain the first temperature t1 inside the thermoelectric generator and the first set temperature t m1 ;

[0021] If t1 ≤ t m1 , repeat the steps of obtaining the first temperature t1 inside the thermoelectric generator and the first set temperature t m1 ;

[0022] If t1 > t m1 , then the driving device drives the guide vane to rotate by an angle of θ m1 , and obtain the second spatial angle θ2 between the plane of the guide vane and the axis of the second casing at this time, θ2 = θ1 - θ m1 .

[0023] Further, the step of obtaining the second temperature inside the thermoelectric generator and the first preset threshold, according to the second temperature and the first preset threshold, the driving device drives the guide vane to rotate to obtain the third spatial angle θ3 includes the following steps:

[0024] Obtain the second temperature t2 inside the thermoelectric power generation chip, the second set temperature t m2 and the first preset threshold β1;

[0025] If Return to the step of obtaining the second temperature t2 inside the thermoelectric power generation chip, the second set temperature t m2 and the first preset threshold β1;

[0026] If Then compare t m2 and the size of t2,

[0027] If t2 > t m2 , then the driving device drives the guide vane to rotate, and the reduced rotation angle is θ m2 , obtaining the third spatial angle θ3 between the plane of the guide vane and the axis of the second casing at this time, θ3 = θ2 - θ m2 ;

[0028] If t2 ≤ t m2 , then the driving device drives the guide vane to rotate, and the increased rotation angle is θ m2 , obtaining the third spatial angle θ3 between the plane of the guide vane and the axis of the second casing at this time, θ3 = θ2 + θ m2 .

[0029] Furthermore, the steps of obtaining the main power supply state, determining whether to obtain the standby power supply state according to the main power supply state, and determining whether to obtain the third temperature inside the thermoelectric power generation chip according to the standby power supply state include the following steps:

[0030] Obtain the main power supply state. If the main power supply fails, the driving device drives the guide vane to rotate so that the spatial angle between the plane of the guide vane and the axis of the second casing is the initial spatial angle θ1, and the thermoelectric power generation chip starts to generate electricity;

[0031] If the main power supply state is good, then obtain the standby power supply state;

[0032] If the standby power supply fails, then obtain the third temperature inside the thermoelectric power generation chip;

[0033] If the standby power supply state is good, then execute the step of obtaining the second temperature and the first preset threshold inside the thermoelectric power generation chip.

[0034] Furthermore, the steps of controlling the power generation amount of the thermoelectric power generation chip according to the third temperature include the following steps:

[0035] Obtain the third temperature t3 inside the thermoelectric power generation chip, the third set temperature t m3 and the first preset threshold β1; where t m3 > t m2 ;

[0036] If Then return to obtain the third temperature t3 and the third set temperature t m3 and a first preset threshold value β1;

[0037] like Then compare t m3 and the size of t3,

[0038] If m3 >t3, the driving device drives the guide vane to rotate, and the angle of rotation is reduced to θ m3 , then the fourth spatial angle θ4 between the plane of the guide vane and the axial direction of the second casing is obtained, and the power generation of the temperature difference power generation sheet is controlled to decrease, where θ4 = θ3-θ m3 ;

[0039] If m3 ≤t3, the driving device drives the guide vane to rotate, and the rotation increases by an angle of θ m3 , then the fourth spatial angle θ4 between the plane of the guide vane and the axial direction of the second casing is obtained, and the power generation of the temperature difference power generation sheet is controlled to increase, where θ4=θ3+θ m3 .

[0040] An aircraft engine comprises an air inlet assembly, a combustion chamber, a turbine, a reducer and the above-mentioned power generation tail nozzle, wherein the outlet of the air inlet assembly is communicated with the inlet of the combustion chamber, a turbine is arranged in the outlet of the combustion chamber, and the power generation tail nozzle is installed at the outlet of the combustion chamber; the turbine is connected to the reducer through a shaft, and the reducer is located on the side of the air inlet assembly away from the power generation tail nozzle.

[0041] Furthermore, the aircraft engine also includes a centrifugal compressor, and the centrifugal compressor is arranged inside the air inlet assembly.

[0042] Beneficial effects of the present invention:

[0043] 1. The power generation tail nozzle of the present invention provides a second backup power supply for the engine's numerical control system by arranging a temperature difference power generation sheet on the outer side of the second casing, thereby improving the working reliability, stability and safety of the engine control system.

[0044] 2. The power generation tail nozzle of the present invention is provided with a guide vane between the second casing and the thermoelectric power generation sheet, and a gear is installed on the rotating shaft on which the guide vane is installed, and adjacent gears are meshed with each other; a driving device is connected to the rotating shaft in a transmission manner, and the guide vane is controlled to rotate by the driving device to adjust the angle of the guide vane, thereby controlling the jet to enter the gap to cool the inner surface of the thermoelectric power generation sheet, thereby protecting the thermoelectric power generation sheet; when the main power supply and the backup power supply fail, the guide vane is driven by the driving device to close the gap between the second casing and the thermoelectric power generation sheet, thereby reducing the cooling speed of the inner surface temperature of the thermoelectric power generation sheet and increasing the power generation time.

[0045] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 Shows a schematic power supply diagram of a numerical control system in the prior art.

[0048] Figure 2 Shows a schematic structural diagram of a power generation tail nozzle in an embodiment of the present invention.

[0049] Figure 3 Shows a schematic cross-sectional structural diagram of a power generation tail nozzle in an embodiment of the present invention.

[0050] Figure 4 Shows a schematic cross-sectional structural diagram of a power generation tail nozzle when the guide vane is closed in an embodiment of the present invention.

[0051] Figure 5 Shows a schematic cross-sectional structural diagram of a power generation tail nozzle when the guide vane is opened in an embodiment of the present invention.

[0052] Figure 6 Shows a schematic flow diagram of a control power generation method for a power generation tail nozzle in an embodiment of the present invention.

[0053] Figure 7 Shows a simple schematic diagram of the guide vane plane at the initial position and the axis of the second casing in an embodiment of the present invention.

[0054] Figure 8 Shows a simple schematic diagram of the guide vane plane and the axis of the second casing when the guide vane is fully opened in an embodiment of the present invention.

[0055] Figure 9 Shows a schematic diagram of the logical relationship of a control power generation method for a power generation tail nozzle in an embodiment of the present invention.

[0056] Figure 10 Shows a schematic diagram of an aeroengine in an embodiment of the present invention.

[0057] In the figure, 10 is the air inlet duct assembly; 20 is the centrifugal compressor; 30 is the combustion chamber; 40 is the turbine; 50 is the power generation tail nozzle; 51 is the first casing; 52 is the second casing; 53 is the thermoelectric power generation sheet; 54 is the guide vane; 55 is the support plate; 56 is the gear; 57 is the gap; 58 is the rotating shaft; 60 is the speed reducer. Detailed implementation manners

[0058] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] Embodiment 1

[0060] Reference Figure 2 , Figure 2 shows a schematic structural diagram of the power generation tail nozzle in the embodiment of the present invention. A power generation tail nozzle includes a second casing 52, a thermoelectric power generation sheet 53, guide vanes 54, support plates 55 and a rotating shaft 58. A support plate 55 is provided on the outer surface of the second casing 52. One end of the support plate 55 away from the second casing 52 is connected to a thermoelectric power generation sheet 53. The thermoelectric power generation sheets 53 are circumferentially arranged on the outer surface of the tail nozzle. There is a gap 57 between the second casing 52 and the thermoelectric power generation sheet 53 (reference Figure 3 ); A plurality of rotating shafts 58 are provided between the second casing 52 and the thermoelectric power generation sheet 53. One end of the rotating shaft 58 away from the second casing 52 passes through the thermoelectric power generation sheet 53 and is connected to a driving device; The driving device is installed on the outer surface of the thermoelectric power generation sheet 53 and is in transmission connection with one of the gears 56. The driving device is a servo motor, which can precisely control the rotation angle of the guide vane 54 to control the air intake volume on the inner surface of the thermoelectric power generation sheet 53 for adjusting the temperature on the inner surface of the thermoelectric power generation sheet 53. A plurality of rotating shafts 58 are installed circumferentially along the second casing 52 at one end of the second casing 52 and the thermoelectric power generation sheet 53 close to the engine; The guide vane 54 is installed on the rotating shaft 58 and is located between the second casing 52 and the thermoelectric power generation sheet 53. The guide vane 54, the second casing 52 and the thermoelectric power generation sheet 53 form an annular cavity. The power generation tail nozzle 50 further includes a first casing 51. The first casing 51 is located inside the second casing 52. The first casing 51 wraps the turbine 40 to protect the turbine 40; The turbine 40 is a part of the engine.

[0061] Specifically, on the basis of the traditional main power supply and standby power supply, the present invention provides a second standby power supply for the engine numerical control system by arranging a thermoelectric power generation sheet 53 on the outer surface of the second casing 52, improving the working reliability, stability and safety of the engine control system.

[0062] Specifically, according to experience, the surface temperature of the second casing 52 is 300 - 500 °C. Without surface jet cooling, solely affected by thermal radiation, the temperature gradually decreases with the increase of the distance outward in the vertical direction of the surface of the second casing 52. It drops to 200 - 300 °C at about 50 mm and to 100 - 200 °C at about 100 mm, with slight differences among different models. The jet temperature is generally the ambient temperature, ranging from - 30 °C to 50 °C. After being affected by the jet in the engine compartment, the surface temperature of the second casing 52 further decreases.

[0063] When a thermoelectric generator 53 is arranged on the outer surface of the second casing 52, one side of the thermoelectric generator 53 is affected by the high - temperature radiation inside, and the other side is affected by the jet outside. Their temperatures are T_inner and T_outer respectively, and the temperature difference between them can generate electricity continuously without shaft drive. Most importantly, when the engine fails and stops, the main power supply will lose its power generation ability due to the lack of engine drive, while the temperature of the tail pipe drops very slowly. It takes at least 20 minutes to drop from 300 °C to 100 °C. If the gap 57 between the thermoelectric generator 53 and the second casing 52 is blocked by setting the guide vane 54, this time will be even longer. Setting the guide vane 54 increases the power generation time and ensures the power generation amount. During this process, the thermoelectric generator 53 can still generate electricity continuously, and the power generation amount will not decrease in a short time, which can provide an emergency power supply for the numerical control system.

[0064] Furthermore, the power - generating tail pipe further includes a plurality of gears 56. The plurality of gears 56 are installed on the outer surface of the thermoelectric generator 53, and the gears 56 are connected to one end of the rotating shaft 58 far from the second casing 52; adjacent gears 56 mesh with each other. Specifically, through a driving device, all the guide vanes 54 can be driven, and further, the angle adjustment of the guide vanes 54 can be realized. Specifically, connecting multiple guide vanes 54 seals the gap 57 (refer to Figure 4 ) to the expansion of multiple guide vanes 54, making adjacent guide vanes 54 parallel to each other (refer to Figure 5 ). The above - mentioned adjustment angle reaches 90°, and the adjustment angle range is larger; thus, it is convenient for the jet to enter the gap 57 to cool the inner surface of the thermoelectric generator 53, and further protects the thermoelectric generator 53. Specifically, the driving device is a servo motor.

[0065] Embodiment 2,

[0066] Existing adjustable guide vane layout and control:

[0067] An adjustable guide vane 54 and an adjustable guide vane automatic control system are installed between the thermoelectric generator 53 and the second casing 52, and the inner - side surface temperature T_inner of the thermoelectric generator 53 is measured. The traditional guide vane is adjusted according to the gas generator speed, as shown in Table 1:

[0068] Table 1:

[0069]

[0070] However, this method is generally applicable to compressors. For the thermoelectric power generation of this solution, at the same gas generator speed, the T inside corresponding to different nozzle guide vane angles is inconsistent, resulting in a large drop in power generation, which restricts its working efficiency to a certain extent. To solve this problem and keep the nozzle in a high power generation efficiency all the time, this solution proposes a method for adjusting the nozzle guide vane based on temperature as the target, which is as follows:

[0071] 1) Selection of control target

[0072] To keep the nozzle in a high power generation for a long time, the guide vane angle should be automatically adjusted at different speeds to control the power generation of the thermoelectric power generation chip 53 to be 80% A (A is the maximum power generation of the thermoelectric power generation chip 53).

[0073] 2) Calibration of guide vane angle

[0074] Taking 80% A as the target, make the engine run at speeds of 80%, 85%... 105% etc. respectively, and manually adjust the guide vane angle until the T inside reaches 80% A, and record the guide vane angle at this time.

[0075] Table 2:

[0076]

[0077] 3) Setting of adjustment rule

[0078] Although the temperature calibration has been carried out (as shown in Table 2), however, affected by multiple factors such as the atmospheric environment and the flight state of the aircraft, even at the calibrated guide vane angle, the T inside cannot always be stable at 80% A.

[0079] Reference Figure 6 , this invention proposes a method for controlling power generation of a power generation nozzle, which automatically adjusts the angle of the guide vane 54 to reach the target value of 80% A. It includes the following steps:

[0080] Obtain the initial spatial angle θ1 between the plane of the guide vane 54 and the axis of the second casing 52. θ1 is 90° (refer to Figure 7 , Figure 7 In, the plane of the guide vane 54 (taking the A direction in Figure 7 as an example) and the axis of the second casing 52 (taking the B direction in Figure 7 as an example, the B direction is the direction perpendicular to the paper surface) has a spatial angle θ1 of 90°, that is, the B direction is perpendicular to the plane of the guide vane 54); at this time, all the guide vanes 54 form a ring-shaped plate, and seal one end of the gap 57 close to the engine (refer to Figure 2 ). Refer to Figure 8, when the plane where the guide vane 54 rotates is axially parallel to the second casing 52, direction C is a direction of the plane of the guide vane 54, and direction D is the axis of the second casing 52, this is the maximum amount of jet flow entering.

[0081] Obtain the first temperature inside the thermoelectric power generation sheet 53;

[0082] According to the first temperature, the driving device drives the guide vane 54 to rotate to reduce θ1 and obtain the second spatial angle θ2;

[0083] Obtain the second temperature inside the thermoelectric power generation sheet 53 and the first preset threshold;

[0084] According to the second temperature and the first preset threshold, the driving device drives the guide vane 54 to rotate to obtain the third spatial angle θ3;

[0085] Obtain the main power supply status and determine whether to obtain the backup power supply status according to the main power supply status;

[0086] If the backup power supply status is obtained, the thermoelectric power generation sheet 53 starts to generate electricity;

[0087] Determine whether to obtain the third temperature inside the thermoelectric power generation sheet 53 according to the backup power supply status;

[0088] Control the power generation amount of the thermoelectric power generation sheet 53 according to the third temperature.

[0089] Further, obtaining the first temperature inside the thermoelectric power generation sheet 53, and according to the first temperature, the driving device drives the guide vane 54 to rotate to reduce the initial spatial angle θ1 to obtain the second spatial angle θ2 includes the following steps:

[0090] Reference Figure 9 , obtain the first temperature t1 inside the thermoelectric power generation sheet 53 and obtain the first set temperature t m1 ; Specifically, set the maximum allowable temperature that the inner surface of the thermoelectric power generation sheet 53 can withstand to be A. Then, in the process of use, in order to ensure the durability and safety of the thermoelectric power generation sheet 53, the maximum allowable temperature of the thermoelectric power generation sheet 53 is 80% of A, that is, the temperature of 80% A, and the first set temperature t m1 = 80% A.

[0091] If t1 ≤ t m1 , repeat the steps of obtaining the first temperature t1 inside the thermoelectric power generation sheet 53 and the first set temperature t m1 ; Specifically, when the first temperature t1 does not exceed 80% of the maximum allowable temperature, the initial spatial angle θ1 between the plane of the guide vane 54 and the axis of the second casing 52 is continued to be maintained, and θ1 is 90°.

[0092] If t1 > t m1, the driving device drives the guide vane 54 to rotate by an angle of θ m1 , then the second space angle θ2 between the plane of the guide vane 54 and the axis of the second casing 52 at this time is obtained, θ2 = θ1 - θ m1 ;

[0093] Specifically, if the temperature exceeds 80% of the maximum temperature that the thermoelectric power generation chip 53 can withstand, the driving device drives the guide vane 54 to rotate to reduce θ1 by θ m1 , where θ m1 can be 5°, 10°, 15°, etc., to obtain θ2, increase the jet flow rate, reduce the inner surface temperature of the thermoelectric power generation chip 53, and protect the thermoelectric power generation chip 53.

[0094] In the implementation of the present invention, obtaining the second temperature inside the thermoelectric power generation chip 53, obtaining the first preset threshold, and driving the guide vane 54 to rotate according to the second temperature and the first preset valve to obtain θ3 includes the following steps:

[0095] Obtain the second temperature t2 inside the thermoelectric power generation chip 53, the second set temperature t m2 and the first preset threshold β1; specifically, the second temperature t2 is the temperature of the inner surface of the thermoelectric power generation chip 53 at this time, and the second set temperature t m2 is 80% of the maximum temperature A that the thermoelectric power generation chip 53 can withstand, that is, the temperature of 80% A, and the second set temperature t m2 = 80% A. β1 is a preset threshold, and it is recommended to take a value of 0 to 0.01; preferably 0.005 to 0.01.

[0096] If then return to the step of obtaining the second temperature t2 inside the thermoelectric power generation chip 53, the second set temperature t m2 and the first preset threshold β1;

[0097] If then compare the magnitudes of t m2 and t2,

[0098] If t2 > t m2 , the driving device drives the guide vane 54 to rotate, and the angle of rotation reduction is θ m2 , then the third space angle θ3 between the plane of the guide vane (54) and the axis of the second casing (52) at this time is obtained, θ3 = θ2 - θ m2 ; specifically, if the temperature exceeds 80% of the maximum temperature that the thermoelectric power generation chip 53 can withstand, the driving device drives the guide vane 54 to rotate to reduce θ2 by θ m2 , where θ m2 can be 5°, 10°, 15°, etc., to obtain θ3, increase the jet flow rate, reduce the inner surface temperature of the thermoelectric power generation chip 53, and protect the thermoelectric power generation chip 53.

[0099] If t2 ≤ t m2 , the driving device drives the guide vane 54 to rotate, and the rotation increases the angle by θ m2 , then the third spatial angle θ3 between the plane of the guide vane 54 and the axis of the second casing 52 at this time is obtained, and θ3 = θ2 + θ m2 . Specifically, if the temperature does not exceed 80% of the maximum tolerable temperature of the thermoelectric power generation chip 53, the driving device drives the guide vane 54 to rotate to increase θ2 by θ m2 , where θ m2 can be 5°, 10°, 15°, etc., to obtain θ3, reduce the jet flow rate, increase the inner surface temperature of the thermoelectric power generation chip 53, and increase the power generation.

[0100] Further, obtaining the main power supply state, obtaining the standby power supply state according to the main power supply state, and determining whether to obtain the third temperature inside the thermoelectric power generation chip 53 according to the standby power supply state include the following steps:

[0101] Obtain the main power supply state. If the main power supply fails, the driving device drives the guide vane 54 to rotate so that the spatial angle between the plane of the guide vane 54 and the axis of the second casing 52 is the third spatial angle θ1, and the thermoelectric power generation chip 53 starts to generate electricity; specifically, when the main power supply fails, it means the engine fails, so closing the guide vane 54 can ensure that the inner surface of the thermoelectric power generation chip 53 cools down slowly, thereby ensuring sufficient power generation.

[0102] If the main power supply state is good, obtain the standby power supply state;

[0103] If the standby power supply fails, obtain the third temperature inside the thermoelectric power generation chip 53;

[0104] If the standby power supply state is good, execute the steps of obtaining the second temperature inside the thermoelectric power generation chip 53 and the first preset threshold.

[0105] Further, controlling the power generation of the thermoelectric power generation chip 53 according to the third temperature includes the following steps:

[0106] Obtain the third temperature t3 inside the thermoelectric power generation chip 53, obtain the third set temperature t m3 and the first preset threshold β1; where t m3 > t m2 ;

[0107] Specifically, the third temperature t3 is the current temperature of the inner surface of the thermoelectric power generation chip 53, and the third set temperature t m3 is 95% of the maximum tolerable temperature A of the thermoelectric power generation chip 53, that is, the temperature of 95%A. β1 is a preset threshold, and it is recommended to take a value of 0.005 - 0.01.

[0108] If Then return the steps of obtaining the third temperature t3 inside the thermoelectric power generation chip 53, the third set temperature t m3 and the first preset threshold β1;

[0109] If then compare t m3 with t3,

[0110] If t3 > t m3 , the driving device drives the guide vane 54 to rotate, and the reduced rotation angle is θ m3 , then obtain the fourth spatial angle θ4 between the plane of the guide vane 54 and the axis of the second casing 52 at this time, and control the power generation of the thermoelectric power generation chip 53 to decrease, where θ4 = θ3 - θ m3 ; Specifically, if the temperature exceeds 95% of the maximum temperature that the thermoelectric power generation chip 53 can withstand, the driving device drives the guide vane 54 to rotate to reduce θ3 by θ m3 , where θ m3 can be 5°, 10°, 15°, etc., obtain θ4, increase the jet flow rate, reduce the inner surface temperature of the thermoelectric power generation chip 53, and protect the thermoelectric power generation chip 53.

[0111] If t3 ≤ t m3 , the driving device drives the guide vane 54 to rotate, and the increased rotation angle is θ m3 , then obtain the fourth spatial angle θ4 between the plane of the guide vane 54 and the axis of the second casing 52 at this time, and control the power generation of the thermoelectric power generation chip 53 to increase, where θ4 = θ3 + θ m3 . Specifically, if the temperature does not exceed 95% of the maximum temperature that the thermoelectric power generation chip 53 can withstand, the driving device drives the guide vane 54 to rotate to increase θ3 by θ m3 , where θ m3 can be 5°, 10°, 15°, etc., obtain θ4, reduce the jet flow rate, increase the inner surface temperature of the thermoelectric power generation chip 53, and increase the power generation.

[0112] When the backup power supply fails, in order to ensure navigation safety, the thermoelectric power generation chip 53 needs to generate sufficient power. Therefore, the maximum temperature that the thermoelectric power generation chip 53 can withstand is adjusted from 80% A to 95% A, thereby increasing the power generation and ensuring that if the main power supply suddenly fails, the thermoelectric power generation chip 53 can generate sufficient power for the engine numerical control system to use.

[0113] Example 3,

[0114] Reference Figure 10, an aeroengine, comprising an air intake duct assembly 10, a combustion chamber 30, a turbine 40, a speed reducer 60 and the power generation tail nozzle 50 of Embodiment 1. The outlet of the air intake duct assembly 10 is communicated with the inlet of the combustion chamber 30. A turbine 40 is arranged in the outlet of the combustion chamber 30, and a power generation tail nozzle 50 is installed at the outlet of the combustion chamber 30. The turbine 40 is connected to the speed reducer 60 through a shaft, and the speed reducer 60 is located on the side of the air intake duct assembly 10 away from the power generation tail nozzle 50.

[0115] Furthermore, the aeroengine further comprises a centrifugal compressor 20, and the centrifugal compressor 20 is arranged inside the air intake duct assembly 10. Specifically, the centrifugal compressor 20 is used for compressing air, thereby increasing the air intake.

[0116] Working principle: When the turboprop engine operates, air flow enters from the inlet of the air intake duct assembly 10, is compressed by the centrifugal compressor 20 and enters the combustion chamber 30, burns with fuel in the combustion chamber 30, forms high-temperature and high-pressure gas and then enters the turbine 40 to expand and do work. The power is transmitted to the output shaft through the speed reducer 60 to provide power for the aircraft, and the exhaust gas is discharged through the power generation tail nozzle 50. The heat of the exhaust gas is used to heat the thermoelectric generation chip 53, thereby enabling the thermoelectric generation chip 53 to generate electricity.

[0117] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power generation tail nozzle, characterized in that, It includes a second casing (52), a thermoelectric generator (53), guide vanes (54), a strut (55) and a rotating shaft (58). The outer surface of the second casing (52) is provided with a strut (55), and one end of the strut (55) away from the second casing (52) is connected to a thermoelectric generator (53); a number of rotating shafts (58) are arranged between the second casing (52) and the thermoelectric generator (53), and one end of the rotating shaft (58) away from the second casing (52) passes through the thermoelectric generator (53) and is connected to a driving device; a number of rotating shafts (58) are circumferentially installed at one end of the second casing (52) close to the combustion chamber along the circumference of the second casing (52); the guide vanes (54) are installed on the rotating shafts (58) and are located between the second casing (52) and the thermoelectric generator (53); the guide vanes (54), the second casing (52) and the thermoelectric generator (53) form an annular cavity.

2. The power generation tail pipe according to claim 1, characterized in that, The power generation tailpipe further includes a number of gears (56), and a number of the gears (56) are installed on the outer surface of the thermoelectric generator (53), and the gears (56) are connected to one end of the rotating shaft (58) away from the second casing (52); adjacent gears (56) are meshed with each other.

3. A power generation tail nozzle according to claim 1 or 2, characterized in that, The driving device is a servo motor.

4. A power generation method for controlling a power generation tailpipe, characterized in that, Using the power generation tailpipe according to any one of claims 1-3, includes the following steps: Obtain the initial spatial angle θ1 between the plane of the guide vane (54) and the axis of the second casing (52). Obtain the first temperature inside the thermoelectric generator (53). According to the first temperature, the driving device drives the guide vane (54) to rotate to reduce θ1, and obtain the second spatial angle θ2. Obtain the second temperature inside the thermoelectric generator (53) and the first preset threshold. According to the second temperature and the first preset threshold, the driving device drives the guide vane (54) to rotate, and obtain the third spatial angle θ3. Obtain the main power supply state, and determine whether to obtain the standby power supply state according to the main power supply state. If the standby power supply state is obtained, the thermoelectric generator (53) starts to generate electricity. Determine whether to obtain the third temperature inside the thermoelectric generator (53) according to the standby power supply state. Control the power generation amount of the thermoelectric generator (53) according to the third temperature.

5. A power generation tailpipe control power generation method according to claim 4, characterized in that The step of obtaining the first temperature inside the thermoelectric generator (53), according to the first temperature, the driving device drives the guide vane (54) to rotate to reduce θ1, and obtain the second spatial angle θ2 includes the following steps: Obtain the first temperature t1 inside the thermoelectric power generation sheet (53) and the first set temperature t m1 ; If t1 ≤ t m1 , repeat the steps of obtaining the first temperature t1 inside the thermoelectric power generation sheet (53) and the first set temperature t m1 ; If t1 > t m1 , the driving device drives the guide vane (54) to rotate by an angle of θ m1 , and the second space angle θ2 between the plane of the guide vane (54) and the axis of the second casing (52) at this time is obtained, where θ2 = θ1 - θ m1 .

6. A power generation tailpipe control power generation method according to claim 5, characterized in that The step of obtaining the second temperature inside the thermoelectric generator (53) and the first preset threshold, according to the second temperature and the first preset threshold, the driving device drives the guide vane (54) to rotate, and obtain the third spatial angle θ3 includes the following steps: Obtain the second temperature t2 inside the thermoelectric power generation sheet (53) and the second set temperature t m2 and the first preset threshold β1; If Return the step of obtaining the second temperature t2 inside the thermoelectric power generation sheet (53), the second set temperature t m2 And the first preset threshold β1; If then compare t m2 with t2 in terms of magnitude. If t2 > t m2 , the driving device drives the guide vane (54) to rotate, and the reduced rotation angle is θ m2 , and the third space angle θ3 between the plane of the guide vane (54) and the axis of the second casing (52) at this time is obtained. θ3 = θ2 - θ 22 ; If t2 ≤ t m2 , the driving device drives the guide vane (54) to rotate, and the rotation increases by an angle of θ m2 , and the third spatial angle θ3 between the plane of the guide vane (54) and the axis of the second casing (52) at this time is obtained. θ3 = θ2 + θ m2 。 7. A power generation tailpipe control power generation method according to claim 4, characterized in that The step of obtaining the main power supply state, determining whether to obtain the standby power supply state according to the main power supply state, and determining whether to obtain the third temperature inside the thermoelectric generator (53) according to the standby power supply state includes the following steps: Obtain the main power supply state. If the main power supply fails, the driving device drives the guide vane (54) to rotate so that the spatial angle between the plane of the guide vane (54) and the axis of the second casing (52) is the initial spatial angle θ1, and the thermoelectric generator (53) starts to generate electricity. If the main power supply state is good, obtain the standby power supply state. If the backup power supply fails, obtain the third temperature inside the thermoelectric generator (53); If the backup power supply is in good condition, perform the steps of obtaining the second temperature inside the thermoelectric generator (53) and the first preset threshold value.

8. A power generation tail pipe control power generation method according to claim 4, characterized in that, Controlling the power generation amount of the thermoelectric generator (53) according to the third temperature includes the following steps: Obtain the third temperature t3 inside the thermoelectric power generation sheet (53) and the third set temperature t m3 and the first preset threshold β1; where t m3 > t m2 ; If then return the steps of obtaining the third temperature t3 inside the thermoelectric power generation sheet (53), the third set temperature t m3 and the first preset threshold β1; If then compare t m3 with t3 in terms of size. If t m3 > t3, the driving device drives the guide vane (54) to rotate, and the reduced rotation angle is θ m3 , then the fourth space angle θ4 between the plane of the guide vane (54) and the axis of the second casing (52) at this time is obtained, and the power generation of the thermoelectric power generation sheet (53) is controlled to decrease, where θ4 = θ3 - θ m3 ; If t m3 ≤ t3, the driving device drives the guide vane (54) to rotate, and the rotation increases the angle by θ m3 , then the fourth space angle θ4 between the plane of the guide vane (54) and the axis of the second casing (52) at this time is obtained, and the power generation of the thermoelectric power generation sheet (53) is controlled to increase, where θ4 = θ3 + θ m3 .

9. An aeroengine, characterized in that, It includes an air intake duct assembly (10), a combustion chamber (30), a turbine (40), a speed reducer (60), and an exhaust nozzle for power generation (50) according to any one of claims 1-3. The outlet of the air intake duct assembly (10) is communicated with the inlet of the combustion chamber (30). A turbine (40) is provided in the outlet of the combustion chamber (30), and an exhaust nozzle for power generation (50) is installed at the outlet of the combustion chamber (30). The turbine (40) is connected to the speed reducer (60) through a shaft, and the speed reducer (60) is located on the side of the air intake duct assembly (10) away from the exhaust nozzle for power generation (50).

10. An aero-engine according to claim 9, characterized in that, The aeroengine further includes a centrifugal compressor (20), and the centrifugal compressor (20) is arranged inside the air intake duct assembly (10).

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