Combustion augmentation type oil-electric hybrid ducted fan engine

Abstract

The invention provides a combustion augmentation type oil-electric hybrid ducted fan engine, and belongs to the field of aircraft power devices. The problems that an existing hybrid power system is additionally provided with a motor, a generator and other devices on the basis of a traditional engine, the structure is complex, and the weight and the size are large are solved. The engine comprises an air inlet channel, a fan pressurizing structure, an afterburning structure and an exhaust nozzle, a fan comprises a fan rotor and a fan stator, a shell is connected with the air inlet channel, the fan stator is fixedly arranged on the shell, the fan rotor is rotationally arranged on the fan stator, a driving motor can drive the fan rotor to rotate, and a battery is used for supplying power to the driving motor; the afterburning structure comprises a combustion chamber barrel, a central cone, a flame stabilizer and a fuel nozzle, the combustion chamber barrel is connected with the shell, the large end of the central cone is fixedly connected with the fan stator, the flame stabilizer is fixedly arranged in the combustion chamber barrel, and the fuel nozzle is arranged on the flame stabilizer; the combustion chamber barrel is connected with the exhaust nozzle. The engine is simple in structure, small in size and light in weight.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft power devices, and in particular relates to a combustion afterburner type oil-electric hybrid ducted fan engine. Background Art

[0002] As one of the most difficult industries to achieve decarbonization, the aviation transportation industry has increasingly prominent structural contradictions in green transformation. The performance improvement of traditional power systems represented by turbofan engines has gradually approached the asymptote because the combustion temperature is close to the chemical limit. In addition, petroleum fuel is a non-renewable resource, which is restricted by factors such as resource shortage and large carbon emissions. Therefore, more revolutionary improvements must be considered to meet the new needs of society and the market for aviation engines. At present, the performance of batteries has been greatly improved, but its specific energy is still significantly lower than that of fuel, which will bring too heavy additional load to electric propulsion aircraft, resulting in a significant reduction in its commercial load or an increase in aircraft energy consumption. At the same time, due to the constraints of battery energy density, the endurance of electric propulsion aircraft will also be limited, which will affect flight time and range. Hybrid propulsion complements the advantages of gas turbine engines and electric propulsion. On the one hand, it can partially avoid the quality penalty brought by low-specific energy batteries, and on the other hand, it can provide auxiliary power through gas turbine engines to alleviate the performance degradation of electric propulsion systems in high-power segments. In addition, hybrid propulsion systems can also select alternative clean fuels such as aviation kerosene, liquid hydrogen, methane, and ethanol. Therefore, under the premise of achieving carbon reduction, the research on hybrid propulsion systems has the most practical engineering value at this stage, and can relatively easily integrate multiple energy sources and multiple power architectures to maximize the overall advantages.

[0003] The current hybrid power system uses the electric propulsion system as the power source and the fuel system as the auxiliary power source, which can improve the engine thrust performance in a short time during the high power demand stage. However, the entire hybrid power system contains multiple power components. On the basis of the traditional engine, electric motors, batteries, generators, transmission mechanisms and other devices are added. The mechanical structure is complex, and the weight and volume of the system are increased, which increases the difficulty of control. It is mainly used in large passenger aircraft and cannot meet the needs of small and medium-sized aircraft. Summary of the invention

[0004] In view of this, in order to solve the problem that the existing hybrid power system includes multiple power components, electric motors, batteries, generators, transmission mechanisms and other devices are added on the basis of traditional engines, the mechanical structure is complex, and the weight and volume of the system are increased, which increases the difficulty of control. It is mainly used in large passenger aircraft and cannot meet the needs of small and medium-sized aircraft. The present invention proposes a combustion afterburner oil-electric hybrid ducted fan engine.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A combustion afterburner type oil-electric hybrid ducted fan engine, comprising: Air intake; A fan supercharging structure, the fan supercharging structure comprising a battery, a drive motor, a housing and a fan, the fan comprising a fan rotor and a fan stator, the housing being connected to the air inlet duct, the fan stator being fixedly arranged on the housing, the fan rotor being rotatably arranged on the fan stator, the fan rotor and the fan stator being coaxially arranged, the drive motor being located in the air inlet duct, the drive motor being able to drive the fan rotor to rotate, and the battery being used to supply power to the drive motor; An afterburner structure, the afterburner structure comprising a combustion chamber barrel, a center cone, a flame stabilizer and a fuel nozzle, the combustion chamber barrel is connected to the shell, the large end of the center cone is fixedly connected to the fan stator, the flame stabilizer is fixedly arranged in the combustion chamber barrel, the fan stator, the center cone and the flame stabilizer are coaxially arranged, and the fuel nozzle is arranged on the flame stabilizer; A tail nozzle, the combustion chamber barrel is connected to the tail nozzle.

[0006] As a preferred embodiment of the above-mentioned combustion afterburning oil-electric hybrid ducted fan engine, the combustion afterburning oil-electric hybrid ducted fan engine also includes a central air duct, which is fixedly arranged in the air inlet duct, and the drive motor is located in the central air duct, and the central air duct has a hemispherical cover body at one end close to the air inlet end of the air inlet duct, and a plurality of air vents are arranged on the hemispherical cover body at intervals.

[0007] As a preferred solution of the above-mentioned combustion afterburning oil-electric hybrid ducted fan engine, the flame stabilizer includes an inner ring flame stabilizer and an outer ring flame stabilizer, and a plurality of fuel nozzles are arranged on the inner ring flame stabilizer and the outer ring flame stabilizer.

[0008] As a preferred solution of the above-mentioned combustion afterburner type hybrid ducted fan engine, the inner ring flame stabilizer and the outer ring flame stabilizer are both annular stabilizers with V-shaped cross-sections.

[0009] As a preferred solution of the above-mentioned combustion afterburner type hybrid ducted fan engine, the radius of the inner ring flame stabilizer is smaller than the radius of the outer ring flame stabilizer.

[0010] As a preferred solution of the above-mentioned combustion-assisted oil-electric hybrid ducted fan engine, the combustion-assisted oil-electric hybrid ducted fan engine also includes a plurality of rectifying support plates, which are fixedly arranged on the combustion chamber cylinder along the circumferential direction of the central cone, and the inner ring flame stabilizer and the outer ring flame stabilizer are both fixedly connected to the plurality of rectifying support plates.

[0011] As a preferred solution of the above-mentioned combustion afterburning oil-electric hybrid ducted fan engine, the tail nozzle is a convergent nozzle.

[0012] As a preferred solution of the above-mentioned combustion afterburning oil-electric hybrid ducted fan engine, the central cone is a curved wall cone.

[0013] As a preferred solution of the above-mentioned combustion-afterburning oil-electric hybrid ducted fan engine, the combustion-afterburning oil-electric hybrid ducted fan engine also includes a supporting structure, and the fan stator is fixed to the casing through the supporting structure.

[0014] As a preferred solution of the above-mentioned combustion afterburner hybrid ducted fan engine, the drive motor transmits power coaxially with the fan rotor or transmits power via a transmission mechanism.

[0015] Compared with the prior art, the combustion afterburner oil-electric hybrid ducted fan engine provided by the present invention has the following beneficial effects: 1. The present invention provides a combustion afterburning oil-electric hybrid ducted fan engine. After the drive motor is started, the air passes through the air inlet and is compressed by the fan supercharging structure, then enters the combustion chamber barrel, mixes with the atomized fuel sprayed from the fuel nozzle and burns to produce high-temperature combustion gas, and finally expands and accelerates through the tail nozzle and sprays backward at high speed, and the reaction force generated generates thrust. The battery supplies power to the drive motor, starts the drive motor to drive the fan rotor to rotate, and the fan rotor does work on the incoming air to increase its total pressure. The fan stator adjusts the airflow with a deflection angle flowing out of the fan rotor outlet to the axial direction and increases its static pressure. The high total pressure air enters the fan stator to change its airflow direction and increase its static pressure.

[0016] 2. The present invention provides a combustion-afterburning oil-electric hybrid ducted fan engine. The combustion-afterburning oil-electric hybrid ducted fan engine combines the advantages of high power density of thermal engines and electric propulsion, thereby avoiding the performance degradation of the electric propulsion system in high-power segments and ensuring sufficient propulsion power, while reducing pollution emissions and energy consumption.

[0017] 3. The present invention provides a combustion-assisted, oil-electric hybrid ducted fan engine. The combustion-assisted, oil-electric hybrid ducted fan engine has a simple structure. Compared with an aviation gas turbine, the power system of the fan engine has only one rotating part and avoids the most complex high-temperature rotating parts in the impeller machinery, greatly reducing the difficulty of maintenance and manufacturing costs.

[0018] 4. The present invention provides a combustion-afterburning oil-electric hybrid ducted fan engine. The combustion-afterburning oil-electric hybrid ducted fan engine is integrated as a whole. Compared with conventional oil-electric hybrid systems, it is small in size, light in weight, does not require complex transmission components, and has simple system control. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a combustion afterburning oil-electric hybrid ducted fan engine provided by a specific embodiment of the present invention along a first viewing angle; Figure 2 is a structural schematic diagram of a combustion afterburner oil-electric hybrid ducted fan engine provided by a specific embodiment of the present invention along a second viewing angle; Figure 3 It is a structural schematic diagram of a combustion afterburner oil-electric hybrid ducted fan engine provided by a specific embodiment of the present invention along a third viewing angle.

[0020] In the figure: 1. Air intake; 2. Center air guide cover; 21. Ventilation hole; 3. Fan boost structure; 31. Drive motor; 32. Fan rotor; 33. Fan stator; 34. Housing; 4. Afterburner structure; 41. Inner ring flame stabilizer; 42. Outer ring flame stabilizer; 43. Center cone; 44. Fuel nozzle; 45. Combustion chamber cylinder; 5. Tail nozzle; 6. Support structure; 7. Rectifier support plate. DETAILED DESCRIPTION The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0021] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0024] See also Figure 1-3 The present embodiment is described. The present invention provides a combustion afterburning oil-electric hybrid ducted fan engine. The combustion afterburning oil-electric hybrid ducted fan engine includes an air inlet 1, a fan boost structure 3, an afterburning combustion structure 4 and a tail nozzle 5 arranged in sequence. The fan boost structure 3 includes a battery, a drive motor 31, a housing 34 and a fan. The fan includes a fan rotor 32 and a fan stator 33. The housing 34 is connected to the air inlet 1. The fan stator 33 is fixedly arranged on the housing 34. The fan rotor 32 is rotatably arranged on the fan stator 33. The fan rotor 32 and the fan stator 33 are coaxially arranged. The drive motor 31 is located in the air inlet 1, and the drive motor 31 can drive the fan rotor 32 to rotate. The battery is used to power the drive motor 31; the afterburner structure 4 includes a combustion chamber barrel 45, a center cone 43, a flame stabilizer and a fuel nozzle 44. The combustion chamber barrel 45 is connected to the outer shell 34, and the large end of the center cone 43 is fixedly connected to the fan stator 33. The flame stabilizer is fixedly arranged in the combustion chamber barrel 45, the fan stator 33, the center cone 43 and the flame stabilizer are coaxially arranged, and the fuel nozzle 44 is arranged on the flame stabilizer; the combustion chamber barrel 45 is connected to the tail nozzle 5.

[0025] In the combustion afterburning oil-electric hybrid ducted fan engine, after the drive motor 31 is started, the air passes through the air inlet 1 and is compressed by the fan supercharging structure 3, then enters the combustion chamber barrel 45, mixes with the atomized fuel sprayed from the fuel nozzle 44 and burns to produce high-temperature combustion gas, which is finally expanded and accelerated through the tail nozzle 5 and sprayed backward at high speed, and the reaction force generated generates thrust. The fan is composed of a fan rotor 32 and a fan stator 33. The fan rotor 32 is connected to the drive motor 31 and driven by the drive motor 31 to do work on the incoming gas flow. The drive motor 31 uses a battery as a power source to drive the fan rotor 32 to rotate. Both the fan rotor 32 and the fan stator 33 have a plurality of blades arranged circumferentially to change the relative motion direction and speed of the airflow. The fan stator 33 is a fixed component, and the fan stator 33 adjusts the airflow with a deflection angle flowing out of the outlet of the fan rotor 32 to the axial direction and increases its static pressure. The fan rotor 32 performs work on the air entering from the air inlet 1 to increase its total pressure. The high total pressure air enters the fan stator 33 to change its airflow direction and increase its static pressure. The central cone 43 is fixed to the rear end of the fan stator 33. The cone wall of the central cone 43 and the inner wall of the combustion chamber barrel 45 form a diffusion section to decelerate and diffuse the gas entering the combustion chamber barrel 45.

[0026] The combustion afterburner oil-electric hybrid ducted fan engine is mainly used in short-distance low-altitude aircraft to provide thrust for the take-off, landing and cruising of the aircraft. The oil-electric hybrid engine has the characteristics of energy saving, environmental protection and low noise, so the application of this structure to the aircraft can effectively reduce the emission of carbon dioxide. In addition, this structure can further improve the thrust through the afterburner combustion structure 4, which reduces the limitation brought by the battery energy density compared with pure electric propulsion, thereby improving the range and endurance of the aircraft.

[0027] The combustion afterburner oil-electric hybrid ducted fan engine integrates the fuel system and the electric propulsion system, removes the traditional turbine engine and generator from the entire system, and uses the afterburner combustion structure 4 as the auxiliary power of the electric propulsion system. The basic power is provided by the battery, which reduces the overall volume, simplifies the entire structure, and greatly reduces the weight of the whole machine. At the moment of vigorously developing the "low-altitude economy", it can better adapt to the needs of society and the market.

[0028] In this embodiment, the driving motor 31 and the fan rotor 32 transmit power coaxially or through a transmission mechanism.

[0029] In this embodiment, the fan stator 33 is fixed to the housing 34 by the support structure 6, and the shaft system of the fan rotor 32 is supported inside the stator wheel disc by the bearing structure.

[0030] In this embodiment, the fan boost structure 3, the afterburner structure 4, and the tail nozzle 5 are coaxially arranged in sequence, and there is a smooth transition between the components to ensure efficient flow of air.

[0031] In this embodiment, the combustion afterburner hybrid ducted fan engine also includes a support structure 6, the fan stator 33 is fixed to the casing 34 through the support structure 6, the center cone 43 is fixed to the rear of the support structure 6, and the center cone 43 is coaxially arranged with the fan stator 33.

[0032] Optionally, the combustion afterburner hybrid ducted fan engine also includes a central air shroud 2, which is fixedly disposed in the air inlet duct 1, and the drive motor 31 is located in the central air shroud 2. The central air shroud 2 has a hemispherical cover body at one end close to the air inlet end of the air inlet duct 1, and a plurality of air vents 21 are spaced apart on the hemispherical cover body.

[0033] After the central air guide cover 2 is fixed to the air inlet duct 1 , it is coaxially arranged with the air inlet duct 1 , and the drive motor 31 is fixed inside the central air guide cover 2 .

[0034] In this embodiment, 16 ventilation holes 21 are evenly arranged in the circumference of the hemispherical shell at the front of the central air guide cover 2 for cooling the drive motor 31 .

[0035] Optionally, the flame stabilizer includes an inner ring flame stabilizer 41 and an outer ring flame stabilizer 42 , and a plurality of fuel nozzles 44 are disposed on the inner ring flame stabilizer 41 and the outer ring flame stabilizer 42 .

[0036] In this embodiment, eight fuel nozzles 44 are evenly distributed on the inner ring flame stabilizer 41 , and sixteen fuel nozzles 44 are evenly distributed on the outer ring flame stabilizer 42 .

[0037] In this embodiment, both the inner ring flame stabilizer 41 and the outer ring flame stabilizer 42 are annular stabilizers with a V-shaped cross-section, and the radius of the inner ring flame stabilizer 41 is smaller than the radius of the outer ring flame stabilizer 42 .

[0038] Optionally, the combustion afterburner oil-electric hybrid ducted fan engine further includes a plurality of rectifying support plates 7, which are fixedly arranged on the combustion chamber barrel 45 along the circumferential direction of the central cone 43, and the inner ring flame stabilizer 41 and the outer ring flame stabilizer 42 are both fixedly connected to the plurality of rectifying support plates 7. The inner ring flame stabilizer 41 and the outer ring flame stabilizer 42 are concentrically arranged and concentric with the central cone 43, and the inner ring flame stabilizer 41 and the outer ring flame stabilizer 42 are fixed to the rear of the rectifying support plates 7.

[0039] Optionally, the tail nozzle 5 is a convergent nozzle, which forms a convergent channel together with the central cone 43 of the afterburner structure 4, the purpose of which is to ensure that the gas is continuously accelerated but does not exceed the speed of sound, thereby preventing excessive noise.

[0040] Optionally, the central cone 43 is a curved-wall cone, which has a better pressure diffusion effect than a straight-wall cone and can effectively suppress airflow separation on the wall.

[0041] Obviously, the embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A combustion afterburner oil-electric hybrid ducted fan engine, characterized in that: include: Air intake (1); A fan supercharging structure (3), the fan supercharging structure (3) comprising a battery, a drive motor (31), a housing (34) and a fan, the fan comprising a fan rotor (32) and a fan stator (33), the housing (34) being connected to the air inlet duct (1), the fan stator (33) being fixedly arranged on the housing (34), the fan rotor (32) being rotatably arranged on the fan stator (33), the fan rotor (32) and the fan stator (33) being coaxially arranged, the drive motor (31) being located in the air inlet duct (1), the drive motor (31) being able to drive the fan rotor (32) to rotate, and the battery being used to supply power to the drive motor (31); An afterburner structure (4), the afterburner structure (4) comprising a combustion chamber barrel (45), a central cone (43), a flame stabilizer and a fuel nozzle (44), the combustion chamber barrel (45) being connected to the outer shell (34), the large end of the central cone (43) being fixedly connected to the fan stator (33), the flame stabilizer being fixedly arranged in the combustion chamber barrel (45), the fan stator (33), the central cone (43) and the flame stabilizer being coaxially arranged, and the fuel nozzle (44) being arranged on the flame stabilizer; A tail nozzle (5), the combustion chamber barrel (45) is connected to the tail nozzle (5).

2. The combustion afterburner hybrid ducted fan engine according to claim 1, characterized in that: The invention also comprises a central air guide cover (2), wherein the central air guide cover (2) is fixedly arranged in the air inlet duct (1), the drive motor (31) is located in the central air guide cover (2), and the central air guide cover (2) has a hemispherical cover body at one end close to the air inlet end of the air inlet duct (1), and a plurality of ventilation holes (21) are arranged at intervals on the hemispherical cover body.

3. The combustion afterburner hybrid ducted fan engine according to claim 1, characterized in that: The flame stabilizer comprises an inner ring flame stabilizer (41) and an outer ring flame stabilizer (42), and a plurality of fuel nozzles (44) are arranged on the inner ring flame stabilizer (41) and the outer ring flame stabilizer (42).

4. The combustion afterburner hybrid ducted fan engine according to claim 3, characterized in that: The inner ring flame stabilizer (41) and the outer ring flame stabilizer (42) are both annular stabilizers with V-shaped cross-sections.

5. The combustion afterburner hybrid ducted fan engine according to claim 4, characterized in that: The radius of the inner ring flame stabilizer (41) is smaller than the radius of the outer ring flame stabilizer (42).

6. The combustion afterburner hybrid ducted fan engine according to claim 3, characterized in that: It also includes a plurality of rectifying support plates (7), which are fixedly arranged on the combustion chamber barrel (45) along the circumferential direction of the central cone (43), and the inner ring flame stabilizer (41) and the outer ring flame stabilizer (42) are both fixedly connected to the plurality of rectifying support plates (7).

7. The combustion afterburner hybrid ducted fan engine according to claim 1, characterized in that: The tail nozzle (5) is a convergent nozzle.

8. The combustion afterburner hybrid ducted fan engine according to claim 1, characterized in that: The central cone (43) is a curved-wall cone.

9. The combustion afterburner hybrid ducted fan engine according to claim 1, characterized in that: It also includes a supporting structure (6), and the fan stator (33) is fixed to the casing (34) through the supporting structure (6).

10. The combustion afterburner hybrid ducted fan engine according to claim 1, characterized in that: The driving motor (31) and the fan rotor (32) transmit power coaxially or through a transmission mechanism.

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