Stationary blade structure of precooling engine

Abstract

A pre-cooling engine stationary blade structure comprises a stator blade, a casing, a guide pipe, a cooling medium input pipe and a gas collecting pipe. The casing is cylindrical, one end of each stator blade is fixedly connected with the inner wall of the casing, the other end of each stator blade is suspended, and the plane where each stator blade is located is parallel to the axial direction of the casing. The stator blades are evenly distributed on the inner wall of the casing in the radial direction. The cooling medium input pipe and the gas collecting pipe surround the outer wall of the casing in the circumferential direction; each stator blade is provided with a rotary type pre-cooling channel, one end of each rotary type pre-cooling channel is a starting end, and the other end of each rotary type pre-cooling channel is a discharging end. Each starting end is communicated with a cooling medium input pipe through a guide pipe, and a cooling medium in the cooling medium input pipe is guided into the rotary pre-cooling channel; and each discharge end is communicated with the gas collecting pipe through a guide pipe, and the cooling medium subjected to heat exchange in the rotary pre-cooling channel is guided out to the gas collecting pipe. The air inlet temperature of the engine is reduced, and meanwhile the structure of the pre-cooling engine is greatly simplified.

Description

Technical Field

[0001] This invention relates to a pre-cooled engine stator structure, belonging to the field of engine assembly. Background Technology

[0002] With technological advancements, aerospace vehicles are a crucial future development area, and the propulsion system is the heart of these vehicles. Due to the wide Mach number range required for aerospace vehicle operation, various combined-engine configurations have emerged to meet operational demands. Among these, the combined propulsion system, which integrates a mature engine with multiple pre-cooling structures, offers relatively good engineering feasibility. This system primarily utilizes heat exchangers and liquid metal heat exchange media on the engine for heat transfer. However, this approach leads to a complex pre-cooling system and increases engine weight. Summary of the Invention

[0003] The technical problem solved by the present invention is to overcome the shortcomings of the prior art and provide a pre-cooled engine stator blade structure, so that the engine stator blade structure can reduce the engine intake air temperature and simplify the complexity of the structure.

[0004] The technical solution of the present invention is: a pre-cooled engine stator structure, comprising: stator blades, casing, duct, cooling medium inlet pipe, and gas collection pipe;

[0005] The casing is cylindrical, with one end of each stator blade fixed to the inner wall of the casing and the other end suspended; multiple stator blades are evenly distributed radially along the inner wall of the casing.

[0006] The cooling medium inlet pipe is circumferentially wrapped around the outer wall of the casing at certain intervals; one end of the cooling medium inlet pipe is closed and the other end is connected to the cooling medium reservoir.

[0007] The gas collection pipe is circumferentially encircled by the outer wall of the casing at certain intervals; one end of the gas collection pipe is closed and the other end is connected to the afterburner.

[0008] Each stator blade is equipped with a cyclone precooling channel. One end of each cyclone precooling channel is the starting end, and the other end is the discharge end. Each starting end is connected to the cooling medium input pipe through a conduit, which introduces the cooling medium in the cooling medium input pipe into the cyclone precooling channel. Each discharge end is connected to the gas collection pipe through a conduit, which discharges the cooling medium after heat exchange in the cyclone precooling channel to the gas collection pipe.

[0009] Preferably, the number of still leaf blades ranges from 21 to 29, and is an odd number.

[0010] Preferably, the rotary precooling channel is a flow channel machined on the surface of the stator blade, and its diameter D is 5% to 15% of the maximum thickness of the stator blade. The spacing between adjacent straight flow channels in the rotary precooling channel is 2D to 4D.

[0011] Preferably, the length of the straight section of the rotary precooling channel is at least three-fifths of the length from the root to the tip of the stator blade, and the distance between the outer envelope of the rotary precooling channel and the leading and trailing edges of the stator blade is at least 3D to 4D; where D is the diameter of the rotary precooling channel.

[0012] Preferably, the distance between the cooling medium inlet pipe and the outer wall of the casing is 5mm to 8mm;

[0013] The distance between the gas collection pipe and the outer wall of the casing is 5mm to 8mm.

[0014] Preferably, the gas collection pipe is connected to the afterburner to perform secondary combustion of the gas after it has passed through the cyclone precooling channel.

[0015] Preferably, the casing and stator blades are integrally formed, the cooling medium input pipe and conduit are integrally formed, and the gas collection pipe and conduit are integrally formed.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The pre-cooled engine of the present invention adopts a structure combining compressor stator blades, casing, cooling medium inlet pipe and gas collection pipe to reduce engine intake temperature and improve engine space utilization. Attached Figure Description

[0018] Figure 1 Here is a schematic diagram of the overall structure of the stator blade of the precooled engine of the present invention: (a) is a structural diagram of the stator blade of the precooled engine, and (b) is a side view of the stator blade of the precooled engine.

[0019] Figure 2 This is a schematic diagram of the internal structure of the stator blades of the pre-cooled engine of the present invention.

[0020] Attached image labels:

[0021] 1. Stator blades; 2. Casing; 3. Conduit; 4. Cooling medium inlet pipe; 5. Gas collection pipe; 6. Starting end; 7. Rotary precooling channel; 8. Drain end Detailed Implementation

[0022] The technical solution of this invention patent is: a pre-cooled engine stator blade structure, which can reduce the engine intake air temperature and improve the engine space utilization rate. It includes compressor stator blades 1, a casing 2, a duct 3, a cooling medium inlet pipe 4, and a gas collection pipe 5. Wherein:

[0023] The casing 2 is cylindrical, and the number of stator blades 1 ranges from 20 to 30. Each stator blade 1 is fixed to the inner wall of the casing 2 at one end and suspended at the other end. Multiple stator blades 1 are evenly distributed radially on the inner wall of the casing 2. When each stator blade 1 is a planar blade, the plane it is located on can be parallel to the axial direction of the casing 2.

[0024] Cooling medium inlet pipe 4 is circumferentially wrapped around the outer wall of casing 2 at certain intervals; cooling medium inlet pipe 4 is connected to cooling medium reservoir.

[0025] Gas collection pipe 5 is circumferentially encircled by the outer wall of casing 2 at certain intervals; gas collection pipe 5 is connected to afterburner chamber.

[0026] Each stator blade 1 is equipped with a closed rotary precooling channel 7. One end of the rotary precooling channel 7 is the starting end, and the other end is the discharge end. Each starting end is connected to the cooling medium input pipe 4 through the conduit 3, so that the cooling medium in the cooling medium input pipe 4 is introduced into the rotary precooling channel 7. Each discharge end is connected to the gas collection pipe 5 through the conduit 3, so that the cooling medium after heat exchange in the rotary precooling channel 7 is discharged to the gas collection pipe 5.

[0027] The number of stator blades ranges from 20 to 30. To avoid resonance between adjacent components, the number of blades is generally odd.

[0028] Rotary precooling channel 7 is a rotary closed channel machined on the stator blade. Its structure consists of a cooling channel with a diameter D of 5% to 15% of the maximum thickness of the blade profile machined inside the blade, and the hole spacing (the distance between adjacent straight sections of the channel) is 2D to 4D.

[0029] The rotary precooling channel 7 is machined on the surface of the stator blade, and the three-dimensional shape of its outer envelope is consistent with the blade shape of the corresponding area of ​​the blade. The length of each straight section of the rotary precooling channel 7 is at least three-fifths of the length from the blade root to the blade tip on the stator blade, and the distance between the outer envelope of the rotary precooling channel 7 and the leading and trailing edges of the stator blade is at least 3D to 4D. The leading edge refers to the end of the stator blade facing the airflow, which is the part of the blade that first contacts the airflow; the trailing edge refers to the end of the stator blade facing away from the airflow, which is the part of the blade where the airflow leaves the blade.

[0030] The distance between the cooling medium inlet pipe 4 and the outer wall of the casing 2 is 5-8 mm;

[0031] The distance between the gas collection pipe 5 and the outer wall of the casing 2 is 5-8 mm.

[0032] Gas collection pipe 5 is connected to the afterburner to perform secondary combustion of the gas after heat exchange.

[0033] The casing and the stator blades are integrally molded. The cooling medium inlet pipe 4, the gas collection pipe 5, and the conduit 3 are integrally molded.

[0034] In the stator blade structure of the pre-cooled engine described above: the stator blade and the casing are integrally machined.

[0035] In the stator blade structure of the pre-cooled engine described above: each stator blade 1 has a continuous rotary pre-cooling channel in the middle, with the two ends referred to as the starting end 6 and the discharge end 8, respectively.

[0036] In the above-mentioned stator blade structure of a pre-cooled engine: the starting end 6 on each stator blade is connected to the cooling medium input pipe 4 through the conduit 3.

[0037] In the stator blade structure of the pre-cooled engine described above: the vent end 8 on each stator blade is connected to the gas collection pipe 5 through the conduit 3.

[0038] like Figure 1 As shown, the cooling medium inlet pipe 4 is connected to the starting end of the rotational precooling channel inside the stator blade via the conduit 3. The gas collection pipe 5 is connected to the outlet end of the rotational precooling channel inside the stator blade via the conduit 3.

[0039] like Figure 2 As shown, the cooling medium enters the closed rotary precooling channel 7 from the starting end 6 and exchanges heat with the air passing through the stator blades. After heat exchange, the medium is discharged from the blade channel through the discharge end 8 and enters the gas collection pipe 5.

[0040] like Figure 1 As shown, the cooling medium storage tank is connected to the cooling medium input pipe 4 through valves and pipelines; the cooling medium input pipe 4 is connected to the rotary precooling channel 7 through conduit 3; the gas collection pipe 5 introduces the heat-exchanged medium (gas hydrogen) into the afterburner for secondary combustion through valves and pipelines.

[0041] Before starting, helium is introduced into the pre-cooling channel 7 of the stator blades through the cooling medium inlet pipe 4 to purge the air from the pipe. Then, cooling medium is introduced into the channel to pre-cool the compressor guide vanes. After the engine starts, air flows through the compressor stator blades for heat exchange. The cooled air is then pressurized by the compressor and enters the combustion chamber for combustion. The heat-exchanged medium enters the gas collection pipe 5 through the conduit 3 and finally enters the afterburner for secondary combustion, increasing engine thrust.

[0042] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A pre-cooled engine stator structure, characterized in that... include: Stator blades (1), casing (2), duct (3), cooling medium inlet pipe (4), gas collection pipe (5); The casing (2) is cylindrical, and one end of each stator blade (1) is fixed to the inner wall of the casing (2), while the other end is suspended. Multiple stator blades (1) are evenly distributed radially along the inner wall of the casing (2). The cooling medium inlet pipe (4) is circumferentially wrapped around the outer wall of the casing (2) at certain intervals; one end of the cooling medium inlet pipe (4) is closed and the other end is connected to the cooling medium reservoir; Gas collection pipe (5) is circumferentially wrapped around the outer wall of the casing (2) at certain intervals; one end of the gas collection pipe is closed and the other end is connected to the afterburner. Each stator blade (1) is provided with a rotary precooling channel (7), one end of each rotary precooling channel (7) is the starting end and the other end is the discharge end; each starting end is connected to the cooling medium input pipe (4) through the conduit (3) to introduce the cooling medium in the cooling medium input pipe (4) into the rotary precooling channel (7); each discharge end is connected to the gas collection pipe (5) through the conduit (3) to discharge the cooling medium after heat exchange in the rotary precooling channel (7) to the gas collection pipe (5).

2. The pre-cooled engine stator structure according to claim 1, characterized in that: The number of leaves (1) of the quiescent spores ranges from 21 to 29, and is an odd number.

3. The pre-cooled engine stator structure according to claim 1, characterized in that: The rotary precooling channel (7) is a flow channel machined on the surface of the stator blade (1). Its diameter D is 5% to 15% of the maximum thickness of the stator blade. The spacing between adjacent straight flow channels in the rotary precooling channel (7) is 2D to 4D.

4. The pre-cooled engine stator structure according to claim 1, characterized in that: The length of the straight section of the rotary precooling channel (7) is at least three-fifths of the length from the leaf root to the leaf tip on the stator blade, and the distance between the outer envelope of the rotary precooling channel (7) and the leading and trailing edges of the stator blade is at least 3D to 4D; D is the diameter of the flow channel of the rotary precooling channel (7).

5. A pre-cooled engine stator structure according to claim 1, characterized in that: The distance between the cooling medium inlet pipe (4) and the outer wall of the casing (2) is 5mm to 8mm; The distance between the gas collection pipe (5) and the outer wall of the casing (2) is 5mm to 8mm.

6. The pre-cooled engine stator structure according to claim 1, characterized in that: The gas collection pipe (5) is connected to the afterburner to perform secondary combustion of the gas after it has passed through the cyclone precooling channel (7) for heat exchange.

7. A pre-cooled engine stator structure according to claim 1, characterized in that: The casing (2) and stator blade (1) are integrally formed, the cooling medium input pipe (4) and the conduit (3) are integrally formed, and the gas collection pipe (5) and the conduit (3) are integrally formed.

Images