CN116374182B - Sand control device and method thereof - Google Patents
Sand control device and method thereof Download PDFInfo
- Publication number
- CN116374182B CN116374182B CN202310158312.4A CN202310158312A CN116374182B CN 116374182 B CN116374182 B CN 116374182B CN 202310158312 A CN202310158312 A CN 202310158312A CN 116374182 B CN116374182 B CN 116374182B
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- Prior art keywords
- pipe
- sand
- tube
- control device
- dust
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- 239000004576 sand Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000002265 prevention Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
- F02C7/055—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with intake grids, screens or guards
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
- B64D33/02—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes
- B64D2033/022—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of combustion air intakes comprising bird or foreign object protections
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cyclones (AREA)
- Crushing And Pulverization Processes (AREA)
Abstract
The invention relates to a sand control device and a method thereof, wherein the device comprises a panel assembly with a cavity and a plurality of centrifugal mechanisms arranged on the panel assembly, the distal end of a pipe assembly is arranged on the panel assembly, the pipe assembly comprises a first pipe and a plurality of second pipes connected with the distal end of the first pipe, each second pipe is provided with a plurality of nozzles, and a sand discharge pipe is arranged on the panel assembly near each nozzle; according to the invention, the third pipe and the fourth pipe are arranged, the vortex blade is arranged in the third pipe, and meanwhile, the inner diameter of the fourth pipe is smaller than that of the third pipe, so that a gap is formed between the fourth pipe and the third pipe, dust-containing air is thrown to the pipe wall under the influence of inertial centrifugal force after entering the vortex blade, and enters the gap between the third pipe and the fourth pipe, so that the dust-containing air is separated into clean air and dust-containing sand particles.
Description
Technical Field
The invention relates to the field of air inlet equipment of helicopter engines, in particular to a sand control device and a sand control method.
Background
At present, when a helicopter flies at low altitude, hovers or takes off and land, sand and dust raised by rotor downward washing flow are sucked into an engine along with airflow, so that various important parts and blades in an air inlet channel of the engine are easily worn, and therefore, a sand control device is urgently required to be additionally arranged in the helicopter to prolong the service life of the engine.
The sand control device is blank in China, mainly depends on import, after the engine is started, air and sand dust are sucked into the engine together, and the sand dust can polish engine blades, so that the service life of the engine is reduced.
Disclosure of Invention
In view of the above-described shortcomings of the prior art, it is an object of the present invention to provide a sand control device and method thereof that address one or more of the problems of the prior art.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the sand control device comprises a panel assembly with a cavity and a plurality of centrifugal mechanisms arranged in the panel assembly, wherein the distal end of a pipe assembly is arranged in the panel assembly, the pipe assembly comprises a first pipe and a plurality of second pipes connected with the distal end of the first pipe, each second pipe is provided with a plurality of nozzles, and a sand discharge pipe is further arranged on the panel assembly near each nozzle; the gas and the sand dust are split by the pipe assembly, and the centrifugal assembly separates the sand dust in the atmosphere and is ejected by the split gas through the nozzle and the sand discharge pipe so as to realize the discharge of the sand dust from the sand discharge pipe.
Further, the centrifugal mechanism includes a third tube having a portion nested within a fourth tube.
Further, a gap is formed between the part of the third pipe sleeved in the fourth pipe and the outer side of the fourth pipe.
Further, the length of the third pipe sleeved into the fourth pipe accounts for 1/3-2/3 of the total length of the third pipe.
Further, the third pipe comprises a third pipe body, the shaft is arranged in the third pipe body, and a vortex blade is further connected between the outer side of the shaft and the third pipe body along the axial direction of the shaft.
Further, the fourth pipe comprises a fourth pipe body, the inner diameter of the fourth pipe body is smaller than the inner diameter of the third pipe body, a first orifice is formed in the position, close to the third pipe, of the fourth pipe body, a second orifice is formed in the position, far away from the third pipe, of the fourth pipe body, and the aperture of the first orifice is smaller than the aperture of the second orifice.
Further, a first protruding portion is further disposed on the outer side of the fourth pipe body, near the covering portion of the third pipe.
Further, a second protruding portion is provided on the outer side of the fourth pipe, away from the covering portion of the third pipe.
Further, the caliber of the orifice of the sand discharge pipe close to the nozzle is smaller than that of the orifice of the sand discharge pipe far away from the nozzle.
Correspondingly, the invention also provides a method for the sand control device, which comprises the following steps:
the engine provides gas to flow into the first pipe and split through the second pipe;
dust-containing air enters the sand prevention device and clean air and sand are separated through a centrifugal mechanism;
the split gas enters a nozzle, is ejected through a sand discharge pipe, and enables sand and dust mixed in the cavity to be discharged from the sand discharge pipe;
clean air flows into the engine through the intake duct.
Compared with the prior art, the invention has the following beneficial technical effects that
According to the invention, the third pipe and the fourth pipe are arranged, the vortex blade is arranged in the third pipe, and meanwhile, the inner diameter of the fourth pipe is smaller than that of the third pipe, so that a gap is formed between the fourth pipe and the third pipe, dust-containing air is thrown to the pipe wall under the influence of inertial centrifugal force after entering the vortex blade, and then enters the gap between the third pipe and the fourth pipe, so that the dust-containing air is separated into clean air and dust-containing sand particles.
Further, through setting up nozzle and sand discharge pipe, can realize ejecting the air that contains dirt sand particle and discharge to the horn mouth design of sand discharge pipe can reduce the resistance that the air flowed, improves and draws the effect.
Further, by setting the ratio of the wheel to the shell, the separation efficiency of the third pipe is improved, and excessive pressure loss is avoided.
Drawings
FIG. 1 illustrates an isometric view of a sand control device and a method thereof according to an embodiment of the present invention.
FIG. 2 illustrates an isometric view of a centrifugal mechanism in a sand control device and method of an embodiment of the present invention.
FIG. 3 illustrates a front view of a centrifugal mechanism in a sand control device and method of an embodiment of the present invention.
FIG. 4 illustrates a side view of a sand control device and a centrifugal mechanism in a method thereof according to an embodiment of the present invention.
FIG. 5 shows a cross-sectional view of a centrifugal mechanism in the direction A-A of a sand control device and method according to an embodiment of the present invention.
FIG. 6 is a schematic view showing a partial structure of a sand control device and a method thereof according to an embodiment of the present invention.
The reference numerals in the drawings: 1. a first panel; 2. a second panel; 3. a side plate; 400. a first tube; 401. a second tube; 402. a nozzle; 5. a centrifugal mechanism; 500. a third tube; 5000. a third tube body; 5001. a shaft; 5002. a swirl vane; 501. a fourth pipe; 5010. a fourth pipe body; 5011. a first projection; 5012. a second projection; 5013. a first orifice; 5014. a second orifice; 6. a sand discharge pipe; 600. an orifice; 601. a flange portion; 602. a sand discharge pipe body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the sand control device and the method thereof according to the present invention will be described in further detail with reference to the accompanying drawings and detailed description. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the invention. For a better understanding of the invention with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that any modifications, changes in the proportions, or adjustments of the sizes of structures, proportions, or otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or essential characteristics thereof.
Referring to fig. 1 and 6, the sand control device according to the present embodiment includes a panel assembly having a chamber and a plurality of centrifugal mechanisms 5 disposed on the panel assembly, wherein a distal end of the tube assembly is disposed in the panel assembly, the tube assembly includes a first tube 400 and a plurality of second tubes 401 connected to the distal end of the first tube 400, in this embodiment, each of the second tubes 401 is disposed symmetrically with respect to the first tube 400, each of the second tubes 401 has a plurality of nozzles 402, a sand discharge tube 6 is disposed on the panel assembly near each of the nozzles 402, the nozzles 402 and the sand discharge tube 6 together form an injection assembly, the gas provided by the engine is split by the tube assembly, and the centrifugal assembly injects the sand and dust in the gas through the split gas through the injection assembly, so as to realize sand and dust discharge.
With continued reference to fig. 1, the panel assembly includes a first panel 1 and a second panel 2, a space is provided between the first panel 1 and the second panel 2, and side plates 3 are circumferentially enclosed and disposed between the first panel 1 and the second panel 2, so that a cavity of the panel assembly is formed in the enclosed space of the first panel 1, the second panel 2 and each side plate 3.
With continued reference to fig. 1 and 2, the centrifugal mechanism 5 includes a third tube 500 and a fourth tube 501, and the third tube 500 has a portion that is nested into the fourth tube 501. Specifically, the third tube 500 is fixed to the first panel 1, and the fourth tube 501 is fixed to the second panel 2.
Further, referring to fig. 2, 3, 4 and 5, a gap is formed between a portion of the third pipe 500 covering the fourth pipe 501 and the outer side of the fourth pipe 501, and the gap is used for flowing sand, wherein the length of the third pipe 500 covering the fourth pipe 501 is 1/3-2/3 of the total length of the third pipe 500, and the covering length can enable the sand to flow rapidly in a short time, so as to further improve the sand flowing rate.
Further, as shown in fig. 2, 3, 4 and 5, the third tube 500 includes a third tube body 5000, a shaft 5001 is disposed in the third tube body 5000, the shaft 5001 and the third tube body 5000 are coaxially disposed, and a swirl vane 5002 is further connected between the outside of the shaft 5001 and the third tube body 5000 along the axial direction of the shaft 5001. The gas in the dust-containing air is introduced through the swirl blades 5002, the gas forms a swirling airflow by virtue of the swirl blades 5002, and the swirling airflow is formed while rotating the dust and sand to be centrifuged and approach the inner wall of the third pipe body 5000, and is influenced by the centrifugal force and thrown out through a gap between a portion of the third pipe 500 covering the fourth pipe 501 and the outer side of the fourth pipe 501 and into a chamber of the panel assembly.
Further, referring to fig. 5, the ratio H/D1 of the wheel shell of the third tube 500 is less than 0.3, where H represents the diameter of the shaft 5001, and D1 represents the diameter of the third tube body 5000, and the separation efficiency of the third tube 500 can be improved by setting the ratio of the wheel shell, so as to avoid excessive pressure loss.
Further, please continue to refer to fig. 2, 3, 4 and 5, the fourth pipe 501 includes a fourth pipe body 5010, the fourth pipe body 5010 has an inner diameter smaller than that of the third pipe body 5000, the fourth pipe body 5010 has a through hole, the fourth pipe body 5010 has a first hole 5013 near the third pipe 500, the fourth pipe body 5010 has a second hole 5014 far from the third pipe 500, and the first hole 5013 has a hole diameter smaller than that of the second hole 5014. Because the aperture of the first orifice 5013 is smaller than that of the second orifice 5014, the fourth pipe body 5010 forms a conical pipe, and the design of the conical pipe makes the clean air flow to the fourth pipe 501 while diffusing, thereby realizing the rapid flow of the clean air.
Further, referring to fig. 2, 3, 4 and 5, a first protrusion 5011 is further disposed on the outer side of the fourth pipe body 5010 near the covering portion of the third pipe 500. The first protruding part 5011 is provided to reduce the gap between the third pipe 500 and the fourth pipe 501, thereby enhancing the gas-solid two-phase flow, and the first protruding part 5011 has a slope that allows the sand to flow out but is not reversible. A second protrusion 5012 is also provided on the outer side of the fourth pipe 501, away from the covered portion of the third pipe 500. Specifically, the second protruding portion 5012 has a limiting function, and when the fourth pipe 501 is connected to the second panel 2, the second protruding portion 5012 is fixed to the second panel 2 by means of heat fusion, so as to realize stable assembly of the positioning assembly.
Further, referring to fig. 6, the sand discharge pipe 6 includes a sand discharge pipe body 602, and the sand discharge pipe body 602 has a flange 601 near the nozzle 402, and is fixedly connected to the side plate 3 through the flange 601. The flange 601 is provided with an orifice 600 which can be communicated with the inside of the sand discharge pipe body 602, the orifice caliber of the sand discharge pipe 6 close to the nozzle 402 is smaller than the orifice caliber of the sand discharge pipe 6 far away from the nozzle 402, so that the sand discharge pipe 6 also forms a bell mouth at the sand outlet, the bell mouth can enable the injection effect of air to be better, and the resistance of air flow is reduced.
Correspondingly, the invention also provides a method for the sand control device, which comprises the following steps:
step one: referring to fig. 1 and 6, the engine provides gas to the sand control device, which flows in from the first pipe 400 and is split through the second pipe 401.
Step two: the dust-laden air of the outdoor environment enters the sand control device and enters the centrifugal mechanism 5, the dust-laden air firstly enters the third pipe 500 and forms vortex airflow, most dust sand particles are thrown towards the pipe wall of the third pipe 500 under the action of inertial centrifugal force, a small amount of air is communicated with a gap between the third pipe 500 and the fourth pipe 501 and enters the cavity of the panel assembly, and clean air flows to the engine from the central fourth pipe 501.
Step three: the branched gas enters the second pipe 401, is branched, and is ejected from each nozzle 402, and the air mixed with the sand dust in the chamber is ejected from the sand discharge pipe 6.
Step four: clean air flows out of the fourth pipe 501 and flows into the engine through the air inlet channel, and as the clean air contains a small amount of sand dust, the sand dust can be reduced to polish the engine blade, and the service life of the engine blade is prolonged. The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (6)
1. Sand control device, its characterized in that: the device comprises a panel assembly with a cavity and a plurality of centrifugal mechanisms arranged in the panel assembly, wherein the distal end of a pipe assembly is arranged in the panel assembly, the pipe assembly comprises a first pipe and a plurality of second pipes connected with the distal end of the first pipe, each second pipe is provided with a plurality of nozzles, and a sand discharge pipe is arranged on the panel assembly near each nozzle; the gas and the sand dust are split by the pipe assembly, and the centrifugal assembly separates the sand dust in the atmosphere and is ejected by the split gas through the nozzle and the sand discharge pipe so as to realize the discharge of the sand dust from the sand discharge pipe; the centrifugal mechanism comprises a third tube and a fourth tube, wherein the third tube is provided with a part sleeved into the fourth tube; a first protruding part is arranged on the outer side of the fourth pipe body and is close to the covering part of the third pipe, and the first protruding part is provided with a slope; a second protruding part is arranged at the outer side of the fourth pipe far away from the covering part of the third pipe; the third tube is sleeved with a gap between the part of the fourth tube and the outer side of the fourth tube.
2. The sand control device of claim 1 wherein: the length of the third pipe sleeved into the fourth pipe accounts for 1/3-2/3 of the total length of the third pipe.
3. The sand control device of claim 2 wherein: the third pipe comprises a third pipe body, a shaft is arranged in the third pipe body, and vortex blades are further connected between the outer side of the shaft and the third pipe body along the axial direction of the shaft.
4. The sand control device of claim 2 wherein: the fourth pipe comprises a fourth pipe body, the inner diameter of the fourth pipe body is smaller than that of the third pipe body, a first orifice is formed in the position, close to the third pipe, of the fourth pipe body, a second orifice is formed in the position, far away from the third pipe, of the fourth pipe body, and the aperture of the first orifice is smaller than that of the second orifice.
5. The sand control device of claim 1 wherein: the caliber of the orifice of the sand discharge pipe close to the nozzle is smaller than that of the orifice of the sand discharge pipe far away from the nozzle.
6. The method of using a sand control device as defined in any one of claims 1-5 comprising the steps of:
the engine provides gas to flow into the first pipe and split through the second pipe;
dust-containing air enters the sand prevention device and clean air and sand are separated through a centrifugal mechanism; the split gas enters a nozzle and is ejected through a sand discharge pipe, so that sand and dust mixed in the cavity are discharged from the sand discharge pipe;
clean air flows into the engine through the intake duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310158312.4A CN116374182B (en) | 2023-02-23 | 2023-02-23 | Sand control device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310158312.4A CN116374182B (en) | 2023-02-23 | 2023-02-23 | Sand control device and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116374182A CN116374182A (en) | 2023-07-04 |
| CN116374182B true CN116374182B (en) | 2024-04-02 |
Family
ID=86968322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310158312.4A Active CN116374182B (en) | 2023-02-23 | 2023-02-23 | Sand control device and method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116374182B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821615A (en) * | 2012-11-16 | 2014-05-28 | 哈尔滨飞机工业集团有限责任公司 | Engine gas inlet protection device |
| CN210599227U (en) * | 2019-09-30 | 2020-05-22 | 天津天陆嘉航科技有限公司 | Engine air intake system with sand control device |
| CN213807865U (en) * | 2020-12-14 | 2021-07-27 | 天津天陆嘉航科技有限公司 | Air inlet purification device and helicopter |
| CN115489741A (en) * | 2022-09-26 | 2022-12-20 | 西安交通大学 | Air inlet energy-saving sand discharging device of helicopter engine based on vortex tube separator |
| CN115489740A (en) * | 2022-09-26 | 2022-12-20 | 西安交通大学 | Helicopter engine air inlet sand discharging device with abrasion-proof axial flow fan blades |
-
2023
- 2023-02-23 CN CN202310158312.4A patent/CN116374182B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821615A (en) * | 2012-11-16 | 2014-05-28 | 哈尔滨飞机工业集团有限责任公司 | Engine gas inlet protection device |
| CN210599227U (en) * | 2019-09-30 | 2020-05-22 | 天津天陆嘉航科技有限公司 | Engine air intake system with sand control device |
| CN213807865U (en) * | 2020-12-14 | 2021-07-27 | 天津天陆嘉航科技有限公司 | Air inlet purification device and helicopter |
| CN115489741A (en) * | 2022-09-26 | 2022-12-20 | 西安交通大学 | Air inlet energy-saving sand discharging device of helicopter engine based on vortex tube separator |
| CN115489740A (en) * | 2022-09-26 | 2022-12-20 | 西安交通大学 | Helicopter engine air inlet sand discharging device with abrasion-proof axial flow fan blades |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116374182A (en) | 2023-07-04 |
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