CN114132523A - Aircraft engine wake flow protection special equipment - Google Patents
Aircraft engine wake flow protection special equipment Download PDFInfo
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- CN114132523A CN114132523A CN202111205190.7A CN202111205190A CN114132523A CN 114132523 A CN114132523 A CN 114132523A CN 202111205190 A CN202111205190 A CN 202111205190A CN 114132523 A CN114132523 A CN 114132523A
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- 239000010935 stainless steel Substances 0.000 claims abstract description 103
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 103
- 238000009413 insulation Methods 0.000 claims abstract description 37
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 230000000712 assembly Effects 0.000 claims abstract description 8
- 238000000429 assembly Methods 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000010030 laminating Methods 0.000 abstract description 10
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 description 25
- 230000000694 effects Effects 0.000 description 22
- 230000004888 barrier function Effects 0.000 description 6
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000013011 mating Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F1/00—Ground or aircraft-carrier-deck installations
- B64F1/26—Ground or aircraft-carrier-deck installations for reducing engine or jet noise; Protecting airports from jet erosion
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention provides special equipment for protecting aircraft engine wake flow, which comprises a flow guide and noise reduction assembly; the diversion noise reduction assembly is provided with a stainless steel microporous plate, a sound insulation piece and a back sealing plate which are arranged in an arc shape from the windward side to the leeward side in sequence; the stainless steel microporous plate is laminated up and down in the connecting area of the two adjacent flow guide noise reduction assemblies; the laminated area is provided with a first through hole which is communicated through the micropores of the adjacent stainless steel microporous plates; a through groove formed by the micropores and the edges of the adjacent stainless steel microporous plates is formed in the laminated area; laminating stainless steel microporous plates up and down; forming the overlapped portion of the two micro holes into a first through hole having a diameter smaller than that of the micro hole; simultaneously forming a through groove between the micro-hole which is overlapped up and down and the edge of the adjacent stainless steel surrounding plate; the more channels are formed, so that the wake flow and the noise can better pass through the flow guide and noise reduction assembly; and shaping the channels to have smaller widths allows the wake and noise to pass through the flow directing and noise reducing assembly further dissipating the acoustic energy of the noise.
Description
Technical Field
The invention relates to the field of aviation equipment, in particular to special equipment for protecting aircraft engine wake flow.
Background
When civil aircraft ground is tested, a large amount of high-temperature and high-speed airflow can be generated at the tail of the aircraft, nearby workers or buildings can be impacted if the aircraft can not be tested in an open place, great potential safety hazards exist, noise generated when the aircraft is tested is not disturbing residents, and the aircraft ground is sound pollution.
The cavity resonance sound absorption structure is a certain cavity enclosed in the structure; and is communicated with the space through a small hole with a certain depth; the cavity resonance sound absorption structure is applied to the test of the ground of the airplane; the wake flow generated by the aircraft engine needs to penetrate through the small hole to enter the space and generate strong resonance with the small hole, so that the intense friction is generated, the sound energy is consumed, and the effect of reducing the noise is achieved.
In chinese patent No. 201510332465.1; the patent document with publication number 2017.10.10 discloses a noise reduction guide wall for an airplane ground test; the guide wall is arranged in a curve in the length direction and surrounds the outer side of the airflow emitted when the airplane is tested, the guide wall comprises a wall body which is anchored and connected to the ground foundation, the windward surface of the wall body is in an arc shape capable of guiding the airflow obliquely upwards to the air, the leeward surface of the wall body is anchored and connected with a support truss, and the bottom of the support truss is anchored and connected to the ground foundation; wherein, the wall body is sequentially provided with a stainless steel microporous plate, a sound absorption plate, a sound insulation plate, a cavity layer and a back sealing plate from the windward side to the leeward side.
But no hole is arranged at the upper and lower laminating positions of the connecting area of the two adjacent splicing units of the stainless steel microporous plate; and shown in the drawings hereof; the distance between the adjacent holes close to the upper and lower laminating positions is longer than that between the adjacent holes far away from the upper and lower laminating positions; thus, the sound absorption of the wake noise of the aircraft engine is uneven; meanwhile, a stainless steel microporous plate, a sound-absorbing material plate and a galvanized steel plate are sequentially arranged from the windward side to the leeward side to absorb noise; but is shown in connection with the drawings; no space exists between the stainless steel light microporous plate and the sound absorption plate; thus, the noise of the wake flow cannot generate vibration and sound absorption with the micropores; it can only pass through the micropores to act with the sound absorption plate and the sound insulation plate; thus, the sound absorption effect is poor; meanwhile, the perforation rate of the stainless steel microporous plate is 9% -10%; thus, the perforation rate is low; noise reduction can only be performed for noise reduction of close frequencies.
Disclosure of Invention
The invention provides special equipment for protecting aircraft engine wake; the sound absorption effect on the wake noise of the aircraft engine is uniform, and the noise is eliminated through the matching of the resonance sound absorption and the sound absorption piece; noise of different frequencies can be reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows: a special equipment for protecting aircraft engine wake; is arranged along the length direction in an arc shape; comprises a wall body and a bracket for supporting the wall body; the length direction of the wall body is formed by connecting more than two flow guide noise reduction assemblies, and the flow guide noise reduction assemblies are sequentially provided with an arc-shaped stainless steel microporous plate, a sound insulation piece and a back sealing plate from the windward side to the leeward side; the sound insulation piece comprises a first sound insulation strip, a second sound insulation strip, a third sound insulation strip and a fourth sound insulation strip; the first sound insulation strip and the second sound insulation strip are respectively arranged at one end of the back seal plate; the third sound insulation strip and the fourth sound insulation strip are respectively arranged on one side of the back sealing plate; the first sound insulation strip, the second sound insulation strip, the third sound insulation strip and the fourth sound insulation strip surround to form a cavity layer; the stainless steel microporous plate is laminated up and down in the connecting area of the two adjacent flow guide noise reduction assemblies; more than two groups of micropore groups are distributed on the stainless steel micropore plate along the length direction of the wall body; the distance between adjacent micro-hole groups is 13 mm; the micropore group comprises more than two micropores; the distance between every two adjacent micropores is 13 mm; the diameter of the micropores is 3-6 mm; the micropores are communicated with the cavity layer; coating a damping material on the inner surface of the stainless steel microporous plate; a sound absorbing piece is arranged in the cavity layer; a noise reduction space is arranged between the sound absorbing piece and the stainless steel microporous plate; the ratio of the thickness of the stainless steel microporous plate to the depth of the noise reduction space is 1: 150-200; the ratio of the thickness of the stainless steel microporous plate which is laminated up and down to the depth of the noise reduction space is 1: 75-100; the microwell comprises an inlet and an outlet; the inlet is arranged on the outer surface of the stainless steel microporous plate; the outlet is arranged on the inner surface of the stainless steel microporous plate; an arc-shaped guide structure is formed between the outlet and the inner surface of the stainless steel microporous plate; the size of the opening of the outlet is larger than the size of the opening of the inlet.
The laminated area is provided with a first through hole formed by the communication of the micropores of the adjacent stainless steel microporous plates; a through groove formed by the micropores and the edges of the adjacent stainless steel microporous plates is formed in the laminated area; the diameter of the first through hole is smaller than that of the micropore; the width of the through groove along the length direction of the wall body is smaller than the diameter of the micropore.
According to the arrangement, the stainless steel microporous plate, the sound insulation piece and the back sealing plate are sequentially arranged from the windward side to the leeward side; thus, the wake flow ejected by the airplane can be obliquely and upwards guided into the air; the wake flow with high-temperature heat is guided; the discharged wake flow does not influence residents or workers behind the airplane; micropores are arranged on the stainless steel microporous plate; by forming a cavity layer; and the cavity layer is communicated with the micropores; meanwhile, a sound absorbing piece is arranged in the cavity layer; a noise reduction space is arranged between the sound absorption piece and the stainless steel microporous plate; thus, a noise reduction space is formed between the sound absorbing piece and the stainless steel microporous plate; the wake flow passes through the micropores and enters the noise absorbing and reducing space; meanwhile, the noise in the wake flow and the micropores generate strong resonance to generate severe friction, so that sound energy is consumed; the rest noise which is not consumed acts on the sound absorbing piece; thus, the noise elimination effect is enhanced through the matching of the resonance sound absorption and the sound absorption piece. An arc-shaped guide structure is arranged at the outlet; this directs the wake passing through a micropore away from the micropore; thereby dispersing the accompanying noise in the wake flow and acting on the sound absorbing piece at different positions; further improving the noise elimination effect. Meanwhile, the depth of the noise reduction space is deep; the volume of the noise reduction space is large; the sound absorption effect on low-frequency noise is good. Meanwhile, the adjacent stainless steel microporous plates are laminated up and down; laminating the upper and lower parts of the adjacent stainless steel microporous plates; the ratio of the thickness of the two layers of stainless steel microporous plates to the depth of the noise reduction space is reduced; therefore, the sound absorption effect of the noise with higher frequency than the low-frequency noise at the overlapped position is good.
Laminating stainless steel microporous plates up and down; forming the overlapped portion of the two micro holes into a first through hole having a diameter smaller than that of the micro hole; simultaneously forming a through groove between the micropores overlapped up and down and the edge of the adjacent stainless steel micropore plate; because the two micropores are overlapped up and down and partially overlapped, a first through hole and two through grooves are formed; the diameter of the first through hole and the width of the through groove are both smaller than the diameter of the micropore; the more channels are formed in this way, so that the wake flow and noise can better pass through the flow guide and noise reduction assembly; and the smaller width channel is formed, so that the wake flow and the noise pass through the flow guide and noise reduction assembly to further consume the sound energy of the noise; the condition that the sound absorption effect is uneven due to the fact that no holes are formed in the laminated positions of the adjacent stainless steel micro-perforated plates is avoided. Simultaneously forming a first through hole and two through grooves; thus, the perforation rate of the adjacent stainless steel microporous plates at the upper and lower laminating positions is increased; enabling the first through hole and the through groove to resonate with noise with different frequencies accompanying in wake flow; by mating with the micro-holes; processing noises with different frequencies in the wake flow; the noise reduction effect is good. Through arranging the sound insulation strip; the noise after the partial sound energy is consumed enters the cavity layer; the sound insulating strips act on noise; so that the noise entering the noise cavity layer cannot be transmitted out of the cavity layer.
Further, the diameter of the so-called micropores was 5 mm.
Further, the support comprises an arc-shaped framework, a stand column and a support assembly; one end of the upright post is connected with the arc-shaped framework; the upright posts and the arc-shaped framework are obliquely arranged; along the length direction of the upright post; the distance between the upright post and the arc-shaped framework is gradually increased; the supporting component is connected between the upright post and the arc-shaped framework; the supporting component comprises a first supporting piece, a second supporting piece and a third supporting piece; a triangular structure is formed between the first support part and the second support part and between the second support part and the third support part; the flow guide noise reduction assembly is arranged on the arc-shaped framework; a fixed sealing cover is arranged on the flow guide noise reduction assembly and the arc-shaped framework; the fixed sealing cover comprises a first fixed plate, a second fixed plate and a third fixed plate; the first fixing plate is connected with one side of the second fixing plate; the third fixing plate is connected with the other side of the second fixing plate; the first fixing plate and the third fixing plate are both arranged vertically to the second fixing plate; the first fixing plate, the second fixing plate and the third fixing plate are provided with fixing cavities; the flow guide noise reduction assembly and one end of the arc-shaped framework are fixed in the fixed volume cavity; and the outer surface of the stainless steel microporous plate is attached to the inner surface of the first fixing piece.
The above setting is carried out; the arc-shaped framework is supported by the obliquely arranged upright posts; the support is stable; so that the arc-shaped framework can resist the impact of wake; the shaking caused by insufficient supporting force of the arc-shaped framework is avoided; thereby causing the situation of mutual interference with resonance to occur; simultaneously fixing the flow guide and noise reduction assembly and one end of the arc-shaped framework in a fixed volume cavity; and provides a fixing effect on the flow guiding and noise reducing group. Furthermore, the stainless steel microporous plate extends to a direction far away from the back sealing plate to form a horizontally arranged extension part; the extension part is arranged at the bottom end of the stainless steel microporous plate.
The arrangement is that the wake flow ejected by the airplane is guided by the extending part.
Furthermore, the width of the first through hole in the length direction of the wall body is smaller than that of the through groove.
Further, the ratio of the thickness of the stainless steel microporous plate to the depth of the noise reduction space is 1: 180; the ratio of the thickness of the stainless steel microporous plate laminated up and down to the depth of the noise reduction space is 1: 90.
Furthermore, the outer surface of the stainless steel microporous plate is provided with a zinc coating. Thus, the service life of the stainless steel microporous plate can be prolonged.
Further, the damping material is epoxy resin. Therefore, the damping loss of the vibration of the stainless steel microporous plate can be increased, and the sound absorption coefficient is improved.
Further, the ratio of the height of the stainless steel microporous plate to the arc length of the stainless steel microporous plate is as follows: 0.8:1.
Furthermore, a flow guide structure which is obliquely arranged is formed between the inlet and the outer surface of the stainless steel microporous plate.
The arrangement is that the flow guide structure is obliquely arranged; so that a part of wake flows obliquely enter the micropores under the action of the flow guide structure; causing a portion of the wake to change direction of flow; the wake flow can be guided to different positions of the noise reduction space; meanwhile, the device is matched with an arc-shaped guide structure; the effect of acting different positions of the wake flow and the guide sound-absorbing piece is improved; meanwhile, the length of the micropores is prolonged by arranging the flow guide structure; the resonance range of the micropores and noise is enlarged; the noise consumes much energy; and the noise reduction effect is improved.
Drawings
FIG. 1 is a top view of the present invention.
Fig. 2 is a schematic structural view of a flow guiding noise reduction unit connected to a bracket according to the present invention.
Fig. 3 is an enlarged view of a in fig. 2.
Fig. 4 is an enlarged view of c in fig. 2.
Fig. 5 is a schematic structural view of the fixing cover of the present invention.
Fig. 6 is a schematic structural diagram of a flow guiding and noise reducing set according to the present invention.
Fig. 7 is an enlarged view of d in fig. 6.
FIG. 8 is a schematic view of the structure of the stainless steel microplates laminated up and down.
Fig. 9 is an enlarged view of b in fig. 8.
FIG. 10 is a schematic view of the sound barrier and back closure plate of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-10; a special equipment for protecting aircraft engine wake; is arranged along the length direction in an arc shape; comprises a wall body 1 and a bracket 2 for supporting the wall body 1; the length direction of the wall body 1 is formed by connecting more than two flow guiding and noise reducing assemblies 3, and the flow guiding and noise reducing assemblies 3 are stainless steel microporous plates 31, sound insulation members 32 and back seal plates 33 which are arranged in an arc shape from the windward side to the leeward side in sequence; in this embodiment, the ratio of the height of the stainless steel microplate to the arc length of the stainless steel microplate is: 0.8:1.
The micro-pores 312 are in communication with the cavity layer 325; the inner surface of the stainless steel micropore plate 31 is coated with damping material; in this embodiment, the damping material is epoxy resin. Therefore, the damping loss of the vibration of the stainless steel microporous plate can be increased, and the sound absorption coefficient is improved. The sound absorbing piece 326 is arranged in the cavity layer 325; a noise reduction space is arranged between the sound absorbing member 326 and the stainless steel micro-porous plate 31. The wake flows pass through the micropores into the noise reduction space; and the wake and the micropore resonate strongly. In this embodiment, the sound absorbing member is a foam; the sound insulation member is a gypsum board. In the embodiment, the ratio of the thickness of the stainless steel microporous plate to the depth of the noise reduction space is 1: 180; the ratio of the thickness of the stainless steel microporous plate laminated up and down to the depth of the noise reduction space is 1: 90. The depth of the noise reduction space is deep; the volume of the noise reduction space is large; the sound absorption effect on low-frequency noise is good. Meanwhile, the adjacent stainless steel microporous plates are laminated up and down; laminating the upper and lower parts of the adjacent stainless steel microporous plates; the ratio of the thickness of the two layers of stainless steel microporous plates to the depth of the noise reduction space is reduced; therefore, the sound absorption effect of the noise with higher frequency than the low-frequency noise at the overlapped position is good.
The micro-pores 312 include an inlet 3121 and an outlet 3122; the inlet 3121 is arranged on the outer surface of the stainless steel micro-porous plate 21; the outlet 3122 is arranged on the inner surface of the stainless steel microporous plate 31; an arc-shaped guide structure 3123 is formed between the outlet 3122 and the inner surface of the stainless steel microporous plate 31; an obliquely arranged flow guide structure 3124 is formed between the inlet 3121 and the outer surface of the stainless steel microporous plate; the size of the opening of the outlet 3122 is larger than the size of the opening of the inlet 3121. As shown with reference to FIG. 7; the direction of the arrow is the flow direction of a part of wake flow; through the obliquely arranged flow guide structure; so that a part of wake flows obliquely enter the micropores under the action of the flow guide structure; causing a portion of the wake to change direction of flow; thereby guiding the wake flow to different positions of the noise reduction space. This allows the wake to enter the noise reduction space uniformly. Meanwhile, the length of the micropores is prolonged by arranging the flow guide structure; the resonance range of the micropores and noise is enlarged; the noise consumes much energy; and the noise reduction effect is improved.
The laminated area is provided with a first through hole 313 formed by the communication of micropores of adjacent stainless steel microporous plates; a through groove 314 formed by the micropores and the edge of the adjacent stainless steel microporous plate is formed in the laminated area; the diameter of the first through hole 313 is smaller than that of the micro hole; the width of the through groove 314 along the length direction of the wall body 1 is smaller than the diameter of the micropore. The width of the first through hole 313 along the length direction of the wall 1 is smaller than that of the through groove 314.
The stainless steel micro-porous plate 31 is provided with a horizontally arranged extension part 35 extending towards the direction far away from the back sealing plate 33; the extension 35 is disposed at the bottom end of the stainless steel microplate 31. The wake ejected by the aircraft is guided by the extension 35.
In this embodiment, the outer surface of the stainless steel microporous plate is provided with a zinc coating; thus the service life of the stainless steel microporous plate can be prolonged; the thickness of the cavity layer 325 is greater than the thickness of the stainless steel micro-porous plate 31, the thickness of the back cover plate 33 and the thickness of the sound absorbing member 326. Thus, a noise reduction space can be formed between the sound absorbing piece and the stainless steel microporous plate.
The support 2 comprises an arc-shaped framework 21, a stand column 22 and a support assembly; the flow guiding and noise reducing assembly is installed on the arc-shaped framework. One end of the upright post 22 is connected with the arc-shaped framework 21; the upright post 22 and the arc-shaped framework 21 are obliquely arranged; along the length of the column 22; the distance between the upright post 22 and the arc-shaped framework 21 is gradually increased; the supporting component is connected between the upright post 22 and the arc-shaped framework 21; the bottom end of the arc-shaped framework 21 is provided with a fixing piece 211; in use, the fixing member 211 and one end of the upright 22 are fixed to the ground. The supporting component comprises a first supporting piece 231, a second supporting piece 232 and a third supporting piece 233; a triangular structure is formed between the first support 231 and the second support 232, and between the second support 232 and the third support 233. Thus the support is stable.
A fixed sealing cover 24 is arranged on the flow guiding noise reduction assembly 3 and the arc-shaped framework 21; the fixing cover 24 includes a first fixing plate 241, a second fixing plate 242, and a third fixing plate 243; the first fixing plate 241 is connected to one side of the second fixing plate 242; the third fixing plate 243 is connected to the other side of the second fixing plate 252; the first fixing plate 241 and the third fixing plate 253 are both disposed perpendicular to the second fixing plate 242; the first, second, and third fixing plates 241, 242, and 243 are formed with fixing pockets 244; the diversion noise reduction assembly 3 and one end of the arc-shaped framework 21 are arranged in the fixed cavity 244 through bolts; and the outer surface of the stainless steel micro plate 31 is attached to the inner surface of the first holder 241. The arc-shaped framework is supported by the obliquely arranged upright posts; the support is stable; so that the arc-shaped framework can resist the impact of wake; the shaking caused by insufficient supporting force of the arc-shaped framework is avoided; thereby causing the situation of mutual interference with resonance to occur; simultaneously fixing the flow guide and noise reduction assembly and one end of the arc-shaped framework in a fixed volume cavity; and provides a fixing effect on the flow guiding and noise reducing group.
As shown with reference to FIG. 2; when the airplane sprays wake flow to the flow guiding noise reduction assembly; at least comprises the following two air flows; blowing the airflow A onto the outer surface of the stainless steel microporous plate; the gas flow A stainless steel microporous plate acts to form a gas flow A1 and a gas flow A2; the airflow B drives the airflow A1 and the airflow A2 to flow upwards along the cambered surface of the stainless steel microporous plate; the high-speed gas ejected by an engine during test run of the airplane is guided upwards; the airflow C enters the noise reduction space through the micropores; the airflow C and the micropores resonate to eliminate noise; and the sound energy that is not eliminated continues to react with the sound absorbing member. The sound insulation device comprises a stainless steel microporous plate, a sound insulation piece and a back sealing plate which are sequentially arranged from the windward side to the leeward side; thus, the wake flow ejected by the airplane can be obliquely and upwards guided into the air; the wake flow with high-temperature heat is guided; the discharged wake flow does not influence residents or workers behind the airplane; micropores are arranged on the stainless steel microporous plate; by forming a cavity layer; and the cavity layer is communicated with the micropores; meanwhile, a sound absorbing piece is arranged in the cavity layer; the wake flow passes through the micropores and enters a noise reduction space between the sound absorbing piece and the stainless steel microporous plate; meanwhile, the noise in the wake flow and the micropores generate strong resonance to generate severe friction, so that sound energy is consumed; the rest noise which is not consumed acts on the sound absorbing piece; thus, the noise elimination effect is enhanced through the matching of the resonance sound absorption and the sound absorption piece. An arc-shaped guide structure is arranged at the outlet; this directs the wake passing through a micropore away from the micropore; thereby dispersing the accompanying noise in the wake flow and acting on the sound absorbing piece at different positions; further improving the noise elimination effect. Meanwhile, the guide structure is matched with the arc-shaped guide structure; the effect of the wake and the effect of the different position actions of the guiding sound absorption piece are improved.
Laminating the stainless steel microporous plate 31 up and down; so that the overlapped portions of the two micro holes form the first through hole 313 having a diameter smaller than that of the micro hole; the micropores laminated up and down at the same time and the edges of the adjacent stainless steel micropore plates form a through groove 314; because the two micro holes are overlapped up and down and partially overlapped, a first through hole 313 and two through grooves 314 are formed; the diameter of the first through hole 313 and the width of the through groove 314 are both smaller than the diameter of the micro hole; the more channels are formed in this way, so that the wake flow and noise can better penetrate through the flow guiding and noise reducing assembly 3; and the smaller width channel is formed, so that the wake flow and noise pass through the flow guiding and noise reducing assembly 3, and the sound energy of the noise is further consumed; the phenomenon that the sound absorption effect is uneven due to the fact that no holes are formed in the laminated positions of the adjacent stainless steel micro-porous plates 31 is avoided. Simultaneously forming a first through hole and two through grooves; thus, the perforation rate of the adjacent stainless steel microporous plates at the upper and lower laminating positions is increased; enabling the first through hole and the through groove to resonate with noise with different frequencies accompanying in wake flow; by mating with the micro-holes; processing noises with different frequencies in the wake flow; the noise reduction effect is good. Through arranging the sound insulation strip; the noise after the partial acoustic energy is consumed enters the cavity layer 325; the sound insulating strips act on noise; so that noise entering the noise cavity layer 325 cannot be transmitted to the outside of the cavity layer 325.
Claims (10)
1. A special equipment for protecting aircraft engine wake; is arranged along the length direction in an arc shape; comprises a wall body and a bracket for supporting the wall body; the length direction of wall body is formed by the water conservancy diversion noise reduction subassembly connection more than two, its characterized in that: the flow guiding and noise reducing assembly is provided with a stainless steel microporous plate, a sound insulating piece and a back sealing plate which are arranged in an arc shape from the windward side to the leeward side in sequence; the sound insulation piece comprises a first sound insulation strip, a second sound insulation strip, a third sound insulation strip and a fourth sound insulation strip; the first sound insulation strip and the second sound insulation strip are respectively arranged at one end of the back seal plate; the third sound insulation strip and the fourth sound insulation strip are respectively arranged on one side of the back sealing plate; the first sound insulation strip, the second sound insulation strip, the third sound insulation strip and the fourth sound insulation strip surround to form a cavity layer; the stainless steel microporous plate is laminated up and down in the connecting area of the two adjacent flow guide noise reduction assemblies; more than two groups of micropore groups are distributed on the stainless steel micropore plate along the length direction of the wall body; the distance between adjacent micro-hole groups is 13 mm; the micropore group comprises more than two micropores; the distance between every two adjacent micropores is 13 mm; the diameter of the micropores is 3-6 mm; the micropores are communicated with the cavity layer; coating a damping material on the inner surface of the stainless steel microporous plate; a sound absorbing piece is arranged in the cavity layer; a noise reduction space is arranged between the sound absorbing piece and the stainless steel microporous plate; the ratio of the thickness of the stainless steel microporous plate to the depth of the noise reduction space is 1: 150-200; the ratio of the thickness of the stainless steel microporous plate which is laminated up and down to the depth of the noise reduction space is 1: 75-100; the microwell comprises an inlet and an outlet; the inlet is arranged on the outer surface of the stainless steel microporous plate; the outlet is arranged on the inner surface of the stainless steel microporous plate; an arc-shaped guide structure is formed between the outlet and the inner surface of the stainless steel microporous plate; the size of the opening of the outlet is larger than that of the opening of the inlet;
the laminated area is provided with a first through hole formed by the communication of the micropores of the adjacent stainless steel microporous plates; a through groove formed by the micropores and the edges of the adjacent stainless steel microporous plates is formed in the laminated area; the diameter of the first through hole is smaller than that of the micropore; the width of the through groove along the length direction of the wall body is smaller than the diameter of the micropore.
2. The aircraft engine wake protection specialty device of claim 1; the method is characterized in that: the diameter of the so-called micropores was 5 mm.
3. The aircraft engine wake protection specialty device of claim 1; the method is characterized in that: the support comprises an arc-shaped framework, an upright post and a support assembly; one end of the upright post is connected with the arc-shaped framework; the upright posts and the arc-shaped framework are obliquely arranged; along the length direction of the upright post; the distance between the upright post and the arc-shaped framework is gradually increased; the supporting component is connected between the upright post and the arc-shaped framework; the supporting component comprises a first supporting piece, a second supporting piece and a third supporting piece; a triangular structure is formed between the first support part and the second support part and between the second support part and the third support part; the flow guide noise reduction assembly is arranged on the arc-shaped framework; a fixed sealing cover is arranged on the flow guide noise reduction assembly and the arc-shaped framework; the fixed sealing cover comprises a first fixed plate, a second fixed plate and a third fixed plate; the first fixing plate is connected with one side of the second fixing plate; the third fixing plate is connected with the other side of the second fixing plate; the first fixing plate and the third fixing plate are both arranged vertically to the second fixing plate; the first fixing plate, the second fixing plate and the third fixing plate are provided with fixing cavities; the flow guide noise reduction assembly and one end of the arc-shaped framework are fixed in the fixed volume cavity; and the outer surface of the stainless steel microporous plate is attached to the inner surface of the first fixing piece.
4. The aircraft engine wake protection specialty device of claim 1; the method is characterized in that: the stainless steel microporous plate is provided with a horizontally arranged extension part extending towards the direction far away from the back sealing plate; the extension part is arranged at the bottom end of the stainless steel microporous plate.
5. The aircraft engine wake protection specialty device of claim 1; the method is characterized in that: the width of the first through hole along the length direction of the wall body is smaller than that of the through groove.
6. The aircraft engine wake protection specialty device of claim 1; the method is characterized in that: the ratio of the thickness of the stainless steel microporous plate to the depth of the noise reduction space is 1: 180; the ratio of the thickness of the stainless steel microporous plate laminated up and down to the depth of the noise reduction space is 1: 90.
7. The aircraft engine wake protection specialty device of claim 1; the method is characterized in that: the outer surface of the stainless steel microporous plate is provided with a zinc coating.
8. The aircraft engine wake protection specialty device of claim 1; the damping material is epoxy resin.
9. The aircraft engine wake protection specialty device of claim 1; the ratio of the height of the stainless steel microporous plate to the arc length of the stainless steel microporous plate is as follows: 0.8:1.
10. The aircraft engine wake protection specialty device of claim 1; an obliquely arranged flow guide structure is formed between the inlet and the outer surface of the stainless steel microporous plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111205190.7A CN114132523A (en) | 2021-10-15 | 2021-10-15 | Aircraft engine wake flow protection special equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111205190.7A CN114132523A (en) | 2021-10-15 | 2021-10-15 | Aircraft engine wake flow protection special equipment |
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| Publication Number | Publication Date |
|---|---|
| CN114132523A true CN114132523A (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111205190.7A Pending CN114132523A (en) | 2021-10-15 | 2021-10-15 | Aircraft engine wake flow protection special equipment |
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| CN (1) | CN114132523A (en) |
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| KR20190102904A (en) * | 2018-02-27 | 2019-09-04 | 성기인 | micro-perforated plate |
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2021
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| EP1736408A1 (en) * | 2005-06-25 | 2006-12-27 | APS Germany GmbH | Noise abatement facility for testing aircraft engines |
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| CN104890895A (en) * | 2015-06-16 | 2015-09-09 | 崔乃盛 | Noise reduction guide wall for ground tests of planes |
| KR20190102904A (en) * | 2018-02-27 | 2019-09-04 | 성기인 | micro-perforated plate |
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