CN117928881A - Wind tunnel modularized shrink section system - Google Patents
Wind tunnel modularized shrink section system Download PDFInfo
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- CN117928881A CN117928881A CN202410335658.1A CN202410335658A CN117928881A CN 117928881 A CN117928881 A CN 117928881A CN 202410335658 A CN202410335658 A CN 202410335658A CN 117928881 A CN117928881 A CN 117928881A
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- 230000007246 mechanism Effects 0.000 claims abstract description 126
- 230000008602 contraction Effects 0.000 claims abstract description 123
- 238000012360 testing method Methods 0.000 claims abstract description 49
- 210000001503 joint Anatomy 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 230000007306 turnover Effects 0.000 description 22
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 12
- 238000009434 installation Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000009471 action Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 210000001364 upper extremity Anatomy 0.000 description 4
- 238000011160 research Methods 0.000 description 2
- 206010023230 Joint stiffness Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
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Abstract
The invention relates to the technical field of aerodynamics, and discloses a wind tunnel modularized contraction section system, which comprises a fixed contraction section and a movable contraction section, wherein a tensioning mechanism is arranged at an outlet of the fixed contraction section, a tension buckle which is in butt joint with the tensioning mechanism is arranged at an inlet of the movable contraction section, and a turning plate mechanism is arranged at an outlet of the movable contraction section; the tensioning mechanism comprises an oil cylinder mounting seat, a tensioning oil cylinder and a setting oil cylinder, wherein the setting oil cylinder is fixed on the oil cylinder mounting seat, the extending end of the setting oil cylinder is connected with the tensioning oil cylinder, the tensioning oil cylinder is rotatably arranged on the oil cylinder mounting seat, the extending end of the tensioning oil cylinder is fixedly provided with a pull rod, and the oil cylinder mounting seat is fixed at the outlet end of the fixed contraction section. The invention has simple structure and convenient use, can quickly replace the contraction sections with different sizes and structures according to test requirements, and can quickly and reliably replace and connect the contraction sections and the test sections, thereby meeting the wind tunnel test requirements and improving the wind tunnel test efficiency.
Description
Technical Field
The invention relates to the technical field of aerodynamics, in particular to a wind tunnel modular contraction section system.
Background
The wind tunnel is used as basic test equipment for aerodynamic research and aircraft development, and is equipment for driving airflow by adopting a power device and carrying out various aerodynamic tests according to the relative and similarity principles of motion. The characteristics of convenient test and low test cost make the device widely used in aerodynamic research. The wind tunnel mainly comprises a tunnel body, the tunnel body is provided with a test section which can carry out necessary measurement and observation on a model, a stable section which improves the uniformity of air flow and reduces the turbulence degree and a contraction section which accelerates the air flow to a required flow speed are arranged at the upstream of the test section, the contraction section is positioned between the stable section and the test section, the specific speed of incoming flow is provided for the test section, and the air flow quality is directly influenced.
With the improvement of technical requirements, test sections with various sizes are configured for the wind tunnel on the premise of meeting different tests, so that the shrink sections with different sizes are required to be replaced and connected with the test sections in a matching way. But the existing contraction section is of an integral structure, and is fixedly connected with the test section by adopting a stud nut connection mode, so that the problems of compact operation space, large stud nut replacement and connection workload, long time consumption, poor sealing between sections and the like exist during replacement.
Disclosure of Invention
In view of the above, the present invention provides a wind tunnel modular contraction section system, which can quickly replace contraction sections with different sizes and structures according to test requirements, and can quickly and reliably replace and connect the contraction sections with the test sections.
In order to solve the technical problems, the invention provides a wind tunnel modularized shrink section system, which comprises a fixed shrink section and a movable shrink section, wherein an outlet of the fixed shrink section is in butt joint with an inlet of the movable shrink section, an outlet of the movable shrink section is in butt joint with an inlet of a test section, a tensioning mechanism is arranged at the outlet of the fixed shrink section, a tension buckle in butt joint with the tensioning mechanism is arranged at the inlet of the movable shrink section, and a turning plate mechanism is arranged at the outlet of the movable shrink section;
The tensioning mechanism comprises an oil cylinder mounting seat, a tensioning oil cylinder and a setting oil cylinder, wherein the setting oil cylinder is fixed on the oil cylinder mounting seat, the extending end of the setting oil cylinder is fixedly connected with the tensioning oil cylinder, the tensioning oil cylinder is rotatably arranged on the oil cylinder mounting seat, a pull rod is fixed at the extending end of the tensioning oil cylinder, and the oil cylinder mounting seat is fixed at the outlet end of the fixed contraction section.
The panel turnover mechanism is a connection replacement device between the wind tunnel contraction section and the test section disclosed in the patent CN 112393874A.
The invention divides the contraction section into a fixed contraction section and a movable contraction section, and can select movable contraction sections with different sizes according to different sizes of the test section, for example, when the section size of the test section is 8m multiplied by 6m, the movable contraction section with the size of 8m multiplied by 6m is selected; the section size of the test section is 9.5m multiplied by 9.5m, and a movable contraction section of 9.5m multiplied by 9.5m is selected. The tensioning butt joint or release of the fixed contraction section and the movable contraction section is realized rapidly through the butt joint of the tensioning mechanism and the tensioning buckle; the movable contraction section and the test section are quickly connected through the panel turnover mechanism, so that the use requirement of the wind tunnel is met.
Further, the modularized shrink section system further comprises a spout extension section arranged at the outlet end of the movable shrink section, a locking mechanism is arranged at the outlet end of the movable shrink section, and a hook which is in butt joint with the locking mechanism is arranged on the spout extension section. The spout extension also includes a three-quarter spout and a floor. When a full-opening test is carried out, the downstream of the 8m multiplied by 6m movable contraction section is provided with a spout extension section; three-quarters opening test was performed with a three-quarter spout (obtained after removal of the base plate from the spout extension) fitted downstream of the 8m x 6m movable constriction.
Further, the locking mechanism comprises a locking air cylinder, an air cylinder mounting seat and a locking rod, wherein the locking air cylinder is fixed on the air cylinder mounting seat, the locking rod is connected with the locking air cylinder, the locking rod is rotatably arranged on the air cylinder mounting seat, a hanging rod is arranged on the air cylinder mounting seat, and the air cylinder mounting seat is fixed at the outlet end of the movable contraction section.
Further, to achieve quick installation of the spout extension and the movable constrictor, the modular constrictor system further includes a storage mechanism that stores the spout extension, the storage mechanism including a lifting device and a floor storage rack. The lifting device comprises a gear motor, a spiral lifter, a suspension arm, a guide rail and a lifting device mounting seat.
Further, the movable constrictor further comprises a front leg and a rear leg disposed on the housing.
Further, the sealing piece is arranged at the outlet end of the fixed contraction section, so that the butt joint tightness of the fixed contraction section and the movable contraction section can be improved. Preferably, the seal is an inflatable seal.
Furthermore, the profile curve of the contraction section is a hyperbolic curve, the pneumatic performance of the contraction section is good, and the quality of the outlet flow field is high.
Compared with the prior art, the low-speed wind tunnel modularized contraction section system provided by the invention has the advantages that the structure is simple, the use is simple and convenient, the contraction sections with different sizes and structures can be quickly replaced according to test requirements, meanwhile, the contraction sections and the test sections are quickly and reliably replaced and connected, the wind tunnel test requirements are met, and the wind tunnel test efficiency is improved.
Drawings
FIG. 1 is a schematic structural view of an 8m by 6m modular shrink section of the present invention;
FIG. 2 is a schematic view of the structure of an 8m by 6m movable constrictor of the present invention;
FIG. 3 is a schematic structural view of a 9.5mX9.5 m modular shrink section of the present invention;
FIG. 4 is a schematic diagram of the structure of a 9.5mX9.5 m movable constrictor of the present invention;
FIG. 5 is a schematic view of the structure of the rear section of the fixed contraction section of the present invention;
FIG. 6 is a schematic view of the structure of the tensioning mechanism A of the present invention;
FIG. 7 is a schematic view of the structure of the tightening mechanism B of the present invention;
FIG. 8 is a schematic view of the structure of the panel turnover mechanism of the present invention;
FIG. 9 is a schematic view of the structure of the spout extension of the present invention;
FIG. 10 is a schematic view of the storage mechanism of the present invention;
FIG. 11 is a schematic view of a storage mechanism of the present invention storing an extension of a spout;
FIG. 12 is a schematic view of the locking mechanism of the present invention;
FIG. 13 is a schematic view of the locking mechanism of the present invention uncoupled from the hanger;
FIG. 14 is a schematic view of the locking mechanism of the present invention attached to a hanger.
The marks in the figure:
1-fixing the contraction section; 2-8m x 6m movable constriction section; 3-9.5m x 9.5m movable constriction section; 4-spout extension; 5-a tensioning mechanism A; 6-a tensioning mechanism B; 7-a locking mechanism; 8-a panel turnover mechanism; 9-a storage mechanism; 10-an inflatable seal assembly;
11-fixing the front section of the contraction section; 12-fixing the rear section of the contraction section;
21-8m x 6m movable constrictor housing; 22-8m multiplied by 6m movable contraction section tensioning buckle; 23-8m x 6m movable pinch section front legs; 24-8m x 6m movable shrink section rear leg;
31-9.5m x 9.5m movable constrictor housing; 32-9.5m multiplied by 9.5m movable contraction section tensioning buckle; 33-9.5m x 9.5m movable constrictor front legs; 34-9.5m x 9.5m movable pinch section rear leg;
41-hooking; 42-three-quarters of a spout; 43-a bottom plate;
51-an oil cylinder mounting seat of a tensioning mechanism A; 52-a tensioning mechanism A tensioning cylinder; 53-the tensioning mechanism A sets an oil cylinder; 54-tensioning a mechanism A pull rod;
61-tensioning mechanism B oil cylinder mounting seat; 62-a tensioning mechanism B tensioning oil cylinder; 63-setting an oil cylinder of the tensioning mechanism B; 64-a tie-down mechanism B tie-bar;
71-locking a cylinder; 72-cylinder mounting base; 73-locking bar; 74-hanging rod; 75-fixed shaft
81-Tensioning means; 82-cylinder; 83-turning plate;
91-floor storage rack; 92-reducing motor; 93-screw elevator; 94-a suspension arm; 95-guide rails; 96-lifting device mounting base.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description. In the description of the present invention, it should be understood that the terms "upstream," "downstream," "south wall," "west wall," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Referring to fig. 1 to 4, the modular shrink section system provided by the present invention is divided into two major parts of a fixed shrink section 1 and a movable shrink section, wherein the fixed shrink section is divided into an upstream fixed shrink section front section 11 (reinforced concrete structure) and a downstream fixed shrink section rear section 12 (steel structure); the movable constrictor may be divided into 8m×6m movable constrictor 2 and 9.5m×9.5m movable constrictor 3 according to the outlet size. The outlet size of the two movable contraction sections is matched with the size of the downstream test section, and different movable contraction sections can be selected according to different sizes of the test sections. When a full-opening test is carried out, the downstream of the 8m multiplied by 6m movable contraction section is provided with a spout extension section; three-quarters opening test was performed with a three-quarter spout (obtained after removal of the base plate from the spout extension) fitted downstream of the 8m x 6m movable constriction. The structure of the 8m x 6m modular constriction (with spout extension) is shown in fig. 1, and the structure of the 9.5m x 9.5m modular constriction is shown in fig. 3.
Before the wind tunnel test is carried out, the assembly of each section of the wind tunnel needs to be completed. In order to ensure that the segments can enter the anechoic lobby smoothly, strict assembly sequences have been established for the segments. The shrink section assembly work is located after the test section assembly is completed, the assembly space is relatively narrow, so that the shrink section is required to be guided in the assembly space for moving, and the section collision is avoided. Take an 8m x 6m movable shrink section assembly as an example: the 8m multiplied by 6m movable compact segment 2 is stored in a position close to a western wall of a parking hall when being idle; in the process of switching the sections from the storage position to the working position, firstly, the sections are translated from the storage position to the entrance of the anechoic chamber hall by utilizing the air cushion module, and after a pair of guide wheels of the front landing leg 23 of the 8m multiplied by 6m movable compact section are inserted into the ground transverse guide rail, the sections are translated from the storage hall to the anechoic chamber hall by utilizing the air cushion until the axes of the sections are aligned with the axes of the wind tunnels; then a pair of guide pins in the middle of the lower cross beam of the 8m x 6m movable contraction section front leg 23 and the 8m x 6m movable contraction section rear leg 24 are inserted into the ground pin grooves to fix the axial positions thereof; then the air cushion is deflated, and after the landing leg landing plate is contacted with the ground, the tensioning mechanism of the rear section 12 of the fixed contraction section is controlled to drag the movable contraction section 2 with the length of 8m multiplied by 6m to the working position. The flap mechanism 8 at the outlet end is in a folded state during the movement of the segments to avoid interference with the test segments.
The rear section 12 of the fixed contraction section is positioned at the downstream outlet position of the front section 11 of the fixed contraction section, is in butt joint with the front section 11 of the fixed contraction section through a stud nut, and is integrally a steel structure section. Referring to fig. 5, a tensioning mechanism is provided at the outlet of the stationary contracting section rear section 12 for connecting the stationary contracting section rear section and the downstream movable contracting section, enabling the movable contracting section to move axially upstream and to be positioned, while preventing the movable contracting section from being axially displaced under the action of pneumatic load during testing. The tensioning mechanism is divided into a tensioning mechanism A5 and a tensioning mechanism B6 according to different angle control ranges, wherein the tensioning mechanism A is positioned at the upper and lower positions of the outlet of the rear section of the fixed contraction section, and total 4 sets are arranged; the tensioning mechanism B is positioned at the left and right positions of the outlet of the rear section of the fixed contraction section, and 2 sets of tensioning mechanisms are combined, as shown in figure 5. The outlet end face is formed by each side of the profile outlet of the rear section of the fixed contraction section, and the air-filling sealing assembly 10 is arranged on the outlet end face of the fixed contraction section, so that the sealing connection between the fixed contraction section and the movable contraction section is ensured.
Referring to fig. 6, the tensioning mechanism a comprises a tensioning mechanism a cylinder mounting seat 51, a tensioning mechanism a tensioning cylinder 52 and a tensioning mechanism a setting cylinder 53, wherein the tensioning mechanism a setting cylinder 53 is fixed on the tensioning mechanism a cylinder mounting seat 51, the extending end of the tensioning mechanism a setting cylinder 53 is connected with the tensioning mechanism a tensioning cylinder 52, the tensioning mechanism a tensioning cylinder 52 is rotatably arranged on the tensioning mechanism a cylinder mounting seat 51, and a tensioning mechanism a pull rod 54 is fixed at the extending end of the tensioning mechanism a tensioning cylinder 52. Wherein, the tensioning mechanism A tensioning cylinder 52 is used for providing tension for tensioning between sections; the setting oil cylinder 53 of the tensioning mechanism A is used for adjusting the angle of the tensioning oil cylinder 52 of the tensioning mechanism A, and a tensioning rod 54 of the tensioning mechanism A with a fixed extending end of the tensioning oil cylinder is placed in or separated from a tensioning buckle on the movable contraction section. Similarly, referring to fig. 7, the tensioning mechanism B includes a tensioning mechanism B cylinder mount 61, a tensioning mechanism B tensioning cylinder 62, and a tensioning mechanism B setting cylinder 63, and a tensioning mechanism B tie rod 64 is fixed to the extending end of the tensioning mechanism B tensioning cylinder 62.
The angle control range of the tensioning mechanism A is 0-20 degrees (interference with the tensioning buckle when the movable contraction section moves transversely is prevented), and the angle control range of the tensioning mechanism B is 0-55 degrees (interference with the inlet side wall of the movable contraction section when the movable contraction section moves transversely is prevented). The setting oil cylinder is used for changing the angle of the tensioning oil cylinder, so that the pull rod of the tensioning oil cylinder is placed in or separated from the hook on the movable contraction section. After the set oil cylinder places the pull rod of the tensioning oil cylinder in the hook position, the distance between the movable contraction section and the rear section of the fixed contraction section can be changed by using the tensioning oil cylinder, so that tensioning and disengaging of the mechanism are realized. The setting and tensioning oil cylinder is provided with limit switches at the extending and retracting limit positions, so that the state of the oil cylinder can be fed back.
The control flow of the tightening mechanism a and the control flow of the tightening mechanism B are the same, and only the control flow of the tightening mechanism a will be described herein, and the control flow of the tightening mechanism B may be performed with reference to the tightening mechanism a. Before the movable contraction section is installed, the setting oil cylinder 53 of the tensioning mechanism A and the tensioning oil cylinder 52 of the tensioning mechanism A are controlled to retract to the shortest stroke, the angle of the tensioning oil cylinder is guaranteed to be 20 degrees, interference with the head of the oil cylinder piston rod in the transverse movement process of the movable contraction section is prevented, and at the moment, the tensioning oil cylinder and the setting oil cylinder both trigger the shortest stroke limit switch and send out electric signals for displaying the state of the mechanism. After the movable contraction section is aligned with the fixed contraction section Duan Zhouxiang, the tensioning oil cylinder is controlled to extend to the longest stroke, interference between the tensioning mechanism and the tensioning buckle of the movable contraction section is prevented when the angle of the setting oil cylinder is adjusted, and the tensioning oil cylinder triggers the furthest stroke limit switch at the moment, so that the setting oil cylinder keeps the shortest stroke. And then the setting oil cylinder is controlled to extend to the rated farthest stroke, the angle of the tensioning oil cylinder is adjusted from 20 degrees to 0 degrees, and at the moment, the setting oil cylinder triggers the rated farthest stroke limit switch, and the tensioning oil cylinder keeps the farthest stroke. After the guide pins of the front and rear supporting legs of the movable contraction section are in place, the tensioning oil cylinder is controlled to retract to the shortest stroke, the movable contraction section is driven to move to the working position upstream, the tensioning oil cylinder triggers the shortest stroke limit switch, and the setting oil cylinder keeps the rated farthest stroke. In the wind tunnel test process, the tensioning mechanism cylinder maintains pressure, so that the movable contraction section is prevented from axial displacement under the action of pneumatic load. When the movable contraction section is disassembled, the tensioning mechanism runs reversely.
Referring to fig. 2, the 8m×6m movable contraction section is located at a downstream outlet position of the fixed contraction section when in operation, and is drawn and butted by a fixed contraction section rear section tensioning mechanism, and is integrally a steel structure section, and the movable contraction section comprises 8m×6m movable contraction section shells 21, 8m×6m movable contraction section tensioning buckles 22, 8m×6m movable contraction section front support legs 23, 8m×6m movable contraction section rear support legs 24, a turning plate mechanism 8, a locking mechanism 7 of a nozzle extension section, guide pins, guide wheels, an air cushion module and other components. The plate turnover mechanism 8 is arranged at the outlet position of the 8m multiplied by 6m movable contraction section shell, 14 sets are arranged at the top and the bottom, 4 sets are arranged at the top and the bottom, and 3 sets are arranged at the left and the right sides. Referring to fig. 8, each set of flap mechanism consists of 2 cylinders 82, 2 tensioners 81 and 1 flap 83. When the turnover plate mechanism works, the air cylinder 82 pushes the turnover plate 83 to turn inwards, and when the contraction section moves transversely along the guide rail, the turnover plate can provide an axial distance of about 37mm between the contraction section and the test section, so that necessary axial space is reserved for the movable contraction section to enter and exit the wind tunnel loop; after the movable contraction section is installed in place, the mechanism reversely operates to overlap with the inlet of the downstream test section to form a closed inner flow passage. The overturning angle range of the turnover plate mechanism is 0-73 degrees. The structure and the working principle of the plate turnover mechanism are the same as those of the connection replacement device between the wind tunnel contraction section and the test section disclosed in the patent CN 112393874A.
The control flow of the plate turnover mechanism is as follows: before the 8m multiplied by 6m movable contraction section enters the working position, the turning plate is in a folded state, the air cylinder is in a free extending state, the turning plate keeps the angle (73 degrees) of the turning plate under the action of the tensioning device, and the rated farthest travel limit switch of the air cylinder is in a triggering state. After the 8m multiplied by 6m movable contraction section determines the axial position, the cylinder is driven to retract, the turning plate is driven to rotate around the hinge until the turning plate is overlapped with the inner wall surface of the test section (or overlapped with the inner wall surface of the nozzle extension section), at the moment, the cylinder stops air supply and is in a free retraction state, the turning plate keeps a turning angle (0 DEG) under the action of the tensioning device, and at the moment, the rated shortest stroke limit switch of the cylinder is in a triggering state. Each set of the plate turnover mechanism is driven by 2 air cylinders, so that 2 air cylinders of the same set of the plate turnover mechanism have synchronous operation requirements. Each panel turnover mechanism is independently controlled. When the panel turnover mechanism turns outwards from a folded state, the panel turnover mechanism at the upper and lower positions is required to be completed, and then the panel turnover mechanisms at the left and right sides are required to be operated, so that interference between the panel turnover mechanisms is prevented, and the inward turning process of the panel turnover mechanism is opposite to the inward turning process. The turning plate mechanisms on the same side are required to be controlled in sequence to finish turning.
Referring to fig. 4, the movable contraction section with the length of 9.5mx9.5m is located at the downstream outlet position of the fixed contraction section when in operation, and is drawn and butted by the fixed contraction section rear section tensioning mechanism, and the whole structure is a steel structure section, comprising a movable contraction section shell 31 with the length of 9.5mx9.5m, a movable contraction section tensioning buckle 32 with the length of 9.5mx9.5m, a movable contraction section front supporting leg 33 with the length of 9.5mx9.5m, a movable contraction section rear supporting leg 34 with the length of 9.5mx9.5m, a turning plate mechanism 8, guide pins, guide wheels, an air cushion module and the like. The plate turnover mechanism is arranged at the outlet position of the 9.5m multiplied by 9.5m movable contraction section shell, 20 sets are arranged, 5 sets are arranged on the upper wall surface and the lower wall surface respectively, and 5 sets are arranged on the left side and the right side respectively. The structure form and the function of the plate turnover mechanism are the same as those of the 8m multiplied by 6m movable contraction section plate turnover mechanism.
Referring to fig. 2, spout extension locking mechanisms 7 are installed at the left and right sides of the 8m×6m movable contraction section outlet for connecting and fixing the 8m×6m movable contraction section 2 with the spout extension 4. Referring to fig. 12, the locking mechanism 7 mainly comprises a locking cylinder 71, a cylinder mounting seat 72 and a locking rod 73, wherein the locking cylinder 71 is fixed on the cylinder mounting seat 72, the locking rod 73 is connected with the locking cylinder 71, the locking rod 73 is rotationally fixed on the cylinder mounting seat 72 through a fixing shaft 75, and a hanging rod 74 which is convenient for hanging the nozzle extension section hanging hook 41 is arranged on the cylinder mounting seat 72. The motion flow of the locking mechanism 7 is shown in fig. 13 and 14, and in fig. 13, before the spout extension section is installed, the locking cylinder 71 of the locking mechanism on the movable contraction section is in a free extending state, so that interference between the locking rod and the spout extension section is avoided, and the furthest travel limit switch of the cylinder is in a trigger state. And then the storage mechanism of the nozzle extension section is utilized to carry out the installation work of the nozzle extension section. After the movable contraction section 2 with the 8m multiplied by 6m carries the spout extension section 4 to the anechoic chamber hall and the section installation is completed, the locking cylinder 71 of the locking mechanism 7 is communicated with an air source, the locking cylinder 71 is controlled to retract, the locking rod 73 is driven to rotate around the fixed shaft 75 until the locking rod 73 is contacted with a notch on the hook 41 of the spout extension section, the cylinder continuously supplies air to prevent the spout extension section from loosening, and simultaneously the spout extension section is prevented from vibrating under the air flow pulsation pressure (see fig. 14), and at the moment, the cylinder triggers a rated shortest travel limit switch.
Referring to fig. 9, the spout extension 4 is a straight steel structural section such as an inner flow path, and is mainly used for performing an 8m×6m opening test and a three-quarter opening test, and is mainly composed of a three-quarter spout 42, a bottom plate 43, a hook 41, and the like. The nozzle extension section installation flow is divided into: 8m x 6m movable contraction section moving alignment process and spout mounting process. In the moving alignment process of the 8m multiplied by 6m movable compact section, firstly, the 8m multiplied by 6m movable compact section is moved to a hall parking aisle by utilizing an air cushion module, the direction is rotated, and the outlet of the section is opposite to the hall parking south wall. The sections are moved toward the spout extension storage rack in an air-cushion floating state. When approaching the south wall, the axial guide wheels on the right sides of the front and rear supporting legs are required to be inserted into the ground guide rail to guide the movement of the sections; then a pair of guide pins on the front and rear leg crossbeams are inserted into the ground pin grooves to fix the axial positions of the sections; at the moment, the locking cylinder of the spout extension segment locking mechanism is in a free extending state, so that interference with the spout extension segment during butt joint of the segments is avoided. The segment is slowly moved until the segment is aligned with the spout extension. The flap mechanism is in a folding state in the alignment process of the 8m multiplied by 6m movable contraction section, so that the mechanism is prevented from interfering with the spout extension section. And after the alignment process of the 8m multiplied by 6m movable contraction section is completed, the nozzle extension section is installed.
Referring to fig. 10 and 11, the storage mechanism 9 is mainly used for disassembling, storing and installing the spout extension, and comprises a lifting device and a bottom plate storage rack 91, wherein the lifting device comprises a gear motor 92, a screw lifter 93, a suspension arm 94, a guide rail 95 and a lifting device mounting seat 96, the gear motor 92 provides power to drive the screw lifter 93 to lift or fall for advancing, and the lifting device is mainly used for assisting in realizing the installation and the disassembly of the spout extension and the installation and the disassembly of the bottom plate of the spout extension. When the lifting device operates, the gear motor 92 provides power, the suspension arm 94 carries the spout extension section 4 to move up and down in the guide rail 95 under the action of the spiral lifter 93, and the spout extension section is assembled, disassembled and parked in a matched mode. The motion flow of the lifting device is divided into two flows of installation and disassembly of the nozzle extension section and installation and disassembly of the bottom plate of the nozzle extension section.
When the spout extension section is stored, the movable contraction section with the length of 8m multiplied by 6m carries the spout extension section to move to the front of the storage mechanism, and at the moment, the lifting device hook is in the lower limit. After alignment adjustment, the hanging point of the spout extension is aligned with the vertical direction of the hanger of the lifting device hanging arm 94. The gear motor 92 is driven and the lifting device is raised and the spout extension 4 is lifted by the hook of the suspension arm 94 until the spout extension is lifted off the 8m x 6m movable constrictor. The 8m x 6m movable contraction section is retracted and separated by the air cushion module, and the nozzle extension section is stored on the hanging wall of the lifting device. The control flow of the spout extension installation process and the spout extension storage process are reversed. The lifting of the lifting device is controlled by a person, and the control console is arranged on the storage rack ladder platform. The operator observes the section butt joint condition on the ladder platform and controls the lifting of the lifting device according to the actual condition.
When the bottom plate of the nozzle extension section is disassembled, the reducing motor of the pre-driving lifting device controls the suspension arm to carry the nozzle extension section to descend to the lower limit, and then controls the hydraulic jack to ascend until the hydraulic jack contacts with the jack pad plate of the bottom plate of the nozzle extension section and bears force; after the bolts of the three-quarter nozzle and the bottom plate are disassembled, the hydraulic jack is controlled to slowly descend, the bottom plate descends along with the disassembly and the storage of the nozzle extension bottom plate are completed until the storage base plate of the bottom plate is contacted with the bottom plate storage rack 91 and the safety lock pin is inserted. The mounting process of the base plate is reversed.
In conclusion, the low-speed wind tunnel modularized contraction section system provided by the invention has the advantages that the structure is simple, the use is simple and convenient, the contraction sections with different sizes and structures can be quickly replaced according to the test requirements, meanwhile, the contraction sections and the test sections are quickly and reliably replaced and connected, the test requirements of wind tunnels with different sizes are met, and the wind tunnel test efficiency is improved.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A wind tunnel modular shrink section system, characterized by: the device comprises a fixed contraction section and a movable contraction section, wherein an outlet of the fixed contraction section is in butt joint with an inlet of the movable contraction section, an outlet of the movable contraction section is in butt joint with an inlet of a test section, a tensioning mechanism is arranged at the outlet of the fixed contraction section, a tensioning buckle in butt joint with the tensioning mechanism is arranged at the inlet of the movable contraction section, and a turning plate mechanism is arranged at the outlet of the movable contraction section;
The tensioning mechanism comprises an oil cylinder mounting seat, a tensioning oil cylinder and a setting oil cylinder, wherein the setting oil cylinder is fixed on the oil cylinder mounting seat, the extending end of the setting oil cylinder is fixedly connected with the tensioning oil cylinder, the tensioning oil cylinder is rotatably arranged on the oil cylinder mounting seat, a pull rod is fixed at the extending end of the tensioning oil cylinder, and the oil cylinder mounting seat is fixed at the outlet end of the fixed contraction section.
2. A wind tunnel modular shrink section system as claimed in claim 1 wherein: the movable shrinkage section is characterized by further comprising a spout extension section arranged at the outlet end of the movable shrinkage section, a locking mechanism is arranged at the outlet end of the movable shrinkage section, and a hook in butt joint with the locking mechanism is arranged on the spout extension section.
3. A wind tunnel modular shrink section system as claimed in claim 2 wherein: the locking mechanism comprises a locking air cylinder, an air cylinder mounting seat and a locking rod, wherein the locking air cylinder is fixed on the air cylinder mounting seat, the locking rod is connected with the locking air cylinder, the locking rod is rotatably arranged on the air cylinder mounting seat, a hanging rod is arranged on the air cylinder mounting seat, and the air cylinder mounting seat is fixed at the outlet end of the movable contraction section.
4. A wind tunnel modular shrink section system as claimed in claim 2 wherein: the spout extension includes a three-quarter spout and a floor.
5. A wind tunnel modular shrink section system as claimed in claim 2 wherein: the device also comprises a storage mechanism for storing the spout extension section, wherein the storage mechanism comprises a lifting device and a bottom plate storage rack.
6. A wind tunnel modular shrink section system as claimed in claim 5 wherein: the lifting device comprises a gear motor, a spiral lifter, a suspension arm, a guide rail and a lifting device mounting seat.
7. A wind tunnel modular shrink section system as claimed in claim 1 wherein: the movable constrictor also includes front and rear legs disposed on the housing.
8. A wind tunnel modular shrink section system as claimed in claim 1 wherein: and a sealing element is arranged at the outlet end of the fixed contraction section.
9. A wind tunnel modular shrink section system as claimed in claim 1 wherein: the profile curve of the wind tunnel modularized shrink section system is a hyperbolic curve.
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| CN202410335658.1A CN117928881B (en) | 2024-03-22 | 2024-03-22 | Wind tunnel modularized shrink section system |
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| CN202410335658.1A CN117928881B (en) | 2024-03-22 | 2024-03-22 | Wind tunnel modularized shrink section system |
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