CN110361156B - Wind tunnel test section inner core with continuously adjustable Mach number - Google Patents
Wind tunnel test section inner core with continuously adjustable Mach number Download PDFInfo
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- CN110361156B CN110361156B CN201910777290.3A CN201910777290A CN110361156B CN 110361156 B CN110361156 B CN 110361156B CN 201910777290 A CN201910777290 A CN 201910777290A CN 110361156 B CN110361156 B CN 110361156B
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- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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Abstract
The invention discloses a mach number adjustable wind tunnel test section inner core which comprises a top plate, a left side plate, a right side plate, a flange, a model turntable mechanism, a shock plate mechanism and a driving mechanism, wherein the top plate is fixedly connected with the left side plate; the shock wave plate mechanism comprises a shock wave plate, the top plate, the left side plate and the right side plate form a hollow cavity, and a flange is arranged at the front end of the hollow cavity; the front end of the shock plate close to the flange is connected through a shock shaft assembly rotating shaft, the rear end of the shock plate far from the flange is connected with a driving mechanism, and the driving mechanism drives the shock plate to rotate around the shock shaft assembly; the model turntable mechanism comprises a turntable support, a model turntable and a first connecting plate, one end of the first connecting plate is fixedly connected with the rear end of the shock plate, and the other end of the first connecting plate is fixedly connected with the turntable support. The test section inner core provided by the invention can generate oblique shock waves with different shock wave angles by adjusting the rotating position of the shock wave plate, so that the continuous change of the Mach number of the backward airflow is realized.
Description
Technical Field
The application relates to the technical field of wind tunnel equipment, in particular to a wind tunnel test section inner core with continuously adjustable Mach number.
Background
With the rapid development of aerospace industry in China, the requirements of air and power test equipment are higher and higher, and the types of the test equipment are more and more complete. In an aerodynamic test of an aerospace vehicle, the wind tunnel test capability with continuously adjustable Mach number is important for research. At the present stage, the air and power test equipment at home and abroad uses the method of changing the total pressure of the front chamber by using the spray pipes with different sound velocities to obtain the corresponding test Mach number. In order to obtain different Mach numbers, the Mach number can only be continuously adjusted in one test process by replacing the spray pipe after the test is finished. Therefore, a wind tunnel test device capable of continuously adjusting the Mach number in a test process is needed.
Disclosure of Invention
The invention provides an inner core of a wind tunnel test section with an adjustable Mach number, which aims to solve or partially solve the technical problem that the Mach number of the wind tunnel test section at the present stage cannot be continuously adjusted in a one-time test process.
In order to solve the technical problem, the invention provides a wind tunnel test section inner core with continuously adjustable Mach number, which comprises a top plate, a left side plate, a right side plate, a flange, a model turntable mechanism, a shock plate mechanism and a driving mechanism, wherein the top plate is provided with a left side plate and a right side plate;
the shock wave plate mechanism comprises a shock wave plate, the top plate, the left side plate and the right side plate form a hollow cavity, the hollow cavity is provided with a front end and a rear end, and a flange is arranged at the front end of the hollow cavity;
the front end of the shock wave plate close to the flange is connected between the left side plate and the right side plate through a shock wave shaft assembly rotating shaft, the rear end of the shock wave plate far from the flange is connected with a driving mechanism, and the driving mechanism drives the shock wave plate to rotate around the shock wave shaft assembly;
the model turntable mechanism comprises a turntable support, a model turntable and a first connecting plate, wherein one end of the first connecting plate is fixedly connected with the rear end of the shock plate, and the other end of the first connecting plate is fixedly connected with the turntable support; the turntable support is used for mounting a model turntable;
the inner core of the wind tunnel test section is fixedly connected to the test section of the wind tunnel through a flange, and when test airflow blows, the driving mechanism drives the shock wave plate to rotate around the shock wave shaft assembly, so that the shock wave plate generates oblique shock waves with continuously variable shock wave angles in the hollow cavity, and continuous change of wave-rear Mach number is controlled; the laser plate synchronously drives the turntable support in the rotating process so as to realize the synchronous adjustment of the position of the model turntable.
Optionally, the upper surface and/or the side surface of the first connecting plate is provided with more than two first connecting holes;
the turntable support is of a hollow structure and comprises two turntable support side plates, and the turntable support side plates are provided with more than two second connecting holes on the plate surfaces at different heights;
more than one third connecting hole is formed in the model turntable;
the other end of the first connecting plate is in screwed connection with the turntable support through a first connecting hole and a second connecting hole; the model turntable and the turntable support are connected together in a screwed mode through the third connecting hole and the second connecting hole.
Optionally, the number of the shock wave shaft assemblies is two, the left side plate and the right side plate are respectively provided with a first round hole, two sides of the shock wave plate are provided with a second round hole, and one set of shock wave shaft assemblies is mounted to the first round hole on the left side plate and the second round hole on the left side of the shock wave plate; and the other set of shock shaft assembly is arranged to the first round hole on the right side plate and the second round hole on the right side of the shock plate.
Each set of shock shaft assembly comprises a shock shaft, a baffle plate, a shaft sleeve, a shock shaft bearing and a first round nut;
one end of the shock wave shaft is arranged in the first round hole; the shock wave shaft bearing is positioned in the first round hole, and the inner ring of the shock wave shaft bearing is sleeved on the shock wave shaft; the shaft sleeve is arranged on the shock wave shaft and used for adjusting the relative position of the shock wave shaft bearing on the shock wave shaft; the round nut is arranged on the outer side of the shaft sleeve and used for axially pressing the shaft sleeve;
the other end of the shock wave shaft is installed in a second round hole adjacent to the first round hole, and the baffle plate is used for axially fastening the other end of the shock wave shaft.
Optionally, the driving mechanism includes a motor reducer module, a lead screw module, a chassis, a strut, a first hinge assembly, and a second hinge assembly;
the motor reducer module is connected with the screw rod module so as to drive the screw rod module to horizontally reciprocate on the bottom frame;
a first hinge assembly is arranged at one end, close to the motor reducer module, of the screw rod module, the bottom end of the support rod is hinged with the screw rod module through the first hinge assembly, and the top end of the support rod is hinged with the rear end of the laser plate through a second hinge assembly;
when the lead screw module horizontally reciprocates on the underframe, the relative position and the horizontal included angle of the bottom end of the stay bar in the horizontal direction are adjusted through the first hinge assembly, and then the rotation of the shock wave plate around the shock wave shaft is controlled through the top end of the stay bar and the second hinge assembly, so that the shock wave angle of oblique shock waves is continuously adjusted.
Furthermore, the driving mechanism also comprises a coupling, a spacer bush, a front end plate and a rear end plate; the screw module comprises a screw, a screw bearing, a linear guide rail, a screw pressing plate and a sleeve ring;
the motor reducer module is fixedly connected to the front end plate; the shaft coupling is connected with an output shaft and a lead screw of the motor reducer module;
the two sets of screw rod bearings are respectively arranged at two ends of the screw rod; and are respectively fixedly connected with the front end plate and the rear end plate;
the spacer bush is arranged at one end of the screw rod connected with the coupler and used for adjusting the position of the screw rod bearing;
the underframe is of a groove-shaped structure, two ends of the underframe are respectively connected with the front end plate and the rear end plate, and screw holes are formed in two sides of the inner wall of the underframe and used for connecting the linear guide rails;
the front end plate is arranged at one end of the bottom frame close to the spacer bush, and a round hole is formed in the middle of the front end plate and used for mounting a lead screw bearing;
the rear end plate is arranged at the other end of the bottom frame far away from the spacer bush, and a round hole is formed in the middle of the rear end plate and used for mounting a screw rod bearing;
the screw rod is arranged in the circular holes of the connecting beam, the front end plate and the rear end plate;
a screw rod mounting round hole is formed in the middle of the connecting beam for mounting a screw rod, and the end face, close to the front end plate, of the connecting beam is connected with the first hinge assembly;
the screw rod pressing plate is mounted to the rear end plate and used for pressing the screw rod bearing;
the lantern ring is arranged at the tail end of the lead screw and used for adjusting the relative position of a lead screw bearing on the tail end of the lead screw;
two sets of linear guide rails are respectively installed on two sides of the inner wall of the underframe, and sliding blocks of the linear guide rails are installed on the connecting beam.
Optionally, the wind tunnel test section inner core further comprises a second connecting plate and a lifting mechanism;
more than two sets of second connecting plates are arranged above the top plate, and each set of second connecting plates is fixedly connected with the left side plate and the right side plate respectively;
the hoist mechanism is more than two sets, installs respectively to the second connecting plate farthest apart from the flange distance on, and connect the roof, hoist mechanism includes: the device comprises a connecting seat, a bidirectional thrust bearing, a bearing pressing plate, a screw, an outer cylinder, a lifting shaft, a guide flat key, a pulling plate, a base and a pin shaft;
the connecting seat is used for connecting the lifting mechanism and the second connecting plate;
the bidirectional thrust bearing is arranged in the connecting seat;
the bearing pressing plate is arranged on the connecting seat and used for axially fastening the bidirectional thrust bearing;
the screw is arranged on the bidirectional thrust bearing, and the upper end head of the screw is fastened by a nut;
the lifting shaft is fixedly connected with the screw rod, and a guide flat key is arranged on the outer surface of the lifting shaft;
the outer cylinder is fixedly connected with the connecting seat, and a sliding key groove is formed in the outer cylinder; so that the guide flat key slides in the sliding key groove;
one end of the base is fixedly connected with the top plate, and the other end of the base is provided with a pin hole;
a pin hole is formed in one end, close to the top plate, of the lifting shaft, and pin holes are formed in two ends of the pulling plate;
the pin shafts respectively penetrate through the pin holes to connect the lifting shaft, the pulling plate and the base.
Optionally, the wind tunnel test section inner core is equipped with at least one set of first observation window mechanism on left side board and/or right side board respectively, and first observation window mechanism includes: the first window frame, the inner ring and the first pressure ring;
the first window frame is mounted to the left side plate or the right side plate;
the inner ring is mounted into the first window frame;
the first press ring is arranged in the first window frame and fixedly connected with the first window frame so as to press the inner ring.
Further, the device also comprises a second observation window mechanism; the second observation window mechanism is arranged on the top plate or the inner ring of the first observation window mechanism; the second observation window includes: the second window frame, the second pressure ring and the glass;
the second window frame is mounted to the top plate, or the inner ring of the first observation window mechanism;
the second pressing ring is fixedly connected with the second window frame so as to press the glass;
the glass is mounted into a second sash.
Optionally, the wind tunnel test section inner core further comprises more than two sets of wheel mechanisms, and the wheel mechanisms are mounted to the bottoms of the left side plate or the right side plate; the wheel mechanism includes: a wheel mount, a wheel bearing, a wheel axle, a wheel, and a wheel bearing cap;
the wheel seat is fixedly connected with the left side plate or the right side plate;
the wheel bearing is mounted to the wheel base;
the wheel shaft is mounted to the wheel bearing;
the wheel is mounted to the wheel axle;
the wheel bearing cover is fixedly connected with the wheel seat and used for axially fixing the wheel bearing.
The invention also provides a wind tunnel device which comprises the wind tunnel test section inner core with any one of the continuously adjustable Mach numbers.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a wind tunnel test section inner core with adjustable Mach number, which drives a shock wave plate to rotate through a driving mechanism, so that an adjustable shock wave angle is formed in a test section inner cavity formed by the shock wave plate, a top plate, a left side plate and a right side plate, and oblique shock waves with different shock wave angles can be generated by adjusting the rotating position of the shock wave plate when test airflow blows. With the progress of the test, the change of the shock wave angle can be continuously controlled by controlling the driving mechanism, so that the continuous change of the Mach number after the wave is generated; on the other hand, when the position of the shock wave plate is dynamically adjusted, the model turntable mechanism is connected into a whole through the first connecting plate, the position adjustment of the shock wave plate synchronously drives the position adjustment of the model turntable mechanism, an attack angle mechanism does not need to be additionally arranged at the moment, the integration of the angle of the test model installed on the model turntable and the angle adjusted by the shock wave plate is realized, and the accuracy of wind tunnel test data is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a physical schematic diagram of an oblique shock wave according to an embodiment of the present invention
FIG. 2 is a front view of an inner core of a continuously variable Mach number test section according to an embodiment of the present invention;
FIG. 3 is a left side view of an inner core of a continuously variable Mach number test section according to an embodiment of the present invention;
FIG. 4 is a top view of a continuously variable Mach number test section inner core provided by an embodiment of the present invention;
FIG. 5 is an isometric view of an inner core of a continuously variable Mach number test section provided by an embodiment of the present invention;
FIG. 6 is a cross-sectional view A-A of FIG. 3 according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line K-K of FIG. 6 in accordance with an embodiment of the present invention;
FIG. 8 is a cross-sectional view taken along line B-B of FIG. 2 according to an embodiment of the present invention;
FIG. 9 is a cross-sectional view D-D of FIG. 3 according to an embodiment of the present invention;
FIG. 10 is a cross-sectional view E-E of FIG. 9 according to an embodiment of the present invention;
FIG. 11 is a cross-sectional view taken at H-H in FIG. 6 according to an embodiment of the present invention;
FIG. 12 is a cross-sectional view taken along line G-G of FIG. 4 in accordance with an embodiment of the present invention;
FIG. 13 is a cross-sectional view C-C of FIG. 2 according to an embodiment of the present invention;
FIG. 14 is a cross-sectional view F-F of FIG. 4 according to an embodiment of the present invention;
FIG. 15 is a cross-sectional view J-J of FIG. 6 according to an embodiment of the present invention;
description of reference numerals:
1-a flange; 2-a top plate; 3-left side plate; 4-right side plate; 5-a second connecting plate; 6-a third connecting plate; 7-a wheel mechanism; 8-a lifting mechanism; 9-a second viewing window mechanism; 10-a first viewing window mechanism; 11-a laser plate; 12-a strut; 13-a drive mechanism; 14-a first hinge assembly; 15-shock shaft assembly; 16-a model carousel; 17-wheel seat; 18-wheel bearing cap; 19-wheel axle; 20-a wheel; 21-wheel bearing; 22-a connecting seat; 23-a bearing press plate; 24-a screw; 25-outer cylinder; 26-a lift shaft; 27-pulling a plate; 28-a base; 29-a pin shaft; 30-a bidirectional thrust bearing; 31-a second sash; 32-a second pressure ring; 33-glass; 34-a first sash; 35-inner ring; 36-a first pressure ring; 37-connecting beams; 38-a chassis; 39-rear end plate; 40-a front end plate; 41-motor reducer module; 42-lead screw press plate; 43-a collar; 44-a coupling; 45-spacer bush; 46-a lead screw; 47-lead screw bearing; 48-linear guide rail; 49-hinge shaft; 50-hinge bearing; 51-a second round nut; 52-hinge bearing cap; 53-shock axis; 54-a baffle; 55-shaft sleeve; 56-shock shaft bearing; 57-first round nut; 58-front connecting leg; 59-rear connecting leg; 60-a guide flat key; 61-a first connection plate; 62-a turntable support; 63-pin screw; 64-hexagonal nuts; 65-a second hinge assembly; 66-slide block.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
In brief, the structure of a wind tunnel can be generally summarized as a tunnel body, a driving system and a control system, wherein the tunnel body is divided into a plurality of parts such as a contraction section, a stabilization section and a test section, wherein the test section is a place where the wind tunnel carries out necessary aerodynamic measurement and observation on a model. The upstream of the test section is provided with a stabilizing section for improving the air flow uniformity and reducing the turbulence degree, a contraction section for accelerating the air flow to the required flow speed and a spray pipe. The downstream of the test section is provided with a diffusion section for reducing the flow velocity and the energy loss and an exhaust section for guiding airflow to the outside of the wind tunnel or a backflow section for guiding airflow back to the wind tunnel inlet. The type of wind tunnel is generally divided using mach number Ma: a low-speed wind tunnel with Ma less than or equal to 0.4; a transonic wind tunnel with Ma being 0.4-1.4; the ultrasonic wind tunnel with the Ma being 1.5-4.5 and the hypersonic wind tunnel with the Ma being more than or equal to 5.
In an aerodynamic test of an aerospace vehicle, the wind tunnel test capability with continuously adjustable Mach number is important for research. At the present stage, the air and power test equipment at home and abroad uses the method of changing the total pressure of the front chamber by using the spray pipes with different sound velocities to obtain the corresponding test Mach number. In order to obtain different Mach numbers, the Mach number can only be continuously adjusted in one test process because the method of replacing the spray pipe after the test is completed can be used. On the other hand, in the process of replacing the spray pipe, the workload of workers is large, the efficiency is low, and a large number of different sound velocitiesThe spray pipes occupy a large area of the site, and the workload of equipment maintenance is large. Based on the problems, the invention designs the inner core of the wind tunnel test section capable of continuously changing the Mach number of the airflow in one test by utilizing the physical principle that the supersonic fluid can generate oblique shock waves when encountering wedge-shaped objects, and the Mach number of the fluid can generate sudden change when passing through the oblique shock waves. The physical principle of the present embodiment is that, as shown in fig. 1, the incoming flow mach number M is known1The angle beta of oblique shock wave and Mach number M after passing through the shock wave can be calculated according to the deflection angle theta2The theta-beta-M relationship can be obtained by using a continuity equation and the condition that the flow velocity tangential component is not changed when passing through the shock wave, namely, theta can be expressed as M1β and γ, where γ represents the heat capacity ratio:
mach number M of airflow passing through oblique laser wave2Then is
As shown in fig. 2 to 6, the present embodiment provides a wind tunnel test section inner core with an adjustable mach number, which includes a top plate 2, a left side plate 3, a right side plate 4, a flange 1, a model turntable mechanism, a shock plate mechanism and a driving mechanism 13;
the shock wave plate mechanism comprises a shock wave plate 11, the top plate 2, the left side plate 3 and the right side plate 4 form a hollow cavity, the hollow cavity is provided with a front end and a rear end, and the front end of the hollow cavity is provided with a flange 1;
the front end of the shock wave plate 11 close to the flange 1 is connected between the left side plate 3 and the right side plate 4 through a shock wave shaft assembly 15 in a rotating shaft mode, the rear end, far away from the flange 1, of the shock wave plate 11 is connected with a driving mechanism 13, and the driving mechanism 13 drives the shock wave plate 11 to rotate around the shock wave shaft assembly 15;
the model turntable mechanism comprises a turntable support 62, a model turntable 16 and a first connecting plate 61, wherein one end of the first connecting plate 61 is fixedly connected with the rear end of the shock plate 11, and the other end of the first connecting plate 61 is fixedly connected with the turntable support 62; the turntable support 62 is used for mounting the model turntable 16;
wherein, flange 1 is located the foremost end of test section inner core, connects roof 2, left side board 3 and right side board 4 together through flange 1, forms the cavity structure with shock plate 11 together, has arranged the bolt hole of being connected with other equipment on the flange 1 to test section inner core fixed connection to the wind-tunnel.
Optionally, the test section inner core further comprises second connecting plates 5 and third connecting plates 6, the number of the second connecting plates 5 can be more than two, preferably six, and the second connecting plates 5 are located above the top plate 2, each set of the second connecting plates 5 is respectively fixedly connected with the top ends of the left side plate 3 and the right side plate 4, and a bolt connection and a thread connection mode can be adopted; the number of the third connecting plates 6 can be more than two, preferably four, and the third connecting plates 6 are located at the bottom of the inner core of the test section and fixedly connected with the bottoms of the left side plate 3 or the right side plate 4 in a bolt connection or threaded connection mode. The second connecting plate 5 and the third connecting plate 6 can improve the connection stability of the left side plate 3 and the right side plate 4 of the test section inner core.
When a wind tunnel test is carried out, an inner core of the wind tunnel test section is fixedly connected to the test section of the wind tunnel through a flange 1, and when test airflow blows, a driving mechanism 13 drives a shock wave plate 11 to rotate around a shock wave shaft assembly 15, so that the shock wave plate 11 generates oblique shock waves with continuously variable shock wave angles in a hollow cavity, and continuous change of wave-rear Mach numbers is controlled; the laser plate 11 drives the turntable support 62 synchronously during rotation, so as to realize synchronous adjustment of the position of the model turntable 16.
The shock wave plate 11 can be rectangular, and in order to meet the requirement of the test, the length of the shock wave plate 11 is more than 2.4 meters, and the width is adjusted according to the distance between the left side plate and the right side plate of the inner core of the test section. The shock plate 11 may be made of a metal material, such as steel or aluminum, but is not limited thereto, and the adjustable range of the horizontal included angle of the shock plate 11 may be 0 to 15 °.
This embodiment provides a mach number adjustable wind tunnel test section inner core, orders about the swash plate through actuating mechanism and rotates, forms adjustable swash angle in the test section inner chamber that makes swash plate and roof, left side board and right side board form, when experimental air current blows, just can produce the oblique shock wave at different swash angles through the turned position of adjustment swash plate. With the advancement of the test progress, the change of the shock wave angle can be continuously controlled by controlling the driving mechanism, so that the continuous change of the rear air flow Mach number is realized; on the other hand, when the position of the shock wave plate is dynamically adjusted, the model turntable mechanisms are connected into a whole through the first connecting plate, the position adjustment of the shock wave plate synchronously drives the position adjustment of the model turntable mechanisms, an attack angle mechanism does not need to be additionally arranged at the moment, the integration of the angle of a test model installed on the model turntable and the angle of the shock wave plate adjustment is realized, and the accuracy of wind tunnel test data is improved; meanwhile, the process of adjusting the Mach number after the wave by adopting the shock plate mechanism is simple and practical, and compared with the replacement of a spray pipe, the maintenance workload of aerodynamic test equipment can be obviously reduced.
In another embodiment, shown in figure 6,
the upper surface and/or the side surface of the first connection plate 61 is provided with more than two first connection holes;
the turntable support 62 is of a hollow structure and comprises two turntable support side plates, and the turntable support side plates are provided with more than two second connecting holes on the plate surfaces at different heights;
more than one third connecting hole is arranged on the model turntable 16;
the other end of the first connecting plate 61 is screwed with the turntable support 62 through a first connecting hole and a second connecting hole; the model dial 16 and the dial support 62 are screwed together through the third coupling hole and the second coupling hole.
Specifically, the first connecting plate 61 in this embodiment may be a trapezoidal steel plate, the steel plate is vertically installed between the shock plate 11 and the turntable support 62, and one end of the steel plate may be fixedly connected to the bottom surface and/or the vertical side surface of the shock plate 11 by welding; the steel sheet sets up first connecting hole in the other end that is close to carousel support 62 and is used for cooperating the second connecting hole on the carousel support curb plate.
In other alternative embodiments, as shown in fig. 6, the first connecting plate 61 may also be a long rib plate, the other end of the long rib plate extends to the bottom surface of the shock plate 11 and is welded with the bottom surface of the shock plate 11, and the long rib plate may extend to the vicinity of the shock axis 53 of the shock plate 11 and be flexibly adjusted according to specific needs. The welding length of the long rib plate on the bottom surface of the shock plate 11 is increased to meet the requirements of stress strength and rigidity required by the long rib plate in the wind tunnel test process, so that the stability of the model turntable 16 in the synchronous motion process is ensured; after the long rib plates are welded on the bottom surface of the shock plate 11, the shock plate 11 can be reinforced to adapt to the influence of test airflow with larger Mach number.
Fig. 6 and 7 show an alternative structure of the turntable support 62, which may be a T-shaped hollow structure, and the turntable support 62 has two arc-shaped side plates, and 4 rows of mounting holes are respectively arranged on the two side plates in parallel and in pairs. The mounting holes can be used for fixing the model turntable 16 and also can be used for fixing long rib plates, and at the moment, two long rib plates can be selected and are respectively connected with the side plates on two sides of the turntable support 62 and the shock wave plate 11. The model turntable 16 is a device for installing a test model for a wind tunnel test, two rows of mounting holes can be formed in the model turntable 16, the mounting holes in different positions on the turntable support 62 can be correspondingly selected for mounting, so that test models with different test angles or different test heights can be obtained, and different mounting holes can be selected for adjustment through the pin screw 63 and the hexagon nut 64 according to specific actual needs. For example, the mounting holes with different vertical heights on the turntable support 62 are selected to be connected with the model turntable 16, so that the test angle of the test model on the model turntable 16 can be adjusted; the mounting holes which are positioned on the same horizontal plane and have different vertical heights on the rotary table support 62 are connected with the model rotary table 16, so that the test height of the test model on the model rotary table 16 can be adjusted. On the other hand, as shown in fig. 7, more than one mounting hole with different horizontal positions is provided on the upper surface or the side surface of the part of the long rib plate close to the turntable support 62, the part of the long rib plate can be a frame-shaped structure supported on the upper surface and the side surface, the horizontal position of the test model on the model turntable 16 can be adjusted by selecting the mounting holes with different positions on the long rib plate for mounting the turntable support 62, and the embodiment in fig. 7 is that the mounting holes on the upper surface of the long rib plate are screwed with the turntable support 62. Through the mounted position of control carousel support 62 on long rib to and the mounted position of model carousel 16 on carousel support 62, the horizontal position, vertical height and the experimental angle of regulation test model that can be nimble to adapt to the experimental demand of multiple difference.
Optionally, as shown in fig. 8, there are two sets of shock shaft assemblies 15, the left side plate 3 and the right side plate 4 are respectively provided with a first circular hole, two sides of the shock plate 11 are provided with a second circular hole, and one set of shock shaft assemblies 15 is mounted to the first circular hole on the left side plate 3 and the second circular hole on the left side of the shock plate 11; another set of shock shaft assemblies 15 is mounted to the first circular hole on the right side plate 4 and the second circular hole on the right side of the shock plate 11.
Each set of shock shaft assembly 15 comprises a shock shaft 53, a baffle plate 54, a shaft sleeve 55, a shock shaft bearing 56 and a first round nut 57;
one end of the shock shaft 53 is mounted into the first circular hole; the shock wave shaft bearing 56 is positioned in the first round hole, and the inner ring of the shock wave shaft bearing 56 is sleeved on the shock wave shaft 53; a shaft sleeve 55 is mounted on the shock shaft 53 for adjusting the relative position of the shock shaft bearing 56 on the shock shaft 53; a first round nut 57 is mounted on the outer side of the shaft sleeve 55 for axially pressing the shaft sleeve 55;
the other end of the shock shaft 53 is fitted into a second circular hole adjacent to the first circular hole, and the baffle 54 axially fastens the other end of the shock shaft 53.
Specifically, the left shock shaft assembly 15 is installed in a first circular hole of the left side plate 3 and a second circular hole of the shock plate 11, which is close to the left side plate 3, and the right shock shaft assembly 15 is installed in a first circular hole of the right side plate 4 and a second circular hole of the shock plate 11, which is close to the right side plate 4. Through the shock wave shaft assembly 15, the shock wave plate 11 can be ensured to rotate around the shock wave shaft 53 stably.
Alternatively, as shown in fig. 9, the driving mechanism 13 includes a motor reducer module 41, a lead screw module, a chassis 38, a stay 12, a first hinge assembly 14, and a second hinge assembly 65;
the motor reducer module 41 is connected with the screw module to drive the screw module to horizontally reciprocate on the bottom frame 38;
a first hinge assembly 14 is arranged at one end of the screw rod module close to the motor reducer module 41, the bottom end of the stay bar 12 is hinged with the screw rod module through the first hinge assembly 14, and the top end of the stay bar 12 is hinged with the rear end of the shock plate 11 through a second hinge assembly 65;
when the lead screw module moves back and forth horizontally on the base frame 38, the relative position and horizontal included angle of the bottom end of the stay bar 12 in the horizontal direction are adjusted through the first hinge assembly 14, and then the rotation of the shock plate 11 around the shock shaft 53 is controlled through the top end of the stay bar 12 and the second hinge assembly 65, so that the shock angle of oblique shock waves is continuously adjusted.
Optionally, a second binaural panel configuration is provided at the other end of the shock plate 11, i.e., the rear end of the shock plate 11 proximate the turntable support 62, for mounting a second hinge assembly 65. The hinge connected by the double-lug plate structure is more suitable for ensuring the connection strength of the hinge under heavy load conditions.
In order to change the horizontal included angle of the laser plate 11 more smoothly and ensure the consistency of the laser angle generated by the laser plate 11 in the width direction of the whole test section core, two sets of stay bars 12, a first hinge assembly 14 and a second hinge assembly 65 may be adopted, the bottom ends of the two sets of stay bars 12 are respectively hinged to the two sides of the lead screw module through the first hinge assembly 14, and the top end of the stay bar 12 is hinged to the rear end of the laser plate 11 through the second hinge assembly 65.
Specifically, the motor reducer module 41 is a power source for pushing the lead screw module to move, the lead screw 46 converts the rotary motion output by the motor reducer module 41 into linear motion to drive the bottom end of the connection between the stay bar 12 and the first hinge assembly 14 to reciprocate in the horizontal direction, the top end of the stay bar 12 is connected with the shock plate 11 through the second hinge assembly 65, and when the position and the horizontal included angle of the bottom end of the stay bar 12 change, the top end of the stay bar 12 immediately pushes the shock plate 11 to rotate around the shock shaft 53, so that the shock angle is adjusted.
As an alternative embodiment, as shown in fig. 9 and 10, the driving mechanism 13 further includes a coupling 44, a spacer 45, a front end plate 40, and a rear end plate 39; the screw module comprises a screw 46, a screw bearing 47, a linear guide rail 48, a screw pressure plate 42 and a lantern ring 43;
the motor reducer module 41 is fixedly connected to the front end plate 40; the coupling 44 connects the output shaft of the motor reducer module 41 and the lead screw 46;
two sets of screw bearings 47 are respectively mounted to both ends of the screw 46; and are fixedly connected with the front end plate 40 and the rear end plate 39 respectively;
a spacer 45 is mounted at one end of the screw 46 connected with the coupler 44 and used for adjusting the position of the screw bearing 47;
the underframe 38 is of a groove-shaped structure, two ends of the underframe 38 are respectively connected with the front end plate 40 and the rear end plate 39, and screw holes are formed in two sides of the inner wall of the underframe 38 and used for connecting a linear guide rail 48;
the front end plate 40 is mounted at one end of the bottom frame 38 close to the spacer 45, and a round hole is formed in the middle of the front end plate 40 and used for mounting a screw rod bearing 47;
the rear end plate 39 is mounted to the other end of the bottom frame 38 away from the spacer 45, and a round hole is formed in the middle of the rear end plate 39 and used for mounting a screw bearing 47;
the lead screws 46 are mounted into circular holes of the connecting beam 37, the front end plate 40 and the rear end plate 39;
a screw rod 46 mounting round hole is formed in the middle of the connecting beam 37 to mount the screw rod 46, and the end face, close to the front end plate 40, of the connecting beam 37 is connected with the first hinge assembly 14;
a screw presser plate 42 is mounted to the rear end plate 39 for pressing a screw bearing 47;
two sets of linear guide rails 48 are respectively mounted on two sides of the inner wall of the underframe 38, and the slide blocks of the linear guide rails 48 are mounted on the connecting beams 37.
Optionally, the chassis 38 serves as a carrier for the lead screw module to perform horizontal reciprocating motion, and a U-shaped welding structural member may be selected.
Optionally, a first double-lug plate structure is arranged on the end face of the connecting beam 37 close to the front end plate 40, and is used for installing the first hinge assembly 14, and the hinge connected through the double-lug plate structure is more suitable for ensuring the connection strength of the hinge under heavy load conditions.
Since the motor reducer module 41 outputs a spiral rotation to the screw 46, in order to ensure the stability of the reciprocating horizontal movement of the connecting beam 37 connected to the screw 46 and to limit the rotation tendency of the connecting beam 37 caused by the rotation of the screw 46, the linear guide rail 48 and the slider 66 are introduced to ensure the stable operation of the connecting beam 37 in the horizontal direction.
Optionally, in order to improve the stability of the driving mechanism 13 during operation, a front connecting leg 58 and a rear connecting leg 59 are further provided on the driving mechanism 13, the front connecting leg 58 may be two pieces, and respectively connect the driving mechanism 13 with the left side plate 3 or the right side plate 4, and the connection position may be in the region of the section from the coupler 44 to the front end plate 40; the rear connecting leg 59 may be two pieces, and connects the driving mechanism 13 to the left side plate 3 or the right side plate 4, respectively, and the connecting position may be an area near the rear end plate 39.
Further, taking the second hinge assembly 65 as an example, as shown in fig. 11, the hinge module used in the present embodiment includes a hinge shaft 49, a hinge shaft bearing 50, a second round nut 51, and a hinge shaft bearing cap 52;
the stay bar 12 is mounted on a hinge shaft 49, and hinge shaft bearings 50 are mounted at two ends of the hinge shaft 49;
the hinge shaft bearing 50 is connected with the shock wave plate 11 through a second double-lug plate structure;
the second round nut 51 is used for axially fastening the inner ring of the hinge shaft bearing 50 on the hinge shaft 49;
the hinge bearing cap 52 serves for axial fastening of the outer ring of the hinge bearing 50.
Optionally, as shown in fig. 12, the wind tunnel test section inner core further includes a second connecting plate 5 and a lifting mechanism 8;
more than two sets of second connecting plates 5 are arranged above the top plate 2, and each set of second connecting plates 5 is fixedly connected with the left side plate 3 and the right side plate 4 respectively;
hoist mechanism 8 is more than two sets, installs respectively to apart from 1 second connecting plate 5 of distance farthest on to the flange to connect roof 2, hoist mechanism 8 includes: the device comprises a connecting seat 22, a bidirectional thrust bearing 30, a bearing pressure plate 23, a screw 24, an outer cylinder 25, a lifting shaft 26, a guide flat key 60, a pulling plate 27, a base 28 and a pin shaft 29;
the connecting seat 22 is used for connecting the lifting mechanism 8 and the second connecting plate 5;
the bidirectional thrust bearing 30 is arranged in the connecting seat 22;
a bearing pressure plate 23 is mounted on the connecting seat 22 for axial fastening of the bidirectional thrust bearing 30;
the screw 24 is arranged on the bidirectional thrust bearing 30, and the upper end head of the screw 24 is fastened by a nut;
the lifting shaft 26 is fixedly connected with the screw 24, and a guide flat key 60 is arranged on the outer surface of the lifting shaft 26;
the outer cylinder 25 is fixedly connected with the connecting seat 22, and a sliding key groove is formed in the outer cylinder 25; so that the guide flat key 60 slides in the slide key groove;
one end of the base 28 is fixedly connected with the top plate 2, and the other end of the base 28 is provided with a pin hole;
one end of the lifting shaft 26 close to the top plate 2 is provided with a pin hole, and two ends of the pulling plate 27 are provided with pin holes;
the pin shafts 29 are respectively inserted through the pin holes to connect the lifting shaft 26, the pulling plate 27 and the base 28.
Specifically, the lifting mechanism 8 connects the top plate 2 and the second connecting plate 5, and the position of the top plate 2 can be finely adjusted. The process of fine tuning may be: the screw 24 is rotated by a wrench tool, the screw 24 rotates, the lifting shaft 26 in threaded connection with the screw 24 moves up and down along the inner ring of the outer cylinder 25 under the action of the guiding flat key 60, and then the base 28 is pulled to drive the top plate 2 to move up and down through the transmission of the pin shaft 29 and the pulling plate 27. Roof 2 front end and flange 1 are connected, and the rear end is connected with base 28, and flange 1 is fixed, and the front end of roof 2 of being connected with flange 1 is also fixed, and the rear end of roof 2 does not be in the same place with left side board 3 and right side board 4 are fixed, consequently drives reciprocating of base 28 through hoist mechanism 8, and the rear end of roof 2 can be at corresponding removal certain distance to form certain lift angle, with the experimental requirement of satisfying the different grade type.
As an alternative embodiment, as shown in fig. 13, the wind tunnel test section core is provided with at least one set of first observation window mechanisms 10 on the left side plate 3 and/or the right side plate 4, respectively, and the first observation window mechanisms 10 include: a first window frame 34, an inner ring 35 and a first compression ring 36;
the first sash 34 is mounted to the left side panel 3 or the right side panel 4;
the inner ring 35 is fitted into the first sash 34;
the first press ring 36 is disposed in the first window frame 34 and fixedly connected to the first window frame 34 to press the inner ring 35.
Further, a second observation window mechanism 9 is also included; the second observation window mechanism 9 is arranged on the top plate 2 or the inner ring 35 of the first observation window mechanism 10; the second observation window includes: a second window frame 31, a second press ring 32, and glass 33;
the second sash 31 is mounted to the roof panel 2, or the inner ring 35 of the first observation window mechanism 10;
the second press ring 32 is fixedly connected with the second window frame 31 to press the glass 33;
the glass 33 is installed into the second sash 31.
Specifically, the first observation window mechanism 10 may be a large observation window, may be provided in the left side plate 3 or the right side plate 4 of the test section core, and the second observation window mechanism 9 may be a small observation window, may be provided on the top plate 2 (as shown in fig. 14), or may be mounted on the inner ring 35 of the large observation window (as shown in fig. 13). The large observation window and the small observation window are devices for providing test conditions for a tester to observe a test model, each large observation window is provided with the small observation window, the position of the small observation window in the large observation window is adjustable, and the test conditions in the test section core can be observed through the small observation window. In the observation window, the window frame is main bearing spare, and the inner wall end on second window frame 31 has arranged the closed angle structure, can choose for use cyclic annular closed angle, and is corresponding, and the tip of the glass 33 of installation is equipped with the chamfer in second window frame 31, and the chamfer of glass 33 and the closed angle of second window frame 31 closely laminate, guarantee the level and smooth and joint strength of the terminal surface of little observation window.
As an alternative embodiment, as shown in fig. 15, the wind tunnel test section inner core further includes more than two sets of wheel mechanisms 7, and the wheel mechanisms 7 are mounted to the bottom of the left side plate 3 or the right side plate 4; the wheel mechanism 7 includes: a wheel mount 17, a wheel bearing 21, a wheel shaft 19, a wheel 20 and a wheel bearing cover 18;
the wheel seat 17 is fixedly connected with the left side plate 3 or the right side plate 4;
the wheel bearing 21 is mounted to the wheel mount 17;
the wheel shaft 19 is mounted to a wheel bearing 21;
the wheel 20 is mounted to the wheel shaft 19;
the wheel bearing cover 18 is fixedly connected to the wheel carrier 17 for axially fixing the wheel bearing 21.
The wheel mechanism 7 is used for pushing the inner core of the test section into or out of the special test section of the wind tunnel along a preset track, the preferable number is 4, and the wheel mechanisms are respectively positioned at two ends of the bottom of the left side plate 3 and the bottom of the right side plate 4 of the inner core of the test section. The wheel 20 assembly is a main force bearing part of the inner core of the test section, the inner core of the test section is in place, and after the flange 1 is tightly attached to the connecting surface of the special test section, the connecting screw on the flange 1 is fastened, so that the inner core of the test section can be fixed in the specific test section; after the wind tunnel test is finished, the connection between the flange 1 and the special test section is released, and the inner core of the test section is pushed out, so that preparation work such as test model replacement, test section inner core maintenance and the like is carried out.
Based on the same principle of the above embodiments, in yet another embodiment, a wind tunnel device is further provided, wherein the wind tunnel device adopts any one of the wind tunnel test section inner cores with adjustable mach numbers.
The test section inner core in the embodiment can be applied to a subsonic wind tunnel, a transonic wind tunnel and an supersonic wind tunnel, the Mach number of airflow in a special test section can be flexibly adjusted within the range of 0.4-4.5 in the test process, and the specific operation flow of the wind tunnel device using the test section inner core in the embodiment during the test is as follows:
the lifting mechanism 8 is first adjusted to bring the top panel 2 into a particular position: the screw 24 is screwed and rotated by a wrench tool, the screw 24 rotates, the lifting shaft 26 in threaded connection with the screw 24 moves up and down in the inner ring of the outer cylinder 25 under the action of the guide flat key 60, and then the rear end of the top plate 2 is driven to move up and down in a certain range through the transmission of the pin shaft 29 and the pulling plate 27 and the base 28 connecting the top plate 2 and the pulling plate 27. The front end of the top plate 2 is connected with the flange 1, the flange 1 is fixed, and the rear end of the top plate 2 can correspondingly move for a certain distance, so that a lifting angle required by a certain test is formed.
Next, adjusting the mounting position of the test model, arranging two rows of mounting holes on the model turntable 16, selecting holes at specific positions of a series of mounting holes which are arranged in parallel and in pairs on a side plate of the turntable support 62, and connecting the holes through a pin screw 63 and a hexagonal nut 64 to obtain test models with different test angles or different test heights; meanwhile, the upper surface or the side surface of the rear end of the first connection plate 61 is also provided with a row of mounting holes, so that the horizontal mounting position or the vertical mounting position of the turntable support 62 can be adjusted. According to the current test requirement, the specific installation positions of the turntable support 62 and the model turntable 16 are determined for installation, and then the test model is installed on the model turntable 16.
And then, installing the inner core of the test section in a special test section of the wind tunnel, pushing the inner core of the test section into the special test section along a preset track, fastening a connecting screw after the flange 1 is tightly attached to the connecting surface of the special test section, and fixing the inner core of the test section in the specific test section.
Finally, when the wind tunnel test line starts to work, the initial position of the shock wave plate 11 is in a horizontal state, the horizontal included angle and the horizontal position of the support rod 12 can be changed through the driving mechanism 13, so that the shock wave plate 11 rotates around the shock wave shaft assembly 15, a certain shock wave angle is generated in an inner cavity formed by the shock wave plate 11, the top plate 2, the left side plate 3 and the right side plate 4, and oblique shock waves with different shock wave angles can be generated when test airflow blows. With the advancement of the test progress, the change of the shock wave angle can be continuously controlled by controlling the driving mechanism 13, so that the continuous change of the rear air flow Mach number is realized, and continuous variable Mach wind tunnel test data can be obtained in one test process. In the process of adjusting the angle of the shock wave plate 11, the model turntable mechanism is connected into a whole by the first connecting plate 61, and the position adjustment of the model turntable mechanism is synchronously driven by the position adjustment of the shock wave plate 11, so that an attack angle mechanism is not required to be additionally arranged on the wind tunnel device using the test section inner core, the integration of the angle of the test model installed on the model turntable 16 and the angle adjusted by the shock wave plate 11 is realized, and the accuracy of wind tunnel test data is improved.
In general, the wind tunnel device using the test section inner core provided by the invention has the advantages that the driving mechanism drives the shock plate to rotate, so that the Mach number in the primary test process can be continuously adjusted, the workload of workers in the process of replacing the spray pipe is saved, the working efficiency is improved, and the equipment maintenance workload is obviously reduced; meanwhile, the position and the angle of the test model are synchronously adjusted through the first connecting plate while the shock plate rotates, an additional attack angle mechanism is saved for the wind tunnel, the integration of the angle of the test model and the angle adjustment of the shock plate is realized, and the wind tunnel test data with higher precision can be obtained.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a wind tunnel test section inner core with adjustable Mach number, which drives a shock wave plate to rotate through a driving mechanism, so that an adjustable shock wave angle is formed in a test section inner cavity formed by the shock wave plate, a top plate, a left side plate and a right side plate, and oblique shock waves with different shock wave angles can be generated by adjusting the rotating position of the shock wave plate when test airflow blows. With the progress of the test, the change of the shock wave angle can be continuously controlled by controlling the driving mechanism, so that the continuous change of the Mach number after the wave is generated; on the other hand, when the position of the shock wave plate is dynamically adjusted, the model turntable mechanism is connected into a whole through the first connecting plate, the position adjustment of the shock wave plate synchronously drives the position adjustment of the model turntable mechanism, an attack angle mechanism does not need to be additionally arranged at the moment, the integration of the angle of the test model installed on the model turntable and the angle adjusted by the shock wave plate is realized, and the accuracy of wind tunnel test data is improved.
Furthermore, more than two mounting holes are respectively arranged on two side plates of the turntable support in parallel in pairs. These mounting holes can be used for fixing both the model carousel and the first connecting plate. Two rows of mounting holes are formed in the model turntable, and mounting holes in different positions on the turntable support can be correspondingly selected for mounting so as to obtain test models with different test angles or different test heights; on the other hand, more than two mounting holes with different horizontal positions are arranged on the upper surface or the side surface of the first connecting plate, and the horizontal position of the test model on the model turntable can be adjusted by selecting the mounting holes with different positions on the first connecting plate to mount the turntable support. Through the mounted position of control carousel support on first connecting plate to and the mounted position of model carousel on the carousel support, horizontal position, vertical height and the experimental angle of regulation test model that can be nimble, in order to adapt to the experimental demand of multiple difference.
The invention also provides a wind tunnel device, and by applying the wind tunnel test section inner core with the adjustable Mach number, the workload of workers in the process of replacing the spray pipe is saved, the working efficiency is improved, and the equipment maintenance workload is obviously reduced; meanwhile, the position and the angle of the test model are synchronously adjusted through the first connecting plate while the shock plate rotates, an additional attack angle mechanism is saved for the wind tunnel, the integration of the angle of the test model and the angle adjustment of the shock plate is realized, and the wind tunnel test data with higher precision can be obtained.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A wind tunnel test section inner core with continuously adjustable Mach number is characterized by comprising a top plate, a left side plate, a right side plate, a flange, a model turntable mechanism, a shock plate mechanism and a driving mechanism;
the shock wave plate mechanism comprises a shock wave plate, the top plate, the left side plate and the right side plate form a hollow cavity, the hollow cavity is provided with a front end and a rear end, and the flange is arranged at the front end of the hollow cavity;
the front end of the shock wave plate close to the flange is connected between the left side plate and the right side plate through a shock wave shaft assembly rotating shaft, the rear end of the shock wave plate far away from the flange is connected with the driving mechanism, and the driving mechanism drives the shock wave plate to rotate around the shock wave shaft assembly;
the model turntable mechanism comprises a turntable support, a model turntable and a first connecting plate, wherein one end of the first connecting plate is fixedly connected with the rear end of the laser plate, and the other end of the first connecting plate is fixedly connected with the turntable support; the turntable support is used for mounting a model turntable; wherein the first connecting plate is a long rib plate; the upper surface and/or the side surface of the first connecting plate are/is provided with more than two first connecting holes; the turntable support is of a hollow structure and comprises two turntable support side plates, and the turntable support side plates are provided with more than two second connecting holes on the plate surfaces at different heights; more than one third connecting hole is formed in the model turntable; the other end of the first connecting plate is in screwed connection with the turntable support through the first connecting hole and the second connecting hole; the model turntable and the turntable support are in screwed connection through the third connecting hole and the second connecting hole;
the inner core of the wind tunnel test section is fixedly connected to the test section of the wind tunnel through the flange, and when test airflow blows, the driving mechanism drives the shock wave plate to rotate around the shock wave shaft assembly, so that the shock wave plate generates oblique shock waves with continuously variable shock wave angles in the hollow cavity, and continuous change of wave-rear Mach number is controlled; the laser plate synchronously drives the turntable support in the rotating process so as to realize the synchronous adjustment of the position of the model turntable.
2. The wind tunnel test section inner core according to claim 1, wherein the number of the shock wave shaft assemblies is two, the left side plate and the right side plate are respectively provided with a first round hole, two sides of the shock wave plate are provided with a second round hole, and one set of the shock wave shaft assemblies is mounted to the first round hole on the left side plate and the second round hole on the left side of the shock wave plate; another set of the shock shaft assembly is mounted to the first round hole on the right side plate and the second round hole on the right side of the shock plate;
each set of the shock shaft assembly comprises a shock shaft, a baffle plate, a shaft sleeve, a shock shaft bearing and a first round nut;
one end of the shock wave shaft is arranged in the first round hole; the shock wave shaft bearing is positioned in the first round hole, and an inner ring of the shock wave shaft bearing is sleeved on the shock wave shaft; the shaft sleeve is arranged on the shock wave shaft and used for adjusting the relative position of the shock wave shaft bearing on the shock wave shaft; the round nut is arranged on the outer side of the shaft sleeve and used for axially pressing the shaft sleeve;
the other end of the shock wave shaft is installed in the second round hole adjacent to the first round hole, and the baffle plate axially fastens the other end of the shock wave shaft.
3. The wind tunnel test section core of claim 1, wherein the drive mechanism comprises a motor reducer module, a lead screw module, a chassis, a strut, a first hinge assembly, a second hinge assembly;
the motor reducer module is connected with the lead screw module so as to drive the lead screw module to horizontally reciprocate on the underframe;
a first hinge assembly is arranged at one end, close to the motor reducer module, of the screw rod module, the bottom end of the support rod is hinged to the screw rod module through the first hinge assembly, and the top end of the support rod is hinged to the rear end of the laser plate through the second hinge assembly;
when the screw module horizontally reciprocates on the underframe, the relative position and the horizontal included angle of the bottom end of the stay bar in the horizontal direction are adjusted through the first hinge assembly, and then the rotation of the shock plate around a shock shaft is controlled through the top end of the stay bar and the second hinge assembly, so that the shock angle of oblique shock waves is continuously adjusted.
4. The wind tunnel test section inner core according to claim 3, wherein the driving mechanism further comprises a coupling, a spacer bush, a front end plate and a rear end plate; the screw module comprises a screw, a screw bearing, a linear guide rail, a screw pressing plate and a sleeve ring;
the motor reducer module is fixedly connected to the front end plate; the shaft coupling is connected with an output shaft of the motor reducer module and the lead screw;
the two sets of screw rod bearings are respectively arranged at two ends of the screw rod; and are respectively fixedly connected with the front end plate and the rear end plate;
the spacer bush is arranged at one end of the lead screw connected with the coupler and used for adjusting the position of a lead screw bearing on the lead screw;
the underframe is of a groove-shaped structure, two ends of the underframe are respectively connected with the front end plate and the rear end plate, and screw holes are formed in two sides of the inner wall of the underframe and used for connecting the linear guide rails;
the front end plate is mounted at one end, close to the spacer bush, of the bottom frame, and a round hole is formed in the middle of the front end plate and used for mounting the lead screw bearing;
the rear end plate is mounted to the other end, far away from the spacer bush, of the bottom frame, and a round hole is formed in the middle of the rear end plate and used for mounting the lead screw bearing;
the screw rod is arranged in circular holes of the connecting beam, the front end plate and the rear end plate;
a screw rod mounting round hole is formed in the middle of the connecting beam for mounting a screw rod, and the end face, close to the front end plate, of the connecting beam is connected with the first hinge assembly;
the screw rod pressing plate is mounted to the rear end plate and used for pressing the screw rod bearing;
the lantern ring is mounted to the tail end of the lead screw and used for adjusting the relative position of the lead screw bearing on the tail end of the lead screw;
the two sets of linear guide rails are respectively installed on two sides of the inner wall of the bottom frame, and sliding blocks of the linear guide rails are installed on the connecting beams.
5. The wind tunnel test section core according to claim 1, further comprising a second connecting plate and a lifting mechanism;
the number of the second connecting plates is more than two, the second connecting plates are positioned above the top plate, and each set of the second connecting plates is fixedly connected with the left side plate and the right side plate respectively;
the hoist mechanism is more than two sets, install respectively to apart from the flange distance is the farthest on the second connecting plate, and connect the roof, hoist mechanism includes: the device comprises a connecting seat, a bidirectional thrust bearing, a bearing pressing plate, a screw, an outer cylinder, a lifting shaft, a guide flat key, a pulling plate, a base and a pin shaft;
the connecting seat is used for connecting the lifting mechanism and the second connecting plate;
the bidirectional thrust bearing is arranged in the connecting seat;
the bearing pressing plate is mounted on the connecting seat and used for axially fastening the bidirectional thrust bearing;
the screw is arranged on the bidirectional thrust bearing, and the upper end head of the screw is fastened by a nut;
the lifting shaft is fixedly connected with the screw rod, and the outer surface of the lifting shaft is provided with the guide flat key;
the outer cylinder is fixedly connected with the connecting seat, and a sliding key groove is formed in the outer cylinder; so that the guide flat key slides in the sliding key groove;
one end of the base is fixedly connected with the top plate, and the other end of the base is provided with a pin hole;
a pin hole is formed in one end, close to the top plate, of the lifting shaft, and pin holes are formed in two ends of the pulling plate;
the pin shaft penetrates through the pin holes respectively to connect the lifting shaft, the pulling plate and the base.
6. The wind tunnel test section inner core according to claim 1, wherein at least one set of first observation window mechanism is respectively arranged on the left side plate and/or the right side plate, and the first observation window mechanism comprises: the first window frame, the inner ring and the first pressure ring;
the first window frame is mounted to the left side panel or the right side panel;
the inner ring is mounted into the first window frame;
the first press ring is arranged in the first window frame and fixedly connected with the first window frame so as to press the inner ring.
7. The wind tunnel test section core of claim 6 further comprising a second viewing window mechanism; the second observation window mechanism is arranged on the top plate or the inner ring of the first observation window mechanism; the second observation window includes: the second window frame, the second pressure ring and the glass;
the second window frame is mounted to the top panel, or the inner ring of the first sight glass mechanism;
the second pressing ring is fixedly connected with the second window frame so as to press the glass;
the glass is mounted into the second sash.
8. The wind tunnel test section core of claim 1, further comprising more than two sets of wheel mechanisms, said wheel mechanisms being mounted to the bottom of said left side plate and said right side plate; the wheel mechanism includes: a wheel mount, a wheel bearing, a wheel axle, a wheel, and a wheel bearing cap;
the wheel seat is fixedly connected with the left side plate or the right side plate;
the wheel bearing is mounted to the wheel mount;
the wheel shaft is mounted to the wheel bearing;
the wheel is mounted to the wheel axle;
the wheel bearing cover is fixedly connected with the wheel seat and used for axially fixing the wheel bearing.
9. A wind tunnel device, characterized by comprising a wind tunnel test section inner core with continuously adjustable Mach number according to any one of claims 1-8.
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| CN114235325A (en) * | 2021-11-19 | 2022-03-25 | 中国航天空气动力技术研究院 | Shock plate control system and method for wind tunnel continuous variable Mach number test |
| CN115326346B (en) * | 2022-10-18 | 2023-01-24 | 中国航空工业集团公司哈尔滨空气动力研究所 | Easily-adjusted convertible side wall structure for closed test section |
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