A pulley assembly for a closed wind tunnel test model suspension support device, a wind tunnel test model support device and a wind tunnel test device

Abstract

The application discloses a pulley assembly of a support device for a closed wind tunnel test model, a support device for a wind tunnel test model and a wind tunnel test device, wherein the pulley assembly comprises a sleeve adapted to penetrate a wall of a wind tunnel and provided with a channel for a rope to pass through, the channel extending along a first direction; two pulley assemblies are respectively installed at two ends of the sleeve; each pulley assembly comprises a support and a pulley rotatably connected to the support; the pulley is used for supporting the rope and guiding the rope to change direction; the two supports rotate around a first rotation axis extending along the first direction, and the first rotation axis is located in the channel; the pulleys of the two pulley assemblies and the first rotation axis are configured such that the rope located between the two pulley assemblies is always tensioned in the channel by the pulleys and does not contact the sleeve. The pulley assembly can be used to suspend and support an aircraft model by using a rope when a wind tunnel test of the aircraft model is performed by using a closed wind tunnel.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing technology, specifically to a pulley assembly for a suspension support device of a closed wind tunnel test model, a support device for a wind tunnel test model, and a wind tunnel testing device. Background Technology

[0002] The closed wind tunnel involved in this invention has a sump chamber in its test section, and the upper and lower walls of the wind tunnel test section have parallel, downstream-oriented oblique holes. The rope-based test model suspension support utilizes these oblique holes to arrange pulleys, guiding the traction rope from inside the wind tunnel outwards to the sump chamber for rope installation, thereby suspending the model within the wind tunnel test section. This test model suspension support allows for the simulation of various flight states of an aircraft by controlling the aircraft model's attitude or motion within the wind tunnel, measuring the model's key aerodynamic parameters, and predicting the aircraft's aerodynamic performance. This provides a necessary technical foundation for flight control law verification, flight quality assessment, and flight dynamics research.

[0003] Existing wind tunnel tests require the use of support devices to adjust the attitude of aircraft models. For example, Chinese patent CN114778064A provides a support device that uses components such as traction ropes and universal pulleys to adjust the attitude of an aircraft model. This support device can conveniently, quickly, and accurately adjust the attitude of the aircraft model and reduce the impact of the support device on the wind tunnel test results. However, this type of support device is more convenient when used in open wind tunnels, where pulleys can be mounted on a frame composed of rods and used in conjunction with traction ropes to suspend and support the aircraft model in the wind tunnel test section. However, when testing in a closed wind tunnel with a sump chamber, the pulleys used to guide the traction ropes must be installed on the inner wall of the wind tunnel to extend the traction ropes to the sump chamber outside the wind tunnel test section without damaging the surface of the wind tunnel inner wall, and the traction ropes must not interfere with the inclined holes. Therefore, it is difficult to install pulleys directly on the inner wall of the wind tunnel. The present invention aims to solve this problem. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned defects or problems in the prior art and to provide a pulley assembly for a closed wind tunnel test model suspension support device, a support device for a wind tunnel test model, and a wind tunnel test device. This pulley assembly enables the use of ropes to suspend and support the aircraft model when conducting wind tunnel tests on an aircraft model in a closed wind tunnel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pulley assembly for a suspension support device of a closed wind tunnel test model, adapted to be installed on the wind tunnel wall and used to support a rope for suspending and supporting an aircraft model undergoing wind tunnel testing, the pulley assembly comprising: a sleeve adapted to penetrate the wind tunnel wall and having a channel for the rope to pass through, the channel extending along a first direction; two pulley sets, each mounted at one end of the sleeve; each pulley set including a bracket and a pulley rotatably connected to the bracket; the pulleys supporting the rope and guiding the rope to change direction; both brackets rotating about a first rotation axis extending along the first direction, the first rotation axis being located within the channel; the pulleys of the two pulley sets and the first rotation axis being configured such that the rope located between the two pulley sets is always tensioned by the pulleys within the channel and does not interfere with the sleeve.

[0007] Furthermore, each pulley is provided with a groove for the rope to be wound around; when the rope is wound around the groove, the part that contacts the groove forms a contact portion, and the contact portion corresponds to each pulley and has an entry end and an exit end. The rope starts to connect with the pulley from the entry end and starts to separate from the pulley from the exit end; the line connecting the nearest exit end of the rope before entering the channel and the nearest entry end of the rope after leaving the channel is always located in the channel and does not intersect with the sleeve, so that the rope is always located in the channel and does not interfere with the sleeve.

[0008] Furthermore, the inner wall of the sleeve has a rotationally symmetrical structure with the first rotation axis as the axis of symmetry; the position of the groove on the pulley closest to the channel on the pulley assembly corresponds to the first rotation axis, so that the rope is restricted by the pulley and extends along the first rotation axis within the channel.

[0009] Furthermore, each pulley in both pulley groups rotates about its own rotation axis, which is defined as a second rotation axis. Each of the second rotation axes is parallel to each other and perpendicular to the first rotation axis. Each pulley group includes at least two pulleys with grooves on the two pulleys facing each other.

[0010] Furthermore, each of the pulley groups includes two pulleys, the positional relationship of which is configured such that the rope is tensioned by the pulleys during the rotation of the pulley group without interfering with the sleeve, and the pulley group does not interfere with the wind tunnel wall.

[0011] Furthermore, the bracket of the pulley block is mounted on the end of the sleeve via a bearing, and rotates relative to the sleeve about the first rotation axis via the bearing.

[0012] Furthermore, the sleeve includes an inner liner and an outer fixing sleeve; the inner liner penetrates the wind tunnel wall and has the channel; there are two outer fixing sleeves, which are respectively inserted into the inner liner from both ends and fixed to the inner liner, and the two outer fixing sleeves cooperate to clamp the wind tunnel wall to fix the sleeve.

[0013] Furthermore, it also includes reinforcing blocks, at least two in number; the sleeve obliquely penetrates the wind tunnel wall, and the two reinforcing blocks are fixed to the outer wall of the sleeve and located on the inner and outer sides of the wind tunnel wall respectively, and are in close contact with the inner and outer sidewalls of the wind tunnel wall respectively, so as to fix the pulley assembly in the direction of the first rotation axis.

[0014] Furthermore, the present invention also provides a support device for a wind tunnel test model, used for suspending and supporting an aircraft model for wind tunnel testing, characterized in that it includes a pulley assembly, a rope, and a rope traction device as described in any of the above claims for wind tunnel testing; one end of the rope is connected to the rope traction device, and the other end is connected to the aircraft model, and is supported and reversed by the pulley assembly.

[0015] In addition, the present invention also provides a wind tunnel testing device, characterized in that it includes a wind tunnel body formed by being surrounded by wind tunnel walls, and a support device for the wind tunnel testing model.

[0016] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0017] The pulley assembly for wind tunnels provided by this invention includes a sleeve and a pulley system. The sleeve penetrates the wind tunnel wall and is fixed to it. Pulley systems are located at both ends of the sleeve. The pulleys on the pulley systems support and tension a rope. After passing through a channel inside the sleeve, the rope can enter the wind tunnel from outside. The rope is tensioned by the pulleys, and by limiting the size and position of the pulleys, the rope will not touch the sleeve, preventing it from affecting the accuracy of traction when supporting the aircraft model. Simultaneously, the support on the pulley system rotates around a first rotation axis. The rotation of the two pulley systems allows the rope greater freedom, facilitating the adjustment of the aircraft model's attitude. This pulley assembly allows for the support and traction of the aircraft model via rope. The support device can be installed outside the wind tunnel, without affecting the airflow inside, and also prevents the edges of the air outlets on the wind tunnel wall from affecting the precise traction of the aircraft by the rope.

[0018] The inner wall of the sleeve is a rotationally symmetrical structure with the first rotation axis as the axis of symmetry, which facilitates the rotation of the pulley block around the first rotation axis. At the same time, when the pulley block rotates, the movement trajectory of the rope wound on the pulley is predictable, which can prevent the rope from touching the sleeve.

[0019] Each pulley in the pulley block rotates around a second rotation axis, and the second rotation axis is perpendicular to the first rotation axis. This makes it easier for the rope to pass over the pulleys at both ends of the sleeve without making large-angle turns. At the same time, when the pulley block rotates around the first rotation axis, the rope is also in a position that rotates around the first rotation axis, which can prevent the rope from touching the sleeve.

[0020] Setting two pulleys side by side on a pulley block can prevent the rope from detaching from the pulleys and increase the degree of freedom of the rope to turn in the plane perpendicular to the second axis of rotation.

[0021] The pulley block's support is mounted on the sleeve via bearings, allowing the pulley block to rotate relative to the sleeve around the first rotation axis, which increases the degree of freedom for the rope to turn in the plane perpendicular to the first rotation axis.

[0022] The sleeve includes an inner liner and an outer fixing sleeve. There are two outer fixing sleeves, which can clamp the wind tunnel wall to fix the inner liner. The inner liner serves to allow ropes to pass through and to install pulley blocks. This method of installing the sleeve can be done without damaging the wind tunnel wall.

[0023] Reinforcing blocks are installed to increase the support area for the pulley assembly when it is installed on the wind tunnel wall, thereby improving the installation strength of the pulley assembly.

[0024] The wind tunnel test model support device provided by the present invention can conveniently and accurately support and traction the aircraft model through the aforementioned pulley assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments are briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the wind tunnel testing device provided in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A schematic diagram of the pulley assembly.

[0028] Explanation of key figure labels:

[0029] 10 Wind tunnel wall; 11 Wind tunnel cavity; 12 Air outlet; 20 Aircraft model; 30 Pulley assembly; 31 Inner liner; 311 First locking hole; 312 Channel; 32 Outer fixing sleeve; 321 Second locking hole; 33 Bearing seat; 34 Bearing; 35 Bracket; 36 Pulley; 37 Reinforcing block; 40 Rope. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0032] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0033] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0034] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0035] Example

[0036] Reference Figure 1 This invention provides a wind tunnel testing device for conducting simulated flight tests on an aircraft model 20. The device includes a wind tunnel body formed by a wind tunnel wall 10, with a wind tunnel cavity 11 formed within the wind tunnel body. An inclined air outlet 12 is provided on the wind tunnel wall 10, which can guide excess airflow to be discharged outside the wind tunnel, preventing the airflow from forming a boundary layer near the inner wall of the wind tunnel wall 10, thus affecting the accuracy of the wind tunnel test.

[0037] A support device for conducting wind tunnel tests is installed and fixed on the wind tunnel body. This support device suspends and supports the aircraft model 20 for wind tunnel testing. The support device includes a pulley assembly 30, a rope 40, and a rope 40 traction device. One end of the rope 40 is connected to the rope 40 traction device, and the other end is connected to the aircraft model 20. It is supported and reversed by the pulley assembly 30. The rope 40 traction device is generally a motor with a winding pulley. By rotating the motor, the rope 40 is wound up and down, thereby adjusting the position and attitude of the aircraft model 20.

[0038] Reference Figure 1 During wind tunnel testing, the aircraft model 20 is suspended and pulled by the rope 40 of the support device. The aircraft model 20 is located inside the wind tunnel, and the airflow can then blow towards the aircraft model 20.

[0039] The rope 40 traction device is located outside the wind tunnel. For the rope 40 to enter the wind tunnel cavity 11 from outside the wind tunnel, it needs to pass through the pulley assembly 30. The pulley assembly 30 is adapted to be installed on the wind tunnel wall 10 and used to support the rope 40. The rope 40 is used to suspend and support the aircraft model 20 for wind tunnel testing.

[0040] Reference Figure 2 The pulley assembly 30 includes a sleeve, a pulley block, and a reinforcing block 37.

[0041] The sleeve is adapted to penetrate the wind tunnel wall 10 and has a channel 312 for the rope 40 to pass through, the channel 312 extending along a first direction; there are two pulley sets, which are respectively installed at both ends of the sleeve; each pulley set includes a bracket 35 and a pulley 36 rotatably connected to the bracket 35; the pulley 36 is used to support the rope 40 and guide the rope 40 to change direction; both brackets 35 rotate about a first rotation axis extending along the first direction, the first rotation axis is located in the channel 312; the pulleys 36 and the first rotation axis of the two pulley sets are configured such that the rope 40 located between the two pulley sets is always located in the channel 312 and does not contact the sleeve.

[0042] The inner wall of the sleeve is rotationally symmetrical about the first axis of rotation. More specifically, the sleeve includes an inner liner 31 and an outer fixing sleeve 32; the inner liner 31 penetrates the wind tunnel wall 10 and has a channel 312; there are two outer fixing sleeves 32, which are respectively inserted into and fixed to the inner liner 31 from both ends, and the two outer fixing sleeves 32 cooperate to clamp the wind tunnel wall 10 to fix the sleeve. The inner wall of the inner liner 31 forms the inner wall of the sleeve described above, and the outer fixing sleeves 32 are fitted outside the inner liner 31.

[0043] Specifically, the air outlets 12 on the wind tunnel wall 10 are all set at an angle to accommodate... Figure 2The direction of airflow indicated by the arrow is the reference. The tilt direction of the air outlet 12 is from the inside of the wind tunnel to the outside of the wind tunnel along the direction of airflow. The tilt direction of the air outlet 12 defines a first direction. The first direction can be regarded as the direction of the central axis when the air outlet 12 is a circular hole.

[0044] In this embodiment, the pulley assembly 30 requires the sleeve to penetrate the wind tunnel wall 10, which is actually installed using the air outlet 12 on the wind tunnel wall 10. Since the air outlet 12 are densely distributed on the wind tunnel wall 10, only a few of the pulley assemblies 30 need to be installed, which will not affect the normal air output of the wind tunnel.

[0045] Generally, the outer shape of the sleeve is a cylinder that matches the air outlet 12, meaning the inner sleeve 31 is cylindrical with an outer diameter matching the inner diameter of the air outlet 12. This allows the inner sleeve 31 to penetrate the air outlet 12 on the wind tunnel wall 10, with its two ends positioned on the inner and outer sides of the wind tunnel wall 10, respectively. A first locking hole 311 is provided on the inner sleeve 31, and a corresponding second locking hole 321 is provided on the outer fixing sleeve 32. Bolts can be used to fix the inner sleeve 31 and the outer fixing sleeve 32 together.

[0046] When installing the sleeve, first insert the inner liner 31 through the air outlet 12, then fix the outer fixing sleeve 32 onto the inner liner 31. At this time, the two outer fixing sleeves 32 will clamp the wind tunnel wall 10 from the inner and outer sides respectively, thereby fixing the sleeve onto the wind tunnel wall 10. When the sleeve is fixedly installed on the wind tunnel wall 10, the two ends of the channel 312 formed by the sleeve are exposed on both sides of the wind tunnel wall 10.

[0047] The pulley block bracket 35 is mounted to the end of the sleeve via bearings and rotates relative to the sleeve about a first rotation axis via the bearings. For details, refer to... Figure 2 A bearing seat 33 is installed at the end of the outer fixed sleeve 32, and a bearing 34 is installed on the bearing seat 33. The pulley block bracket 35 is installed on the bearing 34. It should be noted that the bracket 35 is installed eccentrically relative to the first rotation axis, so that the bracket 35 can rotate relative to the sleeve around the first rotation axis.

[0048] Reference Figure 2Each pulley 36 is provided with a groove for the rope 40 to be wound around. When the rope 40 is wound around the groove, the part that contacts the groove forms a contact portion. Each pulley 36 has an entry end and an exit end. The rope 40 starts to contact the pulley 36 from the entry end and starts to separate from the pulley 36 from the exit end. The line connecting the nearest exit end of the rope 40 before entering the channel 312 and the nearest entry end of the rope 40 after leaving the channel 312 is always located in the channel 312 and does not intersect with the sleeve, so that the rope 40 is always located in the channel 312 and does not contact the sleeve. The position of the groove on the pulley 36 closest to the channel 312 corresponds to the first axis of rotation, so that the rope 40 is restricted by the pulley 36 and extends along the first axis of rotation within the channel 312.

[0049] In this embodiment, each pulley 36 in both pulley groups rotates around its own rotation axis, which is defined as a second rotation axis. These second rotation axes are parallel to each other and perpendicular to the first rotation axis. Each pulley group includes at least two pulleys 36 with grooves facing each other. In this embodiment, each pulley group includes two pulleys 36, and the positional relationship of these two pulleys 36 is configured such that the rope 40 is tensioned by the pulleys 36 during the rotation of the pulley group without interfering with the sleeve, and the pulley group does not interfere with the wind tunnel wall 10.

[0050] Specifically, refer to Figure 2 Taking one pulley system as an example, the bracket 35 extends along the first direction, and the rotation axes of both pulleys 36 are mounted on the bracket 35, allowing the two pulleys 36 to be arranged side-by-side along the first direction. The second rotation axes corresponding to the two pulleys 36 are perpendicular to the first direction, and thus perpendicular to the first rotation axis. Each pulley 36 has a groove on its circumference for the rope 40 to be wound around, preventing the rope 40 from slipping off. The grooves of the two pulleys 36 in the same pulley system are aligned, meaning that not only are the rotation axes of the two pulleys 36 parallel, but their positions are also aligned. This prevents the rope 40 from twisting or experiencing unsmooth turns when wound around these two pulleys 36. When winding the rope 40, it can be passed between the two pulleys 36, after which the rope 40 can be guided by the pulleys 36 and turned at various angles. See details for further information. Figure 2 The double-dotted line in the middle represents rope 40, which indicates the direction in which rope 40 can be turned.

[0051] Since the position of the rope 40 relative to the sleeve is mainly defined by the position of the pulley 36 closest to the sleeve, the position of the pulley 36 closest to the sleeve should meet the requirements described above, while the position of the pulley 36 farther from the sleeve can be adjusted according to actual needs. In this embodiment, the two pulleys 36 are arranged side by side along the first direction, but in other embodiments, their arrangement direction can form a certain angle with the first direction, as long as this angle does not affect the limitation of the position of the rope 40 by the pulley 36 closest to the sleeve.

[0052] When the rope 40 is tensioned by the pulley system at both ends of the sleeve, the extension direction of the rope 40 within the sleeve coincides with the first rotation axis. This structure can be achieved by selecting and adjusting the size of the pulley 36. In this embodiment, the position of the groove of the pulley 36, which is the part used to wind the rope 40 and define its position, coincides with the first rotation axis, thereby determining the position of the rope 40. When the pulley system rotates relative to the sleeve, the rope 40 will not twist or knot.

[0053] In addition, at least two reinforcing blocks 37 are provided; the sleeve obliquely penetrates the wind tunnel wall 10, and the two reinforcing blocks 37 are fixed to the outer wall of the sleeve and located on the inner and outer sides of the wind tunnel wall 10, respectively, and are in close contact with the inner and outer sidewalls of the wind tunnel wall 10, so as to fix the pulley assembly in the direction of the first rotation axis. (Refer to...) Figure 2 In this embodiment, the reinforcing block 37 is annular with an oblique hole in the center. The size of the oblique hole is the same as the outer diameter of the sleeve, allowing the reinforcing block 37 to be arranged around the outside of the sleeve. Two reinforcing blocks 37 are respectively fixed to the sleeve and located on the inner and outer sides of the wind tunnel wall 10. The reinforcing blocks 37 can be fixed to the sleeve by welding. The reinforcing block 37 located on the inner side of the wind tunnel wall 10 is in close contact with the inner wall of the wind tunnel wall 10, and the reinforcing block 37 located on the outer side of the wind tunnel wall 10 is in close contact with the outer wall of the wind tunnel wall 10, thereby fixing the pulley assembly as a whole in the direction of the first rotation axis. With the reinforcing blocks 37, the position of the pulley assembly will not change under heavy loads, increasing the overall structural stability of the pulley assembly and the reliability after installation.

[0054] To install the pulley assembly 30, first assemble the pulley block, then install the bearing on the outer fixed sleeve 32 of the sleeve. Next, fix the pulley block bracket 35 to the bearing seat 33, which can be done by welding. Then, pass the inner bushing 31 of the sleeve through the air outlet 12, and then fit the two assembled outer fixed sleeves 32 onto the inner bushing 31, securing them with bolts. Under heavy loads, reinforcing blocks 37 can be pre-installed on the sleeve.

[0055] The wind tunnel testing apparatus provided in this embodiment includes a support device for wind tunnel testing. This support device includes a pulley assembly 30, which comprises a sleeve and a pulley system. The sleeve penetrates the wind tunnel wall 10 and is fixed to it. Pulley systems are provided at both ends of the sleeve. Pulleys 36 on the pulley systems support and tension a rope 40. The rope 40 passes through the channel 312 inside the sleeve and enters the wind tunnel from outside. The rope 40 is tensioned by the pulleys 36, and by limiting the size and position of the pulleys 36, the rope 40 is always tensioned and will not touch the sleeve. To prevent the rope 40 from detaching from the pulley or touching the sleeve when supporting the aircraft model 20, thus affecting the accuracy of traction of the aircraft model 20; at the same time, the bracket 35 on the pulley group rotates around the first rotation axis, and the rotation of the two pulley groups can give the rope 40 greater freedom, making it easier for the aircraft model 20 to adjust its attitude; through this pulley assembly 30, the aircraft model 20 can be supported and pulled by the rope 40, and the support device can be installed outside the wind tunnel without affecting the airflow inside the wind tunnel, and can also prevent the edge of the air outlet 12 on the wind tunnel wall 10 from affecting the precise traction of the aircraft by the rope 40.

[0056] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A pulley assembly for a suspension support device for a closed wind tunnel test model, adapted to be mounted to the wind tunnel wall (10) of the wind tunnel and used to support a rope (40) for suspending and supporting an aircraft model (20) undergoing wind tunnel testing, characterized in that it comprises: A sleeve adapted to penetrate the wind tunnel wall (10) and provided with a channel (312) for the rope (40) to pass through, the channel (312) extending in a first direction; Two pulley sets are respectively installed at both ends of the sleeve; each pulley set includes a bracket (35) and a pulley (36) rotatably connected to the bracket (35); the pulley (36) is used to support the rope (40) and guide the rope (40) to change direction; both brackets (35) rotate about a first rotation axis extending in a first direction, the first rotation axis being located within the channel (312); the pulleys (36) of the two pulley sets and the first rotation axis are configured such that the rope (40) located between the two pulley sets is always tensioned by the pulleys (36) in the channel (312) and does not interfere with the sleeve. Each pulley (36) is provided with a groove for the rope (40) to be wound around; when the rope (40) is wound around the groove, the part that contacts the groove forms a contact portion, and the contact portion has an entry end and an exit end corresponding to each pulley (36). The rope (40) starts to connect with the pulley (36) from the entry end and starts to separate from the pulley (36) from the exit end; the line connecting the nearest exit end of the rope (40) before entering the channel (312) and the nearest entry end of the rope (40) after leaving the channel (312) is always located in the channel (312) and does not intersect with the sleeve, so that the rope (40) is always located in the channel (312) and does not interfere with the sleeve.

2. The pulley assembly for a suspension support device of a closed wind tunnel test model as described in claim 1, characterized in that, The inner wall of the sleeve has a rotationally symmetrical structure with the first rotation axis as the axis of symmetry; the position of the groove on the pulley (36) closest to the channel (312) on the pulley group corresponds to the first rotation axis, so that the rope (40) is restricted by the pulley (36) and extends along the first rotation axis in the channel (312).

3. The pulley assembly for a suspension support device of a closed wind tunnel test model as described in claim 1, characterized in that, Each pulley (36) in both pulley groups rotates about its own rotation axis, which is defined as a second rotation axis. Each second rotation axis is parallel to each other and perpendicular to the first rotation axis. Each pulley group includes at least two pulleys (36) with grooves on the two pulleys (36) facing each other.

4. The pulley assembly for a suspension support device of a closed wind tunnel test model as described in claim 3, characterized in that, Each of the pulley groups includes two pulleys (36) whose positional relationship is configured such that the rope (40) is tensioned by the pulleys (36) during the rotation of the pulley group without interfering with the sleeve, and the pulley group does not interfere with the wind tunnel wall.

5. The pulley assembly for a suspension support device of a closed wind tunnel test model as described in claim 1, characterized in that, The bracket (35) of the pulley block is mounted on the end of the sleeve via a bearing and rotates relative to the sleeve about the first rotation axis via the bearing.

6. The pulley assembly for a suspension support device of a closed wind tunnel test model as described in claim 1, characterized in that, The sleeve includes an inner liner (31) and an outer fixing sleeve (32); the inner liner (31) penetrates the wind tunnel wall (10) and has the channel (312); there are two outer fixing sleeves (32), which are respectively inserted into the inner liner (31) from both ends and fixed to the inner liner (31), and the two outer fixing sleeves (32) cooperate to clamp the wind tunnel wall (10) to fix the sleeve.

7. The pulley assembly for a suspension support device of a closed wind tunnel test model as described in claim 5, characterized in that, It also includes reinforcing blocks (37), at least two in number; the sleeve obliquely penetrates the wind tunnel wall (10), and the two reinforcing blocks (37) are fixed to the outer wall of the sleeve and located on the inner and outer sides of the wind tunnel wall (10) respectively, and are in close contact with the inner and outer sidewalls of the wind tunnel wall (10) respectively, so as to fix the pulley assembly in the direction of the first rotation axis. And forms an acute-angled groove with both the outer and inner sides of the wind tunnel wall (10); the reinforcing block (37) is adapted to be embedded in the groove and abut against the wind tunnel wall (10) and the sleeve.

8. A support device for a wind tunnel test model, used to suspend and support an aircraft model (20) for wind tunnel testing, characterized in that, Includes a pulley assembly, a rope (40), and a rope (40) traction device for a closed wind tunnel test model suspension support device as described in any one of claims 1-7; one end of the rope (40) is connected to the rope (40) traction device, and the other end is connected to the aircraft model (20), and is supported and reversed by the pulley assembly.

9. A wind tunnel testing apparatus, characterized in that, It includes a wind tunnel body formed by the wind tunnel wall (10) and a support device for the wind tunnel test model as described in claim 8.

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