Vertical wind tunnel device for disc structure wind tunnel experiment

Abstract

The invention discloses a vertical wind tunnel device for a disk-type structure wind tunnel experiment. The vertical wind tunnel device comprises a main body frame (1), an acting force detection rack (2), a flow blocking mechanism (3) and a fan (4), the acting force detection rack, the flow blocking mechanism and the fan are all mounted on the basis of the main body frame, the flow blocking mechanism is located below the acting force detection rack, and the fan is located below the flow blocking mechanism; the acting force detection rack is provided with a detection object suspension mechanism, and the detection object suspension mechanism is used for suspending a detection object (6); the fan is used for outputting upward airflow towards an upper detection object; the flow blocking mechanism is used for blocking airflow output by the fan from reaching the acting force detection rack; and the acting force detection rack is used for detecting the stress state of the detected object. The vertical wind tunnel device provided by the invention can simulate a vertically upward small wind flow field environment, so that the force measurement requirement of a light and miniature structure in a wind tunnel experiment can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to a fluid mechanics wind tunnel experiment device, in particular to a vertical wind tunnel device for disc structure wind tunnel experiment. BACKGROUND

[0002] With the rapid development of modern technology, disc structures such as umbrella-shaped hole structures and net structures have emerged due to their light weight and small size. The pterocladus-like aircraft is a typical umbrella-shaped hole structure and has been a popular research topic in recent years. Researchers at home and abroad have conducted a large number of numerical studies on pterocladus-like structures. Currently, wind tunnel tests of such umbrella-shaped structures can only use PIV technology to study the flow field characteristics, and there is no direct measurement device to measure the aerodynamic characteristics. Traditional wind tunnels, force measuring equipment and test methods have increasingly highlighted their limitations and are difficult to fully meet current research and development requirements. The aerodynamic characteristics of traditional aircraft are measured in a horizontal experimental wind tunnel. Based on the relativity principle, the measured aircraft is fixed in the wind tunnel, and data is obtained through force measuring devices installed in the wind tunnel. The force on the aircraft installed in the wind tunnel is studied to understand the aerodynamic characteristics of the actual aircraft.

[0003] Since traditional experimental wind tunnels and force platforms are designed and developed for traditional aircraft, and models such as pterocladus-like aircrafts have certain uniqueness in structure and aerodynamic characteristics, traditional experimental wind tunnels and force platforms cannot meet the measurement needs of the models. In addition, the force measuring platform needs to have high measurement accuracy to meet the measurement needs of small and light structures, and the force measuring platform should not affect the measurement results when used in the wind tunnel.

[0004] In summary, the current problem is that:

[0005] There is no wind tunnel experiment device in the prior art that can be used for aerodynamic characteristic research of umbrella-shaped structures. SUMMARY

[0006] The purpose of the present application is to provide a vertical wind tunnel device for disc structure wind tunnel experiment, which can meet the force measurement needs of light and small structures in wind tunnel experiment.

[0007] In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0008] A vertical wind tunnel device for disc structure wind tunnel experiment, the vertical wind tunnel device comprises a main frame, a force detection rack, a flow blocking mechanism and a fan; the force detection rack, the flow blocking mechanism and the fan are all installed and arranged based on the main frame, the flow blocking mechanism is located below the force detection rack, and the fan is located below the flow blocking mechanism; the force detection rack is provided with a detection object suspension mechanism for suspending a detection object; the fan is used for outputting upward airflow to the upward detection object; the flow blocking mechanism is used for blocking the airflow output by the fan from reaching the force detection rack; and the force detection rack is used for detecting the stress state of the detection object.

[0009] A vertical wind tunnel device for disc structure wind tunnel experiment, the vertical wind tunnel device comprises a main frame, a force detection rack, a flow blocking mechanism and a fan; the force detection rack comprises an upper platform and a lower platform, the upper platform is fixedly assembled based on the main frame, and an action force detection mechanism is arranged between the upper platform and the lower platform, and the upper platform and the lower platform are connected together through the action force detection mechanism; the lower part of the lower platform is provided with a detection object suspension mechanism for suspending a detection object; the flow blocking mechanism comprises a base column and a flow blocking plate, the base column is fixedly assembled based on the main frame, and the flow blocking plate is fixedly assembled based on the base column, the flow blocking plate is located below the force detection rack, the fan is installed and arranged based on the main frame, and the fan is located below the flow blocking mechanism, and the fan outputs airflow upward.

[0010] Further, the action force detection mechanism is specifically implemented in the following structure: the force detection rack further comprises a plurality of vertical state tension and pressure detection rods and a plurality of horizontal state tension and pressure detection rods, the vertical state tension and pressure detection rods are in a vertical state between the upper platform and the lower platform, and the two ends of the vertical state tension and pressure detection rods are connected with the upper platform and the lower platform respectively; the horizontal state tension and pressure detection rods are in a horizontal state between the upper platform and the lower platform, and the two ends of the horizontal state tension and pressure detection rods are connected with the upper platform and the lower platform respectively; all the vertical state tension and pressure detection rods and the horizontal state tension and pressure detection rods are combined together to form the action force detection mechanism.

[0011] Further, the tension and pressure detection rod comprises an elastic connecting rod and a tension and pressure sensor; the elastic connecting rod is in a strip shape, is made of an elastic material and has elastic tensile property; the tension and pressure sensor can detect pressure and tension; and the tension and pressure sensor is assembled together with one end of the elastic connecting rod to form a complete tension and pressure detection rod.

[0012] Further, all the vertical state tension and pressure detection rods are uniformly and discretely distributed at the peripheral parts of the force detection rack; and all the horizontal state tension and pressure detection rods are uniformly and discretely distributed at the middle positions of the force detection rack.

[0013] Further, the flow blocking mechanism further comprises a flow dispersion tower, which is used to disperse the airflow entering from below into the flow dispersion tower.

[0014] Further, the flow dispersion tower comprises a plurality of annular flow dispersion pages, each of which is outwardly configured, and all of which are stacked together to form the flow dispersion tower with an outwardly configured air guide.

[0015] Further, the flow dispersion tower is provided with a relief compartment, and the flow blocking plate is provided with a relief groove.

[0016] Further, the detection object suspension mechanism comprises a plurality of suspension cable mechanisms, each of which comprises a sliding rail, a sliding table and a suspension cable, the sliding rail is arranged based on the lower part of the lower platform, the sliding table and the sliding rail are assembled to form a linear sliding mechanism, the upper end of the suspension cable is assembled and connected with the sliding table, and the lower end of the suspension cable is used to be connected with the detection object.

[0017] Further, the sliding rails of all the suspension cable mechanisms are directed towards the center of the lower platform.

[0018] The vertical wind tunnel device for disc structure wind tunnel experiment of the present application has the following main beneficial effects compared with the prior art:

[0019] The force detection bench arranged in the vertical wind tunnel device for disc structure wind tunnel experiment can realize the function of detecting six-dimensional force, the airflow output by the fan is vertically upward, the small vertical wind flow field environment can be simulated, and thus the force measurement requirement of lightweight and miniature structure in the wind tunnel experiment can be met. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the vertical wind tunnel device for disc structure wind tunnel experiment of the present application;

[0021] Figure 2 It is a schematic diagram of the structure of the force detection bench in the vertical wind tunnel device of the present application;

[0022] Figure 3 It is a schematic diagram of the structure of the force detection bench in the vertical wind tunnel device of the present application; Figure 2 It is an enlarged schematic diagram of the position indicated by arrow A in the above figure;

[0023] Figure 4 It is a schematic diagram of the force detection bench in the vertical wind tunnel device of the present application;

[0024] Figure 5 It is a schematic diagram of the detection object suspension mechanism arranged at the lower part of the force detection bench in the vertical wind tunnel device of the present application;

[0025] Figure 6This is a schematic diagram of the suspension mechanism used in the vertical wind tunnel device of the present invention;

[0026] Figure 7 This is a schematic diagram of the flow-blocking mechanism in the vertical wind tunnel device of the present invention. Detailed Implementation

[0027] The following provides further details on specific embodiments of the present invention:

[0028] This embodiment provides a vertical wind tunnel device for wind tunnel experiments on disc-shaped structures. This vertical wind tunnel device is used to simulate a small vertically upward wind flow field environment, providing equipment support for wind tunnel experiments on some small components (especially umbrella-shaped components).

[0029] See Figure 1 The vertical wind tunnel device in this embodiment mainly includes a main frame 1, a force detection platform 2, a flow-blocking mechanism 3, a fan 4, and a suspension mechanism 5.

[0030] The main frame 1 serves as the mounting base for supporting and assembling all other functional components. The force detection platform 2, the flow blocking mechanism 3, the fan 4, and the suspension mechanism 5 are installed as a whole based on the main frame 1.

[0031] See Figure 2 The force testing platform 2 mainly includes an upper platform 21, a lower platform 22, and numerous tension and compression testing rods 23.

[0032] The upper platform 21 and the lower platform 22 have similar basic shapes, both being disc-shaped with a hole in the center.

[0033] See Figure 3 The tension / compression detection rod 23 consists of two small components: an elastic connecting rod 235 and a tension / compression sensor 236. The elastic connecting rod 235 is elongated and made of an elastic material, possessing elastic tensile properties (similar to a rubber band). The tension / compression sensor 236 is a prior art device capable of detecting both pressure and tension. The tension / compression sensor 236 is assembled with one end of the elastic connecting rod 235 to form the complete tension / compression detection rod 23. Specifically, a flexible hinge is provided at one end of the elastic connecting rod 235, and the tension / compression sensor 236 is assembled and connected to the elastic connecting rod 235 through the flexible hinge. The tension / compression detection rod 23 possesses both "elastic tension / compression" properties and "tension / compression detection" functions.

[0034] In the entire force testing bench 2, the upper platform 21 is located at the top and the lower platform 22 is located at the bottom. The two are connected together by the numerous tension and compression testing rods 23, thus forming a complete force testing bench 2.

[0035] The upper platform 21 is fixedly assembled based on the main body frame 1, so that the entire force detection bench 2 is fixedly assembled based on the main body frame 1, and the lower platform 22 is in a floating state.

[0036] It should be noted that the plurality of tension and compression detection rods 23 are divided into two types, one is the vertical tension and compression detection rod 231, and the other is the horizontal tension and compression detection rod 232. The two types of tension and compression detection rods 23 are consistent in structure and have no difference. The difference between the two lies in the different installation directions and different functions.

[0037] Specifically,

[0038] In this embodiment, a total of 8 tension and compression detection rods 23 are provided, of which 4 are vertical tension and compression detection rods 231, and the other 4 are horizontal tension and compression detection rods 232.

[0039] As for the vertical tension and compression detection rod 231, it is in a vertical state between the upper platform 21 and the lower platform 22. The upper end of the vertical tension and compression detection rod 231 is connected to the upper platform 21, and the lower end of the vertical tension and compression detection rod 231 is connected to the lower platform 22. All four vertical tension and compression detection rods 231 are evenly and discretely distributed at the peripheral positions of the entire force detection bench 2.

[0040] As for the horizontal tension and compression detection rod 232, it is in a horizontal state between the upper platform 21 and the lower platform 22. On the upper platform 21 and the lower platform 22, a force measuring base plate 24 is fixedly provided for each horizontal tension and compression detection rod 232. That is, four force measuring base plates 24 are provided on the upper platform 21 and the lower platform 22. One end of the horizontal tension and compression detection rod 232 is connected to the upper platform 21 through the force measuring base plate 24 provided based on the upper platform 21, and the other end of the horizontal tension and compression detection rod 232 is connected to the lower platform 22 through the force measuring base plate 24 provided based on the lower platform 22. All four horizontal tension and compression detection rods 232 are evenly and discretely distributed at the central positions of the entire force detection bench 2.

[0041] The combination of the plurality of tension and compression detection rods 23 between the upper platform 21 and the lower platform 22 actually constitutes a force detection mechanism, which can realize the function of detecting six-dimensional forces (including three forces and three moments). In other embodiments, other forms of force detection mechanisms can be used to replace the combination of the plurality of tension and compression detection rods 23.

[0042] Referring to Figure 4 , Figure 5 and Figure 6In the lower part of the lower platform 22, four sets of suspension cable mechanisms 5 are arranged, which are combined to form a detection object suspension mechanism, which is used to suspend the detection object below the force detection rack 2.

[0043] Specifically,

[0044] In terms of a single suspension cable mechanism 5, it mainly comprises a slide rail 51 arranged based on the lower part of the lower platform 22, a slide table 52 assembled with the slide rail 51 to form a linear sliding mechanism, and a suspension cable 53 of which the upper end is assembled and connected with the slide table 52 and the lower end is used to be connected with the detection object 6. After the suspension cables 53 of the four sets of suspension cable mechanisms 5 are connected with the detection object 6, the detection object 6 can be suspended below the force detection rack 2.

[0045] It should be noted that the guide directions of the slide rails 51 of the four suspension cable mechanisms 5 are all towards the center of the lower platform 22, so that the suspension position of the detection object 6 relative to the force detection rack 2 can be adjusted by adjusting the sliding positions of the slide tables 52, and the gravity center of the detection object 6 should be located directly below the center of the force detection rack 2 as much as possible.

[0046] Referring to Figure 7 , the flow blocking mechanism 3 mainly comprises a base column 31, a flow dispersion tower 32, and a flow blocking plate 33.

[0047] In the entire flow blocking mechanism 3, the base column 31 serves as a mounting base, the flow dispersion tower 32 and the flow blocking plate 33 are assembled based on the base column 31, and the flow blocking plate 33 is located above the flow dispersion tower 32. The base column 31 is fixedly assembled based on the main body frame 1, so that the entire flow blocking mechanism 3 is fixedly assembled based on the main body frame 1.

[0048] The flow dispersion tower 32 has a special configuration, which is composed of a plurality of annular flow dispersion leaves 321. Each annular flow dispersion leaf 321 has a circular ring configuration and expands from bottom to top. In order to facilitate description, the configuration of the annular flow dispersion leaf 321 is defined as an "outward configuration". All the annular flow dispersion leaves 321 are stacked together with a certain spacing, thereby forming a complete flow dispersion tower 32.

[0049] It should be noted that in the flow dispersion tower 32, in terms of two adjacent annular flow dispersion leaves 321, the diameter of the upper annular flow dispersion leaf 321 is always greater than the diameter of the lower annular flow dispersion leaf 321. The entire flow dispersion tower 32 looks like a pyramid. In order to facilitate description, the configuration of the flow dispersion tower 32 is defined as an "outward wind guide configuration".

[0050] The flow diffuser tower 32 has a function of guiding the fluid entering the flow diffuser tower 32 from below to diffuse outward. The flow baffle 33 located above the flow diffuser tower 32 can further force the fluid to diffuse outward, thereby preventing the upward airflow from affecting the detection accuracy of the upper force detection bench 2.

[0051] It should be noted that, in order not to affect the adjustment of the suspension mechanism 5, the flow diffuser tower 32 is provided with an avoidance compartment 322, and the flow baffle 33 is provided with an avoidance groove 331, which are arranged at positions corresponding to the moving position of the suspension cable 53. When the suspension mechanism 5 is adjusted to move the suspension cable 53, the suspension cable 53 is always within the avoidance range of the avoidance compartment 322 and the avoidance groove 331, so as not to interfere with the flow blocking mechanism 3 (the flow diffuser tower 32 and the flow baffle 33).

[0052] When the lower part of the force detection bench 2 is suspended with the detection object 6, the flow blocking mechanism 3 should be located between the force detection bench 2 and the detection object 6, and has a function of separating the force detection bench 2 from the detection object 6 and the fan 4 below, so as to prevent the upward airflow output by the fan 4 from reaching the force detection bench 2, and prevent the airflow from interfering with the detection accuracy of the force detection bench 2.

[0053] Referring to Figure 1 , the fan 4 is installed based on the main frame 1, is located directly below the flow blocking mechanism 3, and when the lower part of the force detection bench 2 is suspended with the detection object 6, the fan 4 should be located below the detection object 6, and the fan 4 is used to output the vertical upward airflow toward the detection object 6 above the detection object 6.

[0054] The vertical wind tunnel device of the embodiment has the following use method and working principle:

[0055] It should be noted that, in the embodiment, the detection object 6 is a disc structure such as an umbrella structure.

[0056] One end of the suspension cable 53 is tied to the detection object 6, so that the detection object 6 is suspended in the air based on the lower platform 22 of the force detection bench 2, and is located below the flow blocking mechanism 3 and above the fan 4 (that is, in the space between the flow blocking mechanism 3 and the fan 4), the tension and compression detection rod 23 in the force detection bench 2 is connected with the external terminal device, and the external terminal device can obtain the detection data of the tension and compression detection rod 23.

[0057] The fan 4 is started, and the fan 4 outputs upward air flow towards the detection object 6 in the upper direction, so as to form a wind tunnel effect on the detection object 6, and the detection object 6 changes its force state under the action of the vertical upward air flow; the force detection bench 2 detects the force state of the detection object 6, and transmits the obtained detection data to an external terminal device; the external terminal device obtains the force state data of the detection object 6 through the force detection bench 2, and the data is wind tunnel experiment data.

[0058] The air flow entering the flow blocking mechanism 3 through the detection object 6 is diffused and dissipated in all directions under the outward guiding of the flow blocking mechanism 3, so as to not affect the force detection bench 2 in the upper direction.

[0059] It should be noted that in the embodiment, the suspension cable 53 is a flexible wire.

[0060] The vertical wind tunnel device of the embodiment has the following main beneficial effects:

[0061] 1) The vertical wind tunnel device of the embodiment can be used on a desktop, and the force detection bench 2 can detect six-dimensional force, and the fan 4 outputs vertical upward air flow, so as to meet the force measurement requirement of a light and small structure (especially an umbrella structure) in a wind tunnel experiment.

[0062] In addition, the vertical wind tunnel device of the embodiment has other advantages, as follows:

[0063] 2) In the vertical wind tunnel device of the embodiment, four positions can be selected on the slide rail 51 to provide suspension positions for models of different sizes.

[0064] 3) In the vertical wind tunnel device of the embodiment, the tension and compression detection rod 23 is assembled and connected with the tension and compression sensor 236 through the flexible hinge and the elastic connecting rod 235, so that the force and torque acting on the force detection bench 2 are mechanically decomposed, and the mutual interference and coupling between components are less.

[0065] The above is only a preferred embodiment of the application, and is not used to limit the protection scope of the application, so any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A vertical wind tunnel device for disc-like structure wind tunnel experiments, characterized by: The vertical wind tunnel device includes a main frame (1), a force detection platform (2), a flow-blocking mechanism (3), and a fan (4); The force detection stand (2), the flow blocking mechanism (3) and the fan (4) are all installed on the main frame (1). The flow blocking mechanism (3) is located below the force detection stand (2) and the fan (4) is located below the flow blocking mechanism (3). The force testing stand (2) is equipped with a test object suspension mechanism, which is used to suspend the test object (6); The fan (4) is used to output an upward airflow toward the detection object (6) above; The flow-blocking mechanism (3) is used to prevent the airflow output by the fan (4) from reaching the force detection stand (2); The force testing stand (2) is used to detect the force state of the test object (6).

2. A vertical wind tunnel apparatus for disc-like structure wind tunnel experiments, characterized by: The vertical wind tunnel device includes a main frame (1), a force detection platform (2), a flow-blocking mechanism (3), and a fan (4); The force detection stand (2) includes an upper platform (21) and a lower platform (22). The upper platform (21) is fixedly assembled based on the main frame (1). A force detection mechanism is provided between the upper platform (21) and the lower platform (22). The upper platform (21) and the lower platform (22) are connected together through the force detection mechanism. The lower part of the lower platform (22) is provided with a detection object suspension mechanism, which is used to suspend the detection object (6); The flow-blocking mechanism (3) includes a base column (31) and a flow-blocking plate (33). The base column (31) is fixedly assembled based on the main frame (1), and the flow-blocking plate (33) is fixedly assembled based on the base column (31). The flow-blocking plate (33) is located below the force detection platform (2). The fan (4) is installed on the main frame (1), and the fan (4) is located below the flow blocking mechanism (3). The fan (4) outputs airflow upwards.

3. The vertical wind tunnel device for wind tunnel experiments on disc-shaped structures according to claim 2, characterized in that: The force detection mechanism is specifically implemented in the following structural form: The force testing platform (2) also includes several vertical tension / compression testing rods (231) and several horizontal tension / compression testing rods (232). The vertical tension and compression testing rod (231) is vertical between the upper platform (21) and the lower platform (22), and the two ends of the vertical tension and compression testing rod (231) are connected to the upper platform (21) and the lower platform (22) respectively; The horizontal tension and compression testing rod (232) is horizontal between the upper platform (21) and the lower platform (22), and the two ends of the horizontal tension and compression testing rod (232) are connected to the upper platform (21) and the lower platform (22) respectively; All the vertical tension / compression testing rods (231) and the horizontal tension / compression testing rods (232) are combined together to form the force testing mechanism.

4. The vertical wind tunnel device for wind tunnel experiments on disc-shaped structures according to claim 3, characterized in that: The tension / compression detection rod includes an elastic connecting rod (235) and a tension / compression sensor (236); The elastic link (235) is long and narrow, made of elastic material, and has elastic tensile properties; The tension / compression sensor (236) is capable of detecting pressure and tension; The tension / compression sensor (236) is assembled with one end of the elastic link (235) to form a complete tension / compression detection rod.

5. The vertical wind tunnel device for wind tunnel experiments on disc-shaped structures according to claim 3, characterized in that: All the vertical tension and compression test rods (231) are evenly and discretely distributed around the periphery of the force testing platform (2); All horizontal tension and compression test rods (232) are evenly and discretely distributed in the middle of the force testing platform (2).

6. The vertical wind tunnel apparatus for wind tunnel experiments on disc-shaped structures according to claim 2, characterized in that: The flow-blocking mechanism (3) also includes a diffuser tower (32) for dissipating the airflow entering the diffuser tower (32) from below.

7. The vertical wind tunnel apparatus for wind tunnel experiments on disc-shaped structures according to claim 6, characterized in that: The diffuser tower (32) includes a number of annular diffuser blades (321), each of which is outwardly oriented. All the annular diffuser blades (321) are stacked together to form a diffuser tower (32) with an outwardly oriented windward configuration.

8. The vertical wind tunnel apparatus for wind tunnel experiments on disc-shaped structures according to claim 6, characterized in that: The diffuser tower (32) is provided with a clearance compartment (322), and the baffle plate (33) is provided with a clearance groove (331).

9. The vertical wind tunnel apparatus for wind tunnel experiments on disc-shaped structures according to claim 2, characterized in that: The suspension mechanism for the detection object includes several suspension cable mechanisms (5). The suspension mechanism (5) includes a slide rail (51), a slide table (52), and a suspension cable (53). The slide rail (51) is set based on the lower part of the lower platform (22). The slide table (52) and the slide rail (51) are assembled to form a linear sliding mechanism. The upper end of the suspension cable (53) is assembled and connected to the slide (52), and the lower end of the suspension cable (53) is used to connect to the object to be tested (6).

10. The vertical wind tunnel apparatus for wind tunnel experiments on disc-shaped structures according to claim 9, characterized in that: The guide rails (51) of all suspension mechanisms (5) are all oriented toward the center of the lower platform (22).

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