Three-mode rotating support operating under arc wind tunnel condition and using method thereof

Abstract

The invention provides a three-mode rotating support operating under an electric arc wind tunnel condition and a using method thereof. The three-mode rotating support comprises a rotating disc, a rotating shaft, an electric rotating disc, an electric push-pull rod, a model support, a push-pull sliding ring and a supporting rod. The outer ring of the rotating disk is provided with three uniformly distributed mounting sheets, and each mounting sheet is provided with a model support through a rotating shaft. The electric rotating disc drives the rotating shaft and the rotating disc to rotate integrally, and sequential switching of the three models at the arc wind tunnel nozzle outlet checking station is achieved. The electric push-pull rod drives the push-pull slip ring to move axially and converts linear motion into pitching rotation of the model support through the supporting rod, so that the attack angle of the model is adjusted in real time during examination. According to the invention, continuous examination of three models can be completed in one vacuum-pumping period, dynamic change of the angle of attack in the test process is supported, and the efficiency and the data acquisition capability of the arc wind tunnel test are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aerodynamic thermal protection ground simulation test equipment, in particular to a three-module rotating support operated under the condition of an arc wind tunnel and a use method thereof. BACKGROUND

[0002] When high-speed aircraft outer thermal protection materials are subjected to thermal protection ground simulation tests, they are usually tested in an arc wind tunnel. The arc wind tunnel uses an electric arc to heat air to form a high-temperature high-speed airflow, which heats and tests the thermal protection material model flowing therethrough.

[0003] During the test, the test chamber is usually in a vacuum environment. After each model test is completed, the large-volume test chamber needs to be vacuumed and evacuated, which takes a long time and reduces test efficiency. Therefore, there is an urgent need for a support device that can complete the test of multiple models during the vacuuming and evacuation process. SUMMARY

[0004] The present application aims to provide a three-module rotating support operated under the condition of an arc wind tunnel and a use method thereof, which can complete the test of three models in one test preparation, significantly improving test efficiency.

[0005] According to one object of the present application, the present application provides a three-module rotating support operated under the condition of an arc wind tunnel, comprising: a rotating disc, the outer ring of which is uniformly provided with three mounting pieces along the circumference, and each mounting piece is provided with a mounting hole at the end thereof; three model supports, each of which is rotatably mounted on the mounting hole through a rotating shaft; a rotating shaft fixedly connected to the center of the rotating disc; an electric rotating disc connected to the rotating shaft at the driving end, used to drive the rotating shaft and the rotating disc to rotate together, so as to switch any model support to the test station in front of the arc wind tunnel nozzle outlet; an electric push-pull rod arranged inside the rotating shaft; a push-pull slip ring sleeved outside the rotating shaft and connected to the output end of the electric push-pull rod, which moves linearly along the axial direction of the rotating shaft under the drive of the electric push-pull rod; a support rod, one end of which is hingedly connected to the back of the model support, and the other end is hingedly connected to the push-pull slip ring; wherein the linear motion of the push-pull slip ring is converted into the rotary motion of the model support around its rotating shaft through the support rod, so as to adjust the angle of attack of the model mounted on the model support relative to the airflow.

[0006] Further, the three mounting pieces of the rotating disc are evenly distributed at 120°.

[0007] Further, the rotating shaft is a hollow tubular shaft, and at least one long slot is formed in the sidewall of the rotating shaft in the axial direction; the inner wall of the push-pull sliding ring is provided with a limiting block, and the limiting block is embedded in the long slot to limit the axial movement of the push-pull sliding ring along the rotating shaft.

[0008] Further, the three long slots in the sidewall of the rotating shaft are evenly distributed at 120° in the circumferential direction; and the push-pull sliding ring has three corresponding limiting blocks.

[0009] Further, the electric push-pull rod comprises a servo motor, a ball screw, and a screw nut sleeved on the ball screw; the servo motor drives the ball screw to rotate, thereby driving the screw nut to move linearly; and the screw nut is fixedly connected with the push-pull sliding ring.

[0010] Further, the model support has a cuboid main body, and a square cavity for accommodating the model is arranged in the middle of the model support; when the model is installed in the square cavity, the model test surface is flush with the outer surface of the model support.

[0011] According to another object of the present application, the present application provides a use method of the above-mentioned three-mode rotating support operating under the condition of an arc wind tunnel, comprising the following steps: S1: installing three models to be tested on the three model supports, respectively; S2: rotating and positioning the first model support to the test position in front of the outlet of the arc wind tunnel nozzle by controlling the electric rotating disc; S3: closing the test cabin and performing vacuumizing operation; S4: opening the valve of the arc wind tunnel to make the high-temperature and high-speed airflow ablate the model in the test position; S5: during the test, driving the push-pull sliding ring to move by controlling the electric push-pull rod, and then adjusting the pitch angle of the model support by the supporting rod to change the angle of attack of the model; S6: after the test of the current model is completed, rotating the electric rotating disc to switch the next model support to the test position, and repeating steps S4 and S5 until all three models are tested.

[0012] Further, in step S5, the angle of attack of the model is continuously or stepwise adjusted by the electric push-pull rod during a single test to simulate different flight attitudes for testing.

[0013] Further, in step S2, the servo motor of the electric rotating disc is used for precise angle control to ensure that the model support is accurately positioned.

[0014] Further, after all model examinations are completed, the arc tunnel valve is closed, the test chamber is broken vacuum, and the test chamber door is opened to replace the model.

[0015] The technical scheme of the present application realizes double promotion of test efficiency and examination capacity through the integrated structure design of rotation switching and pitch adjustment. The support drives the rotating disc through the electric rotating disc to sequentially and accurately send the three models to the same examination station, thereby innovating the traditional 'one preparation, one test' mode to 'one preparation, three tests', saving the intermediate two complicated vacuum breaking and vacuum re-creating processes, and theoretically increasing the test efficiency by three times. Meanwhile, the electric push-pull rod mechanism integrated in the rotating shaft converts the linear motion into the independent pitch motion of each model through the push-pull slip ring and the support rod, so that the model attack angle can be dynamically and accurately adjusted in a single examination to simulate different attack angle states in real flight, and a plurality of ablation data of the same model under different attitudes can be obtained in one test, greatly enriching the dimension and value of the test data. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the specific embodiments or prior art of the present application, the drawings needed to be used in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application. Figure 2 It is a schematic diagram of the connection between the model support and the rotating disc of the embodiment of the present application. Figure 3 It is a schematic diagram of the connection between the model support and the push-pull slip ring of the embodiment of the present application.

[0018] In the figure: 1, rotating disc; 1-1, mounting hole; 1-2, mounting piece; 1-3, flange plate; 2, rotating shaft; 3, electric push-pull rod; 4, electric rotating disc; 5, model support; 5-1, rotating shaft; 5-2, model; 5-3, connecting hole; 6, push-pull slip ring; 6-1, hanging point hole; 7, support rod; 8, base; 9, arc tunnel nozzle outlet. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0020] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Embodiment 1 As shown in Figures 1-3 , the three-mode rotating support running under arc tunnel conditions in this embodiment includes a rotating disc 1, a rotating shaft 2, an electric push-pull rod 3, an electric rotating disc 4, a model support 5, a push-pull slip ring 6, a support rod 7 and a base 8; wherein: As shown in Figure 1 and Figure 2 , the outer ring of the rotating disc 1 is provided with three evenly distributed mounting pieces 1-2, and each mounting piece 1-2 is provided with a model support mounting hole 1-1 at the end; The model support 5 is mounted on the model support mounting hole 1-1 through the rotating shaft 5-1 and can rotate around the rotating shaft 5-1; the model support 5 is used for installing the model; three model supports 5 are respectively installed on the three mounting pieces 1-2 of the rotating disc 1 and can independently rotate around the rotating shaft 5-1.

[0023] The electric rotary disc 4 drives the rotating shaft 2 and the rotating disc 1 to rotate, so as to switch the model support 5 located at the center of the exit 9 of the arc wind tunnel nozzle; The electric push-pull rod 3 drives the model support 5 to rotate through the push-pull sliding ring 6 and the supporting rod 7, so as to adjust the angle of attack of the model 5-2 relative to the high-temperature and high-speed airflow.

[0024] Specifically, as shown in Figure 1 and Figure 2 , the rotating disc 1 is a flange disc structure, a through hole is arranged at the center, and three mounting pieces 1-2 are uniformly distributed at an interval of 120° at the outer ring.

[0025] The rotating shaft 2 is a hollow shaft with a central through hole, and a connecting flange is arranged at each end, and three long holes are arranged at an interval of 120° on the side wall.

[0026] The electric push-pull rod 3 comprises a servo motor, a ball screw and a screw nut; the servo motor drives the ball screw to rotate, and drives the screw nut to move linearly. The ball screw and the screw nut of the electric push-pull rod 3 extend into the inner hole of the rotating shaft 2, and the servo motor is fixed on the end face of the rotating shaft 2 through the flange. The push-pull sliding ring 6 is fixed with the screw nut of the electric push-pull rod 3 through fasteners, so that the electric push-pull rod 3 can drive the push-pull sliding ring 6 to move linearly.

[0027] The electric rotary disc 4 comprises a servo motor and a reducer, and the servo motor drives the inner hole flange disc to rotate at low speed and large torque through the reducer. The electric rotary disc 4 is fixed on one side of the base 8, the inner flange hole is connected with the rotating shaft 2, and the rotating disc 1 is driven to rotate by driving the rotating shaft 2 to rotate.

[0028] The model support 5 is a cuboid structure with a square cavity arranged at the center, and a rotating shaft 5-1 is arranged on the upper and lower end faces, and the model 5-2 is arranged in the square cavity and flush with the surface.

[0029] The push-pull sliding ring 6 is a flange structure with holes, three hanging point holes 6-1 are uniformly distributed at an interval of 120° on the outer side, and three limiting blocks are uniformly distributed at an interval of 120° in the inner hole. The push-pull sliding ring 6 is arranged on the rotating shaft 2, the limiting blocks in the inner hole are clamped in the long holes of the rotating shaft 2, so that the push-pull sliding ring 6 can only move linearly along the rotating shaft 2.

[0030] As shown in Figure 3 , the supporting rod 7 is a rod member with mounting holes arranged at both ends, which is used for connecting the model support and the push-pull sliding ring. One end of the supporting rod 7 is connected with the connecting hole 5-3 on the back surface of the model support 5, and the other end of the supporting rod 7 is connected with the hanging point hole 6-1 of the push-pull sliding ring 6.

[0031] The base 8 is used for supporting the whole device, and the base 8 is a support with a through hole arranged at the top end, which is used for fixing the rotating shaft 2.

[0032] The use method of the three-model rotating support operating under the condition of the arc wind tunnel comprises the following steps: The three models 5-2 are respectively installed in the square cavities of the three model supports 5; The first model support 5 is rotated to the center of the arc wind tunnel nozzle outlet 9 using the electric turntable 4. Close the test chamber and evacuate it; Open the valve and use a high-temperature, high-speed airflow to perform ablation testing on model 5-2; Adjust the angle of attack of the model support 5 using the electric push-pull rod 3; After completing the assessment, switch to the next model support 5 via the electric turntable 4; Repeat the above process until the assessment of the three models is completed.

[0033] During the assessment, the angle of attack of model 5-2 was adjusted in real time using electric push-pull rod 3.

[0034] After the test is completed, close the valve, release the vacuum, open the test chamber, and replace the model.

[0035] An electric arc wind tunnel testing system includes the aforementioned three-mode rotating support and an electric arc wind tunnel nozzle outlet 9. The three-mode rotating support is placed inside the test chamber and can automatically switch models and adjust angle of attack via an electric turntable 4 and an electric push-pull rod 3.

[0036] A method to improve the efficiency of electric arc wind tunnel testing is to use the aforementioned three-mode rotating support to complete the testing of three models in one vacuuming and devastating process.

[0037] Example 2 like Figures 1-3 As shown in the figure, this embodiment of a three-mode rotating support operating under electric arc wind tunnel conditions mainly consists of a rotating disk 1, a rotating shaft 2, an electric push-pull rod 3, an electric turntable 4, a model support 5, a push-pull slip ring 6, a support rod 7, and a base 8.

[0038] Specifically, the rotating disk 1 has a flange structure, with the main body being flange 1-3, a through-shaft hole in the center, and three mounting plates 1-2 evenly distributed at 120° on the outer ring. The ends of the mounting plates are provided with model bracket mounting holes 1-1.

[0039] The rotating shaft 2 is a hollow shaft with a central opening, connecting flanges at both ends, and three elongated holes spaced 120° apart on the side wall.

[0040] The electric push-pull rod 3 includes a servo motor, a ball screw, and a screw nut. The servo motor controls the rotation of the ball screw, which in turn drives the screw nut to perform linear motion.

[0041] The electric turntable 4 includes a servo motor and a reducer. The servo motor drives the inner flange to rotate at low speed and high torque through the reducer.

[0042] Model support 5 is used to mount the model. It is a cuboid with a central square cavity. Rotating shafts are located on the top and bottom faces of the cuboid. The cube-shaped model is installed inside the square cavity and subjected to the high-temperature airflow from the nozzle exit of the electric arc wind tunnel. Model support 5 is a cuboid structure with a central square cavity. Rotating shafts 5-1 are located on the top and bottom faces. Model 5-2 is placed inside the square cavity and flush with its surface. Three model supports 5 are fixed to the end faces 1-1 of the three mounting plates 1-2 of the rotating disk 1 via rotating shafts 5-1. They can rotate around the rotating shafts 5-1. Model 5-2 is placed inside the square cavity of model support 5 and remains flush with its surface. One model support 5 is positioned at the exact center of the nozzle exit 9 of the electric arc wind tunnel. The high-temperature, high-speed airflow from the nozzle exit 9 conducts an ablation test on model 5-2 on model support 5. Model support 5 changes the angle of attack relative to the high-temperature, high-speed airflow by rotating around the rotating shafts 5-1, thus changing the test conditions.

[0043] The push-pull slip ring 6 has a perforated flange structure, with three hanging point holes 6-1 evenly distributed at 120° on the outer side and three limit blocks evenly distributed at 120° on the inner side.

[0044] The support rod 7 is a rod with mounting holes at both ends, used to connect the model support 5 and the push-pull slip ring 6.

[0045] The base 8 is a bracket with a through hole at the top for fixing the rotating shaft 2.

[0046] The nozzle outlet 9 of the electric arc wind tunnel is a high-temperature, high-speed airflow outlet.

[0047] like Figure 2 As shown, three model supports 5 are fixed to the end face holes 1-1 of the mounting plates 1-2 of the rotating disk 1 via rotating shafts 5-1, and can rotate around the rotating shafts 5-1. Models 5-2 are placed inside the square cavities of the model supports 5, remaining flush with the surface. One of the model supports 5 is positioned at the exact center of the arc wind tunnel nozzle outlet 9, undergoing ablation testing by high-temperature, high-speed airflow. The model supports 5 change their angle of attack by rotating around the rotating shafts 5-1 to adjust the testing conditions.

[0048] like Figure 3 As shown, the push-pull slip ring 6 is threaded onto the rotating shaft 2. Three limiting blocks evenly distributed at 120° intervals in the inner hole are engaged with three elongated holes evenly distributed at 120° intervals in the rotating shaft 2, thus restricting the push-pull slip ring 6 to only perform linear reciprocating motion along the rotating shaft 2. One end of the connecting hole at both ends of the support rod 7 is connected to the connecting hole 5-3 on the back of the model bracket 5, and the other end is connected to the three hanging point holes 6-1 evenly distributed at 120° intervals on the outer side of the push-pull slip ring 6. The linear reciprocating motion of the slip ring 6 can be converted into the rotation of the model bracket 5 around the rotating shaft 5-1.

[0049] The rotating shaft 2 penetrates the rotating disc through the shaft hole, and is finally connected with the base 8 at one end, and penetrates the push-pull ring 6 and the inner hole of the electric rotating disc 4 and is finally connected with another base 8 at the other end. The ball screw and screw nut of the electric push-pull rod 4 are deeply inserted into the inner hole of the rotating shaft 2, and the servo motor is fixed on the end face of the rotating shaft 2 through a flange. The push-pull sliding ring 6 is sleeved on the rotating shaft 3, and is fixed with the screw nut through the long strip holes uniformly distributed in 120 degrees on the side wall surface of the rotating shaft 3 through fasteners, so that the electric push-pull rod 4 can convert the rotation of the servo motor into the linear motion of the push-pull sliding ring 6 on the rotating shaft 2.

[0050] The electric rotating disc 4 is fixed on one side base 8, and the inner flange hole is connected with the rotating shaft 2. The low-speed large-torque rotation through the flange hole can replace the test model support 5 in the center of the arc wind tunnel nozzle outlet 9 to achieve the purpose of replacing the test model 5-2.

[0051] The test flow field is as follows: First, the equipment is placed in the test cabin, the relative position and attitude relative to the arc wind tunnel nozzle outlet are adjusted and fixed. In the test preparation stage, three models are installed into the square cavity of the model support, kept flush, and the first model of the rotating disc part is rotated to the center of the arc wind tunnel nozzle outlet through the electric rotating disc control. The test cabin is closed, vacuum is pumped, and after the vacuum degree meets the requirements, the valve is opened, and the high-temperature high-speed airflow is discharged from the center of the arc wind tunnel nozzle outlet to heat and test the 1# model. During the test process, the model support is rotated through the control of the electric push-pull rod, and the angle of attack of the model relative to the high-temperature high-speed airflow is adjusted.

[0052] After the 1# model completes the test, the 2# model of the rotating disc part is rotated to the center of the arc wind tunnel nozzle outlet through the electric rotating disc control, and the test of the second model is started. This cycle is repeated until the test of the three models is completed. The valve is closed, the vacuum is released, the test cabin is opened, the model is replaced, and the equipment is checked, and the next round of test is started.

[0053] The present application can complete the test of three models in one test preparation, greatly improving the test efficiency; the present application can switch models after or during the test, and has high flexibility; the present application realizes accurate adjustment of the angle of attack of the model through the electric push-pull rod and the push-pull sliding ring, and the test conditions are controllable.

[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A three-mode rotating support operating under arc wind tunnel conditions, characterized in that, include: The rotating disk has three mounting pieces evenly arranged around its outer ring, and each mounting piece has a mounting hole at its end. Three model supports, each of which is rotatably mounted on the mounting hole via a pivot; A rotating shaft is fixedly connected to the center of the rotating disk; An electric turntable, with its drive end connected to the rotating shaft, is used to drive the rotating shaft and the turntable to rotate together, so as to switch any of the model supports to the assessment station in front of the arc wind tunnel nozzle outlet; An electric push-pull rod is located inside the rotating shaft; A push-pull slip ring is sleeved on the outside of the rotating shaft and connected to the output end of the electric push-pull rod. Under the drive of the electric push-pull rod, it moves linearly along the axial direction of the rotating shaft. A support rod, one end of which is hinged to the back of the model support, and the other end of which is hinged to the push-pull slip ring; The linear motion of the push-pull slip ring is converted into the rotational motion of the model support about its axis through the support rod, thereby adjusting the angle of attack of the model mounted on the model support relative to the airflow.

2. The three-mode rotating support operating under arc wind tunnel conditions according to claim 1, characterized in that, The three mounting plates of the rotating disk are evenly distributed at 120°.

3. The three-mode rotating support operating under arc wind tunnel conditions according to claim 1, characterized in that, The rotating shaft is a hollow tubular shaft, and at least one elongated hole is provided on the side wall of the rotating shaft along the axial direction; the inner wall of the push-pull slip ring is provided with a limiting block, which is embedded in the elongated hole to restrict the push-pull slip ring from moving along the axial direction of the rotating shaft.

4. The three-mode rotating support operating under arc wind tunnel conditions according to claim 3, characterized in that, There are three elongated holes on the side wall of the rotating shaft, which are evenly distributed 120° around the circumference; there are three corresponding limiting blocks on the inner wall of the push-pull slip ring.

5. The three-mode rotating support operating under arc wind tunnel conditions according to claim 1, characterized in that, The electric push-pull rod includes a servo motor, a ball screw, and a screw nut sleeved on the ball screw; the servo motor drives the ball screw to rotate, causing the screw nut to move linearly; the screw nut is fixedly connected to the push-pull slip ring.

6. The three-mode rotating support operating under arc wind tunnel conditions according to claim 1, characterized in that, The model support has a rectangular parallelepiped structure, with a square cavity in the middle for accommodating the model. When the model is installed in the square cavity, the test surface of the model is flush with the outer surface of the model support.

7. The method of using the three-mode rotating support operating under arc wind tunnel conditions according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Install the three models to be evaluated onto the three model supports respectively; S2: By controlling the rotation of the electric turntable, the first model support is rotated and positioned at the assessment station directly in front of the outlet of the electric arc wind tunnel nozzle; S3: Seal the test chamber and perform a vacuuming operation; S4: Open the valve of the electric arc wind tunnel to allow the high-temperature, high-speed airflow to perform ablation testing on the model located at the test station. S5: During the assessment, the electric push-pull rod is controlled to drive the push-pull slip ring to move, and then the pitch angle of the model support is adjusted by the support rod to change the angle of attack of the model; S6: After the current model is assessed, control the electric turntable to rotate and switch the next model support to the assessment station. Repeat steps S4 and S5 until all three models are assessed.

8. The method of using the three-mode rotating support operating under arc wind tunnel conditions according to claim 7, characterized in that, In step S5, during a single assessment, the angle of attack of the model is continuously or in stages adjusted by the electric push-pull rod to simulate different flight attitudes for assessment.

9. The method of using the three-mode rotating support operating under arc wind tunnel conditions according to claim 7, characterized in that, In step S2, the servo motor of the electric turntable is used for precise angle control to ensure that the model support is accurately positioned.

10. The method of using the three-mode rotating support operating under arc wind tunnel conditions according to claim 7, characterized in that, After all models have been tested, the arc wind tunnel valves are closed, the vacuum in the test chamber is broken, and the test chamber door is opened to replace the model.

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