A method for feeding a stationary model into a support structure.

Abstract

This invention provides a stagnation model feeding bracket and feeding method, including a water-cooled support arm, a transfer bearing component, a rotary feeding mechanism, and a host computer control system. One end of the transfer bearing component is fixedly connected to the output shaft of the rotary feeding mechanism, and the other end of the transfer bearing component is provided with a polygonal connector for mounting multiple water-cooled support arms. The stagnation model is fixedly mounted on the end of the water-cooled support arm away from the transfer bearing component. Both the water-cooled support arm and the transfer bearing component have lead wire channels for connecting various sensors on the stagnation model. The host computer control system controls the rotary feeding mechanism to drive the rotation of the transfer bearing component, thereby causing the polygonal connector to rotate at a certain angle, sequentially rotating multiple water-cooled support arms with stagnation models mounted to the nozzle position. This allows for the acquisition of multiple flow field parameters or the ablation assessment of multiple stagnation models in a single experiment, greatly improving experimental efficiency and reducing the workload of operators.

Description

Technical Field

[0001] This invention relates to the field of supersonic free jet stagnation point testing technology, and in particular to a stagnation point model feeding support and feeding method. Background Technology

[0002] Supersonic free jet stagnation test technology is an important research method for evaluating the performance of heat-resistant materials. The heater heats pure air to tens of thousands of degrees Celsius and accelerates it through a Laval nozzle. The test model, designed as a cylindrical ball head stagnation point, is then subjected to ablation test to examine, evaluate and verify the heat insulation performance of the heat-resistant material.

[0003] A complete aerodynamic thermal test requires two processes: flow field calibration and formal ablation assessment. The formal ablation assessment begins when the heater operating parameters bring the flow field conditions within the required range. The model support is a crucial support structure for conducting aerodynamic thermal tests. Its function is to move and hold the test model and experimental model at a certain distance from the nozzle exit. As an important support tool for the model, it accompanies the entire test process and influences the complete experimental procedure.

[0004] Existing model supports such as Figure 1 As shown, the tail of the model is inserted into the support sleeve and fixed with screws. During the test, the heater is started, and after the flow field stabilizes, the model is quickly moved into the flow field using the upper cylinder mechanism to acquire flow field data. Then, different types of test models are replaced, and the above process is repeated multiple times until the heater operating parameters reach suitable flow field conditions. Each time a test model or formal test model is changed, the heater needs to be started and stopped. For aerodynamic thermal experiments conducted in a wind tunnel, there is also a process of vacuum pumping within the wind tunnel. For experiments with multiple flow field states and a large number of models, repeated heater start-ups and shutdowns and vacuum pumping are required. Multiple heater start-ups and shutdowns significantly reduce the lifespan of the heater, and the repeated vacuum pumping within the wind tunnel wastes a large amount of energy. Frequent model changes also significantly reduce experimental efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a support and method for feeding stationary models, overcoming the shortcomings of existing support systems that require frequent model replacement, and providing a support system that can install and feed multiple stationary models.

[0006] This invention provides a stationary model feeding support, including a water-cooled support arm, a transfer bearing component, a rotary feeding mechanism, and a host computer control system. The rotary feeding mechanism is electrically connected to the host computer control system. One end of the transfer bearing component is fixedly connected to the output shaft of the rotary feeding mechanism, and the other end of the transfer bearing component is provided with a polygonal connector. Multiple water-cooled support arms are sequentially fixedly installed on the side of the polygonal connector. The stationary model is fixedly installed on the end of the water-cooled support arm away from the transfer bearing component. Lead wire channels for connecting various sensors on the stationary model are opened inside both the water-cooled support arm and the transfer bearing component.

[0007] Furthermore, the polygonal connector is a hollow pentagonal or hexagonal prism structure.

[0008] Furthermore, the water-cooled support arm includes a first connector, an angled water-cooled support, and a model sleeve for mounting the stationary model. The first connector is fixedly connected to the side of the polygonal connector. One end of the angled water-cooled support is welded to the first connector, and the other end of the angled water-cooled support is welded to the model sleeve. The interior of the angled water-cooled support has two cooling water channels along its length, and both cooling water channels communicate with the interior of the model sleeve. The first connector has an inlet and an outlet that communicate with the two cooling water channels respectively.

[0009] Furthermore, the model sleeve includes a cylindrical body and an outer sleeve welded to the outside of the cylindrical body. The cylindrical body has an internal cavity for mounting the stationary model. A sealed space is formed between the cylindrical body and the outer sleeve, which communicates with two cooling water channels. A metal conduit is installed inside one of the cooling water channels, and the metal conduit communicates with the cavity.

[0010] Furthermore, temperature and pressure sensors are installed on the stationary model.

[0011] Furthermore, both the angled water-cooled support and the outer sleeve are made of copper.

[0012] Furthermore, the angled water-cooled support is inclined relative to the first connector.

[0013] Furthermore, the rotary feeding mechanism is a servo motor.

[0014] Furthermore, the connecting load-bearing component includes a hollow steel pipe and the polygonal connector. One end of the hollow steel pipe is fixedly connected to the polygonal connector, and the other end of the hollow steel pipe is fixedly connected to the output shaft of the servo motor.

[0015] A method for feeding in a stationary model specifically includes the following steps:

[0016] S1: Install the stationary model into the support, so that the axis of the model sleeve at the front end of any water-cooled support arm is parallel to the nozzle axis;

[0017] S2: The upper computer control system controls the rotary feeding mechanism to rotate the polygonal connector until the angle bisector between any two adjacent water-cooled support arms intersects the nozzle axis. This angle bisector is coplanar with and perpendicular to the nozzle axis. This position is taken as the system zero position.

[0018] S3: Start the heater. After the flow field stabilizes, use the rotating feeding mechanism to drive the polygonal connector to rotate clockwise and send the stagnation model to the nozzle outlet for testing or ablation assessment.

[0019] S4: After all models have completed the test in sequence, turn off the heater and start the rotary feeding mechanism to restore the polygonal connector to the system zero position described in step S2.

[0020] The advantages of the technical solution of the present invention compared with the prior art are as follows: the upper computer control system controls the rotary delivery mechanism to drive the rotation of the transfer bearing component, thereby causing the polygonal connector to rotate at a certain angle, and rotating multiple water-cooled support arms with stagnation models installed in sequence to the nozzle position. Thus, multiple flow field parameters can be obtained or multiple stagnation models can be ablated in one test. There is no need to repeatedly start and stop the heater and vacuum pump the wind tunnel, which greatly improves the test efficiency and reduces the workload of the operators. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a traditional feed-in stent;

[0023] Figure 2 This is a schematic diagram of the structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the disassembled structure of the water-cooled support arm in this invention;

[0025] Explanation of reference numerals in the attached drawings: 1-Water-cooled support arm, 101-First connector, 102-Angled water-cooled support, 103-Cylinder, 104-Outer sleeve, 105-Metal conduit, 2-Polygonal connector, 3-Rotating delivery mechanism, 4-Host computer control system, 5-Cylinder, 6-Stationary model, 7-Support sleeve. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Example 1

[0030] like Figures 2-3As shown, a stationary model feeding support includes a water-cooled support arm 1, a transfer bearing component, a rotary feeding mechanism 3, and a host computer control system 4. The rotary feeding mechanism 3 is a servo motor, which is electrically connected to the host computer control system 4. The host computer control system 4 controls the rotation of the motor. The host computer control system 4 includes a computer and a controller. During operation, the computer inputs control commands, and then the controller controls the rotation of the servo motor.

[0031] The load-bearing adapter includes a hollow steel pipe and a polygonal connector 2. One end of the hollow steel pipe is fixedly connected to the output shaft of the servo motor, and the other end is fixedly connected to the polygonal connector 2. Multiple water-cooled support arms 1 are sequentially fixedly installed on the sides of the polygonal connector 2. The polygonal connector 2 is a hollow pentagonal or hexagonal prism structure. In this embodiment, a hexagonal prism structure is preferred. Each side of the hexagonal prism is fixedly fitted with a water-cooled support arm 1 by screws. The specific structure of the polygonal connector 2 can be flexibly selected according to the actual operating space and test conditions, and can be a regular polygonal prism structure with 3-8 sides.

[0032] The water-cooled support arm 1 includes a first connector 101, an angled water-cooled support 102, and a model sleeve for mounting the stationary model. The first connector 101 is fixedly connected to the side of the polygonal connector 2 by screws. One end of the angled water-cooled support 102 is welded to the first connector 101, and the other end of the angled water-cooled support 102 is welded to the model sleeve. Two cooling water channels are opened inside the angled water-cooled support 102 along its length. The first connector 101 has an inlet and an outlet that are respectively connected to the two cooling water channels. The model sleeve includes a cylinder 103 and an outer sleeve 104 welded to the outside of the cylinder 103. The cylinder 103 has a cavity for mounting the stationary model. A sealed space is formed between the cylinder 103 and the outer sleeve 104 that is connected to the two cooling water channels, forming a cooling water circulation loop.

[0033] Both the water-cooled support arm 1 and the transition load-bearing component have lead wire channels for connecting various sensors on the stationary model. Temperature and pressure sensors are installed on the stationary model, and their leads are led out through these lead wire channels to electrically connect to the controller, feeding back electrical signals. Specifically, a metal conduit 105 is installed inside one of the cooling water channels within the angled water-cooled support component 102. The metal conduit 105 communicates with the receiving cavity and serves as a lead wire channel for connecting the sensor wiring harness. The metal conduit 105 isolates the wiring harness from the cooling water. The cross-sectional area of ​​the metal conduit 105 is smaller than that of the cooling water channel, so it does not affect the normal circulation of the cooling water.

[0034] The angled water-cooled support 102 has a rhomboid cross-sectional shape and is made of copper. The excellent thermal conductivity of copper can effectively prevent the parts of the angled water-cooled support 102 exposed to the high-temperature flow field from burning due to heat accumulation. The width of the short side of the angled water-cooled support 102 does not exceed the diameter of the outer sleeve 104 to reduce the interference of the entire feed support on the flow field. At the same time, the angled water-cooled support 102 is inclined relative to the first connector 101 and installed at an angle, which not only ensures the structural strength but also further reduces the interference of the feed support on the flow field.

[0035] The outer sleeve 104 is made of copper. During processing and assembly, it is cut in half along the symmetrical face and then welded to the cylinder 103.

[0036] All parts not specifically mentioned in this invention are made of stainless steel to ensure sufficient structural strength and corrosion resistance.

[0037] A feeding control method for a stationary model feeding support includes the following steps, using a polygonal connector 2 in the shape of a regular hexagonal prism as an example to illustrate the feeding control method:

[0038] (1) During the system preparation stage, install the stationary model into the support, so that the axis of any model sleeve is parallel to the nozzle axis and the front end of the model sleeve is kept at the required distance from the nozzle outlet.

[0039] (2) In the system zero position stage, adjust the host computer control system 4 and drive the polygonal connector 2 to rotate through the servo motor until the angle bisector between any two adjacent water-cooled support arms 1 intersects with the nozzle axis. This position is taken as the system zero position.

[0040] (3) In the initial working stage of the system, start the heater. After the flow field stabilizes, drive the polygonal connector 2 to rotate 30° clockwise through the servo motor so that the first stationary model is rotated to the nozzle outlet position and the initial model test or ablation assessment begins.

[0041] (4) During the continuous working phase, after the initial position test or ablation is completed, rotate 60° clockwise to make the next water-cooled support arm drive the stationary model to rotate to the nozzle outlet position, and continue the model test or ablation assessment until all stationary models on the polygonal connector 2 have completed the test in sequence.

[0042] (5) At the end of the test, turn off the heater and start the servo motor to restore the polygonal connector 2 to the system zero position defined in step (2).

[0043] Traditional model supports, such as Figure 1As shown, after the stagnation model 6 is inserted into the support sleeve 7, the single stagnation model 6 is transferred to the flow field by the cylinder 5. The technical solution of this application addresses the shortcomings of the prior art by rotating the polygonal connector 2 at a certain angle, thereby rotating multiple water-cooled support arms 1 with stagnation models installed in sequence to the nozzle position. This allows multiple flow field parameters to be obtained or multiple stagnation models to be ablated in one test, eliminating the need for repeated heater start-up and shutdown and vacuum extraction, which greatly improves test efficiency and reduces the workload of operators.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for feeding a stationary model into a support frame, characterized in that, The device includes a water-cooled support arm, a transfer bearing component, a rotary feeding mechanism, and a host computer control system. The rotary feeding mechanism is electrically connected to the host computer control system. One end of the transfer bearing component is fixedly connected to the output shaft of the rotary feeding mechanism, and the other end of the transfer bearing component is provided with a polygonal connector. Multiple water-cooled support arms are sequentially fixedly installed on the side of the polygonal connector. The stationary point model is fixedly installed on the end of the water-cooled support arm away from the transfer bearing component. Lead wire channels for connecting various sensors on the stationary point model are opened inside both the water-cooled support arm and the transfer bearing component. The water-cooled support arm includes a first connector, an angled water-cooled support, and a model sleeve for mounting the stationary model. The angled water-cooled support has a rhomboid cross-sectional shape. The first connector is fixedly connected to the side of the polygonal connector. One end of the angled water-cooled support is welded to the first connector, and the other end of the angled water-cooled support is welded to the model sleeve. The interior of the angled water-cooled support has two cooling water channels along its length. Both cooling water channels are connected to the interior of the model sleeve. The first connector has an inlet and an outlet that are respectively connected to the two cooling water channels. The model sleeve includes a cylindrical body and an outer sleeve welded to the outside of the cylindrical body. The cylindrical body has an internal cavity for mounting the stationary model. A sealed space is formed between the cylindrical body and the outer sleeve, which communicates with two cooling water channels. A metal conduit is installed inside one of the cooling water channels, and the metal conduit communicates with the cavity. The angled water-cooled support is inclined relative to the first connector.

2. The stationary model feeding support according to claim 1, characterized in that, The polygonal connector is a hollow pentagonal or hexagonal prism structure.

3. The stationary model feeding support according to claim 1, characterized in that, The stationary model is equipped with temperature and pressure sensors.

4. The stationary model feeding support according to claim 1, characterized in that, Both the angled water-cooled support and the outer sleeve are made of copper.

5. The stationary model feeding support according to claim 1, characterized in that, The rotary feeding mechanism is a servo motor.

6. The stationary model feeding support according to claim 5, characterized in that, The connecting load-bearing component includes a hollow steel pipe and the polygonal connector. One end of the hollow steel pipe is fixedly connected to the polygonal connector, and the other end of the hollow steel pipe is fixedly connected to the output shaft of the servo motor.

7. A method for feeding a stationary model, characterized in that, Specifically, the following steps are included: S1: Install the stationary model feeding bracket as described in any one of claims 1-6, so that the axis of the model sleeve at the front end of any water-cooled support arm is parallel to the nozzle axis; S2: The upper computer control system controls the rotary feeding mechanism to rotate the polygonal connector until the angle bisector between any two adjacent water-cooled support arms intersects the nozzle axis. The angle bisector is coplanar with and perpendicular to the nozzle axis. The position of the polygonal connector at this time is taken as the system zero position. S3: Start the heater. After the flow field stabilizes, use the rotating feeding mechanism to drive the polygonal connector to rotate clockwise and send the stagnation model to the nozzle outlet for testing or ablation assessment. S4: After all models have completed the test in sequence, turn off the heater and start the rotary feeding mechanism to restore the polygonal connector to the system zero position described in step S2.

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