Flat plate type plume divergence angle testing device
By designing a flat-plate plume divergence angle test device, using a fixed distance collector to cover the plume range, the problem of time domain changes in the propulsion system plume divergence angle cannot be obtained in the prior art, and the continuous, rapid and Accurate inspection reduces costs.
Patent Information
- Application Number
- CN202421187322.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-29
AI Technical Summary
The current technology cannot obtain the time domain change process of the plume divergence angle of the propulsion system, mainly because the displacement platform dissipates poor heat in a vacuum environment and is difficult to work for a long time, which limits the continuous time of the test, and thus cannot obtain the time domain of the plume divergence angle. change.
A flat-plate plume divergence angle test device is designed, including a thruster and a plume collector. The collector consists of a collector and an insulating plate. The acquisition of the collector is facing the thruster, the central axis and the plume of the thruster The central axis is coaxial, maintaining a preset fixed distance to cover the plume range, enabling continuous detection of plume divergence angle without a displacement platform.
The continuous detection of the time domain change of plume divergence angle in the propulsion system is achieved, and the problem of the time domain change of plume divergence angle cannot be obtained due to the displacement platform movement scanning time limit, and the cost is low and the structure is simple.
Smart Images
Figure CN222528935U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thruster measurement, in particular to a flat-plate type plume divergence angle testing device. Background Art
[0002] Space electric propulsion technology is widely used in various space missions due to its high specific impulse and high thrust stability. The thruster plume refers to the plasma flow ejected by the electric thruster. These plumes have an important impact on the performance of the spacecraft and the surrounding environment. Understanding and measuring the characteristics of the electric propulsion plume is crucial to optimizing the thruster design, improving the efficiency of the propulsion system and reducing the potential impact on the spacecraft and its surrounding equipment. Among them, the plume divergence angle is an important indicator for evaluating the efficiency of the electric propulsion system. The measurement of the plume divergence angle has important guiding significance for designing the control algorithm of the propulsion system and improving the thruster structure.
[0003] At present, the commonly used method for testing the plume divergence angle is to use a platform with a displacement function and load a Faraday probe to scan the plume area. This method is highly dependent on the displacement platform mechanism. However, the use of the displacement platform mechanism will make it impossible to obtain the time domain variation process of the plume divergence angle of the propulsion system. Specifically, the heat dissipation of the displacement platform motor is poor when working in a vacuum environment, and it is difficult to work for a long time, which limits the continuous test time of the plume divergence angle test. Due to the limitation of the displacement platform movement scanning time, the time domain variation process of the plume divergence angle of the propulsion system cannot be obtained.
[0004] Therefore, it is of practical value to study a test device that can obtain the time domain variation process of the propulsion system plume divergence angle. Utility Model Content
[0005] The utility model aims to provide a flat-plate plume divergence angle testing device to solve the problem in the prior art that the time domain variation process of the plume divergence angle of a propulsion system cannot be obtained.
[0006] In order to solve the above technical problems, the utility model provides a flat-plate plume divergence angle testing device, comprising a propeller and a plume collector; the propeller is used to generate a plume; the plume collector comprises a collecting piece and an insulating plate; the collecting piece is arranged on the insulating plate, the collecting surface of the collecting piece is aligned with the propeller, the central axis of the collecting surface of the collecting piece is coaxially arranged with the central axis of the plume of the propeller, a preset fixed distance is maintained between the collecting piece and the propeller, and the preset fixed distance is used to make the collecting surface of the collecting piece cover the plume range.
[0007] In one embodiment, the collecting member includes a plurality of first collecting electrodes and a plurality of second collecting electrodes; the plurality of first collecting electrodes are arranged circumferentially to form a collecting circle; the plurality of second collecting electrodes are disposed within the collecting circle, and the plurality of second collecting electrodes are arranged regularly.
[0008] In one embodiment, a plurality of the first collecting electrodes are evenly arranged.
[0009] In one embodiment, a plurality of the second collecting poles are linearly and evenly arranged along the diameter direction of the collecting circle.
[0010] In one embodiment, the first collecting electrodes are provided at both ends of the diameter on which the second collecting electrodes are provided.
[0011] In one embodiment, the distance between adjacent first collecting electrodes and / or second collecting electrodes is greater than 5 mm to 100 mm.
[0012] In one embodiment, the diameters of the first collecting electrode and the second collecting electrode are the same.
[0013] In one of the embodiments, the plume collector further comprises a plume mounting platform; the plume mounting platform is provided with a mounting through hole, the insulating plate is fixedly mounted in the mounting through hole, and the collecting member is arranged outward.
[0014] In one of the embodiments, it further comprises a connecting piece, on which the propeller and the plume collector are detachably mounted.
[0015] In one embodiment, the connecting member is a screw; the propeller is screwed to one end of the screw, and the plume collector is screwed to the other end of the screw.
[0016] The beneficial effects of the utility model are as follows:
[0017] Since the plume collector includes a collecting piece and an insulating plate; the collecting piece is arranged on the insulating plate, the collecting surface of the collecting piece is aligned with the thruster, the central axis of the collecting surface of the collecting piece is arranged colinearly with the central axis of the plume of the thruster, and a preset fixed distance is maintained between the collecting piece and the thruster, and the preset fixed distance is used to make the collecting surface of the collecting piece cover the plume range. Therefore, after the collecting piece and the thruster are kept fixed and on the same axis, the collecting surface can cover the plume range, and continuous detection of the time domain change of the propulsion system plume divergence angle can be achieved without any displacement platform mechanism, which completely solves the problem of being unable to obtain the time domain change process of the propulsion system plume divergence angle due to the limitation of the displacement platform movement scanning time. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 It is a schematic diagram of the overall structure provided by the preferred embodiment of the utility model;
[0020] Figure 2 It is a schematic diagram of the structure of the plume collector provided by the preferred embodiment of the utility model;
[0021] Figure 3 It is a schematic diagram of the arrangement of the collecting poles provided in the preferred embodiment of the utility model.
[0022] The reference numerals are as follows:
[0023] 1. Propeller; 2. Plume collector; 20. Collecting piece; 200. First collecting pole; 201. Second collecting pole; 21. Insulating plate; 22. Plume mounting platform; 3. Connecting piece. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0025] At present, the commonly used method for testing the plume divergence angle is to use a platform with a displacement function and load a Faraday probe to scan the plume area. This method is highly dependent on the displacement platform mechanism. However, the use of the displacement platform mechanism will make it impossible to obtain the time domain variation process of the plume divergence angle of the propulsion system. Specifically, the heat dissipation of the displacement platform motor is poor when working in a vacuum environment, and it is difficult to work for a long time, which limits the continuous test time of the plume divergence angle test. Due to the limitation of the displacement platform movement scanning time, the time domain variation process of the plume divergence angle of the propulsion system cannot be obtained.
[0026] In order to solve the above problems, this solution provides a flat-plate plume divergence angle test device, please refer to Figures 1 to 3 , including a propeller 1 and a plume collector 2; the propeller 1 is used to generate a plume; the plume collector 2 includes a collecting piece 20 and an insulating plate 21; the collecting piece 20 is arranged on the insulating plate 21, the collecting surface of the collecting piece 20 is aligned with the propeller 1, the central axis of the collecting surface of the collecting piece 20 is coaxially arranged with the central axis of the plume of the propeller 1, and a preset fixed distance is maintained between the collecting piece 20 and the propeller 1, and the preset fixed distance is used to make the collecting surface of the collecting piece 20 cover the plume range.
[0027] Among them, the above-mentioned preset fixed distance, that is, Figure 1In L, the preset fixed distance is mainly selected according to the system power of the thruster 1. The method for determining the preset fixed distance is as follows: when the collection edge of the collection member 20 does not collect the plume signal, it can be determined as a suitable preset fixed distance.
[0028] It should be pointed out that the central axis of the collection surface is Figure 1 The line L in Figure 2 The axis perpendicular to the center of the insulating plate 21. Of course, the above-mentioned illustrations of the collection surface are all regular figures. When the collection surface is an irregular figure, the center of the largest regular figure in the irregular figure is taken as the point, and the axis perpendicular to the center is the central axis of the collection surface.
[0029] After adopting this setting method, the present scheme includes at least the following advantages: first, the acquisition surface can cover the plume range, so that it does not rely on the displacement mechanism, and can continuously detect the plume divergence angle information of the thruster 1 in a vacuum environment without being limited by the scanning time, and can obtain the plume divergence angle information when the propulsion system operating conditions are switched (i.e., the time domain change of the plume divergence angle); second, the present scheme only includes a simple mechanical structure and sampling circuit, which is low in cost and easy to operate.
[0030] Regarding the above-mentioned plume collector 2, as Figure 2 and Figure 3 As shown, the plume collector 2 includes a plume mounting platform 22, a collecting member 20 and an insulating plate 21. The plume mounting platform 22 is provided with a mounting through hole, the insulating plate 21 is fixedly mounted in the mounting through hole, and the collecting member 20 is arranged outward.
[0031] For the collection part 20, if Figure 2 and Figure 3 As shown, the collecting member 20 includes a plurality of first collecting electrodes 200 and a plurality of second collecting electrodes 201; the plurality of first collecting electrodes 200 are arranged circumferentially to form a collecting circle; the plurality of second collecting electrodes 201 are arranged in the collecting circle, and the plurality of second collecting electrodes 201 are arranged regularly. After adopting this arrangement, the first collecting electrodes 200 and the plurality of second collecting electrodes 201 jointly form a collecting surface, and the first collecting electrodes 200 located at the edge of the collecting circle are used to determine whether the preset fixed distance is appropriate, that is, when the plume signal collected by the first collecting electrode 200 is 0, it can be determined to be an appropriate preset fixed distance; and the second collecting electrodes 201 located in the collecting circle are used to collect plume divergence angle information.
[0032] Furthermore, in order to ensure the charge shielding effect, Figure 2 and Figure 3 As shown, the distance between adjacent first collecting electrodes 200 and / or second collecting electrodes 201 is 5 mm to 100 mm, which is a distance in the range of Debye length. When the distance between adjacent collecting electrodes is greater than the Debye length, charge shielding can be ensured. The derivation of the Debye length is as follows:
[0033] Assume that the electron temperature of the space electric propulsion system is 2eV~50eV and the electron density is 10 16 m- 3 -10 19 m- 3 , according to the Debye length calculation formula:
[0034]
[0035] Where ε0 is the dielectric constant of vacuum, k B is the Boltzmann constant, Te is the electron temperature, ne is the electron density, and e is the electron charge. Therefore, the maximum range of the Debye length is 5 mm. Therefore, it is sufficient to ensure that the distance between adjacent first collectors 200 and / or second collectors 201 is greater than 5 mm.
[0036] Furthermore, in order to accurately determine the preset fixed distance, such as Figure 2 and Figure 3 As shown, a plurality of first collecting electrodes 200 are evenly arranged. After adopting this arrangement, the first collecting electrodes 200 are evenly arranged on the circumference of the collecting circle. When a plume diverges to the edge of the collecting circle, there are adjacent first collecting electrodes 200 on the edge of the collecting circle to collect the plume information.
[0037] Preferably, the number of the plurality of first collecting electrodes 200 is 6, and the 6 first collecting electrodes 200 are evenly arranged around the collecting circle, wherein two first collecting electrodes 200 are arranged on the diameter where the second collecting electrode 201 is provided, and for the remaining four first collecting electrodes 200, the distance between the two first collecting electrodes 200 on any side is 7.5 cm, and the distance between the first collecting electrode 200 and the second collecting electrode 201 is also 7.5 cm.
[0038] Furthermore, in order to accurately collect the plume divergence angle information, such as Figure 2 and Figure 3 As shown, along the diameter direction of the collection circle, multiple second collection electrodes 201 are linearly and evenly arranged, and both ends of the diameter of the second collection electrodes 201 are provided with first collection electrodes 200. After adopting this arrangement, multiple second collection electrodes 201 are evenly distributed in the collection circle. When the plume information flows to any angle θ, as shown in FIG. Figure 1 As shown, there is an adjacent second collecting pole 201 to collect plume information.
[0039] Preferably, the diameters of the second collecting electrodes 201 are kept vertical, the number of the second collecting electrodes 201 is 5, and the spacing between the second collecting electrodes 201 is 2.5 cm, that is, 5 times the Debye length is the spacing distance between metal electrodes.
[0040] Furthermore, in order to achieve uniform collection of plume divergence angle information, such as Figure 2 and Figure 3 As shown, the diameter length of the first collecting electrode 200 and the second collecting electrode 201 are the same, preferably 1 cm, and the collecting materials of the first collecting electrode 200 and the second collecting electrode 201 are the same, preferably copper. Of course, other materials that can realize plume information collection can be used by technicians in this field according to their actual needs.
[0041] For the insulating plate 21, if Figure 2 and Figure 3 As shown, the insulating plate 21 is provided with collecting mounting holes corresponding to the number of collecting poles, that is, the sum of the number of first collecting poles 200 and the number of second collecting poles 201. The material of the insulating plate 21 includes but is not limited to glass fiber, and technicians in this field can choose according to their actual needs.
[0042] For the plume mounting station 22, if Figure 2 and Figure 3 As shown, the plume mounting platform 22 is composed of an aluminum plate with a side length of 20 cm, and the diameter of the mounting through hole on the plume mounting platform 22 is preferably a 16 cm circular hole.
[0043] In order to facilitate the determination of the preset fixed distance, such as Figure 1 As shown, it also includes a connecting member 3, on which the propeller 1 and the plume collector 2 are detachably mounted. After adopting this setting method, the connecting member 3 can adjust the relative positions of the propeller 1 and the plume collector 2, thereby adjusting the preset fixed distance.
[0044] Specifically, Figure 1 As shown, the connecting member 3 is preferably a screw; the propeller 1 is screwed to one end of the screw, and the plume collector 2 is screwed to the other end of the screw. After adopting this setting method, the user screws the propeller 1 or the plume collector 2 through the screw to adjust the preset fixed distance between the two, thereby achieving the collection surface covering the plume range.
[0045] To summarize the advantages of this scheme, first, the structure is simple, and a simple mechanical mechanism is used to complete the measurement of the plume divergence angle of the space electric propulsion system; second, there is no need for a displacement platform. Compared with the probe-type test device with a displacement platform, it has the advantages of being continuous, fast and accurate, and can realize continuous detection of the time domain changes of the propulsion system plume divergence angle, which completely solves the problem of being unable to obtain the time domain change process of the propulsion system plume divergence angle due to the limitation of the displacement platform movement scanning time; third, the cost is low.
[0046] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.
Claims
1. A flat-plate plume divergence angle test device, characterized in that: include thrusters and plume collectors; The propeller is used to generate a plume; The plume collector comprises a collecting member and an insulating plate; The collecting member is arranged on the insulating plate, the collecting surface of the collecting member is aligned with the propeller, the central axis of the collecting surface of the collecting member is coaxially arranged with the central axis of the plume of the propeller, and a preset fixed distance is maintained between the collecting member and the propeller, and the preset fixed distance is used to make the collecting surface of the collecting member cover the range of the plume.
2. The flat-plate plume divergence angle test device according to claim 1, characterized in that: The collecting member comprises a plurality of first collecting electrodes and a plurality of second collecting electrodes; A plurality of said first collecting poles are arranged circumferentially to form a collecting circle; A plurality of the second collecting electrodes are disposed in the collecting circle, and the plurality of the second collecting electrodes are arranged regularly.
3. The flat-plate plume divergence angle testing device according to claim 2, characterized in that: The plurality of first collecting electrodes are evenly arranged.
4. The flat-plate plume divergence angle testing device according to claim 2, characterized in that: Along the diameter direction of the collection circle, a plurality of the second collection poles are linearly and evenly arranged.
5. The flat-plate plume divergence angle testing device according to claim 4, characterized in that: The first collecting electrodes are arranged at both ends of the diameter where the second collecting electrodes are arranged.
6. The flat-plate plume divergence angle testing device according to claim 2, characterized in that: The distance between adjacent first collecting electrodes and / or second collecting electrodes is greater than 5 mm to 100 mm.
7. The flat-plate plume divergence angle testing device according to claim 2, characterized in that: The diameters of the first collecting electrode and the second collecting electrode are the same.
8. The flat-plate plume divergence angle testing device according to claim 1, characterized in that: The plume collector also includes a plume mounting platform; The plume mounting platform is provided with a mounting through hole, the insulating plate is fixedly mounted in the mounting through hole, and the collecting member is arranged outward.
9. The flat-plate plume divergence angle testing device according to claim 1, characterized in that: It also includes a connecting piece, on which the propeller and the plume collector are detachably mounted.
10. The flat-plate plume divergence angle testing device according to claim 9, characterized in that: The connecting piece is a screw; The propeller is screwed to one end of the screw rod, and the plume collector is screwed to the other end of the screw rod.