Device for evaluating performance of self-neutralization ionic liquid thruster

Abstract

The utility model relates to the technical field of test equipment, and particularly discloses a device for evaluating the performance of a self-neutralization ionic liquid thruster, which comprises a first assembly frame, a second assembly frame, a first collection plate, a second collection plate, a transverse displacement platform and a current measurement device, the second assembly frame is assembled on the transverse displacement platform, and the transverse displacement platform is used for driving the second assembly frame to move transversely; the first assembling frame is opposite to the first collecting plate; the second collecting plate is parallel to the transverse displacement platform, and the first collecting plate and the second collecting plate are arranged side by side; the vertical distance between the first assembling frame and the first collecting plate is equal to the vertical distance between the second assembling frame and the second collecting plate. The first collecting plate and the second collecting plate are electrically connected with the current measuring device; the current measuring device is used for measuring the current of the first collecting plate and the second collecting plate; the device for evaluating the performance of the self-neutralization ionic liquid thruster can improve the development efficiency of the self-neutralization ionic liquid thruster and reduce the development cost.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a device for evaluating the performance of a self-neutralizing ionic liquid thruster. Background Art

[0002] As an electric propulsion system, ion liquid thrusters have the advantages of simple structure, high specific impulse, high working fluid density and low cost compared with Hall thrusters and ion thrusters, and have good development prospects. Ion liquid thrusters are based on the principle of electrospray, and form a charged beam through the potential difference between the extractor and the emitter to generate thrust.

[0003] The charged beam generated by the ionic liquid thruster during operation presents positive / negative polarity depending on the polarity of the power supply. On a spacecraft, the outer shell of the spacecraft is at a relatively low potential, and the charged beam is easily deposited on the surface of the spacecraft, changing the potential level of the outer shell, affecting the working performance of the load, and in severe cases, destructive arcs will occur, damaging the spacecraft.

[0004] Since ionic liquids only contain anions and cations, and the difference in molecular weight is small, self-neutralization can be achieved by alternately emitting anions and cations through two ionic liquid thrusters, that is, neutralizing the charged beam. This type of ionic liquid thruster is called a self-neutralizing ionic liquid thruster. The self-neutralization effect of the ionic liquid thruster is affected by the distance between the two thrusters. The neutralized beam is electrically neutral. How to evaluate the neutralization effect at different distances is one of the main difficulties in measuring the performance of self-neutralizing ionic liquid thrusters. Therefore, it is necessary to develop a device that can dynamically evaluate the corresponding neutralization effect under different distance parameters to meet the needs. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for evaluating the performance of a self-neutralizing ionic liquid thruster, which can evaluate the neutralization effect at different intervals and dynamically evaluate the neutralization effect corresponding to different size parameters, thereby improving the efficiency of the development of the self-neutralizing ionic liquid thruster and reducing the development cost.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A device for evaluating the performance of a self-neutralizing ionic liquid thruster comprises a first assembly frame, a second assembly frame, a first collecting plate, a second collecting plate, a lateral displacement platform and a current measuring device.

[0008] The second assembly rack is mounted on the lateral displacement platform, and the lateral displacement platform is used to drive the second assembly rack to lateral displacement.

[0009] The first assembly frame is opposite to the first collecting plate.

[0010] The second collecting plate is parallel to the lateral displacement platform, and the first collecting plate and the second collecting plate are arranged side by side.

[0011] A vertical distance between the first assembly rack and the first collecting plate is equal to a vertical distance between the second assembly rack and the second collecting plate.

[0012] The first collecting plate and the second collecting plate are both electrically connected to the current measuring device, and the current measuring device is used to measure the current of the first collecting plate and the second collecting plate.

[0013] The device for evaluating the performance of a self-neutralizing ionic liquid thruster provided by at least one embodiment of the present disclosure also includes a base.

[0014] The first assembly frame, the first collecting plate and the second collecting plate are all fixedly connected to the base.

[0015] The base is provided with a placement groove, the lateral displacement platform is placed in the placement groove, and the first assembly rack and the second assembly rack have the same height.

[0016] The first collecting plate and the second collecting plate are both perpendicular to the base.

[0017] In the device for evaluating the performance of a self-neutralizing ionic liquid thruster provided by at least one embodiment of the present disclosure, the lateral displacement platform is an electric displacement platform.

[0018] In the device for evaluating the performance of a self-neutralizing ionic liquid thruster provided by at least one embodiment of the present disclosure, both the first assembly frame and the second assembly frame include a positioning arm and a positioning seat.

[0019] The positioning arm is used to be connected to the extraction pole of the ionic liquid thruster, and the positioning seat is used to be connected to the emission pole of the ionic liquid thruster.

[0020] In the device for evaluating the performance of a self-neutralizing ionic liquid thruster provided by at least one embodiment of the present disclosure, two positioning arms are provided.

[0021] An installation cavity is formed between the two positioning arms for accommodating an emitter and an extractor of the ionic liquid thruster.

[0022] In the device for evaluating the performance of a self-neutralized ionic liquid thruster provided by at least one embodiment of the present disclosure, there is a gap between the first collecting plate and the second collecting plate.

[0023] In the device for evaluating the performance of a self-neutralized ionic liquid thruster provided by at least one embodiment of the present disclosure, the positioning arm is configured to be parallel to the base.

[0024] The device for evaluating the performance of a self-neutralizing ionic liquid thruster provided by at least one embodiment of the present disclosure also includes a high-voltage square wave pulse power supply for powering the emitter of the ionic liquid thruster.

[0025] The beneficial effects of the utility model are as follows: by continuously changing the distance between the two thrusters of the self-neutralizing ionic liquid thruster, the real neutralization effect of the emitted beam can be collected, and the neutralization effect corresponding to different size parameters can be dynamically evaluated, which can improve the efficiency of the development of the self-neutralizing ionic liquid thruster and reduce the development cost.

[0026] By setting up an electric displacement platform and two independent collecting plates to move an ionic liquid thruster, the neutralization effect of the self-neutralizing ionic liquid thruster at different thruster distances is evaluated. The structure can also measure the current, beam divergence angle and current distribution of a single thruster. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 The utility model is a three-dimensional diagram of a device for evaluating the performance of a self-neutralizing ionic liquid thruster.

[0029] Figure 2 Schematic diagram of the distribution of positioning arms and positioning seats.

[0030] Figure 3 This is a diagram of current signals collected from the first collecting plate and the second collecting plate when the distance between the first ionic liquid thruster and the second ionic liquid thruster changes.

[0031] Figure 4 This is a diagram of current signals collected from the first collecting plate and the second collecting plate when the distance between the first ionic liquid thruster and the second ionic liquid thruster changes.

[0032] Figure 5 This is a graph showing the relationship between the distance between the first ionic liquid thruster and the second ionic liquid thruster and the neutralization ratio.

[0033] Figure 6 This is a relationship diagram of the beam current of the second ionic liquid thruster deposited on the second collecting plate as the distance increases.

[0034] Figure 7 The radial distribution diagram of the current is obtained by cutting the beam deposited on the second collecting plate.

[0035] In the figure:

[0036] 10. First assembly frame; 11. Positioning arm; 12. Positioning seat;

[0037] 20. Second assembly rack;

[0038] 30. A first collecting plate;

[0039] 40. A second collecting plate;

[0040] 50. Lateral displacement platform;

[0041] 60. Base. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments.

[0043] Example

[0044] like Figure 1 and 2 As shown, a device for evaluating the performance of a self-neutralizing ionic liquid thruster includes a first assembly frame 10, a second assembly frame 20, a first collecting plate 30, a second collecting plate 40, a lateral displacement platform 50, a current measuring device (not shown), a base 60 and a high-voltage square wave pulse power supply (not shown).

[0045] Specifically, the second assembly frame 20 is assembled on the lateral displacement platform 50, and the lateral displacement platform 50 is used to drive the second assembly frame 20 to move lateraly, thereby adjusting the distance between the two ionic liquid thrusters.

[0046] Specifically, the first assembly rack 10 is opposite to the first collecting plate 30. The second collecting plate 40 is parallel to the lateral displacement platform 50, and the first collecting plate 30 and the second collecting plate 40 are arranged side by side. The vertical distance between the first assembly rack 10 and the first collecting plate 30 is equal to the vertical distance between the second assembly rack 20 and the second collecting plate 40. The first collecting plate 30 and the second collecting plate 40 are both electrically connected to the current measuring device, and the current measuring device is used to measure the current of the first collecting plate 30 and the second collecting plate 40.

[0047] Specifically, a high-voltage square wave pulse power supply is used to power the emitter of the ionic liquid thruster.

[0048] In this embodiment, the first assembly rack 10 , the first collecting plate 30 and the second collecting plate 40 are all fixedly connected to the base 60 .

[0049] Specifically, a placement groove is provided on the base 60 , and the lateral displacement platform 50 is placed in the placement groove. The first assembly rack 10 and the second assembly rack 20 have the same height. The first collection plate 30 and the second collection plate 40 are both perpendicular to the base 60 .

[0050] In this embodiment, the lateral displacement platform 50 is an electric displacement platform.

[0051] In this embodiment, the first assembly frame 10 and the second assembly frame 20 both include a positioning arm 11 and a positioning seat 12 .

[0052] Specifically, the positioning arm 11 is used to be connected to the extraction pole of the ionic liquid thruster, and the positioning seat 12 is used to be connected to the emission pole of the ionic liquid thruster.

[0053] Furthermore, two positioning arms 11 are provided. An installation cavity is formed between the two positioning arms 11, and the installation cavity is used to accommodate the emitter and the extractor of the ionic liquid thruster. The positioning arms 11 are configured to be parallel to the base 60.

[0054] In this embodiment, there is a gap between the first collecting plate 30 and the second collecting plate 40 .

[0055] The working method of the device for evaluating the performance of a self-neutralizing ionic liquid thruster in the embodiment will be disclosed below to further illustrate its principle.

[0056] When working, the emitter is connected to a high-voltage square wave pulse power supply of 8-16Hz, and the extractor is grounded. The ionic liquid forms an emission beam at the tip of the emitter under the action of the potential difference, and the beam forms an effective thrust through the middle hole of the extractor.

[0057] After the charged beam passes through the central hole of the extraction electrode, it is deposited on the first collecting plate 30 and the second collecting plate 40. The current measuring device measures the current of the two collecting plates in real time. If the emitted beam is completely neutralized, the beam is neutral and the current value is zero.

[0058] The second ionic liquid thruster is fixed on the second assembly frame 20, and the first collecting plate 30 and the second collecting plate 40 are both fixed. By starting the electric displacement platform, the second ionic liquid thruster can be laterally displaced, so that the first ionic liquid thruster and the second ionic liquid thruster are separated from each other, and the beam thereof is gradually deposited on the second collecting plate 40 from the state of being completely deposited on the first collecting plate 30 with the lateral displacement, and finally completely deposited on the second collecting plate 40.

[0059] When the first ionic liquid thruster and the second ionic liquid thruster are closest to each other, the beams of the two thrusters are deposited on the first collecting plate 30. At this time, the current of the collecting plate can characterize the degree of beam neutralization at this distance. When the second ionic liquid thruster moves laterally, the amount of its beam deposited on the second collecting plate 40 increases with the increase of the moving distance. According to the continuously changing current curve, the plume angle and current distribution of the beam emitted by the second ionic liquid thruster can be judged. When the beam of the second ionic liquid thruster is completely deposited on the second collecting plate 40, the current of the first collecting plate 30 and the second collecting plate 40 is equivalent to the independent current of the first ionic liquid thruster and the second ionic liquid thruster, which can be used to evaluate the volt-ampere characteristics of the two thrusters.

[0060] Experimental example

[0061] The first ionic liquid thruster and the second ionic liquid thruster are used to independently supply ionic liquid, and are respectively connected to two independent high-voltage square wave pulse power supplies, both of which have a frequency of 8 Hz, a phase difference of 180°, and a voltage range of ±1450V-±1950V.

[0062] The ionic liquid supply flow rate is 1.77 nL / s, and the extraction electrodes of the first ionic liquid thruster and the second ionic liquid thruster are both grounded.

[0063] The electric displacement platform is started, and the current signals of the first collecting plate and the second collecting plate are collected. The initial spacing between the first ionic liquid thruster and the second ionic liquid thruster is 21 mm. The second ionic liquid thruster is continuously moved by the electric displacement platform, so that the spacing between the second ionic liquid thruster and the first ionic liquid thruster changes from 21 mm to 56 mm at a constant speed, and then changes from 56 mm to 21 mm at a constant speed. The current of the first collecting plate and the second collecting plate is as follows: Figure 3 and 4 As shown, the right axis distance represents the movement distance of the electric displacement platform, and the initial spacing is 21 mm. As the spacing between the first ionic liquid thruster and the second ionic liquid thruster increases, the current of the first collecting plate and the second collecting plate gradually increases, and as the distance decreases, the current of the first collecting plate and the second collecting plate gradually decreases.

[0064] By counting the sum of the currents of the first collecting plate and the second collecting plate, the current neutralization ratio can be calculated by the formula:

[0065]

[0066] Among them, N ratio is the current neutralization ratio, I 1 is the current signal emitted by the first ionic liquid thruster alone, I 3 is the current signal of the first collecting plate when the two thrusters are working simultaneously. The neutralization ratio is calculated by the formula Figure 5 As shown in the figure, the highest neutralization ratio of the emission current is 98% for positive polarity and 81% for negative polarity.

[0067] Furthermore, by moving the second ionic liquid thruster, the beam is gradually deposited on the second collecting plate as the distance between the second ionic liquid thruster and the first ionic liquid thruster increases, and the emission current of the second collecting plate can be calculated to obtain the divergence angle and current distribution of the beam. Through the geometric relationship between the various components in the embodiment, it can be calculated that when the voltage is ±1600V and the flow rate is 1.77nL / s, the divergence angle at positive polarity is 39.66°, and the divergence angle at negative polarity is 49.03°. Figure 6 According to the method shown in the figure, as the distance of the beam of the second ionic liquid thruster increases, the beam deposited on the second collecting plate gradually increases. By cutting and calculating the beam deposited on the second collecting plate, the radial distribution of the current can be obtained. The result is shown in FIG. Figure 7 shown.

[0068] Although the embodiments of the present application have been shown and described above, the scope of protection of the present invention is not limited thereto, and any changes or substitutions that are not conceivable through creative work should be included in the scope of protection of the present invention; unless explicitly stated, any element, action or instruction used in this document should not be interpreted as critical or necessary.

Claims

1. A device for evaluating the performance of a self-neutralizing ionic liquid thruster, characterized in that: include: A first assembly rack, a second assembly rack, a first collecting plate, a second collecting plate, a lateral displacement platform and a current measuring device; The second assembly rack is mounted on the lateral displacement platform, and the lateral displacement platform is used to drive the second assembly rack to lateral displacement; The first assembly frame is opposite to the first collecting plate; The second collecting plate is parallel to the lateral displacement platform, and the first collecting plate and the second collecting plate are arranged side by side; The vertical distance between the first assembly rack and the first collecting plate is equal to the vertical distance between the second assembly rack and the second collecting plate; The first collecting plate and the second collecting plate are both electrically connected to the current measuring device, and the current measuring device is used to measure the current of the first collecting plate and the second collecting plate.

2. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 1, characterized in that: Also includes a base; The first assembly frame, the first collecting plate and the second collecting plate are all fixedly connected to the base; The base is provided with a placement groove, the lateral displacement platform is placed in the placement groove, and the first assembly rack and the second assembly rack have the same height; The first collecting plate and the second collecting plate are both perpendicular to the base.

3. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 1, characterized in that: The lateral displacement platform is an electric displacement platform.

4. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 2, characterized in that: The first assembly frame and the second assembly frame both include a positioning arm and a positioning seat; The positioning arm is used to be connected to the extraction pole of the ionic liquid thruster, and the positioning seat is used to be connected to the emission pole of the ionic liquid thruster.

5. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 4, characterized in that: The positioning arms are provided with two; An installation cavity is formed between the two positioning arms for accommodating an emitter and an extractor of the ionic liquid thruster.

6. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 1, characterized in that: There is a gap between the first collecting plate and the second collecting plate.

7. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 4, characterized in that: The positioning arm is configured to be parallel to the base.

8. The device for evaluating the performance of a self-neutralizing ionic liquid thruster according to claim 1, characterized in that: A high voltage square wave pulse power supply is also included for powering the emitter of the ionic liquid thruster.

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