Droplet ejection device for space station on-line cabin inertial particle dynamics experiment

Abstract

The application relates to a liquid drop spraying device for an inertial particle dynamics experiment of an online cabinet of a space station, which comprises a fiber coupler, a spray head and a support, the fiber coupler and the spray head are both installed on the support, a light path channel and a liquid path channel are vertically arranged and cross arranged in the support, the spray head is coaxially installed at one end of the liquid path channel and communicates with the liquid path channel, and the other end of the liquid path channel is in an open structure; the fiber coupler is coaxially installed at one end of the light path channel and communicates with the light path channel, the intersection point of the central axis of the light path channel and the central axis of the liquid path channel is a light-liquid intersection point, and the liquid spraying end of the spray head is located above the light-liquid intersection point; the support comprises a support surface and an assembly surface, the spray head is installed on the support surface side of the support through a clamping assembly, the assembly surface of the support is used for assembling with a turbulent flow generating device, and the support surface and the assembly surface are arranged in parallel opposition or at an acute angle.

Description

Technical Field

[0001] This invention relates to the technical field of space fluid science experiments, specifically to a droplet jetting device for inertial particle dynamics experiments on a space station. Background Technology

[0002] Many natural phenomena and industrial processes involve turbulent flows carrying particulate matter, such as blowing sand, cloud and fog evolution, pneumatic transport, atomization, fluidized bed combustion, and catalysis. In these flows, the density of the dispersed particulate phase is usually different from that of the continuous fluid phase, and its inertial effect cannot be ignored, causing the particles to not completely follow the fluid's motion. The motion of these inertial particles in the flow field exhibits many unique characteristics, such as their aggregation and distribution in certain regions of the flow field and the long-tailed probability density distribution of relative velocities between particles. These characteristics have a crucial impact on the flow carrying particles themselves. For example, the aggregation and distribution of inertial particles in specific regions of the flow field can greatly increase the collision frequency between inertial particles. The collision frequency between droplets in cumulus clouds determines the speed of rainfall formation, which directly determines the duration of the cumulus cloud itself.

[0003] Current research on the dynamics of inertial particles in turbulent flow fields faces numerous challenges in both theoretical analysis and numerical simulation. Current theoretical analyses and numerical simulations rely on simplified single-particle motion equations, which neglect various fluid-induced mechanisms of particle interaction (e.g., historical forces) and only consider viscous drag (Stokes drag). Furthermore, these analyses and simulations fail to account for inter-particle interactions via fluid flow, which can be significant when particles are close together, such as fluid lubrication. Therefore, while theoretical analyses indicate that turbulence may significantly increase the collision frequency between inertial particles, the specific dependence of this collision frequency on particle properties and turbulent field characteristic parameters remains inconclusive. Thus, obtaining high-quality experimental data is crucial for studying the dynamic characteristics of inertial particles in turbulent flow fields. However, in ground-based experiments, the motion of inertial particles is inevitably affected by gravity, introducing additional complexity to the analysis and utilization of experimental results. A common method to reduce the influence of gravity in ground-based fluid experiments is to increase the flow velocity. If the influence of gravity is reduced by enhancing flow field pulsation, then the particle diameter also needs to be reduced to keep the particle inertia within the range of interest. Furthermore, the significant contribution of turbulent flow to droplet collisions comes from the so-called nonlocal effect, where disturbances in the turbulent field allow inertial particles to travel at higher speeds to distant locations and collide with other local particles. Identifying this effect requires tracking the inertial particles for a relatively long time.

[0004] Therefore, studying the dynamic characteristics of inertial particles in turbulent flow fields on a space station has significant theoretical and practical value, and it is necessary to provide a droplet injection device for injecting liquid columns into turbulence generation cavities.

[0005] Currently, laser-modulated jet fragmentation has been used in the laboratory to achieve uniform droplet size after fragmentation. The laser-controlled jet device can be used under microgravity and its overall size is large, making it inconvenient to integrate into space experimental devices. It is also inconvenient to replace and cannot be used for different experimental needs. Summary of the Invention

[0006] In order to solve one or more of the technical problems existing in the prior art, the present invention provides a droplet jetting device for inertial particle dynamics experiments in a space station.

[0007] The technical solution of this invention to solve the above-mentioned technical problems is as follows: This invention provides a droplet jetting device for an inertial particle dynamics experiment in a space station, comprising an optical fiber coupler, a nozzle, and a support. The optical fiber coupler and the nozzle are both mounted on the support. The support has vertically arranged and intersecting optical and liquid channels. The nozzle is coaxially mounted at one end of the liquid channel and communicates with the liquid channel. The other end of the liquid channel is an open structure. The optical fiber coupler is coaxially mounted at one end of the optical channel and communicates with the optical channel. The intersection of the central axis of the optical channel and the central axis of the liquid channel is the optical-liquid phase intersection point. The jetting end of the nozzle is located above the optical-liquid phase intersection point. The support includes a support surface and an assembly surface. The nozzle is mounted on the support surface side of the support via a clamping assembly. The assembly surface of the support is used for assembly with the turbulence generating device. The support surface and the assembly surface are arranged parallel to each other or at an acute angle.

[0008] The beneficial effects of this invention are as follows: The droplet jetting device for inertial particle dynamics experiments in the space station of this invention is small in size and easy to integrate. Both the optical path channel and the liquid path channel are integrated on the support component. The entire support component is easy to disassemble and assemble, and different jetting devices can be replaced as needed. The liquid is delivered to the turbulence generation cavity through the nozzle. The fiber optic coupler can be connected to the laser. The pulsed laser generated by the laser is transmitted to the liquid path nozzle through the optical fiber. The laser is focused on the jet section close to the nozzle. The pulsed laser generates thermal excitation to modulate the surface tension of the jet at the liquid spraying end, generating droplets to facilitate subsequent turbulence experiments.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the clamping assembly includes a support plate, a positioning block, and a clamping block. The support plate is detachably connected to the support surface of the support member. The positioning block is fixed on the support plate. The clamping block and the positioning block are detachably connected by screws. A clamping channel is formed between the clamping block and the positioning block. A nozzle through hole is provided on the support plate to connect the clamping channel with the liquid channel. The nozzle is clamped and positioned in the clamping channel by the positioning block and the clamping block and extends into the liquid channel through the nozzle through hole.

[0011] The beneficial effects of adopting the above-mentioned further solution are: by setting positioning blocks and clamping blocks, it is convenient to clamp the nozzle and adjust the clamping position and force, etc., and after adjustment, it can be fixed with aerospace adhesive.

[0012] Furthermore, when the supporting surface and the assembly surface are arranged parallel to each other, a mounting slot is provided on the supporting surface of the supporting plate. The supporting plate is installed at the bottom of the mounting slot by screws and both ends extend from the openings at both ends of the mounting slot. The bottom of the mounting slot is arranged parallel to the supporting surface. When the support surface and the assembly surface are arranged at an acute angle, the support plate is directly mounted on the support surface by screws.

[0013] The beneficial effects of adopting the above-mentioned further solution are: by setting the installation through slot, the overall structural layout is made more compact, which also facilitates the assembly of components such as fiber optic couplers.

[0014] Furthermore, a first mounting groove is formed on the support member, and the optical fiber coupler is sealed and assembled in the first mounting groove.

[0015] Furthermore, when the support surface and the assembly surface are arranged parallel to each other, a second assembly groove is formed on the outer surface of the support member, and a beam terminator is installed in the second assembly groove. The beam terminator is coaxially arranged at the other end of the optical path channel and communicates with the optical path channel. When the supporting surface and the assembly surface are arranged at an acute angle, the other end of the optical path channel is a blocking structure.

[0016] Furthermore, when the supporting surface and the assembly surface are arranged parallel to each other, the distance between the optical-liquid phase intersection point and the assembly surface along the liquid channel direction is a; when the supporting surface and the assembly surface are arranged at an acute angle, the distance between the optical-liquid phase intersection point and the assembly surface along the liquid channel direction is b; wherein, a > b, and the difference between a and b is 1 mm ~ 2 mm.

[0017] The beneficial effect of adopting the above-mentioned further solution is that when the support surface and the assembly surface are arranged at an acute angle, the distance between the nozzle and the turbulence generation cavity can be shortened, which will greatly reduce the probability of droplet aggregation.

[0018] Furthermore, the support member is also provided with an observation channel, which is arranged perpendicularly to the optical path channel and the liquid path channel respectively. The central axis of the observation channel passes through the intersection of the optical and liquid phases, and the two ends of the observation channel are respectively detachably connected with dustproof structures.

[0019] The beneficial effect of adopting the above-mentioned further solution is that by setting up an observation channel, it is convenient to observe the formation of internal droplets.

[0020] Furthermore, the dustproof structure includes a dust plug or a dustproof baffle.

[0021] Furthermore, the fiber optic coupler includes a housing, a lens assembly, and a fiber optic connector. The housing is coaxially mounted at one end of the optical path channel and communicates with the optical path channel. The lens assembly is coaxially mounted on the inner side of one end of the housing and arranged close to the support member. The fiber optic connector is coaxially mounted on the inner side of the other end of the housing and arranged at a distance from the lens assembly.

[0022] Furthermore, it also includes a laser, an optical fiber, an injection pump, and a storage bag. The injection pump is connected to the storage bag and the nozzle respectively and injects the working fluid in the storage bag into the liquid channel through the nozzle. The laser is connected to the optical fiber coupler through the optical fiber and emits laser light into the optical channel. The nozzle sprays the working fluid to form a liquid column and is dispersed by the laser at the optical-liquid intersection point to form droplets. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of one embodiment of the droplet jetting device for the inertial particle dynamics experiment in the space station's linear cabinet according to the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of one embodiment of the droplet jetting device for the inertial particle dynamics experiment in the space station's linear cabinet according to the present invention. Figure 2 ; Figure 3 This is a front view schematic diagram of one embodiment of the droplet jetting device for inertial particle dynamics experiments in a space station of the present invention. Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA; Figure 5 This is a three-dimensional structural schematic diagram of a cross-sectional view of one embodiment of the droplet jetting device for inertial particle dynamics experiments in a space station of the present invention. Figure 6 This is a three-dimensional structural diagram of another embodiment of the droplet jetting device for the inertial particle dynamics experiment in the space station of the present invention. Figure 1 ; Figure 7 This is a three-dimensional structural diagram of another embodiment of the droplet jetting device for the inertial particle dynamics experiment in the space station's linear cabinet according to the present invention. Figure 2 ; Figure 8 This is a front view schematic diagram of another embodiment of the droplet jetting device for inertial particle dynamics experiments in a space station according to the present invention. Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure of AA; Figure 10 This is a schematic diagram of the connection between the injection pump, the reservoir bag, and the nozzle of the present invention.

[0024] The attached diagram lists the components represented by each number as follows: 200. Support component; 201. Support surface; 202. Assembly surface; 203. Nozzle; 204. Optical path channel; 205. Liquid path channel; 206. Observation channel; 207. Dust plug; 208. Screw; 209. Spraying end; 210. Support plate; 211. Positioning block; 212. Clamping block; 213. Mounting slot; 214. Slot bottom; 215. Beam terminator; 216. Sealing structure; 217. Housing; 218. Lens assembly; 219. Fiber optic connector; 220. Injection pump; 221. Liquid storage bag; 222. Fiber optic coupler; 223. Dustproof baffle; 224. First assembly slot. Detailed Implementation

[0025] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] Example 1 like Figures 1-10 As shown in this embodiment, a droplet ejection device for an inertial particle dynamics experiment on a space station includes an optical fiber coupler 222, a nozzle 203, and a support 200. Both the optical fiber coupler 222 and the nozzle 203 are mounted on the support 200. The support 200 contains vertically arranged and intersecting optical path channels 204 and liquid path channels 205. The nozzle 203 is coaxially mounted at one end of the liquid path channel 205 and communicates with it. The other end of the liquid path channel 205 is open. The optical fiber coupler 222 is coaxially mounted at one end of the optical path channel 204 and communicates with it. The intersection of the central axis of the optical path channel 204 and the central axis of the liquid path channel 205 is the optical-liquid phase intersection point. The ejection end 209 of the nozzle 203 is located above the optical-liquid phase intersection point. The support member 200 includes a support surface 201 and an assembly surface 202. The nozzle 203 is mounted on the support surface 201 side of the support member 200 via a clamping assembly. The assembly surface 202 of the support member 200 is used for assembly with a turbulence generating device. The support surface 201 and the assembly surface 202 are arranged parallel to each other or at an acute angle.

[0027] Preferred, such as Figures 3-5 As shown, the liquid channel 205 protrudes from the assembly surface 202 by a predetermined distance. When assembling with the turbulence generating mechanism, the liquid channel 205 can be extended into the turbulence generating cavity of the turbulence generating mechanism, so that the droplets can smoothly enter the turbulence generating cavity.

[0028] like Figure 5 and Figure 7 As shown, a first assembly groove 224 is formed on the support member 200, and the optical fiber coupler 222 is sealed and assembled in the first assembly groove 224.

[0029] Specifically, such as Figure 5 As shown, the fiber optic coupler 222 in this embodiment includes a housing 217, a lens assembly 218, and a fiber optic connector 219. The housing 217 is coaxially mounted on one end of the optical path channel 204 and communicates with the optical path channel 204. The lens assembly 218 is coaxially mounted on the inner side of one end of the housing 217 and arranged close to the support member 200. The fiber optic connector 219 is coaxially mounted on the inner side of the other end of the housing 217 and arranged at a distance from the lens assembly 218.

[0030] The droplet jetting device for the inertial particle dynamics experiment on the space station in this embodiment integrates both the optical and liquid channels on the support. The entire support is easy to disassemble and assemble, and different jetting devices can be replaced as needed. The liquid is delivered to the turbulence generation chamber through the nozzle. The fiber optic coupler can be connected to the laser. The pulsed laser generated by the laser is transmitted to the liquid nozzle through the optical fiber. The laser is focused on the jet section close to the nozzle. The pulsed laser generates thermal excitation to modulate the surface tension of the jet at the liquid spray end, generating droplets to facilitate subsequent turbulence experiments.

[0031] Example 2 Based on Embodiment 1, this embodiment provides a preferred structural configuration for the clamping assembly. For example... Figures 3-5 , Figure 7 and Figure 9As shown, the clamping assembly includes a support plate 210, a positioning block 211, and a clamping block 212. The support plate 210 is detachably connected to the support surface 201 of the support member 200. The positioning block 211 is fixed on the support plate 210. The clamping block 212 is detachably connected to the positioning block 211 by screws 208. A clamping channel is formed between the clamping block 212 and the positioning block 211. The support plate 210 has a nozzle through hole that connects the clamping channel to the liquid passage 205. The nozzle 203 is clamped and positioned in the clamping channel by the positioning block 211 and the clamping block 212 and extends into the liquid passage 205 through the nozzle through hole. The portions of the support plate located on both sides of the clamping channel can be fixed to the support member by screws. Fine adjustments such as vertical position and tilt angle can be made by tightening or loosening the screws.

[0032] like Figures 1-5 As shown, when the support surface 201 and the assembly surface 202 are arranged parallel to each other, the support surface 201 of the support plate 210 has a mounting slot 213. The support plate 210 is installed in the bottom 214 of the mounting slot 213 by screws 208, with both ends extending from the openings at both ends of the mounting slot 213. The bottom 214 of the mounting slot 213 is arranged parallel to the support surface 201. By setting the mounting slot, the overall structural layout is made more compact, which facilitates the assembly of components such as fiber optic couplers. When the support surface and the assembly surface are arranged at an acute angle, the support plate is directly installed in the support surface by screws.

[0033] Example 3 Based on Embodiment 1 or Embodiment 2, this embodiment provides an optional termination method for the laser beam. For example... Figure 5 As shown, when the support surface 201 and the assembly surface 202 are arranged parallel to each other, a second assembly groove is formed on the outer surface of the support member 200. A beam terminator 215 is installed in the second assembly groove. The beam terminator 215 is coaxially arranged at the other end of the optical path channel 204 and communicates with the optical path channel 204. Figure 6 As shown, when the support surface 201 and the assembly surface 202 are arranged at an acute angle, the other end of the optical path channel 204 is a blocking structure 216.

[0034] Example 4 Based on any of the above embodiments, in this embodiment, when the support surface 201 and the assembly surface 202 are arranged parallel to each other, the distance between the optical-liquid phase intersection point and the assembly surface 202 along the direction of the liquid channel 205 is 'a'; when the support surface 201 and the assembly surface 202 are arranged at an acute angle, the distance between the optical-liquid phase intersection point and the assembly surface 202 along the direction of the liquid channel 205 is 'b'; wherein, a > b, and the difference between a and b is 1 mm ~ 2 mm. When the support surface and the assembly surface are arranged at an acute angle, the distance between the nozzle and the turbulence generating cavity can be shortened, which will greatly reduce the probability of droplet aggregation.

[0035] In this embodiment, when the support surface and the assembly surface are arranged at an acute angle, droplets of various diameters can be generated. This allows the nozzle to be as close as possible to or directly into the experimental chamber, minimizing the stable transition period between droplet generation and entry into the turbulent flow field. This ensures that the droplets immediately enter the turbulent flow field region after generation, utilizing the turbulence within the chamber to disperse the droplet string and effectively prevent collision and aggregation. By slightly tilting the nozzle and reducing the size of the fiber optic coupler, the distance between the nozzle and the chamber can be shortened from the original 19.1 mm to approximately 10 mm, which will greatly reduce the probability of droplet aggregation. Furthermore, apart from the tilt angle, other components of the device do not have additional effects, and the outer envelope size and mass do not exceed the corresponding size and mass of the parallel-arranged support components.

[0036] Example 5 Based on any of the above embodiments, such as Figures 4-6 , Figure 8 As shown, the support member 200 in this embodiment also has an observation channel 206. The observation channel 206 is arranged perpendicularly to the optical path channel 204 and the liquid path channel 205, respectively. The central axis of the observation channel 206 passes through the intersection of the optical and liquid paths. Dustproof structures are detachably connected to the open ends of the observation channel 206. By setting up the observation channel, it is convenient to observe the formation of internal droplets. Since the droplets have a certain initial velocity, the droplets will not enter the observation channel and the optical path channel.

[0037] Specifically, such as Figures 1-4 , Figures 6-9 As shown, the dustproof structure includes a dust plug 207 or a dust baffle 223.

[0038] Example 6 Based on any of the above embodiments, this embodiment provides a further solution for a droplet ejection device for an inertial particle dynamics experiment in a space station, such as... Figure 10As shown, the droplet ejection device also includes a laser, an optical fiber, an injection pump 220, and a liquid storage bag 221. The injection pump 220 is connected to both the liquid storage bag 221 and the nozzle 203, injecting the working fluid from the storage bag 221 into the liquid channel 205 through the nozzle 203. The laser is connected to the optical fiber coupler 222 via an optical fiber and emits laser light into the optical channel 204. The nozzle 203 ejects the working fluid to form a liquid column, which is then dispersed by the laser at the light-liquid intersection point to form droplets. The laser can adopt the structure commonly used in space stations, mainly consisting of dual laser sources, lenses, indicator light shaping, beam splitters, couplers, and polarizers. A thermoelectric cooling unit is installed on its bottom surface to dissipate heat from the optical components. The injection pump can be a commonly used liquid injection pump in space stations.

[0039] The main function of the droplet ejection device in this embodiment is to modulate the surface tension of the vertical jet generated by the injection pump through thermal excitation by a pulsed laser, thereby generating droplets with the required particle size for the experiment. Liquid is delivered to the top of the turbulence generation chamber via the injection pump and piping, and then ejected vertically downwards as a jet from the nozzle. The pulsed laser generated by the laser is transmitted to the nozzle through an optical fiber. The laser is focused on the jet section near the nozzle, and the thermal excitation generated by the pulsed laser modulates the surface tension of the jet at the nozzle, generating droplets.

[0040] In the description of this invention, it should be understood that the terms "center", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are 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, and therefore should not be construed as a limitation of this invention.

[0041] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A droplet ejection device for inertial particle dynamics experiments on a space station, characterized in that: The device includes an optical fiber coupler, a nozzle, and a support. Both the optical fiber coupler and the nozzle are mounted on the support. The support has vertically arranged and intersecting optical and liquid channels. The nozzle is coaxially mounted at one end of the liquid channel and communicates with it; the other end of the liquid channel is open. The optical fiber coupler is coaxially mounted at one end of the optical channel and communicates with it. The intersection of the central axis of the optical channel and the central axis of the liquid channel is the optical-liquid intersection point. The spray tip of the nozzle is located above this optical-liquid intersection point. The support includes a support surface and an assembly surface. The nozzle is mounted on the support surface side of the support via a clamping assembly. The assembly surface of the support is used for assembly with the turbulence generating device. The support surface and the assembly surface are arranged parallel to each other or at an acute angle.

2. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 1, characterized in that, The clamping assembly includes a support plate, a positioning block, and a clamping block. The support plate is detachably connected to the support surface of the support member. The positioning block is fixed on the support plate. The clamping block and the positioning block are detachably connected by screws. A clamping channel is formed between the clamping block and the positioning block. A nozzle through hole is provided on the support plate to connect the clamping channel with the liquid channel. The nozzle is clamped and positioned in the clamping channel by the positioning block and the clamping block and extends into the liquid channel through the nozzle through hole.

3. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 2, characterized in that, When the supporting surface and the assembly surface are arranged parallel to each other, an installation through groove is provided on the supporting surface of the supporting plate. The supporting plate is installed at the bottom of the installation through groove by screws and both ends extend from the openings at both ends of the installation through groove. The bottom of the installation through groove is arranged parallel to the supporting surface. When the support surface and the assembly surface are arranged at an acute angle, the support plate is directly mounted on the support surface by screws.

4. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 1, characterized in that, The support member has a first assembly groove, and the optical fiber coupler is sealed and assembled in the first assembly groove.

5. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 1, characterized in that, When the support surface and the assembly surface are arranged parallel to each other, a second assembly groove is formed on the outer surface of the support member. A beam terminator is installed in the second assembly groove. The beam terminator is coaxially arranged at the other end of the optical path channel and communicates with the optical path channel. When the supporting surface and the assembly surface are arranged at an acute angle, the other end of the optical path channel is a blocking structure.

6. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 5, characterized in that, When the supporting surface and the assembly surface are arranged parallel to each other, the distance between the optical-liquid phase intersection point and the assembly surface along the liquid channel direction is a; when the supporting surface and the assembly surface are arranged at an acute angle, the distance between the optical-liquid phase intersection point and the assembly surface along the liquid channel direction is b; wherein, a > b, and the difference between a and b is 1 mm ~ 2 mm.

7. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 1, characterized in that, The support component is also provided with an observation channel, which is arranged perpendicularly to the optical path channel and the liquid path channel respectively. The central axis of the observation channel passes through the intersection of the optical and liquid phases, and the two ends of the observation channel are respectively detachably connected with dustproof structures.

8. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 7, characterized in that, The dustproof structure includes a dust plug or a dust baffle.

9. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 1, characterized in that, The fiber optic coupler includes a housing, a lens assembly, and a fiber optic connector. The housing is coaxially mounted at one end of the optical path channel and communicates with the optical path channel. The lens assembly is coaxially mounted on the inner side of one end of the housing and arranged close to the support member. The fiber optic connector is coaxially mounted on the inner side of the other end of the housing and arranged at a distance from the lens assembly.

10. The droplet jetting device for inertial particle dynamics experiments on a space station line cabinet according to claim 1, characterized in that, It also includes a laser, an optical fiber, an injection pump, and a liquid storage bag. The injection pump is connected to the liquid storage bag and the nozzle respectively and injects the working fluid in the liquid storage bag into the liquid channel through the nozzle. The laser is connected to the optical fiber coupler through the optical fiber and emits laser light into the optical channel. The nozzle sprays the working fluid to form a liquid column and is dispersed by the laser at the optical-liquid intersection point to form droplets.

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