CN218902244U - Space droplet generator based on laser modulation droplet diameter - Google Patents
Space droplet generator based on laser modulation droplet diameter Download PDFInfo
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- CN218902244U CN218902244U CN202221104717.7U CN202221104717U CN218902244U CN 218902244 U CN218902244 U CN 218902244U CN 202221104717 U CN202221104717 U CN 202221104717U CN 218902244 U CN218902244 U CN 218902244U
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Abstract
The utility model discloses a space droplet generator based on laser modulation droplet diameter, wherein a liquid chamber is communicated with a liquid storage chamber through a pipeline, a nozzle plate is arranged at the bottom of the liquid storage chamber, a pump is arranged on the pipeline and is used for pumping liquid in the liquid chamber into the liquid storage chamber after pressurizing, and jet liquid column is generated when the liquid passes through the nozzle plate; the laser transmitter is used for transmitting laser, and the laser direction transmitted by the laser transmitter is vertical to the direction of the jet liquid column; the focusing lens is positioned at the front end of the laser emitter and is used for focusing laser emitted by the laser emitter on the jet liquid column so as to disintegrate the jet liquid column into liquid drops; the liquid jet can simultaneously generate tens of thousands of uniform and stable micro liquid drops through laser thermal disturbance, and the diameter of the liquid drops can be controlled from two aspects of laser frequency and the size of the spray hole of the nozzle plate, so that the regulation and control are convenient.
Description
Technical Field
The utility model relates to the field of space radiation heat exchangers, in particular to a space droplet generator based on laser-modulated droplet diameter.
Background
With the continuous promotion of human beings on the exploration of the universe, various high-power spacecrafts, space and nuclear power propulsors are urgently required to be developed, and the larger power means the more waste heat is generated, and the space radiation heat exchanger is needed because the space environment is vacuum and the heat transfer mainly depends on radiation heat exchange.
The space radiation heat exchanger utilizes thousands of tiny and uniform liquid drops generated by the liquid drop generator to carry out radiation heat exchange with the universe environment, while the liquid drops generated by the traditional liquid drop generator such as piezoelectric type, pneumatic type, electromagnetic type and the like have poor uniformity, small quantity of liquid drops, difficult change of liquid drop diameter, complex structure and inconvenient processing and space transportation.
Accordingly, the conventional droplet generator used in the space radiation heat exchanger of the prior art has yet to be improved and developed.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a space droplet generator based on laser modulating the diameter of droplets, which can generate a large number of uniform micro droplets and has adjustable diameter.
The technical scheme of the utility model is as follows: a space droplet generator based on laser modulating droplet diameter comprises a liquid chamber, a pump, a liquid storage chamber, a nozzle plate, a focusing lens and a laser emitter; the liquid chamber is communicated with the liquid storage chamber through a pipeline, the nozzle plate is arranged at the bottom of the liquid storage chamber, and the pump is arranged on the pipeline and is used for pumping liquid in the liquid chamber into the liquid storage chamber after pressurizing the liquid and enabling the liquid to generate jet liquid column when passing through the nozzle plate; the laser transmitter is used for transmitting laser, and the laser direction transmitted by the laser transmitter is vertical to the direction of the jet liquid column; the focusing lens is positioned at the front end of the laser emitter and is used for focusing laser emitted by the laser emitter on the jet liquid column so that the jet liquid column is disintegrated to form liquid drops.
The space droplet generator based on the laser modulation droplet diameter comprises: the nozzle plate is a single-layer pore plate, 100X 100 nozzle arrays with diameters of 100-300 microns are uniformly distributed on the single-layer pore plate, and chamfers are arranged on openings on one sides of all nozzle holes facing the liquid storage chamber.
The space droplet generator based on the laser modulation droplet diameter comprises: the nozzle plate is formed by overlapping more than two layers of multi-layer pore plates, the pore sizes of the spray holes between the pore plates of different layers are different, and the adjacent two layers of pore plates can finely move to generate dislocation.
The space droplet generator based on the laser modulation droplet diameter comprises: and a flowmeter and a pressure gauge are arranged on the pipeline between the pump and the liquid storage chamber, the flowmeter is used for displaying and monitoring the flow rate or the flow velocity of the liquid flowing into the liquid storage chamber in real time, and the pressure gauge is used for displaying and monitoring the pressure of the liquid flowing into the liquid storage chamber.
The space droplet generator based on the laser modulation droplet diameter comprises: and a filter membrane is arranged on a pipeline between the pump and the liquid storage chamber and is used for filtering liquid flowing into the liquid storage chamber.
The space droplet generator based on the laser modulation droplet diameter comprises: the laser transmitter is connected with the oscilloscope through a signal transmission line and is used for adjusting the frequency of laser emitted by the laser transmitter.
The space droplet generator based on the laser modulation droplet diameter comprises: the laser transmitter is connected with the oscilloscope through a signal transmission line and is used for adjusting the power of laser emitted by the laser transmitter.
The space droplet generator based on the laser modulation droplet diameter comprises: the pump is a gear pump.
The space droplet generator based on the laser-modulated droplet diameter can enable liquid jet flow to simultaneously generate tens of thousands of uniform and stable micro droplets through laser thermal disturbance, and the droplet diameter can be controlled from two aspects of laser frequency and the size of a spray hole of a nozzle plate, and is convenient to regulate and control.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way; the shapes and proportional sizes of the components in the drawings are only illustrative, and are not intended to limit the shapes and proportional sizes of the components of the present utility model in particular, so as to assist in understanding the present utility model; those skilled in the art with access to the teachings of the present utility model can select a variety of possible shapes and scale sizes to practice the present utility model as the case may be.
FIG. 1 is a schematic diagram of the structural composition of a spatial drop generator based on laser-modulated drop diameters of the present utility model;
FIG. 2 is an enlarged schematic view of the planar structure of a nozzle plate used in the spatial drop generator based on laser-modulated drop diameter of the present utility model;
FIG. 3 is an enlarged schematic view of the cross-sectional structure of a nozzle plate used in the spatial drop generator based on laser-modulated drop diameter of the present utility model;
FIG. 4 is a graph showing the comparison of the pitches of droplets produced by the spatial droplet generator of the present utility model under different frequencies of laser irradiation;
FIG. 5 is a graph of the comparison of the spacing of droplets produced by the spatial droplet generator of the present utility model under different power laser irradiation.
The reference numerals in the figures are summarized: liquid chamber 1, pump 2, flowmeter 3, manometer 4, filter membrane 5, reservoir 6, nozzle plate 7, orifice 7a, focusing lens 8, laser emitter 9, pipeline 11, signal transmission line 12.
Detailed Description
The following detailed description and examples of the utility model are presented in conjunction with the drawings, and the described examples are intended to illustrate the utility model and not to limit the utility model to the specific embodiments.
As shown in fig. 1, the space droplet generator based on laser-modulated droplet diameter provided by the utility model comprises a liquid chamber 1, a pump 2, a liquid storage chamber 6, a nozzle plate 7, a focusing lens 8 and a laser emitter 9; wherein the liquid chamber 1 is communicated with the liquid storage chamber 6 through a pipeline 11, the nozzle plate 7 is arranged at the bottom of the liquid storage chamber 6, the pump 2 is arranged on the pipeline 11 and is used for pumping liquid in the liquid chamber 1 into the liquid storage chamber 6 after being pressurized, and jet liquid column is generated when the liquid passes through the nozzle plate 7; the laser emitter 9 is used for emitting laser, and the direction of the laser emitted by the laser emitter 9 is perpendicular to the direction of the jet liquid column; the focusing lens 8 is located at the front end of the laser emitter 9, and is used for focusing the laser emitted by the laser emitter 9 on the jet liquid column, so that the jet liquid column disintegrates to form liquid drops.
When the laser emitted by the laser emitter 9 is focused and irradiated on the jet liquid column through the focusing lens 8, tiny thermal disturbance is generated inside the jet liquid column, the thermal disturbance is enhanced with time, and the jet liquid column is unstable under the action of surface tension according to the Rayleigh principle and is easy to disintegrate; through testing, when the laser wavelength of the external disturbance is larger than the wetting perimeter of the jet liquid column for a certain time, the jet liquid column is disintegrated to form liquid drops.
In the specific embodiment of the space droplet generator based on laser-modulated droplet diameter of the present utility model, as shown in fig. 2 and 3, when the nozzle plate 7 is a single-layer orifice plate, 100×100 nozzle 7a arrays with diameters of 100-300 microns are uniformly distributed on the single-layer orifice plate, and the openings of all nozzle 7a facing the liquid storage chamber 6 are provided with chamfers, so as to facilitate more fluid entering the nozzle 7a.
Further, when the nozzle plate 7 is formed by stacking two, three or more layers of orifice plates, the sizes of the orifices 7a between the orifice plates of different layers are different, and the adjacent two layers of orifice plates can be finely moved to generate dislocation, thereby finely adjusting the sizes of the orifices 7a of the nozzle plate 7 by adjusting the positions between the adjacent orifice plates.
Further, a flow meter 3, a pressure meter 4 and a filter membrane 5 are sequentially arranged on a pipeline 11 between the pump 2 and the liquid storage chamber 6, the flow meter 3 is used for displaying and monitoring the flow rate or the flow velocity of liquid flowing into the liquid storage chamber 6 in real time, the pressure meter 4 is used for displaying and monitoring the pressure of the liquid flowing into the liquid storage chamber 6, and the filter membrane 5 is used for filtering the liquid flowing into the liquid storage chamber 6 to prevent the spray hole 7a from being blocked.
Further, the laser transmitter 9 is connected with the oscilloscope 10 through a signal transmission line 12, and is used for adjusting the frequency and the power of laser emitted by the laser transmitter 9 within the frequency range of 2000-5500 Hz.
Specifically, the power of the laser emitter 9 is between 0.15 and 3.38W, and the wavelength of the emitted laser is 532nm; the focal length of the focusing lens 8 preferably focuses the laser light emitted by the laser emitter 9 to about 20 microns.
Preferably, the pump 2 is a gear pump, small in volume, and capable of expressing fluid at high pressure differences upstream and downstream.
In a specific embodiment of the spatial drop generator based on laser-modulated drop diameter of the present utility model, in particular, it is assumed that the time required for the thermal disturbance of the laser to increase from the initial intensity to the intensity required for disintegration of the jet liquid column istThe distance between the irradiation point of the laser irradiated on the jet liquid column and the disintegration point of the jet liquid column when disintegration starts is the disintegration length of the jet liquid columnL b The relationship between the twoL b =vt，vRepresenting the jet velocity, assuming that the radius of the liquid drops after disintegration of the jet liquid column isR d According to the law of conservation of mass,
wherein, the method comprises the steps of, wherein,R o for the radius of the nozzle plate 7 orifice 7a,fa frequency of the laser light emitted from the laser emitter 9; when changing the radius of the spray hole 7a and/or the laser frequency, the radius of the liquid drop can be correspondingly changed to beR d The method comprises the steps of carrying out a first treatment on the surface of the Assuming that the distance between two adjacent droplets isd，/>
When adjusting the laser frequencyfAt the time of droplet pitchdAnd will change accordingly.
In the first embodiment, the pump 2 of the gear pump is used for pressurizing the fluid pressure in the pipeline 11 to 0.4-0.8 mpa, keeping the fluid speed in the pipeline 11 to 1-10 m/s, monitoring in real time through the flowmeter 3 and the manometer 4 on the pipeline 11, filtering the fluid in the pipeline 11 through the filter membrane 5, flowing into the liquid storage chamber 6, changing into a jet liquid column array through a 100×100 jet orifice 7a array with the aperture of 100-300 micrometers on the nozzle plate 7, ejecting, emitting a rectangular surface laser source with the wavelength of 532nm and the energy of 0.1-3.3 w by the laser emitter 9, focusing into 20 micrometers by the focusing lens 8, irradiating on the jet liquid column array, and finally breaking into uniform and stable liquid drops along with the internal thermal disturbance growth, so that the jet liquid column array is broken into a micro liquid drop array; when the nozzle plate 7 adopts a multi-layer orifice plate, the relative position between the multi-layer orifice plates can be adjusted, so that the size of the aperture of the nozzle 7a of the nozzle plate 7 can be changed, and the purpose of changing the size of liquid drops can be achieved; when the nozzle plate 7 adopts a single-layer pore plate, the frequency of laser emitted by the laser emitter 9 can be adjusted through the oscilloscope 10, and the purpose of changing the size of liquid drops can be achieved; by reasonably adjusting the laser frequency, power and aperture of the nozzle plate 7 and the nozzle hole 7a, a uniform and stable liquid drop array can be continuously generated.
In the second embodiment, the flow rate of a single spray hole 7a of the nozzle plate 7 is 1.37ml/min, the diameter of a spray liquid column is 115.6 microns, the speed of the spray liquid column is 2.18m/s, the laser power is 3.38W, the laser wavelength lambda=532 nm, the frequency of laser emitted by the laser emitter 9 is adjusted between 2000Hz and 5500Hz through the oscilloscope 10, as shown in fig. 4, uniform and stable liquid drops can be generated through visual observation, and the larger the frequency is, the smaller the liquid drop interval is, the smaller the liquid drop diameter is, but the distance from a liquid drop splitting point to a spray nozzle is not changed obviously.
In the third embodiment, the flow rate of a single spray hole 7a of the nozzle plate 7 is 1.37ml/min, the diameter of a spray liquid column is 115.6 microns, the speed of the spray liquid column is 2.18m/s, the laser frequency is 4500Hz, the laser wavelength lambda=532 nm, the power of laser emitted by the laser emitter 9 is adjusted between 0.15W and 3.38W through the oscilloscope 10, as shown in fig. 5, uniform and stable liquid drops can be generated through visual observation, and the distance from a liquid drop splitting point to a nozzle is smaller and smaller along with the increase of the laser power, but the liquid drop distance and the liquid drop diameter are not changed obviously.
What is not described in detail in this specification is all that is known to those of ordinary skill in the art.
It should be understood that the foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the technical solutions of the present utility model, and it should be understood that the foregoing may be added, substituted, altered or modified within the spirit and principle of the present utility model by those skilled in the art, and all such added, substituted, altered or modified embodiments fall within the scope of the appended claims.
Claims (8)
1. A space droplet generator based on laser modulating droplet diameter, which is characterized by comprising a liquid chamber (1), a pump (2), a liquid storage chamber (6), a nozzle plate (7), a focusing lens (8) and a laser emitter (9); the liquid chamber (1) is communicated with the liquid storage chamber (6) through a pipeline (11), the nozzle plate (7) is arranged at the bottom of the liquid storage chamber (6), the pump (2) is arranged on the pipeline (11) and is used for pumping liquid in the liquid chamber (1) into the liquid storage chamber (6) after pressurizing, and jet liquid column is generated when the liquid passes through the nozzle plate (7); the laser emitter (9) is used for emitting laser, and the direction of the laser emitted by the laser emitter (9) is perpendicular to the direction of the jet liquid column; the focusing lens (8) is positioned at the front end of the laser emitter (9) and is used for focusing laser emitted by the laser emitter (9) on the jet liquid column so as to disintegrate the jet liquid column into liquid drops.
2. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: the nozzle plate (7) is a single-layer pore plate, 100 multiplied by 100 spray holes (7 a) with the diameter of 100-300 microns are uniformly distributed on the single-layer pore plate, and chamfer angles are arranged on one side, facing the liquid storage chamber (6), of all the spray holes (7 a).
3. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: the nozzle plate (7) is formed by overlapping more than two layers of multi-layer pore plates, the pore sizes of the spray holes (7 a) between the pore plates of different layers are different, and the adjacent two layers of pore plates can finely move to generate dislocation.
4. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: the pipeline (11) between the pump (2) and the liquid storage chamber (6) is provided with a flowmeter (3) and a pressure gauge (4), the flowmeter (3) is used for displaying and monitoring the flow rate or the flow velocity of liquid flowing into the liquid storage chamber (6) in real time, and the pressure gauge (4) is used for displaying and monitoring the pressure of the liquid flowing into the liquid storage chamber (6).
5. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: and a filter membrane (5) is arranged on a pipeline (11) between the pump (2) and the liquid storage chamber (6) and is used for filtering liquid flowing into the liquid storage chamber (6).
6. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: the laser transmitter (9) is connected with the oscilloscope (10) through a signal transmission line (12) and is used for adjusting the frequency of laser emitted by the laser transmitter (9).
7. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: the laser transmitter (9) is connected with the oscilloscope (10) through a signal transmission line (12) and is used for adjusting the power of laser emitted by the laser transmitter (9).
8. The laser modulated droplet diameter based spatial droplet generator of claim 1 wherein: the pump (2) is a gear pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221104717.7U CN218902244U (en) | 2022-05-10 | 2022-05-10 | Space droplet generator based on laser modulation droplet diameter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221104717.7U CN218902244U (en) | 2022-05-10 | 2022-05-10 | Space droplet generator based on laser modulation droplet diameter |
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| Publication Number | Publication Date |
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| CN218902244U true CN218902244U (en) | 2023-04-25 |
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| CN202221104717.7U Active CN218902244U (en) | 2022-05-10 | 2022-05-10 | Space droplet generator based on laser modulation droplet diameter |
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