CN106768819B - Device and method for measuring drift space distribution condition of fog drops in wind tunnel - Google Patents
Device and method for measuring drift space distribution condition of fog drops in wind tunnel Download PDFInfo
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- CN106768819B CN106768819B CN201611258034.6A CN201611258034A CN106768819B CN 106768819 B CN106768819 B CN 106768819B CN 201611258034 A CN201611258034 A CN 201611258034A CN 106768819 B CN106768819 B CN 106768819B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
Abstract
The invention relates to a device and a method for measuring the drift space distribution condition of fog drops in a wind tunnel, wherein the device comprises a fog drop collecting frame suitable for being placed in the wind tunnel, the fog drop collecting frame comprises a mounting bracket and a plurality of cross beams mounted on the mounting bracket, each cross beam comprises a rotating component and water-sensitive paper mounted on the rotating component, and the rotation of the rotating component can enable the water-sensitive paper to be exposed to the outside or isolate the water-sensitive paper from the outside. The invention collects the fog drops by adopting the water-sensitive paper, maintains the advantages of the water-sensitive paper in the aspect of fog drop deposition, does not need a fog drop particle size analyzer measuring instrument, and reduces the measuring cost. Meanwhile, as the rotation of the rotating component can control the water-sensitive paper to be exposed to the outside so as to collect fog drops, and can also control the water-sensitive paper to be isolated from the outside before the water-sensitive paper is saturated, the defect that the water-sensitive paper is easy to saturate is avoided, and the water-sensitive paper can be applied to fields, orchards and other fields for measuring fog drop deposition, canopy penetrability and other scenes and can also be applied to wind tunnels.
Description
Technical Field
The invention relates to the technical field of agricultural precise measurement, in particular to a device and a method for measuring the drift space distribution condition of fog drops in a wind tunnel.
Background
With the development of modern precise agricultural technology, plant protection and pesticide application technologies are widely applied to the agricultural field. However, the problem of drift of droplets is still currently a major problem facing the field of plant protection and application. The fog drops sprayed by the agricultural spray head are influenced by the environmental wind field and are extremely easy to drift, so that serious problems of pollution of water and soil resources, phytotoxicity of non-target crops, health threat of people and livestock and the like are brought. The problem of fogdrop drift generated by aerial application is particularly serious, and in 1975, the U.S. environmental protection agency estimated that 10% -60% of chemical substances drift to more than 300m from the target, causing serious air, water and soil pollution. In order to control related variables affecting droplet drift and improve repeatability, wind tunnel experiments have been developed to study droplet drift problems. The wind tunnel experiment is effective support and supplement of field experiments, and has the advantages of controllable boundary conditions, high repeatability, various experimental means and the like compared with the field experiments.
At present, the research means of the wind tunnel experiment on the problem of the drift of the fog drops generated by the spray head is very limited, and the most classical method is to collect the space distribution situation of the fog drops by using a fiber yarn method, as shown in figure 1. However, the fluorescent agent adopted by the fiber yarn method is easy to cause pollution to the wind tunnel body, and the method can only analyze the drift amount of the fog drops, so that the distribution condition and the drift distance of the fog drops with different particle diameters in space are difficult to count. However, the cost of measuring instruments by a droplet size meter is high.
Although the water-sensitive paper is mainly used for measuring the problems of fog drop deposition, canopy penetrability and the like in fields, orchards and the like, so as to measure the particle size distribution of fog drops. Although having certain advantages in measuring fog drop deposition, it is generally rarely used in wind tunnel experiments because of its easy supersaturation.
Disclosure of Invention
Aiming at the defects, the invention provides the device and the method for measuring the drift space distribution condition of the fog drops in the wind tunnel, which can not pollute the wind tunnel, reduce the measuring cost and avoid the defect that the water-sensitive paper is easy to saturate.
In a first aspect, the device for measuring the drift space distribution situation of the fog drops in the wind tunnel provided by the invention comprises a fog drop collecting frame suitable for being placed in the wind tunnel, wherein the fog drop collecting frame comprises a mounting bracket and a plurality of cross beams mounted on the mounting bracket, each cross beam comprises a rotating component and water-sensitive paper mounted on the rotating component, and the rotation of the rotating component can enable the water-sensitive paper to be exposed to the outside or isolate the water-sensitive paper from the outside.
Optionally, the rotating assembly includes double-deck sleeve pipe, set up on the outer wall of double-deck sleeve pipe's the inlayer pipe and be used for installing the installation breach of water sensitive paper, double-deck sleeve pipe's outer pipe includes exposure part and isolation part, the exposure part is used for exposing water sensitive paper, isolation part is used for making water sensitive paper keeps apart with the external world.
Optionally, the mounting notch includes two parts disposed along a radial direction of the inner layer tube, the first part is close to a center of the inner layer tube relative to the second part, and a central angle of the first part is greater than a central angle of the second part.
Optionally, a waterproof sponge cushion is arranged on the inner wall of the isolation part of the outer layer tube.
Optionally, the rotating assembly comprises two pivoted metal plates, and the water-sensitive paper is clamped between the two metal plates.
Optionally, a waterproof sponge cushion is arranged on the edges of the two metal plates, and/or the two metal plates are all L-shaped metal plates.
Optionally, the device further comprises a stepping motor, wherein the stepping motor is used for controlling the rotation of the rotating assembly.
Optionally, the device further comprises a rack type linkage structure arranged on the mounting bracket, and the rack type linkage structure is connected with the stepping motor and the rotating assembly.
In a second aspect, the method for measuring the drift space distribution situation of the fog drops in the wind tunnel based on the device provided by the invention comprises the following steps:
arranging a spray head for spraying mist drops in a test section of the wind tunnel;
arranging the mounting bracket at a preset position downwind from the spray head, and arranging a plurality of outer layers of pipes on the mounting bracket;
installing water-sensitive paper in the installation notch of the inner layer pipe;
the inner layer pipe is arranged in the outer layer pipe, the inner layer pipe is rotated to isolate the water-sensitive paper from the outside, and a wind tunnel and the spray head are opened;
after the spray drops sprayed by the spray head reach a uniform and stable state, rotating the inner layer pipe to expose the water-sensitive paper to the outside so as to enable the water-sensitive paper to collect fog drops;
before the water-sensitive paper is saturated, the inner layer pipe is rotated to isolate the water-sensitive paper from the outside, and the wind tunnel and the spray head are closed;
and (3) extracting the inner layer tube, taking down the water-sensitive paper, scanning the water-sensitive paper, and analyzing the fog drop drift space distribution condition according to a scanning result.
In a third aspect, the method for measuring the drift space distribution situation of the fog drops in the wind tunnel based on the device provided by the invention comprises the following steps:
arranging a spray head for spraying mist drops in a test section of the wind tunnel;
arranging the mounting bracket at a preset position which is away from the downwind of the spray head, and arranging a plurality of rotating assemblies which mainly consist of two pivoted metal plates on the mounting bracket;
setting water-sensitive paper between two metal plates, covering the two metal plates, and starting the wind tunnel and the spray head;
after the spray drops sprayed by the spray head reach a uniform and stable state, rotating one of the metal plates to expose the water-sensitive paper to the outside, so that the water-sensitive paper collects fog drops;
before the water-sensitive paper is saturated, covering two metal plates to isolate the water-sensitive paper from the outside, and closing the wind tunnel and the spray head;
and rotating one of the metal plates, taking down the water-sensitive paper, scanning the water-sensitive paper, and analyzing the fog drop drift space distribution condition according to a scanning result.
According to the device and the method for measuring the drift space distribution condition of the fog drops in the wind tunnel, the water-sensitive paper is used for collecting the fog drops, so that the advantages of the water-sensitive paper in the aspect of fog drop deposition are maintained, for example, clear water can be used, the wind tunnel is not polluted, and the particle size distribution of the fog drops can be counted. And the measuring instrument of the droplet particle size analyzer is not needed, so that the measuring cost is reduced. Meanwhile, as the rotation of the rotating component can control the water-sensitive paper to be exposed to the outside so as to collect fog drops, and can also control the water-sensitive paper to be isolated from the outside before the water-sensitive paper is saturated, the defect that the water-sensitive paper is easy to saturate is avoided, and the water-sensitive paper can be applied to fields, orchards and other fields for measuring fog drop deposition, canopy penetrability and other scenes and can also be applied to wind tunnels.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic view showing the construction of a mist collecting rack in an embodiment of the present invention;
FIG. 2 shows a schematic view of the installation of a rotating assembly with a water-sensitive paper in accordance with an embodiment of the present invention;
FIG. 3 shows a schematic cross-sectional view of an inner tube in an embodiment of the invention;
FIG. 4 is a schematic view showing that a water-sensitive paper is mounted on an inner tube in an embodiment of the present invention;
FIG. 5 shows a schematic cross-sectional view of an inner layer tube, an outer layer tube and a water-sensitive paper in an embodiment of the present invention;
FIG. 6 shows a schematic installation of a rotating assembly and water-sensitive paper in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view showing the structure of a rack-type linkage structure according to an embodiment of the present invention;
FIG. 8 is a schematic view showing the installation of a rack-type linkage and a mounting bracket according to an embodiment of the present invention;
reference numerals illustrate:
1-mounting a bracket; 2-a cross beam; 21-an outer tube; 22-inner tube; 3-water sensitive paper; 221-a first part; 222-a second portion; 4-a waterproof foam pad; 23. 24-metal plate.
Detailed Description
The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
In a first aspect, the present invention provides an apparatus for measuring the spatial distribution of mist drifts in a wind tunnel, as shown in fig. 1, the apparatus comprising a mist collection rack adapted to be placed in the wind tunnel, the mist collection rack comprising a mounting bracket 1 and a plurality of cross beams 2 mounted to the mounting bracket 1, each cross beam 2 comprising a rotating assembly and a water-sensitive paper mounted on the rotating assembly, rotation of the rotating assembly being capable of exposing the water-sensitive paper to the outside or isolating the water-sensitive paper from the outside.
In the device for measuring the drift space distribution condition of the fog drops in the wind tunnel, the water-sensitive paper is adopted to collect the fog drops, so that the advantages of the water-sensitive paper in the aspect of fog drop deposition are maintained, for example, clear water can be adopted, the wind tunnel is not polluted, the particle size distribution condition of the fog drops can be counted, and the like. And the measuring instrument of the droplet particle size analyzer is not needed, so that the measuring cost is reduced. Meanwhile, as the rotation of the rotating component can control the water-sensitive paper to be exposed to the outside so as to collect fog drops, and can also control the water-sensitive paper to be isolated from the outside before the water-sensitive paper is saturated, the defect that the water-sensitive paper is easy to saturate is avoided, and the water-sensitive paper can be applied to fields, orchards and other fields for measuring fog drop deposition, canopy penetrability and other scenes and can also be applied to wind tunnels. Meanwhile, by the device, the interference of the wind field to the water-sensitive paper can be avoided, and the measurement accuracy is improved.
In specific implementation, the size of the mounting bracket 1 can be adjusted according to the specific size of the wind tunnel test section and the mounting position of the nozzle, for example, the cross section of the wind tunnel test section is about 2×2m, the mounting height of the nozzle is 0.8m, and the size of the mounting bracket 1 which can be adopted is 0.8m high×1.8m wide. The mounting bracket 1 and/or the cross beam 2 may be made of aluminum alloy, 45 steel, or other materials. Moreover, the number and spacing of the cross beams 2 can be adjusted according to the requirements of test accuracy, and the spacing is generally not less than 10cm.
In the practical implementation, the rotating assembly has various structural forms, such as a sleeve rotating assembly and a cover plate rotating assembly, and can be selected according to the needs in practical application, so that the invention is not limited.
With reference to fig. 2 to 5, an alternative structure of the rotating assembly is: the rotating assembly comprises a double-layer sleeve, a mounting notch for mounting the water-sensitive paper 3 is formed in the outer wall of an inner layer tube 22 of the double-layer sleeve, an outer layer tube 21 of the double-layer sleeve comprises an exposed portion and an isolation portion, the exposed portion is used for exposing the water-sensitive paper 3, and the isolation portion is used for isolating the water-sensitive paper 3 from the outside.
The rotating assembly with the structure can not only enable the water-sensitive paper 3 arranged at the position of the installation notch of the inner layer pipe 22 to be exposed to the outside, but also enable the water-sensitive paper 3 arranged at the position of the installation notch of the inner layer pipe 22 to be isolated from the outside through the rotation between the inner layer pipe 22 and the outer layer pipe 21, so that the water-sensitive paper 3 can collect fog drops or prevent the water-sensitive paper 3 from collecting fog drops. The rotating assembly with the structure is simple in structure, easy to realize and convenient to operate.
In the rotating assembly of the above-described structure, the thickness and size of the inner tube 22 and the outer tube 21 may be set as desired, for example, the outer tube diameter is between 10mm and 30 mm.
In the rotating assembly of the above structure, the shape of the mounting notch can be set as required, as long as the water sensitive paper 3 can be fixedly mounted, wherein one optional mounting notch is as follows: the mounting notch comprises two parts arranged along the radial direction of the inner tube 22, the first part 221 is close to the center of the inner tube 22 relative to the second part 222, and the central angle of the first part 221 is larger than that of the second part 222.
In the installation notch of the structure, the central angle of the first part 221 is larger than that of the second part 222, so that the arc length of the first part 221 is larger than that of the second part 222, and the water-sensitive paper 3 can be clamped in the first part 221. The size of the water-sensitive paper 3 is matched with the arc length of the first portion 221, and the arc angle when the water-sensitive paper 3 is installed in the first portion 221 may be 90 ° to 120 °.
In the rotating assembly of the above structure, a waterproof sponge pad 4 may be provided on the inner wall of the isolated portion of the outer tube 21, which can effectively block fine mist droplets in the air from contaminating the water-sensitive paper 3.
The foregoing describes a bushing rotating assembly, and the following describes a cover plate rotating assembly: referring to fig. 6, the rotating assembly includes two pivoted metal plates 23, 24, and the water sensitive paper 3 is sandwiched between the two metal plates 23, 24.
Since the two metal plates are pivoted, the two metal plates can be opened or closed by rotating one of the metal plates with the water-sensitive paper 3 interposed therebetween, and thus the water-sensitive paper 3 can be exposed to the outside or the water-sensitive paper 3 can be isolated from the outside by rotating one of the metal plates.
In the cover plate type rotating assembly, a waterproof sponge cushion 4 can be arranged on the edge of the metal plate so as to effectively prevent fine mist drops in air from polluting the water-sensitive paper 3. The shape of the metal plate can be selected according to the need, for example, an L-shaped metal plate, so that the waterproof sponge cushion 4 can be arranged on the lower short edge and the side edge of the metal plate. In addition, the size of the metal plate may be set as desired, for example, the lower short side edge of the metal plate is 5mm long and the side edge is 10 to 20mm long. Wherein the pivoting of the two metal plates can be achieved by a hinged connection.
Regardless of the structure of the rotating assembly, the rotation of the rotating assembly can be controlled manually or not only by a stepping motor, in the control process of the stepping motor, the single control of the stepping motor can be directly adopted, or the linkage control of the rack type linkage structure shown in fig. 7 can be adopted, and as shown in fig. 8, the rack type linkage structure in the linkage control mode is arranged on the mounting bracket 1 and is connected with the stepping motor and the rotating assembly.
The invention also provides a method for measuring the drift space distribution condition of the fog drops in the wind tunnel, which is carried out based on the device for measuring the drift space distribution condition of the fog drops in the wind tunnel.
In particular embodiments, the method may be performed on the basis of an apparatus comprising a telescoping rotating assembly, or may be performed on the basis of an apparatus comprising a flap rotating assembly. The method for measuring the drift space distribution condition of the fog drops in the wind tunnel by the device based on the sleeve type rotating assembly comprises the following steps:
arranging a spray head for spraying mist drops in a test section of the wind tunnel;
arranging the mounting bracket 1 at a preset position downwind from the spray head, and arranging a plurality of outer layer pipes 21 on the mounting bracket 1;
the water-sensitive paper 3 is arranged in the installation notch of the inner layer pipe 22;
the inner layer tube 22 is arranged in the outer layer tube 21, the inner layer tube 22 is rotated to isolate the water sensitive paper 3 from the outside, and a wind tunnel and the spray head are opened;
after the spray drops sprayed by the spray head reach a uniform and stable state, rotating the inner layer tube 22 to expose the water-sensitive paper 3 to the outside, so that the water-sensitive paper 3 collects the spray drops;
before the water-sensitive paper 3 is saturated, the inner layer tube 22 is rotated to isolate the water-sensitive paper 3 from the outside, and the wind tunnel and the spray head are closed;
the inner layer tube 22 is drawn out, the water sensitive paper 3 is taken down, the water sensitive paper 3 is scanned, and the fog drop drift space distribution condition is analyzed according to the scanning result.
The method for measuring the drift space distribution condition of the fog drops in the wind tunnel by the device based on the cover plate type rotating assembly comprises the following steps:
arranging a spray head for spraying mist drops in a test section of the wind tunnel;
arranging the mounting bracket 1 at a preset position which is downwind from the spray head, and arranging a plurality of rotating assemblies which mainly consist of two pivoted metal plates on the mounting bracket 1;
setting water-sensitive paper 3 between the two metal plates, covering the two metal plates, and starting the wind tunnel and the spray head;
after the spray drops sprayed by the spray head reach a uniform and stable state, rotating one of the metal plates to expose the water-sensitive paper 3 to the outside, so that the water-sensitive paper 3 collects fog drops;
before the water-sensitive paper 3 is saturated, covering two metal plates to isolate the water-sensitive paper 3 from the outside, and closing the wind tunnel and the spray head;
and rotating one of the metal plates, taking down the water-sensitive paper 3, scanning the water-sensitive paper 3, and analyzing the fog drop drift space distribution condition according to the scanning result.
According to the method, the fog drop deposition amounts of different spatial positions and the spatial distribution conditions of fog drops with different particle diameters can be obtained under the condition that the wind tunnel flow field is not interfered, so that the drift deposition characteristics of the fog drops can be analyzed more carefully.
It can be appreciated that the method for measuring the drift space distribution situation of the mist in the wind tunnel has the same beneficial effects as the device for measuring the drift space distribution situation of the mist in the wind tunnel, and is not repeated here. Also, the explanation, optional implementation method, etc. of the content may refer to the corresponding parts, and are not repeated here.
In the description of the present invention, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for measuring the drift space distribution of mist drops in a wind tunnel, which is characterized in that a measuring device comprises a mist drop collecting frame suitable for being placed in the wind tunnel, wherein the mist drop collecting frame comprises a mounting bracket and a plurality of cross beams mounted on the mounting bracket, each cross beam comprises a rotating component and water-sensitive paper mounted on the rotating component, and the rotation of the rotating component can expose the water-sensitive paper to the outside or isolate the water-sensitive paper from the outside;
the rotating assembly comprises a double-layer sleeve, a mounting notch for mounting the water-sensitive paper is formed in the outer wall of an inner layer tube of the double-layer sleeve, the outer layer tube of the double-layer sleeve comprises an exposing part and a separating part, the exposing part is used for exposing the water-sensitive paper, and the separating part is used for separating the water-sensitive paper from the outside;
the method comprises the following steps:
arranging a spray head for spraying mist drops in a test section of the wind tunnel;
arranging the mounting bracket at a preset position below the spray head, and arranging a plurality of outer layers of pipes on the mounting bracket;
installing water-sensitive paper in the installation notch of the inner layer pipe;
the inner layer pipe is arranged in the outer layer pipe, the inner layer pipe is rotated to isolate the water-sensitive paper from the outside, and a wind tunnel and the spray head are opened;
after the spray drops sprayed by the spray head reach a uniform and stable state, rotating the inner layer pipe to expose the water-sensitive paper to the outside so as to enable the water-sensitive paper to collect fog drops;
before the water-sensitive paper is saturated, the inner layer pipe is rotated to isolate the water-sensitive paper from the outside, and the wind tunnel and the spray head are closed;
and (3) extracting the inner layer tube, taking down the water-sensitive paper, scanning the water-sensitive paper, and analyzing the fog drop drift space distribution condition according to a scanning result.
2. The method of claim 1, wherein the mounting notch comprises two portions disposed radially of the inner tube, a first portion being adjacent to a center of the inner tube relative to a second portion, the first portion having a larger center angle than the second portion.
3. A method according to claim 1 or 2, wherein the inner wall of the insulation portion of the outer tube is provided with a water-barrier foam-rubber cushion.
4. The method of claim 1, further comprising a stepper motor for controlling rotation of the rotating assembly.
5. The method of claim 4, further comprising a rack-type linkage disposed on the mounting bracket, the rack-type linkage being coupled to the stepper motor and the rotating assembly.
6. A method for measuring the drift space distribution of mist drops in a wind tunnel, which is characterized in that a measuring device comprises a mist drop collecting frame suitable for being placed in the wind tunnel, wherein the mist drop collecting frame comprises a mounting bracket and a plurality of cross beams mounted on the mounting bracket, each cross beam comprises a rotating component and water-sensitive paper mounted on the rotating component, and the rotation of the rotating component can expose the water-sensitive paper to the outside or isolate the water-sensitive paper from the outside;
the rotating assembly comprises two pivoted metal plates, and the water-sensitive paper is clamped between the two metal plates;
the method comprises the following steps:
arranging a spray head for spraying mist drops in a test section of the wind tunnel;
arranging the mounting bracket at a preset position below the spray head, and arranging a plurality of rotating assemblies comprising two pivoted metal plates on the mounting bracket;
setting water-sensitive paper between two metal plates, covering the two metal plates, and starting the wind tunnel and the spray head;
after the spray drops sprayed by the spray head reach a uniform and stable state, rotating one of the metal plates to expose the water-sensitive paper to the outside, so that the water-sensitive paper collects fog drops;
before the water-sensitive paper is saturated, covering two metal plates to isolate the water-sensitive paper from the outside, and closing the wind tunnel and the spray head;
and rotating one of the metal plates, taking down the water-sensitive paper, scanning the water-sensitive paper, and analyzing the fog drop drift space distribution condition according to a scanning result.
7. The method of claim 6, wherein the two metal plates are provided with a waterproof foam pad on their edges.
8. The method of claim 6 or 7, wherein the two metal plates are both L-shaped metal plates.
9. The method of claim 6, further comprising a stepper motor for controlling rotation of the rotating assembly.
10. The method of claim 9, further comprising a rack-type linkage disposed on the mounting bracket, the rack-type linkage being coupled to the stepper motor and the rotating assembly.
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| CN201611258034.6A CN106768819B (en) | 2016-12-30 | 2016-12-30 | Device and method for measuring drift space distribution condition of fog drops in wind tunnel |
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| CN201611258034.6A CN106768819B (en) | 2016-12-30 | 2016-12-30 | Device and method for measuring drift space distribution condition of fog drops in wind tunnel |
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| CN110702365B (en) | 2019-10-30 | 2021-08-03 | 北京农业智能装备技术研究中心 | Atomization efficiency evaluation system and method |
| CN111044247A (en) * | 2019-11-29 | 2020-04-21 | 北京农业智能装备技术研究中心 | Pesticide fog droplet drift testing arrangement |
| CN113176066B (en) * | 2021-03-03 | 2022-11-29 | 华南农业大学 | Method and device for collecting and distributing fog drops in wind tunnel |
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