Experimental device and experimental method for aerosol diffusion and settlement wind tunnel simulation

Abstract

The invention relates to the technical field of atmospheric boundary layer wind tunnel simulation, and provides an experimental device and an experimental method for aerosol diffusion and settlement wind tunnel simulation, and the experimental device comprises a wind tunnel simulation device, an aerosol generation device, a ground simulation device and a turbulence simulation device. The wind tunnel simulation device comprises a fan and a simulation chamber, the simulation chamber is provided with an air channel extending in the first direction and an air inlet and an air outlet located in the two ends of the air channel, and the fan is used for providing airflow for the air inlet; the aerosol generating device is provided with an outlet end, and the outlet end is used for providing aerosol into the air duct; the ground simulation device comprises a floor and a heating device, and the floor is arranged on the bottom plate of the simulation chamber and located in the air duct; the heating device is used for providing heat for the floor; the turbulence simulation device comprises a wedge module and a roughness element module; and the measuring system is used for acquiring diffusion and settlement parameters of the aerosol. According to the experimental device and the experimental method provided by the embodiment of the invention, diffusion and settlement parameters of aerosol under different conditions can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of wind tunnel simulation of the atmospheric boundary layer, and in particular to an experimental device and an experimental method for wind tunnel simulation of aerosol diffusion and sedimentation. Background Art

[0002] In the relevant technology, nuclear reactors will release a variety of radioactive and non-radioactive aerosols in the event of an accident. The aerosols diffuse into the air and will undergo diffusion dilution, condensation sedimentation, chemical conversion and other processes under the action of convection, which may have adverse effects on the human body and the environment. For example, the sodium-cooled fast reactor is a reactor that uses liquid sodium as a coolant and is one of the main reactor types of the fourth-generation nuclear energy system. In the event of an accident where equipment or pipelines fail or rupture, the sodium-cooled fast reactor will cause leakage of metallic sodium and combustion, generating sodium oxides, hydroxides and other combustion products, which diffuse into the air in the form of aerosols. Therefore, it is necessary to study the diffusion and sedimentation parameters of the aerosol after release, which is of great significance for conducting environmental impact assessments of nuclear energy systems and nuclear accident consequence assessments. Summary of the invention

[0003] In view of this, the present application embodiment is intended to provide an experimental device and an experimental method for wind tunnel simulation of aerosol diffusion and deposition, which can obtain the diffusion and deposition parameters of aerosols under different conditions. The experimental device includes:

[0004] A wind tunnel simulation device, comprising a fan and a simulation chamber, wherein the simulation chamber has a wind channel extending along a first direction and an air inlet and an air outlet located at two ends of the wind channel, and the fan is used to provide airflow to the air inlet;

[0005] an aerosol generating device having an outlet end for providing aerosol into the air duct;

[0006] A ground simulation device, comprising a floor and a heating device, wherein the floor is arranged on the bottom plate of the simulation room and is located in the air duct, and the heating device is used to provide heat to the floor so that the air duct has a temperature difference in the up-down direction;

[0007] A turbulence simulation device, used for simulating the turbulence structure of an atmospheric boundary layer, the turbulence simulation device comprising a wedge module and a rough element module, the wedge module being arranged in the air duct and close to the air inlet, the wedge module comprising a plurality of wedges arranged along a second direction, the rough element module being arranged in the air duct and located on the inner side of the wedge module, the rough element module comprising a plurality of rough elements arranged along the first direction and the second direction, the first direction, the second direction and the up-down direction being perpendicular to each other;

[0008] The measuring system is used to obtain the diffusion and deposition parameters of the aerosol in the air duct.

[0009] In some embodiments, the experimental device further comprises:

[0010] A first driving member is provided on at least one of the turbulence simulation device and the simulation chamber, and is used to drive the upper end of the wedge to tilt toward the second direction at a preset angle; and / or,

[0011] The second driving member is disposed on at least one of the turbulence simulation device and the simulation chamber, and is used to drive the roughness element to move in an up-down direction.

[0012] In some embodiments, the rough element module is disposed adjacent to the wedge module.

[0013] In some embodiments, the aerosol generating device comprises:

[0014] an aerosol generating module, disposed on the simulation chamber, for generating aerosol;

[0015] an aerosol release tube, comprising a tube body and the outlet end connected to each other, wherein the outlet end is connected to the aerosol generating module through the tube body to release the aerosol into the air duct;

[0016] The third driving member is used to drive the outlet end to move in the up-down direction.

[0017] In some embodiments, the cross-sectional diameter of the outlet end is larger than the cross-sectional diameter of the tube body.

[0018] In some embodiments, the measurement system comprises:

[0019] A recording module, used for recording the motion parameters of the aerosol in the air duct located downwind of the outlet end;

[0020] An analysis module is used to analyze the motion parameters to obtain the diffusion sedimentation parameters.

[0021] In some embodiments, the diffusion sedimentation parameters include vertical diffusion parameter, spanwise diffusion parameter, terminal sedimentation velocity, Richardson number and particle size.

[0022] In some embodiments, the recording module includes:

[0023] A first recording unit, used for recording aerosols within a first preset range from the outlet end, wherein the first recording unit is disposed on at least one side of the ground simulation device along the first direction to obtain movement parameters of the aerosols along the up and down directions;

[0024] The second recording unit is used to record the aerosol within a second preset range from the outlet end, and the second recording unit is arranged on the top plate of the simulation chamber to obtain the movement parameters of the aerosol along the second direction.

[0025] In some embodiments, the first recording unit includes a plurality of cameras, and the plurality of cameras are spaced apart along a first direction; the second recording unit includes a plurality of cameras, and the plurality of cameras are spaced apart along the first direction.

[0026] In some embodiments, the height of the outlet end from the floor in the up-down direction is a first dimension, the spatial range of a second dimension extending from the outlet end in the up-down direction is the first preset range, and the spatial range of a second dimension extending from the outlet end in the second direction is the second preset range;

[0027] Wherein, the first size does not exceed a preset value of the boundary layer thickness; and / or, the second size is not less than five times the first size.

[0028] In some embodiments, the experimental device further comprises:

[0029] The Doppler particle dynamic analyzer is arranged on at least one side of the ground simulation device along the first direction, and is used for preliminarily obtaining the motion parameters and particle size of the aerosol.

[0030] In some embodiments, the experimental device further comprises:

[0031] A pressure scanning valve and a Pitot tube, wherein the pressure scanning valve is arranged on the top plate of the simulation chamber; the Pitot tube is connected to the pressure scanning valve, and at least part of the Pitot tube is located in the air duct to obtain the wind speed in the air duct; one end of the Pitot tube located in the air duct is located on the side of the outlet end away from the air outlet.

[0032] In some embodiments, the experimental device comprises:

[0033] a first temperature sensor, used to obtain a temperature of the airflow in the air duct at a preset height from the floor as a first temperature;

[0034] The second temperature sensor is used to obtain the temperature of the floor as a second temperature.

[0035] In some embodiments, the experimental device further comprises:

[0036] The aerosol recovery device is arranged in the air duct and close to the air outlet, and is used for collecting the aerosol flowing toward the air outlet.

[0037] In some embodiments, the aerosol recovery device comprises:

[0038] A spray module, disposed on the top plate of the simulation chamber, for providing liquid to settle the aerosol;

[0039] The collecting module is arranged on the floor and is used for collecting the liquid mixed with the aerosol.

[0040] In some embodiments, the experimental device further comprises:

[0041] The rainfall simulation device comprises a rainfall simulation module and a rainfall sensor. The rainfall simulation module is arranged on the top plate of the simulation room and is used to provide droplets into the air duct to simulate rainfall. The rainfall sensor is arranged on the floor and is used to obtain rainfall parameters.

[0042] In some embodiments, the rainfall simulation device further comprises:

[0043] The controller is electrically connected to the rainfall simulation module and the rainfall sensor respectively, and is used for adjusting the rainfall of the rainfall simulation module according to the rainfall parameter.

[0044] The experimental device provided in the embodiment of the present application can obtain the diffusion and sedimentation parameters of aerosols under different conditions by adjusting at least one of the turbulence simulation device, the ground simulation device, the wind tunnel simulation device and the aerosol generating device.

[0045] The present application also provides an experimental method for wind tunnel simulation of aerosol diffusion and precipitation, using any of the above experimental devices to conduct an experiment, the experimental method comprising:

[0046] providing an aerosol into the air duct;

[0047] providing airflow to the air duct to diffuse the aerosol;

[0048] Obtain the diffusion and deposition parameters of aerosols.

[0049] In some embodiments, the step of obtaining the diffusion and deposition parameters of the aerosol includes:

[0050] A preset position is selected in the air duct, wherein the distance between the preset position and the floor in the up-down direction is a preset height L1;

[0051] The temperature of the airflow at the preset position is obtained as a first temperature T hot ;

[0052] The temperature of the floor is obtained as a second temperature T ref ;

[0053] Obtaining the flow velocity v of the airflow;

[0054] The Richardson number is calculated, specifically, the Richardson number is calculated according to the following functional relationship:

[0055]

[0056] Where β is the thermal expansion coefficient of the airflow, and g is the acceleration due to gravity.

[0057] In some embodiments, the step of obtaining the diffusion and deposition parameters of the aerosol includes:

[0058] Obtaining a distance x between the aerosol at a preset position and the outlet end of the aerosol generating device;

[0059] The standard deviation of the concentration distribution of the aerosol at the preset position along the second direction in the air duct is obtained as the spanwise diffusion parameter σ y ;

[0060] The spanwise diffusion coefficient a and the spanwise diffusion coefficient p are calculated, specifically, the spanwise diffusion coefficient a and the spanwise diffusion coefficient p are calculated according to the following functional relationship:

[0061] σ y =a*x p .

[0062] In some embodiments, the step of obtaining the diffusion and deposition parameters of the aerosol includes:

[0063] Obtaining a distance s between the aerosol at a preset position and the outlet end of the aerosol generating device;

[0064] The standard deviation of the aerosol concentration distribution in the vertical direction of the air duct at the preset position is obtained as the vertical diffusion parameter σ z ;

[0065] The vertical diffusion coefficient b and the vertical diffusion coefficient q are calculated, specifically, the vertical diffusion coefficient b and the vertical diffusion coefficient q are calculated according to the following functional relationship:

[0066] σ z =b*s q .

[0067] In some embodiments, the experimental method comprises:

[0068] The rough element is driven to move in the up-down direction and / or the upper end of the wedge is driven to tilt toward the second direction at a preset angle, so as to obtain the diffusion sedimentation parameters under different conditions.

[0069] In some embodiments, the experimental method comprises:

[0070] The heating power of the heating device is adjusted and / or the floor with different roughness is replaced to obtain the diffusion sedimentation parameters under different conditions.

[0071] The experimental method provided in the embodiment of the present application uses the above-mentioned experimental device to conduct experiments, and has the same beneficial effects as the above-mentioned experimental device.

[0072] The present application also provides an experimental method for wind tunnel simulation of aerosol diffusion and precipitation. In some embodiments, an experiment is performed using any of the experimental devices described above. The experimental method includes:

[0073] providing liquid droplets into the air duct to simulate rainfall;

[0074] providing an aerosol into the air duct;

[0075] providing airflow to the air duct to diffuse the aerosol;

[0076] Obtain the diffusion and deposition parameters of aerosols.

[0077] In some embodiments, the experimental method comprises:

[0078] The rainfall per unit time of the rainfall simulation device is adjusted to obtain the diffusion sedimentation parameters under different conditions.

[0079] In this way, a wet deposition environment can be simulated. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 It is a structural schematic diagram of an experimental device in one embodiment of the present application;

[0081] Figure 2 for Figure 1 A schematic diagram of the structure of the experimental device from a second perspective;

[0082] Figure 3 for Figure 1 A schematic diagram of the structure of the third viewing angle of the experimental device shown;

[0083] Figure 4 for Figure 3 A magnified view of the experimental device shown;

[0084] Figure 5 A schematic diagram of the experimental method in one embodiment of the present application;

[0085] Figure 6 It is a schematic diagram of the flow of the experimental method in another embodiment of the present application.

[0086] Description of Reference Numerals

[0087] 100, experimental device; 10, wind tunnel simulation device; 11, simulation room; 11a, wind duct; 11b, air inlet; 11c, air outlet; 20, aerosol generating device; 21, aerosol generating module; 22, aerosol releasing tube; 221, outlet end; 222, tube body; 30, ground simulation device; 31, floor; 40, turbulence simulation device; 41, wedge module; 42, rough element module; 50, measurement system; 51, recording module; 511, first recording unit; 512, second recording unit; 60, Doppler particle dynamic analyzer; 70, Pitot tube; 80, aerosol recovery device; 81, spray module; 90, rainfall simulation device; 91, rainfall simulation module; 92, rainfall sensor; X, first direction; Y, second direction; Z, up and down direction. DETAILED DESCRIPTION

[0088] The following is a further detailed description of the implementation of the present application in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present application but cannot be used to limit the scope of the present application.

[0089] It should be noted that in the embodiments of the present application, the orientations or positional relationships such as "up", "down", "first direction", and "second direction" are based on the orientations or positional relationships shown in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0090] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0091] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature “on” a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact via an intermediate medium.

[0092] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine different embodiments or examples described in this application and the features of different embodiments or examples without contradiction.

[0093] In the relevant technology, nuclear reactors will release a variety of radioactive and non-radioactive aerosols in the event of an accident. The aerosols diffuse into the air and will undergo diffusion dilution, condensation sedimentation, chemical conversion and other processes under the action of convection, which may have adverse effects on the human body and the environment. For example, the sodium-cooled fast reactor is a reactor that uses liquid sodium as a coolant and is one of the main reactor types of the fourth-generation nuclear energy system. Under accident conditions such as equipment or pipeline failure and rupture, the sodium-cooled fast reactor will cause metallic sodium to leak and burn, generating sodium oxides, hydroxides and other combustion products, which diffuse into the air in the form of aerosols. The movement of sodium compound aerosols in the atmospheric boundary layer is generally affected by three factors: turbulent diffusion, Brownian diffusion, and gravitational sedimentation. By changing the experimental device to obtain the diffusion and sedimentation parameters of aerosols under different conditions, it is of great significance for the location of the construction of the sodium-cooled reactor, the concentration of sodium aerosols released per unit time by the sodium-cooled reactor, and environmental risk assessment.

[0094] In view of this, please refer to Figure 1-Figure 3The embodiment of the present application provides an experimental device 100 for wind tunnel simulation of aerosol diffusion and sedimentation, including a wind tunnel simulation device 10, an aerosol generating device 20, a ground simulation device 30 and a turbulence simulation device 40. The wind tunnel simulation device 10 includes a fan and a simulation chamber 11, the simulation chamber 11 has an air duct 11a extending along a first direction and an air inlet 11b and an air outlet 11c located at both ends of the air duct 11a, the fan is used to provide airflow to the air inlet 11b; the aerosol generating device 20 has an outlet end 221, and the outlet end 221 is used to provide aerosol into the air duct 11a; the ground simulation device 30 includes a floor 31 and a heating device, the floor 31 is arranged on the bottom plate of the simulation chamber 11 and is located in the air duct 11a; the heating device is used to provide heat to the floor 31 so that the air duct 11a has a temperature in the up and down directions. difference; the turbulence simulation device 40 is used to simulate the turbulence structure of the atmospheric boundary layer; the turbulence simulation device includes a wedge module 41 and a rough element module 42; the wedge module 41 is arranged in the wind duct 11a and close to the air inlet 11b, the wedge module 41 includes a plurality of wedges arranged along the second direction, the rough element module 42 is arranged in the wind duct 11a and located on the inner side of the wedge module 41, the rough element module 42 includes a plurality of rough elements arranged along the first direction and the second direction, the first direction, the second direction and the up and down directions are perpendicular to each other; the measurement system 50 is used to obtain the diffusion and deposition parameters of the aerosol. Figure 1-Figure 3 In the figure, X represents the first direction, Y represents the second direction, and Z represents the up and down direction. Exemplarily, the aerosol generating device 20 and the measuring system 50 are arranged on the simulation chamber 11.

[0095] It is understandable that in order to improve the safety of the experiment, the experimental device 100 is placed in a laboratory for research. For example, the laboratory is a closed laboratory to reduce the possibility of aerosol leaking into the air and affecting the human body and the environment. Exemplarily, the aerosol can be an aerosol of a sodium compound, such as sodium hydroxide.

[0096] After the fan provides airflow into the air duct 11a, the aerosol is released from the outlet end 221 so that the aerosol moves under the action of the airflow, diffuses and settles. Among them, the fan can provide different wind speeds. The motion parameters of the aerosol can be recorded and processed by the measurement system 50. The motion parameters include but are not limited to speed, concentration and particle size. The diffusion and sedimentation parameters of the aerosol under different conditions can be obtained by analyzing the motion parameters. Exemplarily, the diffusion and sedimentation parameters include vertical diffusion parameters, span diffusion parameters, final sedimentation velocity, Richardson number and particle size. Among them, the final sedimentation velocity refers to the vertical velocity component of the aerosol pointing to the ground simulation device 30 at a height preset distance from the ground simulation device 30. The standard deviation of the concentration distribution of the aerosol at the preset position in the air duct along the second direction Y is the span diffusion parameter, and the standard deviation of the concentration distribution of the aerosol at the preset position in the air duct along the up and down direction Z is the vertical diffusion parameter. In the atmosphere, the Richardson number represents the ratio of atmospheric static stability to vertical wind shear. Exemplarily, the preset distance can be 5mm. By adjusting the floor 31 and the heating device of the ground simulation device 30, and at least one of the wedge module 41 and the rough element module 42 of the turbulence simulation device 40, the diffusion and deposition parameters under different conditions can be obtained and the diffusion and deposition laws of the aerosol can be analyzed.

[0097] Aerosols include but are not limited to aerosols of sodium compounds. The simulation chamber 11 is provided with openings on both sides along the first direction X to form an air inlet 11b and an air outlet 11c. An air flow is provided to the air inlet 11b by a fan.

[0098] For example, see Figure 1-Figure 3 The outlet end 221 is disposed in a release direction toward the air outlet 11c. The outlet end 221 is located in the middle of the air duct 11a along the first direction X.

[0099] The fan, the simulation chamber 11, the wedge module 41 and the rough element module 42 can simulate the wind field of the atmospheric boundary layer. The shape of the wedge is wide at the bottom and narrow at the top. The wedge module 41 can simulate the influence of terrain on the airflow, such as mountains and hills, and form a larger-scale vortex in the wind duct 11a; the rough element module 42 is used to simulate the actual ground environment, such as vegetation, buildings, natural terrain, etc., and can increase the turbulence intensity. Exemplarily, the lower end of the wedge is set at an edge of the bottom plate of the simulation chamber 11, corresponding to the position of the air inlet 11b. The wedge module 41, the rough element module 42 and the floor 31 of the ground simulation device 30 are arranged in sequence along the first direction X. The rough element module 42 is connected to the floor 31. One end of the floor 31 is connected to the lower end of the rough element module 42, and the other end of the floor 31 is located at another edge of the bottom plate of the simulation chamber 11, corresponding to the position of the air outlet 11c.

[0100] The dimensions of the wind tunnel, the wedge and the rough element can be adaptively set according to the experimental requirements. Exemplarily, the simulation chamber 11 is in the shape of a cuboid. The dimension of the wind tunnel along the second direction Y is 1300 mm, and the extension dimension of the wind tunnel along the first direction X is 90000 mm. The dimension of the wind tunnel along the up-down direction Z is 14500 mm, the height dimension of the wedge along the up-down direction Z is 800 mm, the extension dimension of the rough element along the first direction X is 50 mm, the extension dimension of the rough element along the second direction Y is 100 mm, and the extension dimension of the rough element along the up-down direction Z is 80 mm. It can be understood that, if space permits, the extension dimension of the simulation chamber 11 along the first direction X can be appropriately increased, which is conducive to selecting a larger recording range.

[0101] The turbulence simulation device 40 is used to simulate the turbulence properties of the atmospheric boundary layer. By adjusting the wedge module 41 and the rough element module 42 to simulate the atmospheric boundary layer with different turbulence structures, the boundary layer thickness, friction speed, and turbulence degree can be adjusted. The Richardson number can also be adjusted by adjusting the wedge module 41 and the rough element module 42. For example, when studying the effects of other conditions on diffusion and sedimentation parameters, the Richardson number can be set to 0 by adjusting the wedge module 41 and the rough element module 42 to obtain an atmospheric boundary layer under neutral conditions.

[0102] By changing the roughness of the floor 31, different surface roughnesses can be simulated. By adjusting the temperature of the floor 31, the heat exchange between the surface and the atmosphere can be simulated. The heat is transferred from bottom to top by the heating device, so that the air duct 11a has a temperature difference along the up-down direction Z, and the airflow below and the airflow above form a temperature inverse gradient to simulate the atmospheric boundary layer under unstable conditions. Exemplarily, the temperature of the floor 31 is 99°C, and if the conditions of the experimental device 100 permit, it can be further increased to increase the temperature gradient. Exemplarily, the floor 31 is a metal plate, such as an aluminum plate, and the heating device is at least partially disposed in the cavity of the metal plate.

[0103] The experimental device 100 provided in the embodiment of the present application can obtain the diffusion and sedimentation parameters of the aerosol under different conditions by adjusting at least one of the turbulence simulation device 40, the ground simulation device 30, the wind tunnel simulation device 10 and the aerosol generating device 20.

[0104] In some embodiments, the experimental device 100 includes a first driving member, which is disposed on at least one of the turbulence simulation device 40 and the simulation chamber 11 and is used to drive the upper end of the wedge to tilt toward the second direction Y at a preset angle.

[0105] The driving mode of the first driving member is not limited, and may be a cylinder, an oil cylinder or a motor, etc. For example, the first driving member may be a servo motor, which can improve the accuracy of controlling the tilt angle of the upper end of the wedge toward the second direction Y.

[0106] In some embodiments, the experimental device 100 includes a second driving member, which is disposed on at least one of the turbulence simulation device 40 and the simulation chamber 11 and is used to drive the roughness element to move along the up-down direction Z.

[0107] The driving mode of the second driving member is not limited, and can be a cylinder, an oil cylinder or a motor, etc. For example, the second driving member can be a servo motor, which can improve the accuracy of controlling the moving size of the rough element along the vertical direction Z.

[0108] For some examples, see Figure 1-Figure 3 The rough element module 42 is disposed adjacent to the lower end of the wedge module 41. The possibility that the step formed by the lower end of the rough element module 42 and the wedge module 41 affects the flow field of the airflow can be reduced.

[0109] For some examples, see Figure 1-Figure 3 The experimental device 100 also includes a rainfall simulation device 90, which is arranged on the simulation room 11; the rainfall simulation device 90 includes a rainfall simulation module 91 and a rainfall sensor 92. The rainfall simulation module 91 is arranged on the top plate of the simulation room 11, and is used to provide droplets into the air duct 11a to simulate rainfall; the rainfall sensor 92 is arranged on the floor 31, and is used to obtain rainfall parameters. By setting the rainfall simulation device 90, the atmospheric boundary layer under wet deposition conditions can be simulated, and the diffusion and deposition parameters of aerosols under wet deposition conditions can be obtained. The rainfall parameter can be obtained by the rainfall sensor 92, and the rainfall parameter can be the total volume of droplets provided per unit time.

[0110] The use of the rainfall simulation device 90 can be adaptively selected according to the experimental requirements. For example, dry deposition and wet deposition can be compared through the rainfall simulation device 90. The experiment can be carried out without opening the rainfall simulation device 90 to obtain data under dry deposition conditions, and then the rainfall simulation device 90 can be opened to obtain data under wet deposition conditions. In other embodiments, the rainfall simulation device 90 can also be adjusted to the preset parameters without changing, and at least one of the turbulence simulation device 40, the ground simulation device 30, the wind tunnel simulation device 10 and the aerosol generating device 20 can be adjusted to obtain experimental data under wet deposition conditions. Or, when at least one of the turbulence simulation device 40, the ground simulation device 30, the wind tunnel simulation device 10 and the aerosol generating device 20 is adjusted, the rainfall simulation device 90 can also be adjusted.

[0111] In some embodiments, the rainfall simulation device 90 further includes a controller, which is connected to the rainfall simulation module 91 and the rainfall sensor 92, respectively, and is used to adjust the rainfall of the rainfall simulation module 91 according to the rainfall parameter. The rainfall parameter can be adjusted by the controller to obtain the diffusion and deposition parameters of the aerosol at different rainfall amounts.

[0112] For some examples, see Figure 1-Figure 3 The aerosol generating device 20 includes an aerosol generating module 21, an aerosol releasing tube 22 and a third driving member. The aerosol generating module 21 is arranged on the simulation chamber 11 and is used to generate aerosol; the aerosol releasing tube 22 has a tube body 222 and an outlet end 221 connected to each other, and the outlet end 221 is connected to the aerosol generating module 21 through the tube body 222 to release aerosol into the air duct 11a; the third driving member is used to drive the outlet end 221 to move along the up-down direction Z.

[0113] The position of the outlet end 221 in the up-down direction Z can be adjusted by the third driving member, and the distance between the outlet end 221 and the floor 31 can be adjusted to release aerosol at different preset heights.

[0114] The driving mode of the third driving member is not limited, and the driving can be realized by a cylinder, an oil cylinder or a motor, etc. For example, the third driving member can be a servo motor, which can improve the accuracy of controlling the moving dimension of the outlet end 221 in the vertical direction Z.

[0115] In some embodiments, the cross-sectional diameter of the outlet end 221 is larger than the cross-sectional diameter of the tube body 222 to reduce the release rate of the aerosol and simulate point source release. Exemplarily, the cross-sectional diameter of the outlet end 221 is D1, and the cross-sectional diameter of the tube body 222 is D2, and D1=1.5D2.

[0116] For some examples, see Figure 1-Figure 3 The measurement system 50 includes a recording module 51 and an analysis module. The recording module 51 is used to record the motion parameters of the aerosol located downwind of the outlet end 221 in the air duct 11a; the analysis module is used to analyze the motion parameters to obtain the diffusion and sedimentation parameters. The downwind direction refers to the direction from the air inlet 11b to the air outlet 11c. The motion parameters include but are not limited to the velocity, concentration and particle size of the aerosol.

[0117] For some examples, see Figure 1-Figure 3 The recording module 51 includes a first recording unit 511 and a second recording unit 512. The first recording unit 511 is used to record aerosols within a first preset range from the outlet end 221, and the first recording unit 511 is arranged on at least one side of the ground simulation device 30 along the first direction X to obtain the diffusion and sedimentation parameters of the aerosols along the up-down direction Z; the second recording unit 512 is used to record aerosols within a second preset range from the outlet end 221, and the second recording unit 512 is arranged on the top plate of the simulation chamber 11 to obtain the diffusion and sedimentation parameters of the aerosols along the second direction Y.

[0118] Exemplarily, the measurement system 50 is a PIV measurement system having a PIV measurement program capable of analyzing data acquired by the first recording unit 511 and the second recording unit 512 .

[0119] Exemplarily, the PIV measurement system further includes a synchronizer, a laser generator and a laser relay, and the synchronizer is used to make the laser generator and the laser relay, the first recording unit 511 and the second recording unit 512 work synchronously.

[0120] For example, see Figure 1-Figure 3 The experimental device 100 also includes a Doppler particle dynamic analyzer 60, which is arranged on at least one side of the ground simulation device 30 along the first direction X, and is used to preliminarily obtain the motion parameters and particle size of the aerosol.

[0121] The Doppler particle dynamic analyzer 60 can perform preliminary measurements on the motion parameters of the aerosol, such as velocity, concentration and particle size, and terminate the experiment in advance when the aerosol deteriorates or the aerosol particle size does not meet the measurement requirements.

[0122] After the data is acquired, the data of the PIV measurement system can be combined with the data acquired by the Doppler particle dynamic analyzer 60 for comparative analysis.

[0123] In some embodiments, the first recording unit 511 includes a plurality of cameras, and the plurality of cameras are arranged at intervals along the first direction X; the second recording unit 512 includes a plurality of cameras, and the plurality of cameras are arranged at intervals along the first direction X.

[0124] By shooting aerosols with a camera, the concentration and particle size of aerosols can be obtained. After multiple cameras are spliced ​​together, the distance moved by the aerosols per unit time can be obtained, and then the moving speed of the aerosols can be obtained. The spacing of multiple cameras can expand the spatial range of the recording. Exemplarily, the spacing between the cameras in the first recording unit 511 is the same. Exemplarily, the spacing between the cameras in the second recording unit 512 is the same.

[0125] It is understandable that the fields of view of multiple cameras in the first recording unit 511 have overlapping parts, and the fields of view of multiple cameras in the second recording unit 512 have overlapping parts, so as to facilitate the subsequent processing of camera images to obtain overall data, such as stitching the camera images.

[0126] Exemplarily, the camera and the Doppler particle dynamics analyzer 60 are used alternately to reduce the possibility that the laser of the Doppler particle dynamics analyzer 60 may damage the camera.

[0127] It is understandable that the first preset range and the second preset range obtained in the present application can be adaptively selected according to experimental requirements. Figure 3 and Figure 4The height of the outlet end 221 from the floor 31 along the up-down direction Z is a first dimension H1, the spatial range of the second dimension extending from the outlet end 221 along the up-down direction Z is a first preset range, and the spatial range of the second dimension extending from the outlet end 221 along the second direction is a second preset range. Figure 3 Where L represents the size of the wind tunnel along the vertical direction Z.

[0128] Exemplarily, the first dimension does not exceed a preset value of boundary layer thickness. The preset value of boundary layer thickness corresponds to the boundary layer thickness of the real atmosphere, which is calculated by proportional calculation. Exemplarily, the dimension of the wind tunnel along the vertical direction Z is 14500 mm, and the preset value of boundary layer thickness is 2000 mm.

[0129] Exemplarily, the second size is not less than five times the first size. Reduce the possibility that the first preset range and the second preset range are too small to affect the accuracy of the experimental data results. Exemplarily, the measurement system 50 is a PIV measurement system, and the PIV measurement system can observe a spatial range of thirteen times the first size from the outlet end 221. Exemplarily, the second size is set equal to ten times the first size for the experiment.

[0130] For some examples, see Figure 1-Figure 3 The experimental device 100 also includes a pressure scanning valve and a Pitot tube 70. The pressure scanning valve is arranged on the top plate of the simulation chamber 11. The Pitot tube 70 is connected to the pressure scanning valve. At least part of the Pitot tube 70 is located in the air duct 11a to obtain the wind speed in the air duct 11a. One end of the Pitot tube 70 located in the air duct 11a is located on the side of the outlet end 221 away from the air outlet 11c.

[0131] The wind speed in the air duct 11a can be measured by the pressure scanning valve and the pitot tube 70, which can be used to calculate the Richardson number. For example, the frequency of the pressure scanning valve is 50 Hz to meet the experimental requirements. The turbulence can be obtained by analyzing the wind speed in the time series, and the boundary layer thickness and friction speed can be obtained by analyzing the wind speed at different heights.

[0132] It is understandable that the boundary layer thickness measurement value obtained by the pressure scanning valve and the pitot tube 70 is not equivalent to the boundary layer thickness preset value mentioned above.

[0133] One end of the Pitot tube 70 located in the air duct 11 a is located on a side of the outlet end 221 away from the air outlet 11 c , which can improve the accuracy of the wind speed measurement value.

[0134] For example, see Figure 1-Figure 3One end of the Pitot tube 70 in the wind duct 11a is located on the side of the outlet end 221 away from the air outlet 11c, and one end of the Pitot tube 70 in the wind duct 11a is located on the side of the rainfall simulation device 90 away from the air outlet 11c. The accuracy of the wind speed measurement value can be improved.

[0135] In some embodiments, the experimental device 100 includes a first temperature sensor and a second temperature sensor. The first temperature sensor is used to obtain the temperature of the airflow at a preset height from the floor 31 in the air duct 11a as a first temperature; the second temperature sensor is used to obtain the temperature of the floor 31 as a second temperature.

[0136] The temperature difference of the airflow along the up-down direction Z in the air duct 11 a can be obtained by the first temperature sensor and the second temperature sensor. The first temperature and the second temperature can be used to calculate the Richardson number.

[0137] For some examples, see Figure 1-Figure 3 The experimental device 100 also includes an aerosol recovery device 80, which is disposed at the air outlet 11c and located in the air duct 11a and close to the air outlet 11c, and is used to collect aerosols flowing toward the air outlet 11c, thereby reducing the possibility of aerosols leaking out of the air duct 11a and affecting the environment and human body.

[0138] For some examples, see Figure 3 The aerosol recovery device 80 includes a spray module 81 and a collection module. The spray module 81 is disposed on the top plate of the simulation chamber 11 to provide liquid to settle the aerosol; the collection module is disposed on the floor 31 to collect the liquid mixed with the aerosol.

[0139] The spray module 81 provides liquid to settle the aerosol, which can contact the aerosol in a wide range, effectively capture aerosols of different particle sizes, and improve the recovery efficiency. The spray module 81 has a relatively simple structure, which is convenient for later maintenance and has a low maintenance cost.

[0140] It is understandable that, according to different aerosol components, the spray module 81 can select liquid of corresponding components for spraying according to different aerosol components to improve the recovery effect.

[0141] The present application also provides an experimental method for wind tunnel simulation of aerosol diffusion and precipitation, see Figure 5 , using any one of the experimental devices 100 of the embodiments of the present application to perform a simulation experiment, the experimental method includes:

[0142] S1: Providing aerosol into the air duct;

[0143] S2: Provide airflow to the air duct to diffuse the aerosol;

[0144] S3: Obtain the diffusion and sedimentation parameters of the aerosol.

[0145] The experimental method provided in the embodiment of the present application uses the above-mentioned experimental device 100 to conduct experiments, and has the same beneficial effects as the above-mentioned experimental device 100.

[0146] In some embodiments, the step of obtaining the diffusion and deposition parameters of the aerosol includes:

[0147] Select a preset position in the air duct, the distance between the preset position and the floor in the up and down direction is a preset height L1;

[0148] The temperature of the airflow at the preset position is obtained as the first temperature T hot ;

[0149] The temperature of the floor 31 is obtained as the second temperature T ref ;

[0150] Get the velocity v of the airflow;

[0151] The Richardson number is calculated, specifically, the Richardson number is calculated according to the following functional relationship:

[0152]

[0153] Where β is the thermal expansion coefficient of the airflow, and g is the acceleration due to gravity.

[0154] By adjusting at least one of the turbulence simulation device 40, the ground simulation device 30 and the rainfall simulation device 90, a plurality of sets of data are obtained for analysis, so that the Richardson number can be obtained. i When R is 0, it is considered that the atmospheric boundary layer has reached neutral conditions. i When R is less than 0, the stability of the atmospheric boundary layer is considered to be unstable. When studying the influence of at least one of the ground simulation device 30 and the rainfall simulation device 90 on the diffusion and precipitation parameters, the turbulence simulation device 40 can be adjusted to make R i =0, and the atmospheric boundary layer of neutral conditions is obtained. Then, data is obtained by adjusting at least one of the ground simulation device 30 and the rainfall simulation device 90 for analysis.

[0155] In some embodiments, the step of obtaining the diffusion and deposition parameters of the aerosol includes:

[0156] Obtaining a distance x between the aerosol at a preset position and the outlet end 221 of the aerosol generating device 20;

[0157] The standard deviation of the concentration distribution of the aerosol at the preset position in the air duct 11a is obtained as the spanwise diffusion parameter σ y ;

[0158] The spanwise diffusion coefficient a and the spanwise diffusion coefficient p are calculated, specifically, the spanwise diffusion coefficient a and the spanwise diffusion coefficient p are calculated according to the following functional relationship:

[0159] σ y =a*x p .

[0160] By adjusting at least one of the turbulence simulation device 40, the ground simulation device 30 and the rainfall simulation device 90, a plurality of sets of data are obtained for analysis, so that the spanwise diffusion coefficient a and the spanwise diffusion coefficient [ can be obtained.

[0161] In some embodiments, the step of obtaining the diffusion and deposition parameters of the aerosol includes:

[0162] Obtaining a distance s between the aerosol at a preset position and the outlet end 221 of the aerosol generating device 20;

[0163] The standard deviation of the aerosol concentration distribution in the air duct 11a at the preset position is obtained as the vertical diffusion parameter σ z ;

[0164] The vertical diffusion coefficient b and the vertical diffusion coefficient q are calculated, specifically, the vertical diffusion coefficient b and the vertical diffusion coefficient q are calculated according to the following functional relationship:

[0165] σ z =b*s q .

[0166] By adjusting at least one of the turbulence simulation device 40, the ground simulation device 30 and the rainfall simulation device 90, a plurality of sets of data are obtained for analysis, so that the vertical diffusion coefficient b and the vertical diffusion coefficient q can be obtained.

[0167] In some embodiments, the experimental method comprises:

[0168] The roughness element is driven to move along the up-down direction Z and / or the upper end of the wedge is driven to tilt toward the second direction Y at a preset angle to obtain diffusion sedimentation parameters under different conditions.

[0169] By adjusting the height of the roughness element relative to the ground simulation device 30 and the angle at which the upper end of the wedge is inclined toward the second direction Y, different turbulence structures can be obtained, thereby obtaining different boundary layer thicknesses, friction velocities, and turbulence intensities. The influence of the turbulence structure on the aerosol diffusion and deposition parameters is analyzed.

[0170] In some embodiments, the experimental method comprises:

[0171] The heating power of the heating device is adjusted and / or heating plates with different roughness are replaced to obtain diffusion sedimentation parameters under different conditions.

[0172] In this way, the atmospheric boundary layer under unstable conditions can be simulated and the aerosol diffusion and deposition parameters under unstable conditions can be analyzed and obtained.

[0173] The present application also provides an experimental method for wind tunnel simulation of aerosol diffusion and precipitation, see Figure 6 , using any one of the experimental devices 100 of the embodiments of the present application to perform a simulation experiment, the experimental method includes:

[0174] T1: supply droplets into the air duct to simulate rainfall;

[0175] T2: Providing aerosol into the air duct;

[0176] T3: Provide airflow to the air duct to diffuse the aerosol;

[0177] T4: Obtain the diffusion and deposition parameters of aerosol.

[0178] In this way, a wet deposition environment can be simulated.

[0179] In some embodiments, the experimental method comprises:

[0180] The rainfall amount per unit time of the rainfall simulation device 90 is adjusted to obtain the diffusion sedimentation parameters under different conditions.

[0181] It is understandable that in order to obtain the diffusion and deposition parameters of the aerosol when adjusting the rainfall simulation device 90, the turbulence simulation device 40, the ground simulation device 30, the wind tunnel simulation device 10 and the aerosol generating device 20 can be adjusted to be stable, and only the rainfall per unit time of the rainfall simulation device 90 can be adjusted to obtain the diffusion and deposition parameters under different conditions. It is also possible to adjust at least one of the turbulence simulation device 40, the ground simulation device 30, the wind tunnel simulation device 10 and the aerosol generating device 20 and the rainfall simulation device 90, which can be adaptively selected according to experimental requirements.

[0182] Taking a specific implementation as an example, some experimental steps of the experimental device 100 provided in the embodiment of the present application are described below:

[0183] The wedge module 41 and the rough element module 42 are placed in the air duct 11a;

[0184] Place one end of the Pitot tube 70 into the air duct 11a;

[0185] The ground simulation device 30 is installed on the bottom plate of the simulation room 11;

[0186] Activating the aerosol recovery device 80;

[0187] Turn on the fan to provide airflow into the air duct 11a;

[0188] The first wind speed is obtained by using the Pitot tube 70, and the boundary layer thickness, friction velocity, and turbulence are calculated;

[0189] driving the rough element to move along the up-down direction Z and / or driving the upper end of the wedge to tilt toward the second direction Y at a preset angle to obtain diffusion sedimentation parameters under different conditions;

[0190] Stop driving the roughening element and / or the wedge;

[0191] Select a preset position in the air duct, the distance between the preset position and the floor in the up and down direction is a preset height L1;

[0192] Setting the first temperature sensor at a preset position;

[0193] Install the second temperature sensor on the floor 31;

[0194] Heating the floor 31 by means of a heating device;

[0195] The second wind speed is obtained by using the pitot tube 70 and the Richardson number is calculated;

[0196] Installation of Doppler particle dynamic analyzer 60 and PIV measurement system;

[0197] The aerosol is released in the air duct 11a by the aerosol generating device 20;

[0198] The motion parameters of aerosols were recorded and analyzed by Doppler particle dynamic analyzer 60 and PIV measurement system, and the spanwise diffusion coefficient, vertical diffusion coefficient and terminal settling velocity of aerosols were calculated to obtain experimental data under dry deposition conditions.

[0199] The data from the Doppler particle dynamic analyzer 60 and the PIV measurement system were compared;

[0200] The rainfall simulation device 90 is started to adjust the rainfall per unit time according to the experimental requirements;

[0201] Repeat the above steps to obtain experimental data under wet deposition conditions.

[0202] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An experimental device for wind tunnel simulation of aerosol diffusion and sedimentation, characterized in that: include: A wind tunnel simulation device, comprising a fan and a simulation chamber, wherein the simulation chamber has a wind channel extending along a first direction and an air inlet and an air outlet located at two ends of the wind channel, and the fan is used to provide airflow to the air inlet; an aerosol generating device having an outlet end for providing aerosol into the air duct; A ground simulation device, comprising a floor and a heating device, wherein the floor is arranged on the bottom plate of the simulation room and is located in the air duct, and the heating device is used to provide heat to the floor so that the air duct has a temperature difference in the up-down direction; A turbulence simulation device, used for simulating the turbulence structure of an atmospheric boundary layer, the turbulence simulation device comprising a wedge module and a rough element module, the wedge module being arranged in the air duct and close to the air inlet, the wedge module comprising a plurality of wedges arranged along a second direction, the rough element module being arranged in the air duct and located on the inner side of the wedge module, the rough element module comprising a plurality of rough elements arranged along the first direction and the second direction, the first direction, the second direction and the up-down direction being perpendicular to each other; The measuring system is used to obtain the diffusion and deposition parameters of the aerosol in the air duct.

2. The experimental device according to claim 1, characterized in that: The experimental device also includes: A first driving member is provided on at least one of the turbulence simulation device and the simulation chamber, and is used to drive the upper end of the wedge to tilt toward the second direction at a preset angle; and / or, The second driving member is disposed on at least one of the turbulence simulation device and the simulation chamber, and is used to drive the roughness element to move in an up-down direction.

3. The experimental device according to claim 1, characterized in that: The rough element module is arranged adjacent to the wedge module.

4. The experimental device according to claim 1, characterized in that: The aerosol generating device comprises: an aerosol generating module, disposed on the simulation chamber, for generating aerosol; an aerosol release tube, comprising a tube body and the outlet end connected to each other, wherein the outlet end is connected to the aerosol generating module through the tube body to release the aerosol into the air duct; The third driving member is used to drive the outlet end to move in the up-down direction.

5. The experimental device according to claim 4, characterized in that: The cross-sectional diameter of the outlet end is larger than the cross-sectional diameter of the tube body.

6. The experimental device according to claim 1, characterized in that: The measurement system comprises: A recording module, used for recording the motion parameters of the aerosol in the air duct located downwind of the outlet end; An analysis module is used to analyze the motion parameters to obtain the diffusion sedimentation parameters.

7. The experimental device according to claim 1, characterized in that: The diffusion sedimentation parameters include vertical diffusion parameter, spanwise diffusion parameter, terminal sedimentation velocity, Richardson number and particle size.

8. The experimental device according to claim 6, characterized in that: The recording module comprises: A first recording unit, used for recording aerosols within a first preset range from the outlet end, wherein the first recording unit is disposed on at least one side of the ground simulation device along the first direction to obtain movement parameters of the aerosols along the up and down directions; The second recording unit is used to record the aerosol within a second preset range from the outlet end, and the second recording unit is arranged on the top plate of the simulation chamber to obtain the movement parameters of the aerosol along the second direction.

9. The experimental device according to claim 8, characterized in that: The first recording unit includes a plurality of cameras, and the plurality of cameras are arranged at intervals along a first direction; the second recording unit includes a plurality of cameras, and the plurality of cameras are arranged at intervals along the first direction.

10. The experimental device according to claim 9, characterized in that: The height of the outlet end from the floor in the up-down direction is a first dimension, a spatial range of a second dimension extending from the outlet end in the up-down direction is the first preset range, and a spatial range of a second dimension extending from the outlet end in the second direction is the second preset range; Wherein, the first size does not exceed a preset value of the boundary layer thickness; and / or, the second size is not less than five times the first size.

11. The experimental device according to claim 1, characterized in that: The experimental device also includes: The Doppler particle dynamic analyzer is arranged on at least one side of the ground simulation device along the first direction, and is used for preliminarily obtaining the motion parameters and particle size of the aerosol.

12. The experimental device according to claim 1, characterized in that: The experimental device also includes: A pressure scanning valve and a Pitot tube, wherein the pressure scanning valve is arranged on the top plate of the simulation chamber; the Pitot tube is connected to the pressure scanning valve, and at least part of the Pitot tube is located in the air duct to obtain the wind speed in the air duct; one end of the Pitot tube located in the air duct is located on the side of the outlet end away from the air outlet.

13. The experimental device according to claim 1, characterized in that: The experimental device includes: a first temperature sensor, used to obtain the temperature of the airflow in the air duct at a preset height from the floor as a first temperature; The second temperature sensor is used to obtain the temperature of the floor as a second temperature.

14. The experimental device according to any one of claims 1 to 13, characterized in that: The experimental device also includes: The aerosol recovery device is arranged in the air duct and close to the air outlet, and is used for collecting the aerosol flowing toward the air outlet.

15. The experimental device according to claim 14, characterized in that: The aerosol recovery device comprises: A spray module, disposed on the top plate of the simulation chamber, for providing liquid to settle the aerosol; The collecting module is arranged on the floor and is used for collecting the liquid mixed with the aerosol.

16. The experimental device according to claim 1, characterized in that: The experimental device also includes: The rainfall simulation device comprises a rainfall simulation module and a rainfall sensor. The rainfall simulation module is arranged on the top plate of the simulation room and is used to provide droplets into the air duct to simulate rainfall. The rainfall sensor is arranged on the floor and is used to obtain rainfall parameters.

17. The experimental device according to claim 16, characterized in that: The rainfall simulation device also includes: The controller is electrically connected to the rainfall simulation module and the rainfall sensor respectively, and is used for adjusting the rainfall of the rainfall simulation module according to the rainfall parameter.

18. An experimental method for wind tunnel simulation of aerosol diffusion and settling, characterized in that: An experiment is conducted using the experimental device according to any one of claims 1 to 15, wherein the experimental method comprises: providing an aerosol into the air duct; providing airflow to the air duct to diffuse the aerosol; Obtain the diffusion and deposition parameters of aerosols.

19. The experimental method according to claim 18, characterized in that: The steps to obtain the diffusion and deposition parameters of aerosols include: A preset position is selected in the air duct, wherein the distance between the preset position and the floor in the up-down direction is a preset height L1; The temperature of the airflow at the preset position is obtained as a first temperature T hot ; The temperature of the floor is obtained as a second temperature T ref ; Obtaining the flow velocity v of the airflow; The Richardson number is calculated, specifically, the Richardson number is calculated according to the following functional relationship: Where β is the thermal expansion coefficient of the airflow, and g is the acceleration due to gravity.

20. The experimental method according to claim 18, characterized in that: The steps to obtain the diffusion and deposition parameters of aerosols include: Obtaining a distance x between the aerosol at a preset position and the outlet end of the aerosol generating device; The standard deviation of the concentration distribution of the aerosol at the preset position along the second direction in the air duct is obtained as the spanwise diffusion parameter σ y ; The spanwise diffusion coefficient a and the spanwise diffusion coefficient p are calculated, specifically, the spanwise diffusion coefficient a and the spanwise diffusion coefficient p are calculated according to the following functional relationship: s y =a*x p 。 21. The experimental method according to claim 18, characterized in that: The steps to obtain the diffusion and deposition parameters of aerosols include: Obtaining a distance s between the aerosol at a preset position and the outlet end of the aerosol generating device; The standard deviation of the aerosol concentration distribution in the vertical direction of the air duct at the preset position is obtained as the vertical diffusion parameter σ z ; The vertical diffusion coefficient b and the vertical diffusion coefficient q are calculated, specifically, the vertical diffusion coefficient b and the vertical diffusion coefficient q are calculated according to the following functional relationship: s z =b*s q 。 22. The experimental method according to claim 18, characterized in that: The experimental method includes: The rough element is driven to move in the up-down direction and / or the upper end of the wedge is driven to tilt toward the second direction at a preset angle, so as to obtain the diffusion sedimentation parameters under different conditions.

23. The experimental method according to claim 18, characterized in that: The experimental method includes: The heating power of the heating device is adjusted and / or the floor with different roughness is replaced to obtain the diffusion sedimentation parameters under different conditions.

24. An experimental method for wind tunnel simulation of aerosol diffusion and deposition, characterized in that: An experiment is conducted using the experimental device according to claim 16 or 17, wherein the experimental method comprises: providing liquid droplets into the air duct to simulate rainfall; providing an aerosol into the air duct; providing airflow to the air duct to diffuse the aerosol; Obtain the diffusion and deposition parameters of aerosols.

25. The experimental method according to claim 24, characterized in that: The experimental method includes: The rainfall per unit time of the rainfall simulation device is adjusted to obtain the diffusion sedimentation parameters under different conditions.

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