Columnar water tank experiment system for simulating earth turning deflection force and flow field measurement method thereof

Abstract

The invention relates to a columnar water tank experiment system for simulating earth rotation deflection force and a flow field measurement method thereof, and belongs to the technical field of water tank experiments and flow field measurement thereof. The experiment system comprises a deflection supporting system, a temperature adjusting system, a water tank experiment system and a measurement system; the output end of a deflection motor in the deflection supporting system is connected with a rotating disc, and the water tank experiment system synchronously rotates along with the rotating disc under the driving of the deflection motor; the temperature adjusting system is arranged on the rotating disc and comprises a plurality of semiconductor chilling plates, the plurality of semiconductor chilling plates are arranged at intervals, and each semiconductor chilling plate is independently controlled; and the water tank experiment system is arranged close to the plurality of semiconductor chilling plates. According to the invention, a linear thermal inversion layer is formed through the semiconductor chilling plate to simulate the heat island effect, and the influence of earth rotation deflection force on urban weather and the heat island effect is simulated through rotation, so that the simulation precision of temperature and airflow distribution in a city is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water flume experiments and flow field measurements thereof, and in particular relates to a columnar water flume experiment system simulating the Coriolis force and a flow field measurement method thereof. Background Art

[0002] Flume experiments and their flow field measurement technology have wide applications in urban planning and climate research. By predicting the temperature and airflow distribution within a city, urban planning researchers can determine the appropriate building height, spacing, and layout to improve urban ventilation and reduce the urban heat island effect.

[0003] The Coriolis force is a component of the Coriolis force in the direction of the earth's surface. Due to the rotation of the earth, the movement of particles on the earth's surface will be affected by the Coriolis force, causing the direction of movement to shift. The Coriolis force will not change the speed of the moving object, but it will change its direction. This force has an important impact on natural circulation phenomena such as urban heat island circulation, monsoon circulation, air mass movement, and the direction of movement of ocean currents and rivers.

[0004] Circulation patterns also have an important impact on global and local climate and weather. At the city scale, they indirectly affect urban heat island circulation by affecting the direction of atmospheric flow. For example, in the northern hemisphere, due to the influence of the Coriolis force, airflow will deflect to the right when moving from north to south, forming a clockwise rotating vortex. This deflection may destroy the original ventilation system of the city, resulting in poor air circulation, causing heat to accumulate in the city center, and thus exacerbating the urban heat island effect.

[0005] At present, only WRF, MM5 and RCMs consider the impact of the Coriolis force on urban meteorology and urban heat island circulation. As one of the most widely used urban mesoscale simulation methods, the flume experiment ignores the impact of the Coriolis force, which greatly reduces the simulation accuracy of urban meteorology and urban heat island circulation inside the city, thus affecting urban planning decisions, worsening urban ventilation and exacerbating the urban heat island effect. Therefore, there is an urgent need for a columnar flume experiment system that can simulate the Coriolis force and its flow field measurement method. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a columnar water tank experimental system for simulating the Coriolis force and a flow field measurement method thereof. The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0007] The present invention provides a columnar water tank experimental system for simulating the Coriolis force, comprising: a deflection support system 100, a temperature control system 200, a water tank experimental system 300 and a measurement system 400; the deflection support system 100 comprises: a deflection motor 110 and a rotating disk 130, the output end of the deflection motor 110 is connected to the rotating disk 130; wherein, driven by the deflection motor 110, the water tank experimental system 300 rotates synchronously with the rotating disk 130; the temperature control system 200 is arranged on the rotating disk 130, and the temperature control system 200 comprises: a semiconductor cooling plate 210, wherein a plurality of the semiconductor cooling plates 210 are arranged at intervals, and each of the semiconductor cooling plates 210 is independently controlled; the water tank experimental system 300 is arranged close to the plurality of the semiconductor cooling plates 210, and a linear temperature inversion layer is formed in the water tank experimental system 300 by the semiconductor cooling plates 210.

[0008] 2. According to the columnar water tank experimental system for simulating the Coriolis deflection force described in claim 1, the deflection support system 100 also includes: a transmission shaft 120 and a first oblique support rod 140; the transmission shaft 120 is coaxially connected to the output end of the deflection motor 110 and the rotating disc 130 respectively; a plurality of first oblique support rods 140 are arranged, and the plurality of first oblique support rods 140 are arranged at intervals, and the two ends of each first oblique support rod 140 are respectively connected to the transmission shaft 120 and the rotating disc 130.

[0009] In one embodiment of the present invention, at least one of the semiconductor refrigeration chips 210 is located in the middle, and all other semiconductor refrigeration chips 210 are arranged around the semiconductor refrigeration chip 210 in the middle.

[0010] In one embodiment of the present invention, each of the semiconductor cooling fins 210 is square or circular, and a heat insulating layer is disposed outside each of the semiconductor cooling fins 210 .

[0011] In one embodiment of the present invention, the temperature control system 200 also includes: a flexible heat dissipation layer 220 and a heat dissipation plate 230; a plurality of the semiconductor refrigeration sheets 210 are embedded in the flexible heat dissipation layer 220; the heat dissipation plate 230 is located between the water tank experiment system 300 and the semiconductor refrigeration sheet 210, the heat dissipation plate 230 is arranged one-to-one with the semiconductor refrigeration sheet 210, and an insulation layer is arranged outside each of the heat dissipation plates 230.

[0012] In one embodiment of the present invention, the water tank experiment system 300 includes: a columnar water tank 310, wherein the columnar water tank 310 is filled with a saline solution; an insulating cover plate 311 is provided on the columnar water tank 310, and a through hole is opened in the middle of the insulating cover plate 311, and a light source or an insulating rubber plug is arranged in the through hole.

[0013] In one embodiment of the present invention, the measuring system 400 includes: a camera 410 and an adjusting bracket 420; a plurality of the cameras 410 and the adjusting bracket 420 are provided, and the plurality of adjusting brackets 420 are provided around the columnar water tank 310, and each of the cameras 410 is provided on a corresponding adjusting bracket 420, and the vertical position or horizontal position of the corresponding camera 410 is adjusted by the adjusting bracket 420.

[0014] In one embodiment of the present invention, a columnar water tank experimental system for simulating the Coriolis force also includes: a support base 500 for supporting the deflection support system 100; the support base 500 includes: a support column 510, a horizontal support rod 520, a second oblique support rod 530, a first bearing 540 and a second bearing 550; wherein, the support column 510, the horizontal support rod 520 and the second oblique support rod 530 are each provided with a plurality of support columns 510, the horizontal support rod 520 and the second oblique support rod 530 are respectively connected one by one; the first bearing 540 is respectively connected to a plurality of the horizontal support rods 520, the second bearing 550 is respectively connected to a plurality of the second oblique support rods 530, the deflection motor 110 is fixedly connected to a plurality of the horizontal support rods 520, and the transmission shaft 120 is respectively coaxially connected to the first bearing 540 and the second bearing 550.

[0015] The present invention also provides a flow field measurement method for a columnar water tank experimental system simulating the Coriolis force, which is used for the columnar water tank experimental system simulating the Coriolis force, and the method comprises:

[0016] injecting saline solution into the columnar water tank, and sealing the columnar water tank after the injection is completed;

[0017] Setting a plurality of semiconductor refrigeration sheets to a refrigeration mode until the salt water solution in the columnar water tank forms a stable linear inversion layer;

[0018] Setting the installation angles of a plurality of cameras, and starting the deflection motor after setting the angular frequency of the deflection motor to simulate the Coriolis force;

[0019] Then, several semiconductor cooling sheets are set to heating mode, and light sources are set;

[0020] Start several cameras to measure the flow field of a cylindrical water tank experimental system simulating the Coriolis force, and obtain several groups of cylindrical flow field measurement images;

[0021] Cylindrical back-projection correction is performed on several groups of cylindrical flow field measurement images respectively, and the corrected several groups of cylindrical flow field measurement images are spliced ​​in sequence to obtain panoramic cylindrical flow field measurement images based on multi-camera shooting.

[0022] In one embodiment of the present invention, the angular frequency of the deflection motor is set to simulate the influence of the Coriolis force in different latitudes on urban meteorology and urban heat island effect.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The columnar water tank experimental system for simulating the Coriolis force of the present invention arranges the temperature control system and the water tank experimental system on the deflection support system, forms a linear inversion layer through semiconductor refrigeration plates to simulate the heat island effect; at the same time, the water tank experimental system is driven by the deflection motor to rotate synchronously, and the influence of the Coriolis force on the urban meteorology and the heat island effect is simulated by rotation, thereby greatly improving the simulation accuracy of the temperature and airflow distribution inside the city.

[0025] The flow field measurement method of the columnar water tank experimental system simulating the Coriolis force of the present invention is very convenient to operate. After a stable linear inversion layer is formed in the upper columnar water tank, the deflection motor at the lower part is started synchronously, so that the upper deflection support system and the temperature control system rotate synchronously together, thereby realizing the visualization of urban meteorology and heat island effect under the influence of the Coriolis force.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of a columnar water tank experimental system for simulating the Coriolis force provided by an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of a deflection support system and a support base provided in an embodiment of the present invention;

[0029] Figure 3 is a schematic diagram of the principle of a columnar water tank experimental system for simulating the Coriolis force provided by an embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of a water tank experiment system provided by an embodiment of the present invention;

[0031] Figure 5 is a schematic structural diagram of a temperature control system provided by an embodiment of the present invention;

[0032] Figure 6 It is a flow chart of a flow field measurement method of a columnar water tank experimental system simulating the Coriolis force provided by an embodiment of the present invention;

[0033] Figure 7 Schematic diagram of the principle of the cylindrical flow field back-projection correction algorithm provided by an embodiment of the present invention;

[0034] Figure 8 It is a schematic diagram of the principle of stitching partial images of a cylindrical flow field into a panoramic image provided by an embodiment of the present invention.

[0035] Icons: 100-deflection support system; 110-deflection motor; 120-drive shaft; 130-rotating disc; 140-first oblique support rod; 200-temperature control system; 210-semiconductor refrigeration plate; 211-middle refrigeration plate; 212-edge refrigeration plate; 220-flexible heat dissipation layer; 230-heat dissipation plate; 300-water tank experimental system; 310-columnar water tank; 311-insulating cover; 400-measurement system; 410-camera; 420-adjustment bracket; 500-support base; 510-support column; 520-horizontal support rod; 530-second oblique support rod; 540-first bearing; 550-second bearing. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of a columnar water tank experimental system for simulating the Coriolis force and a flow field measurement method thereof proposed in accordance with the present invention in combination with the accompanying drawings and specific implementation methods.

[0037] The above and other technical contents, features and effects of the present invention are clearly presented in the following detailed description of the specific implementation modes in conjunction with the accompanying drawings. Through the description of the specific implementation modes, the technical means and effects adopted by the present invention to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation purposes and are not used to limit the technical solutions of the present invention.

[0038] Embodiment 1

[0039] like Figure 1 and Figure 2 As shown, Figure 1 Schematic diagram of the structure of a columnar water tank experimental system for simulating the Coriolis force provided by an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a deflection support system and a support base provided in an embodiment of the present invention.

[0040] In this embodiment, a columnar water tank experimental system for simulating the Coriolis force includes: a deflection support system 100, a temperature control system 200, a water tank experimental system 300 and a measurement system 400; the deflection support system 100 includes: a deflection motor 110 and a rotating disk 130, and the output end of the deflection motor 110 is connected to the rotating disk 130; the temperature control system 200 is arranged on the rotating disk 130, and the temperature control system 200 includes: semiconductor cooling plates 210, there are a plurality of semiconductor cooling plates 210, and the plurality of semiconductor cooling plates 210 are arranged at intervals, and each semiconductor cooling plate 210 is independently controlled; the water tank experimental system 300 is arranged close to the plurality of semiconductor cooling plates 210, and a linear inversion layer is formed in the water tank experimental system 300 through the semiconductor cooling plates 210.

[0041] like Figure 3 As shown, Figure 3 It is a schematic diagram of the principle of a columnar water tank experimental system for simulating the Coriolis force provided by an embodiment of the present invention.

[0042] The Coriolis force is a component of the Coriolis force in the direction of the earth's surface. That is, for low-latitude areas (equator to Tropic of Cancer), it operates in a low angular frequency state, at which time the Rossby number is large, the Coriolis frequency is low, and the influence of the Coriolis force is weak; for mid-latitude areas (Tropic of Cancer to Arctic Circle), it operates in a medium angular frequency state, at which time the Rossby number is medium, the Coriolis frequency is medium, and the influence of the Coriolis force is medium; for high-latitude areas (Arctic Circle), it operates in a high angular frequency state, at which time the Rossby number is small, the Coriolis frequency is high, and the influence of the Coriolis force is strong. Therefore, driven by the deflection motor 110, the temperature control system 200 and the water tank experimental system 300 rotate synchronously with the rotating disk 130, and simulate the influence of the Coriolis force by rotating.

[0043] Exemplarily, the deflection motor 110 can be set as a variable frequency brushless motor, and its angular frequency can be changed by stepless speed regulation, and the influence of the Coriolis force in different latitudes on urban meteorology and heat island effect can be simulated by changing the angular frequency; that is, the experimental conditions inside the water tank experimental system 300 are kept unchanged, and the influence of the Coriolis force in different latitudes can be simulated by adjusting the angular frequency of the variable frequency brushless motor.

[0044] It is worth noting that by setting the angular frequency of the deflection motor 110, the influence of the Coriolis force in different latitudes on urban meteorology and urban heat island effect can be simulated, so that the formed simulation experimental system is closer to the actual prototype city and the measurement results of its flow field are more accurate.

[0045] Exemplarily, the rotating disk 130 may be configured as a circular ring structure, in which a plurality of horizontal connecting rods are disposed, and the plurality of horizontal connecting rods are equally connected to the inner circumference of the circular ring structure.

[0046] In an optional embodiment, the deflection support system 100 also includes: a transmission shaft 120 and a first oblique support rod 140; the transmission shaft 120 is coaxially connected to the output end of the deflection motor 110 and the rotating disc 130 respectively; a plurality of first oblique support rods 140 are provided, and the plurality of first oblique support rods 140 are arranged at intervals, and the two ends of each first oblique support rod 140 are respectively connected to the transmission shaft 120 and the rotating disc 130.

[0047] Exemplarily, four first oblique support rods 140 are provided, the first ends of the four first oblique support rods 140 are welded to the transmission shaft 120 , and the second ends of the four first oblique support rods 140 are connected to the outer circumferential bottom of the rotating disk 130 in four equal parts.

[0048] like Figure 4 and Figure 5 As shown, Figure 4 is a schematic structural diagram of a water tank experiment system provided by an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a temperature control system provided in an embodiment of the present invention.

[0049] In this embodiment, the semiconductor cooling sheet 210 is a heat pump, which utilizes the Peltier effect of semiconductor materials. When direct current passes through, its upper and lower surfaces absorb heat and release heat respectively, realizing cooling of the upper surface and heating of the lower surface. The switching of cooling and heating modes can be realized by switching the current direction. For example, in cooling mode, the upper surface of the semiconductor cooling sheet 210 is the cold end, and the lower surface is the hot end; in heating mode, the upper surface of the semiconductor cooling sheet 210 is the hot end, and the lower surface is the cold end. At least one semiconductor cooling sheet 210 is arranged in the middle, and all other semiconductor cooling sheets 210 are arranged around the semiconductor cooling sheet 210 in the middle. By independently controlling all semiconductor cooling sheets 210, such as cooling the middle cooling sheet 211 and the edge cooling sheet 212 at the same time, a temperature difference is generated in the columnar water tank 310, that is, the solution on the side close to the semiconductor cooling sheet 210 and the solution on the side away from the semiconductor cooling sheet 210 in the columnar water tank 310.

[0050] After a long period of convective heat transfer, a linear inversion layer, that is, linear temperature stratification, can be formed. After a stable linear temperature stratification is formed, it is converted into a heating mode to simulate the urban heat island circulation.

[0051] It can be understood that independent control means that the middle refrigeration fin 211 and the edge refrigeration fin 212 can heat or cool at the same time, or the middle refrigeration fin 211 heats and the edge refrigeration fin 212 cools, or the middle refrigeration fin 211 cools and the edge refrigeration fin 212 heats.

[0052] It is worth noting that the semiconductor cooling plate 210 has a compact structure and, since no moving parts are provided, can be used in some occasions with limited space, high reliability requirements, and no refrigerant pollution.

[0053] Exemplarily, each semiconductor cooling chip 210 may be configured to be square or circular, and a heat insulating layer is disposed outside each semiconductor cooling chip 210 .

[0054] In an optional embodiment, the temperature control system 200 further includes: a flexible heat dissipation layer 220 ; a plurality of semiconductor cooling sheets 210 are respectively embedded in the flexible heat dissipation layer 220 , and the flexible heat dissipation layer 220 is arranged between the water tank experiment system 300 and the rotating disk 130 .

[0055] Exemplarily, the flexible heat dissipation layer 220 is a non-smooth surface structure made of flexible soft material (such as polyester fiber or resin) with a certain thickness. Its flexible and soft characteristics enable them to adapt to various shapes and installation requirements. Its non-smooth characteristics help to increase the friction between the upper surface of the lower deflection support system 100 and the lower surface of the upper water tank test system 300 to prevent sliding or falling off. Its heat dissipation characteristics are to dissipate the heat of the water tank test system 300 in time to make the system more stable and efficient.

[0056] In an optional embodiment, the temperature control system 200 also includes: a heat sink 230; the heat sink 230 is located between the water tank experiment system 300 and the semiconductor refrigeration sheet 210, the heat sink 230 is arranged one-to-one with the semiconductor refrigeration sheet 210, and an insulation layer is arranged outside each heat sink 230.

[0057] For example, if the middle cooling fin 211 and the edge cooling fin 212 are both circular, the heat sink 230 is also set to be circular, one of the heat sinks 230 is set in the middle, and all the other heat sinks 230 are evenly arranged and correspond one by one to the edge cooling fins 212 respectively. If four edge cooling fins 212 are provided, and the four edge cooling fins 212 are evenly distributed at equal angles in a cross shape, the corresponding heat sinks 230 are also distributed in a cross shape.

[0058] Furthermore, the heat sink 230 is made of copper material. Since copper has a large thermal conductivity, the cold or heat of the middle cooling fin 211 and the edge cooling fin 212 can be evenly and effectively transferred to the salt water solution in the columnar water tank 310 .

[0059] It is worth noting that the heat sink 230 can evenly and effectively transfer the cold or heat of the middle cooling fin 211 and the edge cooling fin 212 to the saline solution in the columnar water tank 310, and the heat transfer between the heat sinks 230 can be effectively blocked by the insulation layer.

[0060] In an optional embodiment, an air-cooled or water-cooled radiator may be provided below the columnar water tank 310 to accelerate heat dissipation at the hot end, thereby improving its working efficiency.

[0061] Furthermore, if an air-cooled radiator is provided, the number of the air-cooled radiator and the semiconductor cooling plate 210 is equal and the positions are corresponding. By actively dissipating heat through the fan to reduce the hot end temperature, the corresponding cold end temperature will also decrease accordingly, thereby reaching a lower temperature.

[0062] like Figure 4 As shown, in this embodiment, the water tank experiment system 300 includes: a columnar water tank 310, the columnar water tank 310 is filled with a saline solution; an insulating cover plate 311 is provided on the columnar water tank 310, a through hole is opened in the middle of the insulating cover plate 311, and a light source or an insulating rubber plug is arranged in the through hole.

[0063] Exemplarily, the columnar water tank 310 is cylindrical and can be made of organic glass. The organic glass and the heat sink 230 are bonded by JL-6201 glass-to-metal glue. The organic glass has good transparency, which is conducive to observing the flow inside the water tank.

[0064] Specifically, taking the cylindrical acrylic glass water tank columnar water tank 310 as an example, acrylic glass with a wall thickness of C, an inner diameter of 2R, an outer diameter of 2 (R + C), and a height of H is used as the side wall, and a circular acrylic glass plate with a radius of (R + C) and a semiconductor cooling plate 210 with a radius of r are used as the bottom surface. At the same time, the heat-insulating cover plate 311 can also be made of acrylic glass material, which has the characteristics of heat insulation and opacity. The heat-insulating cover plate 311 is placed directly above the columnar water tank 310 and is snap-connected with the outer wall of the columnar water tank 310. The radius of the heat-insulating cover plate 311 is set to (R + 4C), and the radius of the heat-insulating cover plate 311 is set to be slightly larger than the radius (R + C) of the columnar water tank 310, so as to facilitate the installation of the snap-on device.

[0065] It is worth noting that when creating a linear inversion layer, a linear temperature stratification is generated between the semiconductor refrigeration plate 210 and the saline solution on the side close to the semiconductor refrigeration plate 210 in the columnar water tank 310 and the saline solution on the side close to the insulating cover 311. The insulating cover 311 can prevent the saline solution from exchanging heat with the outside and reduce water evaporation.

[0066] Since the horizontal range of urban heat island circulation can usually reach 2 to 4 times the diameter of the city, the total area of ​​the semiconductor cooling plate 210 should reach 5% to 20% of the total bottom area of ​​the columnar water tank 310, that is, 0.1R≤r≤0.2R. In principle, the larger the value of R, the better. However, taking into account the weight of the columnar water tank 310, the door frame size of the experimental site and the conventional commercial specifications of the semiconductor cooling plate 210, the bottom radius R of the columnar water tank 310 can be preferably set to 0.5m.

[0067] Furthermore, a through hole is provided in the middle of the heat-insulating cover plate 311 for installing a cross-sheet light source, which can emit a cross-shaped light beam, which is two mutually perpendicular light planes, and provides a light source for the columnar water tank experimental system simulating the Coriolis force and its flow field measurement. The principle is: the polarization ratio and linear polarization are adjusted by the instrument to scatter the light source at a certain angle to form a larger cross-shaped scattered light beam, and the cross-sheet light source is perpendicular to the bottom surface of the columnar water tank 310 and parallel to the shooting direction sheet of the camera 410, so as to realize the visualization of the heat island effect.

[0068] In addition, when non-contact measuring equipment such as PIV (particle image velocimetry) is used, there is no need to use a light source. In this case, after injecting a saline solution into the columnar water tank 310 through the through hole, an insulating rubber plug can be used to block the through hole to prevent dust from falling in.

[0069] It is worth noting that compared with pure water, using saline solution as the experimental medium has a lower freezing point and a higher boiling point, which can provide a wider temperature range, thus creating a larger gradient and more stable linear inversion layer, and the urban heat island circulation formed is closer to reality. In addition, an appropriate amount of aluminum powder can be added to the saline solution to make the visualization of the urban heat island circulation better.

[0070] In this embodiment, the measuring system 400 includes: a camera 410 and an adjusting bracket 420; a plurality of cameras 410 and adjusting brackets 420 are provided, and the plurality of adjusting brackets 420 are arranged around the columnar water tank 310, and each camera 410 is respectively arranged on a corresponding adjusting bracket 420, and the vertical position or horizontal position of the corresponding camera 410 is adjusted by the adjusting bracket 420.

[0071] Exemplarily, the camera 410 is fixed on the adjustment bracket 420 by bolts. The adjustment bracket 420 can be extended and retracted in the horizontal and vertical directions. A plurality of adjustment brackets 420 are respectively disposed above the outer side of the rotating disk 130 .

[0072] Exemplarily, the adjustment bracket 420 can be a T-shaped two-dimensional telescopic bracket, which is composed of a horizontal telescopic rod and a vertical telescopic rod. One end of the horizontal telescopic rod is connected to the rotating disk 130 by bolts, and one end of the vertical telescopic rod is connected to the camera 410 by bolts, that is, several adjustment brackets 420 and the camera 410 rotate synchronously with the rotating disk 130.

[0073] In this embodiment, the deflection support system 100 is arranged on a support base 500; the support base 500 includes: a support column 510, a horizontal support rod 520, a second oblique support rod 530, a first bearing 540 and a second bearing 550; wherein, the support column 510, the horizontal support rod 520 and the second oblique support rod 530 are each provided with a plurality of support columns 510, the horizontal support rod 520 and the second oblique support rod 530, and the support columns 510, the horizontal support rod 520 and the second oblique support rod 530 are respectively connected one by one; the first bearing 540 is respectively connected to a plurality of horizontal support rods 520, the second bearing 550 is respectively connected to a plurality of second oblique support rods 530, the deflection motor 110 is fixedly connected to a plurality of horizontal support rods 520, and the transmission shaft 120 is respectively coaxially connected to the first bearing 540 and the second bearing 550.

[0074] Exemplarily, four support columns 510, horizontal support rods 520 and second oblique support rods 530 are each provided, and the support columns 510, horizontal support rods 520 and second oblique support rods 530 are all distributed in a cross shape, wherein both ends of the second oblique support rods 530 are respectively connected to the outer periphery of the horizontal support rods 520 and the second bearing 550 by welding, the deflection motor 110 is connected below the central connection point of several horizontal support rods 520 by fixing bolts, and a rubber gasket is also provided between the deflection motor 110 and the central connection point of several horizontal support rods 520, and the output shaft of the deflection motor 110 is connected to the transmission shaft 120, and the transmission shaft 120 is coaxially connected to the first bearing 540 and the second bearing 550, respectively.

[0075] Exemplarily, the deflection motor 110 serves as a power source for the entire experimental system, and the transmission shaft 120 is coaxially connected to the first bearing 540 and the second bearing 550, respectively, and can be assembled by an interference fit assembly method such as press-fit assembly, low-temperature cold assembly or heating assembly.

[0076] In addition, a frame structure can be connected to the outside of the support base 500, and the frame structure includes a platform and angle steels. The platform is square, the rotating disc 130 is embedded in the platform, and the outer periphery of the rotating disc 130 is in active contact with the platform; four angle steels are arranged at the four corners of the support base 500 and extend upward along the support column 510.

[0077] It should be noted that the columnar water tank experimental system for simulating the Coriolis force of this embodiment is a model experimental system, and its theoretical basis is: the fluid particle kinematics (position, velocity, acceleration and rotation) caused by the fluid particle dynamics (pressure, gravity, viscous force, etc.) has a one-to-one correspondence in space and time. When scaled according to the characteristic scales of fluid properties, force, length and time, the two systems of different geometric scales are similar. In other words, the model experiment can obtain results close to the actual ones.

[0078] From the point of view of physics, the equation of motion reflects the dynamic relationship of the atmospheric boundary layer, but the atmospheric boundary layer flow cannot be described only by the equation of motion. Because the state parameters of the air will also change during the motion process, the continuity equation, thermodynamic equation and state equation must be supplemented. In the simulation experiment of this embodiment, only the dry air factor is considered, and there is no need to add the water vapor equation. Assuming that the air is an incompressible ideal gas, the state equation can also be omitted. The flow in the atmospheric boundary layer is mainly turbulent. It is a shallow fluid with a speed much lower than the speed of sound. In this case, the atmospheric boundary layer can be applied with the Boussinesq approximation (Boussinesq Approximation). In this way, the basic equations of the atmospheric boundary layer can be simplified to obtain the control equations, including: continuity equation, motion equation and thermodynamic equation. At the same time, a three-dimensional orthogonal rectangular coordinate system is established, with the west to east direction as the positive direction of the x-axis, the north to south direction as the positive direction of the y-axis, and the height direction as the z-axis direction. Then x, y, and z represent the vector values ​​of a point in the fluid in the three-dimensional orthogonal rectangular coordinate system, respectively. Correspondingly, i, j, and k represent the coordinate values ​​of the point on the x-axis, y-axis, and z-axis, respectively, which are scalars.

[0079] The continuity equation is expressed as:

[0080]

[0081] in, is the partial derivative function; i and j are respectively; u i is the velocity of the point with coordinate i in the fluid in the x-axis direction.

[0082] The equation of motion is expressed as:

[0083]

[0084] The left equation in formula (2) is the sum of the fluid unsteady acceleration and the convection acceleration, and the right equation is the sum of the pressure gradient force, molecular viscosity force, Coriolis force and buoyancy force; where t is time; u jis the velocity of the point with coordinate j in the fluid in the y-axis direction; ρ is the density of air; ν is the kinematic viscosity coefficient of air; ω is the angular velocity of the earth's rotation, ω=7.29×10 -5 s -1 ; ε ijk is the Levi-Cvita symbol. When ijk is arranged in order, ε ijk = 1, when ijk is reversed, ε ijk = -1, when any two of ijk are the same, ε ijk =0; η j is the component of the unit vector of the Earth's rotation direction on the j-axis, is the latitude, that is, x j The angle between the axis and the north-south direction; u k is the velocity of the point with coordinate k in the fluid in the y-axis direction; g is the acceleration of gravity; θ is the atmospheric potential temperature; T is the temperature; δ ij is the Kronecker function;

[0085] The thermodynamic equation can be expressed as:

[0086]

[0087] Formula (3) is the heat transfer equation. After ignoring latent heat and net radiation, the only source term that causes potential temperature change is molecular heat conduction. T is the thermal conductivity of air, K T is the molecular thermal conductivity, K is the temperature of the atmosphere when it is adiabatically expanded or compressed from its original pressure and temperature to the standard pressure; C P is the specific heat capacity of the fluid;

[0088] It should be noted that Einstein's summation convention is used in formulas (1) to (3), that is, if repeated subscripts appear in a term, the subscripts are summed.

[0089] Then use L0, u0, ρ0, T0 represents the reference quantity of length, speed, density, angular velocity and temperature. * represents dimensionless quantity, then each physical quantity can be expressed in dimensionless form as follows: x = x * L0;u=u * u0;ρ=ρ * ·ρ0; p=p * ·ρ0u0 2 ; θ=θ * ΔT0;

[0090]

[0091] Substituting the above dimensionless physical quantities into formula (1) to formula (3), we can obtain formula (4) to formula (6):

[0092]

[0093]

[0094]

[0095] After dimensionless transformation, the control equations have four dimensionless parameters, namely, Reynolds number (Re), Froude number (Fr), Prandtl number (Pr) and Rossby number (Ro).

[0096] The urban heat island circulation driven by the urban heat island effect occurs under the conditions of calm / weak wind and stable atmospheric stratification. This embodiment takes the idealized urban heat island circulation under calm wind inversion conditions as an example to conduct experimental simulation and flow field measurement, and can follow and meet the similarity principle, including: geometric similarity, boundary condition similarity and criterion number similarity.

[0097] Specifically, geometric similarity can be achieved by scaling the model without distortion. Since the invention does not correspond to a specific prototype city, it can satisfy geometric similarity.

[0098] The similarity of boundary conditions requires that the initial distribution of all statistical characteristics of dimensionless velocity field, temperature field, pressure field and density field, as well as the distribution on the boundary at all times thereafter, are exactly the same for the prototype and model flows, that is, the similarity of boundary conditions should be satisfied. Since it is based on field measurements, it is difficult to achieve in laboratory experiments and is also unnecessary, so appropriate simplifications are made. For example, under calm wind inversion conditions, turbulence is very weak due to the high atmospheric stability. Compared with the influence of large eddies caused by terrain undulations, the influence of small eddies and their distribution on the flow field can be ignored. And the purpose of the columnar water tank experimental system simulating the Coriolis force of this embodiment is to simulate and reproduce the idealized urban heat island circulation, so the terrain undulation changes can also be ignored, that is, it can be assumed that the temperature distribution of the urban ground is uniform. Due to the lack of incoming flow, the boundary conditions related to it do not need to be considered. Therefore, the simulation demonstration of the ground can be achieved through the semiconductor refrigeration sheet 210 and the heat sink 230.

[0099] It can be known from the similarity theory that when simulating urban heat island circulation, in order to achieve the similarity between the model and the prototype, the corresponding similarity criterion numbers should be similar, that is, the four dimensionless parameters after dimensionless conversion: Reynolds number (Re), Froude number (Fr), Prandtl number (Pr) and Rossby number (Ro) are all equal.

[0100] Furthermore, the Reynolds number (Re) is equal: The Reynolds number (Re) has an important influence on the turbulent structure of the fluid. In the real atmosphere, the Reynolds number can be as high as 107 to 109, which is difficult to achieve in the laboratory. However, all prototype surfaces are irregular aerodynamic rough structures, which are sufficient to prevent the formation of laminar sublayers. Therefore, at low Reynolds numbers, the flow structure can be close to the flow structure in the real atmosphere. In this case, the flow characteristics, area and turbulent structure of the turbulent vortex mainly depend on the geometric similarity and equivalence of the relevant scale ratios.

[0101] Froude number (Fr) equality: The Froude number (Fr) is the ratio of the kinetic energy of the fluid to the buoyancy potential energy required to overcome obstacles. It can be used to estimate the degree of critical separation and can also characterize the atmospheric stability. The smaller the Froude number, the more stable the atmosphere, which means the lower the wind speed, but at the same time it will cause the Reynolds number to decrease, resulting in a contradiction with the equality of the Reynolds number. In laboratory simulations, Froude number similarity and Reynolds number similarity cannot be satisfied at the same time, but if the Reynolds number in the model can be kept above the critical value required for fully turbulent flow, the mean flow and large eddy structure can be correctly simulated regardless of the difference in microscale vortices, and the diffusion effect of microscale vortices is small. On the other hand, when considering atmospheric flows with very high stability, the flow structure is mainly controlled by stratification (internal gravity waves). In this case, the Reynolds number has little effect on the flow structure, and the similarity of the Froude number is the main factor affecting the experimental results.

[0102] The expression of Froude number is:

[0103] Fr=u D / (ND) (7);

[0104] Among them, u D is the convection velocity scale of the urban heat island circulation, β is the thermal expansion coefficient, H0 is the urban surface heat flux, ρ0 is the reference density; N is the background buoyancy frequency, ρ is the density at different altitudes, dρdz is the atmospheric stratification; D is the city diameter / side length.

[0105] The Froude value of the actual atmosphere ranges from 0.002 to 0.025. In the columnar water tank experimental system simulating the Coriolis force of this embodiment, it is achieved through thermal convection density stratification, that is, the temperature difference between the semiconductor refrigeration plate 210 and the top insulating cover plate 311 drives the heat flux density stratification.

[0106] The Prandtl number (Pr) is equal: the Prandtl number for water at room temperature is 7, while that for air is 1. For fully turbulent flows, turbulent diffusion will always dominate molecular diffusion. Moreover, when the Prandtl number is greater than 1, the effect of molecular diffusion is even smaller. Therefore, the effect of the mismatch between the experimental system and the actual Prandtl number can be completely ignored when simulating atmospheric turbulent flows, especially when simulating flows dominated by convection.

[0107] Rossby number (Ro) is equal to the Rossby number (Ro), which is a parameter used in the Navier-Stokes equation to describe the relative importance between the Coriolis force and the inertial force in fluid flow. Its expression is:

[0108] Ro=u d / Df (8);

[0109] Where f is the Coriolis frequency,

[0110] The Coriolis force is the tangential component of the Coriolis force on the earth's surface, and is the result of the earth's rotation. When an object is stationary, it is not affected by the Coriolis force. When an object is moving, due to its own inertia, it always maintains its original direction and speed of movement. The direction of the Coriolis force is perpendicular to the direction of the object's movement, and has a certain influence on the direction of the object's movement, causing it to deflect to the right or left. Since the linear velocity of the earth's rotation is different in different places, in the northern hemisphere, when the airflow moves from north to south, that is, from the latitude with a lower rotation speed to the latitude with a higher rotation speed, the airflow will deviate from the meridian at the time of origin and deviate to the right, that is, the original north wind gradually turns into northeast wind. Because the Coriolis force on the equator is zero, objects moving horizontally on the equator will not deviate.

[0111] Therefore, under relatively flat terrain and neutral or stable atmospheric conditions, when the experimental system of this embodiment is used to model and simulate a city with a scale greater than 5 km (except when located at the equator), it is necessary to consider the Rossby number to be equal, especially when the city is located in a high-latitude area and the scale exceeds 10 km, the Rossby number must be considered to be equal, that is, it needs to meet the following conditions:

[0112]

[0113] Among them, Ro a is the prototype city Rossby number; is the convective velocity scale of the prototype urban heat island circulation; f a Coriolis frequency for the prototype city; is the convection velocity scale of the model urban heat island circulation; D a is the diameter or side length of the prototype city; Ro w is the Rossby number of the model city; f wis the Coriolis frequency of the model city; D w is the diameter or side length of the model city.

[0114] Therefore, when simulating the idealized urban heat island circulation under the condition of calm wind inversion using the columnar water tank experimental system for simulating the Coriolis force of this embodiment, and on the basis of ensuring geometric similarity, it is necessary not only to ensure the similarity of the Froude number, but also to ensure the similarity of the Rossby number, and to give the urban surface (heat sink 230) a certain heat flux density or temperature. In addition, the rotation frequency of the salt water solution in the columnar water tank 310 can be changed by changing the angular frequency of the deflection motor 110, but because the faster the rotation, the stronger the destructiveness to the linear density stratification, the rotation frequency also needs to be controlled, that is, it needs to meet the following requirements:

[0115]

[0116] Among them, f w is the angular frequency of the deflection motor 110; is the convective velocity scale of the model urban heat island circulation; is the convective velocity scale of the prototype urban heat island circulation; D a is the diameter or side length of the prototype city; D w is the diameter or side length of the model city; ω is the angular velocity of the earth's rotation; sin is the sine function; is latitude; g is gravitational acceleration; β w is the thermal expansion coefficient of the model city air (in this embodiment, it refers to the thermal expansion coefficient of the fluid used in the columnar water tank experiment); β a is the thermal expansion coefficient of the prototype city air; H w is the heat flux density of the model city; is the specific heat capacity of the model city air (in this embodiment, it refers to the specific heat capacity of the fluid used in the columnar water tank experiment); H a is the heat flux density of the prototype city; is the specific heat capacity of the prototype city air; ρ w is the air density of the model city (in this embodiment, it refers to the fluid density used in the columnar water tank experiment); ρ a is the fluid density of the prototype city.

[0117] Preferably, the angular frequency of the deflection motor 110 can be set to f w ≤0.0575rad / s, i.e. f w ≤0.3306rpm.

[0118] The columnar water tank experimental system for simulating the Coriolis force of the present invention arranges the temperature control system and the water tank experimental system on the deflection support system, forms a linear inversion layer through semiconductor refrigeration plates to simulate the heat island effect; at the same time, the water tank experimental system is driven by the deflection motor to rotate synchronously, and the influence of the Coriolis force on the urban meteorology and the heat island effect is simulated by rotation, thereby greatly improving the simulation accuracy of the temperature and airflow distribution inside the city.

[0119] Embodiment 2

[0120] like Figure 6 As shown, Figure 6 The present invention provides a flowchart of a flow field measurement method for a columnar water tank experimental system simulating the Coriolis force.

[0121] This embodiment provides a flow field measurement method for a columnar water tank experimental system simulating the Coriolis force, which is used in the columnar water tank experimental system simulating the Coriolis force of the first embodiment. The method includes:

[0122] Step 1: Pour the saline solution into the columnar water tank and seal the columnar water tank after the injection is completed.

[0123] Specifically, the salt water solution is injected into the columnar water tank through a through hole in the middle of the insulating cover plate, and after the injection is completed, the through hole is sealed with an insulating rubber plug to prevent the internal convection from being affected by the external environment.

[0124] Step 2: Set a number of semiconductor refrigeration sheets to a cooling mode until the salt water solution in the columnar water tank forms a stable linear inversion layer;

[0125] Specifically, the middle cooling plate and the edge cooling plate are both set to the cooling mode until the brine solution in the columnar water tank forms a stable linear inversion layer.

[0126] Step 3: Setting the installation angles of several cameras, and starting the deflection motor after setting the angular frequency of the deflection motor to simulate the Coriolis force;

[0127] Step 4: Set several semiconductor cooling chips to heating mode and set the light source.

[0128] Specifically, several semiconductor refrigeration plates are set to heating mode to simulate urban heat, and then the insulating rubber plug is replaced with a cross-plate light source. After the cross-plate light source is turned on, a cross-shaped light beam is emitted to provide light source for flow field measurement.

[0129] Step 5: Start several cameras to measure the flow field of the cylindrical water tank experimental system simulating the Coriolis force, and obtain several groups of cylindrical flow field measurement images;

[0130] Step 6: Perform cylindrical back-projection correction on several groups of cylindrical flow field measurement images respectively, and stitch the corrected groups of cylindrical flow field measurement images in sequence to obtain a panoramic cylindrical flow field measurement image based on multi-camera shooting.

[0131] It is to be understood that starting the deflection motor, setting the heating mode and the light source, and measuring the flow field through the camera can be performed simultaneously.

[0132] In an optional implementation, the angular frequency of the deflection motor may be set to simulate the effect of the Coriolis force on urban weather and urban heat island effect in different latitudes.

[0133] In an optional embodiment, the panoramic cylindrical flow field measurement image captured by multiple cameras is formed by stitching and fusing multiple images of the same scene with overlapping areas, and each image sequence is a two-dimensional projection of the physical scene in different coordinate systems. Directly stitching the captured images in a plane cannot meet the visual consistency. Therefore, it is necessary to project the images to be stitched into a standard coordinate system respectively, and then stitch the images. Among them, the cylindrical coordinates are relatively simple to transform and the projected image is independent of the position where it is projected onto the cylindrical surface. The cylindrical panoramic image described by it can meet 360° viewing in the horizontal direction and has a good visual effect. Therefore, in this embodiment, cylindrical back-projection correction is used for correction processing.

[0134] like Figure 7 and Figure 8 As shown, Figure 7 Schematic diagram of the principle of the cylindrical flow field back-projection correction algorithm provided by an embodiment of the present invention; Figure 8 It is a schematic diagram of the principle of stitching partial images of a cylindrical flow field into a panoramic image provided by an embodiment of the present invention.

[0135] Since cylindrical images are captured by multiple planar cameras, a single camera will inevitably produce cylindrical deformation when collecting images due to the limitations of the camera imaging principle, so cylindrical backprojection correction is also needed for processing. Cylindrical backprojection correction is a technology used to correct the distortion of cylindrical surface images. It is widely used in the fields of three-dimensional object surface texture reconstruction and defect detection. By projecting the image texture of the cylindrical surface onto a two-dimensional plane and using a linear interpolation algorithm to correct the missing pixel values, the distorted texture image is restored.

[0136] Specifically, the principle of the cylindrical back-projection algorithm is based on the projection relationship of the cylinder in the geometric space. By analyzing the geometric structure of the cylinder, the length of the minor semi-axis of the elliptical arc at the upper and lower edges of the cylinder is calculated, and then these parameters are used to project the image texture of the cylinder surface onto a two-dimensional plane. Since the texture of the cylinder surface will be distorted during the imaging process, it is necessary to fill the missing pixels through a linear interpolation algorithm to achieve complete texture image restoration.

[0137] Cylindrical back-projection correction technology is an effective image correction method that can significantly improve the distortion problem of cylindrical surface images. Its principle is as follows: Figure 7 As shown, where O is the observation point; Figure 7 (a) is the projection cylinder; Figure 7 (b) is the image to be projected; Figure 7 (b) is the cylindrical projection image;

[0138] Project the projection cylinder onto the horizontal and vertical planes of the observation point O to obtain the image to be projected and the cylindrical projection image, where P(x,y) is a point in the image to be projected, and P′(x′,y′) is the projection point corresponding to P(x,y) in the cylindrical projection image. Assume that the radius of the cylinder is r, that is, the radius of the columnar water tank is 0.5D, the arc angle (projection width angle) occupied by each image is θ, the image width is W, and the height is H, then the width of the cylindrical projection image is rθ, and the height is still H.

[0139] The angle occupied by a complete image is π. Assuming that the camera is approximately shot at equal angles, the overlap between two adjacent images is δ, and the total number of images required to stitch together a complete image is n, then the arc angle θ occupied by each image (i.e., the angle between cameras) can be approximated as:

[0140]

[0141] According to the cylindrical projection transformation formula, the cylindrical back-projection transformation formula is obtained, and its expression is:

[0142]

[0143] Where r is the radius of the cylindrical back projection; l is the length of the cylindrical back projection,

[0144] The calculated back-projection coordinates P(x, y) are applied to the original image to move each pixel to a new position. Interpolation methods can be used to process the transformation of pixel values ​​to ensure the continuity and integrity of the image and achieve local image correction.

[0145] Furthermore, the algorithm can be implemented using programming languages ​​such as MATLAB or C language, and the algorithm can be optimized and adjusted by adjusting parameters through experiments to improve computational efficiency and image correction quality.

[0146] For the image corrected by cylindrical back-projection, it is also necessary to perform local image sorting and splicing processing. If the number of images to be spliced ​​is n, the local image sorting and splicing processing includes the following steps:

[0147] S1: For each image in the n images of the sequence corrected by cylindrical back-projection, the normalized cross-power spectrum between it and each of the other images is calculated, and the peak value is used as the correlation between the images through inverse Fourier transform, that is, each image can get n-1 correlations;

[0148] S2: Construct an n×n two-dimensional array to store the correlation between any two images, and determine the head image and the tail image according to the correlation.

[0149] Obviously, the head image and the tail image will have one adjacent image, and each other image will have two adjacent images. In other words, if the "largest" 2 are selected from the n-1 correlations of each image according to the row, then the image in this row will be adjacent to one or two images corresponding to these two correlations; if the "largest" 2 are selected from the n-1 correlations of each image according to the column, then the image corresponding to this column will be adjacent to one or two images corresponding to these two correlations. Obviously, the intersection of rows and columns must be the "largest" correlation to be what is required. If there is only one value left after the intersection, it corresponds to the head image or the tail image, and the image with two values ​​after the intersection is the middle image.

[0150] S3: Distinguish the head image and the tail image according to the horizontal translation amount.

[0151] That is, if the horizontal translation of the image corresponding to the maximum correlation is negative, it is the head image. If it is positive, it is the tail image.

[0152] S4: Determine the entire image chain in sequence according to the head image, and complete the local image sorting and splicing processing.

[0153] That is, if the horizontal translation of an image is negative, the image will be placed on the right.

[0154] It is worth noting that the present invention performs cylindrical back-projection correction on the cylindrical flow field images taken by the camera and splices them with the local images in sequence to obtain a panoramic cylindrical flow field image based on multi-camera shooting. The camera realizes the visual simulation of urban meteorology and heat island effect, so that scientific researchers can more accurately and intuitively explain the formation mechanism under steady-state and non-steady-state conditions.

[0155] The flow field measurement method of the columnar water tank experimental system simulating the Coriolis force of the present invention is very convenient to operate. After a stable linear inversion layer is formed in the upper columnar water tank, the deflection motor at the lower part is started synchronously, so that the upper deflection support system and the temperature control system rotate synchronously together, thereby realizing the visualization of urban meteorology and heat island effect under the influence of the Coriolis force.

[0156] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant is intended to cover non-exclusive inclusion, so that the article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or device including the elements. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The orientation or position relationship indicated by "up", "down", "left", "right", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 of the present invention.

[0157] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A columnar water tank experimental system for simulating the Coriolis force, characterized in that: include: A deflection support system (100), a temperature control system (200), a water tank test system (300) and a measurement system (400); The deflection support system (100) comprises: a deflection motor (110) and a rotating disk (130), wherein an output end of the deflection motor (110) is connected to the rotating disk (130); Wherein, under the drive of the deflection motor (110), the water tank experimental system (300) rotates synchronously with the rotating disk (130); The temperature control system (200) is arranged on the rotating disk (130), and the temperature control system (200) comprises: a plurality of semiconductor cooling sheets (210), the plurality of semiconductor cooling sheets (210) are arranged at intervals, and each of the semiconductor cooling sheets (210) is independently controlled; The water tank experimental system (300) is arranged close to a plurality of the semiconductor cooling sheets (210), and a linear temperature inversion layer is formed in the water tank experimental system (300) through the semiconductor cooling sheets (210).

2. The columnar water tank experimental system for simulating the Coriolis force according to claim 1 is characterized in that: The deflection support system (100) further comprises: a transmission shaft (120) and a first oblique support rod (140); the transmission shaft (120) is coaxially connected to the output end of the deflection motor (110) and the rotating disc (130); a plurality of first oblique support rods (140) are provided, the plurality of first oblique support rods (140) are arranged at intervals, and the two ends of each first oblique support rod (140) are respectively connected to the transmission shaft (120) and the rotating disc (130).

3. The columnar water tank experimental system for simulating the Coriolis force according to claim 1 is characterized in that: At least one of the semiconductor refrigeration sheets (210) is located in the middle, and all other semiconductor refrigeration sheets (210) are arranged around the semiconductor refrigeration sheet (210) in the middle.

4. The columnar water tank experimental system for simulating the Coriolis force according to claim 1, characterized in that: Each of the semiconductor cooling plates (210) is square or circular, and a heat insulating layer is disposed outside each of the semiconductor cooling plates (210).

5. The columnar water tank experimental system for simulating the Coriolis force according to claim 1, characterized in that: The temperature control system (200) further comprises: a flexible heat dissipation layer (220) and a heat dissipation plate (230); a plurality of the semiconductor cooling sheets (210) are embedded in the flexible heat dissipation layer (220); the heat dissipation plate (230) is located between the water tank experiment system (300) and the semiconductor cooling sheets (210), the heat dissipation plates (230) are arranged in a one-to-one correspondence with the semiconductor cooling sheets (210), and a heat insulation layer is arranged outside each of the heat dissipation plates (230).

6. The columnar water tank experimental system for simulating the Coriolis force according to claim 1, characterized in that: The water tank experimental system (300) comprises: a columnar water tank (310), wherein the columnar water tank (310) is filled with a saline solution; The columnar water tank (310) is provided with a heat-insulating cover plate (311), a through hole is provided in the middle of the heat-insulating cover plate (311), and a light source or a heat-insulating rubber plug is arranged in the through hole.

7. The columnar water tank experimental system for simulating the Coriolis force according to claim 5, characterized in that: The measuring system (400) comprises: a camera (410) and an adjusting bracket (420); a plurality of the cameras (410) and the adjusting bracket (420) are provided, and the plurality of adjusting brackets (420) are arranged around the columnar water tank (310); each of the cameras (410) is respectively arranged on a corresponding adjusting bracket (420), and the vertical position or horizontal position of the corresponding camera (410) is adjusted by the adjusting bracket (420).

8. The columnar water tank experimental system for simulating the Coriolis force according to claim 2, characterized in that: It also includes: a support base (500) for supporting the deflection support system (100); The support base (500) comprises: a support column (510), a horizontal support rod (520), a second oblique support rod (530), a first bearing (540) and a second bearing (550); wherein the support column (510), the horizontal support rod (520) and the second oblique support rod (530) are each provided with a plurality of rods, and the support column (510), the horizontal support rod (520) and the second oblique support rod (530) are respectively connected in a one-to-one correspondence; the first bearing (540) is respectively connected to a plurality of the horizontal support rods (520), the second bearing (550) is respectively connected to a plurality of the second oblique support rods (530), the deflection motor (110) is fixedly connected to a plurality of the horizontal support rods (520), and the transmission shaft (120) is respectively coaxially connected to the first bearing (540) and the second bearing (550).

9. A flow field measurement method for a columnar water tank experimental system simulating the Coriolis force, used in the columnar water tank experimental system simulating the Coriolis force as claimed in any one of claims 1 to 8, characterized in that: Methods include: injecting saline solution into the columnar water tank, and sealing the columnar water tank after the injection is completed; Setting a plurality of semiconductor refrigeration sheets to a refrigeration mode until the salt water solution in the columnar water tank forms a stable linear inversion layer; Setting the installation angles of a plurality of cameras, and starting the deflection motor after setting the angular frequency of the deflection motor to simulate the Coriolis force; Then, several semiconductor cooling sheets are set to heating mode, and light sources are set; Start several cameras to measure the flow field of a cylindrical water tank experimental system simulating the Coriolis force, and obtain several groups of cylindrical flow field measurement images; Cylindrical back-projection correction is performed on several groups of cylindrical flow field measurement images respectively, and the corrected several groups of cylindrical flow field measurement images are spliced ​​in sequence to obtain panoramic cylindrical flow field measurement images based on multi-camera shooting.

10. The flow field measurement method of the columnar water tank experimental system simulating the Coriolis force according to claim 9, characterized in that: The angular frequency of the deflection motor is set to simulate the influence of the Coriolis force in different latitudes on urban meteorology and urban heat island effect.

Images