A low pressure wind tunnel system

Abstract

The application discloses a low-pressure wind tunnel system in the field of climate survey technology, and aims to solve the problem that the existing technology lacks simulation experiment equipment for analyzing the radiation error of a sounding sensor when measuring high-altitude atmospheric temperature, and the low-pressure wind tunnel system comprises a quartz tube, one end of the quartz tube is connected with a flow distribution tank, the flow distribution tank is connected with a plurality of air flow meters, and a flow control valve is arranged on a main joint hose; the other end of the quartz tube is connected with one side of a first three-way pipe, the other side of the first three-way pipe is connected with a vacuum control valve, the vacuum control valve is connected with a vacuum pump; the first three-way pipe is connected with a second three-way pipe, and the second three-way pipe is connected with a plurality of pressure gauges. The application can study the influence of factors such as altitude, air flow speed, solar azimuth and radiation intensity on the sounding sensor under controllable conditions, and meets the needs of the fields of radiation error research in complex atmospheric environment and high-altitude atmospheric detection.

Description

Technical Field

[0001] This invention relates to a low-pressure wind tunnel system, belonging to the field of climate surveying technology. Background Technology

[0002] The detection and mechanism analysis of climate change cannot be separated from the study of changes in the vertical structure of atmospheric temperature. In addition to changes in surface air temperature, the trend of changes in upper atmospheric temperature is also one of the key research areas.

[0003] When radiosonde sensors measure environmental information such as temperature in the upper atmosphere, they are typically placed on top of the radiosonde. This exposes the sensor directly to various forms of radiation in the upper atmosphere, meaning the measured values ​​are not only related to the actual atmospheric temperature but are also affected by solar radiation, long-wave radiation, and other forms of radiation. Among these, direct solar radiation is the primary factor affecting radiosonde measurements.

[0004] To obtain more accurate atmospheric temperature data, it is necessary to analyze the radiation error of upper-altitude atmospheric temperature detection. Ground-based equivalent simulation experiments can be used to conduct necessary research on the correction of solar radiation heating errors at a relatively low cost. Wind tunnels are the main experimental means for studying the radiation error of sounding temperature sensors, enabling the study of the effects of factors such as altitude, airflow velocity, solar azimuth, and radiation intensity on sounding sensors under controlled conditions. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-pressure wind tunnel system to meet the needs of fields such as radiation error research in complex atmospheric environments and upper atmospheric detection.

[0006] To achieve the above objectives, the present invention is implemented using the following technical solution: a low-pressure wind tunnel system, comprising a quartz tube, one end of which is connected to a flow distribution tank via a main connector hose, the flow distribution tank being connected to multiple air flow meters, the air flow meters being used to measure the air flow rate inside the quartz tube, and a flow control valve being provided on the main connector hose, the flow control valve being used to control the air flow rate inside the quartz tube; The other end of the quartz tube is connected to one side of the interface of the first tee tube, and the other side of the interface of the first tee tube is connected to a vacuum control valve, which is connected to a vacuum pump; the vacuum control valve is used to control the air pressure inside the quartz tube. The third port of the first tee tube is connected to a second tee tube, which is connected to multiple pressure gauges used to measure the air pressure inside the quartz tube.

[0007] Optionally, an adjustment mechanism for adjusting the height and horizontal position of the quartz tube is provided below the quartz tube.

[0008] Optionally, the adjustment mechanism includes a lifting platform, a horizontal slide rail, and multiple sliders. The horizontal slide rail is located on the lifting platform, and the sliders are all located on the horizontal slide rail and are slidably connected to the horizontal slide rail. The sliders are connected to a guide rail slider movable frame above them, and the guide rail slider movable frame is used to support the quartz tube and the first tee tube.

[0009] Optionally, the two ends of the quartz tube are respectively provided with a quartz front seal and a quartz rear seal, and a quartz tube movable bracket is provided in the lower middle part. The quartz front seal, the quartz rear seal and the quartz tube movable bracket are all connected to the corresponding guide rail slider movable bracket.

[0010] Optionally, the lifting platform is provided with a bracket on the side near the flow control valve. The bracket is used to place air flow meters. There are 4 air flow meters. One end of the air flow meter is connected to the flow distribution tank through a connector hose, and the other end is equipped with an air inlet filter system.

[0011] Optionally, the number of pressure gauges is two, namely a piezoresistive vacuum gauge and a vacuum pressure gauge. The piezoresistive vacuum gauge is used to measure air pressure greater than 100 Pa, and the vacuum pressure gauge is used to measure air pressure less than 100 Pa.

[0012] Optionally, it also includes a vacuum pressure stabilizing tank, with the lower part of the vacuum control valve connected to the vacuum pressure stabilizing tank, and the vacuum pressure stabilizing tank connected to the vacuum pump.

[0013] Optionally, a temperature sensor is provided inside the quartz tube. The temperature sensor is mounted on the inner wall of the quartz tube via a temperature sensor bracket and is electrically connected to a vacuum terminal. A vacuum connector is provided on the side wall of the first three-way tube for transmitting the signal from the temperature sensor to the outside.

[0014] Optionally, the ends of the quartz tube and the first tee tube that are far apart are provided with rectifier honeycomb assemblies, which are used to make the gas inside the tube evenly distributed.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: This invention controls the air pressure inside the quartz tube through a vacuum control valve and precisely controls the cross-sectional area of ​​the air entering through a flow control valve, thereby controlling the air flow. In conjunction with multiple air flow meters that monitor the air pressure range and pressure gauges that monitor the air flow range, it achieves precise control of the air pressure and air flow environment inside the quartz tube, effectively adjusting the correspondence between air pressure and flow, thus stabilizing the gas velocity inside the quartz tube. Combined with a solar simulator and atmospheric pressure corresponding to different altitudes, it can effectively simulate the process of heat exchange between the radiosonde sensor and the air under solar radiation during the normal ascent of the radiosonde. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of a low-pressure wind tunnel system in one embodiment of the present invention; Figure 2 This is a side view of a low-pressure wind tunnel system in one embodiment of the present invention; Figure 3 This is a schematic diagram of the support structure of a low-pressure wind tunnel system in one embodiment of the present invention; In the diagram: 1. Air flow meter, 2. Flow control valve, 3. Flow distribution tank, 4. Main connector hose, 5. Quartz tube, 6. First tee pipe, 7. Second tee pipe, 8. Quartz tube movable bracket, 9. Guide rail slider movable bracket, 10. Vacuum control valve, 11. Rectifier honeycomb assembly, 12. Temperature sensor bracket, 13. Vacuum terminal block, 14. Terminal vacuum connector, 15. Quartz front seal, 16. Quartz rear seal, 17. Lifting platform, 18. Horizontal slide rail, 19. Slider, 20. Vacuum pressure stabilizing tank, 21. Bracket. Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0020] like Figure 1As shown, the low-pressure wind tunnel system provided in this embodiment of the invention includes a quartz tube 5. The quartz tube 5 is made of quartz glass, which can ensure that light has high transmittance, reduce the reflection of radiation from the inner wall of the vacuum cavity inside the quartz tube 5, and the quartz has good mechanical strength, which can ensure that the experiment can be carried out normally under low pressure inside the vacuum cavity.

[0021] Meanwhile, quartz glass has a low radiation attenuation coefficient, which can be used to calculate the radiation intensity of the internal environment of the quartz tube by combining the radiation intensity attenuation formula, making it convenient for experimenters to study the radiation error of the sounding temperature sensor.

[0022] One end of the quartz tube 5 is equipped with a main connector hose 4, on which a flow control valve 2 is mounted. The main connector hose 4 is connected to a flow distribution tank 3 via a vacuum quick-connect fitting. The flow distribution tank 3 is connected in parallel to multiple air flow meters 1 via connector hoses. Figure 3 Specifically, there are four air flow meters 1, which are glass rotor flow meters with different ranges and accuracies, used to measure the air pressure inside the quartz tube 5. The air inlet of the air flow meter 1 is also equipped with an air inlet filtration system to control the removal of dust and impurities from the air inlet.

[0023] The other end of the quartz tube 5 is connected to the first tee pipe 6 via a flange. The first tee pipe 6 is a reducing tee pipe, and its left side is sealed to the vacuum control valve 10 via a straight-through reducer and a KF clamp. The lower part of the vacuum control valve 10 is connected to the vacuum pressure stabilizing tank 20 via a metal bellows and a KF clamp. The vacuum pressure stabilizing tank 20 is then connected to the vacuum pump via a metal bellows and a KF clamp. The vacuum pump can be composed of two dual-vane vacuum pumps connected in parallel, with a pumping efficiency of up to 40 m³ / s. 3 / h can simulate a low-pressure environment of 10~32 km.

[0024] The third port of the first tee pipe 6 is located at its upper part, and the third port is connected to the second tee pipe 7. The second tee pipe 7 is connected to the piezoresistive vacuum gauge and the vacuum pressure gauge respectively. The piezoresistive vacuum gauge is used to measure air pressure greater than 100 Pa, and the vacuum pressure gauge is a thermocouple vacuum gauge used to measure air pressure less than 100 Pa, which ensures the pressure working range of the system and improves the accuracy of pressure measurement.

[0025] A temperature sensor is installed inside the quartz tube 5. The temperature sensor is mounted on the inner wall of the quartz tube 5 via a temperature sensor bracket 12 and is electrically connected to the vacuum terminal 13. A terminal vacuum connector 14 is provided on the side wall of the first three-way tube 6. The terminal vacuum connector 14 is connected to the vacuum terminal 13 and together transmits the signal of the temperature sensor to the outside.

[0026] Since the vertical ascent speed of the radiosonde is often between 15 and 30 km / h, the cross-sectional area of ​​the air intake can be precisely controlled by the flow control valve 2 and the vacuum control valve 10, thereby controlling the flow rate. In conjunction with the air flow meter 1, the correspondence between air pressure and flow rate can be accurately adjusted to stabilize the gas velocity in the quartz tube 5 at about 20 km / h. With the help of the solar simulator and the atmospheric pressure corresponding to different altitudes, the process of heat exchange between the radiosonde sensor and the air under solar radiation during the normal ascent of the radiosonde can be simulated. Example

[0027] Based on Example 1, this example further includes a quartz front seal 15 and a quartz rear seal 16, which are connected to the front and rear ends of the quartz tube 5 respectively via O-rings and flanges. The quartz front seal 15 is connected to the main connector hose 4 via a straight-through reducer and a KF flange, and the quartz rear seal 16 is connected to the first tee pipe 6 via a flange. The quartz front seal 15 and the quartz rear seal 16 can effectively ensure the sealing of the inside of the quartz tube 5 and improve the accuracy of the experiment.

[0028] The ends of the quartz tube 5 and the first three-way tube 6 that are far apart are provided with a rectifier honeycomb assembly 11, which is used to make the gas inside the tube evenly distributed. Example

[0029] Combination Figure 2 Based on Example 2, this example also provides an adjustment mechanism below the quartz tube 5 for adjusting the height and horizontal position of the quartz tube 5.

[0030] The adjustment mechanism includes a lifting platform 17, a horizontal slide rail 18, and multiple sliders 19. The horizontal slide rail 18 is located on the lifting platform 17, and the sliders 19 are all located on the horizontal slide rail 18 and are slidably connected to the horizontal slide rail 18. The upper part of the sliders 19 is connected to the guide rail slider movable frame 9. A quartz tube movable bracket 8 is provided on the lower part of the outside of the quartz tube 5. The quartz front seal 15, the quartz rear seal 16, and the quartz tube movable bracket 8 are all connected to the corresponding guide rail slider movable frame 9, thereby supporting the quartz tube 5 and the first tee pipe 6.

[0031] The lifting platform 17 can drive the horizontal slide rail 18, sliders and quartz tube 5 to move up and down as a whole, thereby adjusting the height of the quartz tube 5. Then, by moving the positions of each slider 19 on the horizontal slide rail 18 together, the horizontal position of the quartz tube 5 can be adjusted. It is convenient to use and easy to operate.

[0032] A bracket 21 is provided on the side of the lifting platform 17 near the flow control valve 2. The bracket 21 is used to place the air flow meter 1. Specifically, two air flow meters 1 are symmetrically placed on both sides above the bracket 21.

[0033] The working principle of this invention is as follows: The vacuum pump and vacuum pressure stabilizing tank 20 are turned on to initiate the evacuation operation. After the vacuum pump and vacuum pressure stabilizing tank 20 have stabilized the internal air pressure of the quartz tube 5, the internal air pressure is adjusted by the vacuum control valve 10, and monitored by the piezoresistive vacuum gauge and vacuum pressure gauge.

[0034] When the values ​​monitored by the piezoresistive vacuum gauge and the vacuum pressure gauge reach the required air pressure value for simulation, adjust the flow distribution tank 3 and the flow control valve 2. At this time, observe the air flow value of the air flow meter 1. When the value monitored by the air flow meter 1 also reaches the required flow value for simulation, the experiment can begin.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A low-pressure wind tunnel system, characterized in that: Includes a quartz tube, one end of which is connected to a flow distribution tank via a main connector hose. The flow distribution tank is connected to multiple air flow meters, which are used to measure the air flow rate inside the quartz tube. A flow control valve is provided on the main connector hose, which is used to control the air flow rate inside the quartz tube. The other end of the quartz tube is connected to one side of the interface of the first tee tube, and the other side of the interface of the first tee tube is connected to a vacuum control valve, which is connected to a vacuum pump; the vacuum control valve is used to control the air pressure inside the quartz tube. The third port of the first tee tube is connected to a second tee tube, and the second tee tube is connected to multiple pressure gauges, which are used to measure the air pressure inside the quartz tube. The number of pressure gauges is 2, namely a piezoresistive vacuum gauge and a vacuum pressure gauge. The piezoresistive vacuum gauge is used to measure air pressure greater than 100 Pa, and the vacuum pressure gauge is used to measure air pressure less than 100 Pa. It also includes a vacuum pressure stabilizing tank, the lower part of which is connected to the vacuum control valve, and the vacuum pressure stabilizing tank is connected to the vacuum pump; The quartz tube is equipped with a temperature sensor, which is mounted on the inner wall of the quartz tube via a temperature sensor bracket and is electrically connected to a vacuum terminal. The side wall of the first three-way tube is provided with a vacuum terminal connector, which is used to transmit the signal of the temperature sensor to the outside. The ends of the quartz tube and the first tee tube that are far apart are provided with rectifier honeycomb assemblies, which are used to make the gas inside the tube evenly distributed.

2. The low-pressure wind tunnel system according to claim 1, characterized in that: The quartz tube is provided with an adjustment mechanism at its lower part for adjusting the height and horizontal position of the quartz tube.

3. A low-pressure wind tunnel system according to claim 2, characterized in that: The adjustment mechanism includes a lifting platform, a horizontal slide rail, and multiple sliders. The horizontal slide rail is located on the lifting platform, and the sliders are all located on the horizontal slide rail and are slidably connected to the horizontal slide rail. The sliders are connected to a guide rail slider movable frame above them, and the guide rail slider movable frame is used to support the quartz tube and the first tee tube.

4. A low-pressure wind tunnel system according to claim 3, characterized in that: The quartz tube is provided with a quartz front seal and a quartz rear seal at both ends, and a quartz tube movable bracket is provided at the lower middle part. The quartz front seal, the quartz rear seal and the quartz tube movable bracket are all connected to the corresponding guide rail slider movable bracket.

5. A low-pressure wind tunnel system according to claim 3, characterized in that: The lifting platform is equipped with a bracket on the side near the flow control valve. The bracket is used to place air flow meters. There are 4 air flow meters. One end of each air flow meter is connected to the flow distribution tank through a connector hose, and the other end is equipped with an air inlet filter system.

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