Low Temperature Wind Tunnel Monitoring System

Abstract

This utility model discloses a low-temperature wind tunnel monitoring system, including an absolute pressure sensor, a differential pressure sensor, a temperature sensor, a humidity sensor, a total temperature sensor, a data acquisition card, and an industrial control computer. There are four absolute pressure sensors, respectively installed in the test section, the embedded test section, the stabilization section, and before the first corner of the wind tunnel. There are five differential pressure sensors, respectively installed in the test section, the embedded test section, the large-angle diffusion section, the power end, and before the second corner of the wind tunnel. There are four temperature sensors, respectively installed in the test section, the embedded test section, the front end of the large-angle diffusion section, and the rear end of the large-angle diffusion section. There are two humidity sensors, respectively installed before and after the stabilization section. There are two total temperature sensors, respectively installed before and after the stabilization section. The absolute pressure sensor, differential pressure sensor, temperature sensor, humidity sensor, and total temperature sensor are electrically connected to the data acquisition card and the industrial control computer. This utility model improves the accuracy of data measurement by rationally arranging the sensors.

Description

Technical Field

[0001] This utility model relates to the field of wind tunnel testing technology, and specifically to a low-temperature wind tunnel monitoring system. Background Technology

[0002] A cryogenic wind tunnel is a ground-based simulation device that can simulate meteorological conditions during flight, such as high-altitude and polar environments. As one of the core systems of wind tunnel experiments, the wind tunnel measurement system provides high-precision, multi-channel, and high-gain signal testing capabilities for aerodynamic experiments. The main parameters to be measured in a wind tunnel include pressure, humidity, temperature, and total temperature, all of which are obtained by corresponding sensors. Because the operating conditions vary in different parts of a wind tunnel, there are requirements for the sensors used and their installation locations. This is especially true in cryogenic wind tunnels, where internal parameters fluctuate significantly and icing is a concern. Improper sensor placement can lead to inaccurate measurement data and damage to the sensing equipment. Utility Model Content

[0003] This invention provides a low-temperature wind tunnel monitoring system that improves the accuracy of data measurement by rationally arranging sensors.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] The cryogenic wind tunnel monitoring system includes absolute pressure sensors, differential pressure sensors, temperature sensors, humidity sensors, total temperature sensors, a data acquisition card, and an industrial control computer. There are four absolute pressure sensors, located in the test section, embedded test section, stabilization section, and before the first bend of the wind tunnel. There are five differential pressure sensors, located in the test section, embedded test section, large-angle diffusion section, power end, and before the second bend of the wind tunnel. There are four temperature sensors, located in the test section, embedded test section, front of the large-angle diffusion section, and rear of the large-angle diffusion section. There are two humidity sensors, located before and after the stabilization section. There are two total temperature sensors, located before and after the stabilization section. The absolute pressure sensors, differential pressure sensors, temperature sensors, humidity sensors, and total temperature sensors are electrically connected to the data acquisition card and the industrial control computer.

[0006] Furthermore, it also includes an anemometer tubes and five-hole probes. There are three anemometer tubes, which are respectively installed in the contraction section, stabilization section and test section. The five-hole probes are installed in the test section of the wind tunnel. The axis of the probes is perpendicular to the airflow direction. The anemometer tubes and five-hole probes are connected to the data acquisition card and industrial control computer.

[0007] Furthermore, the total pressure end and static pressure end of the wind speed tube are respectively connected to the two pressure input ends of a differential pressure sensor.

[0008] Furthermore, the test section wall of the wind tunnel is provided with static pressure holes, and an absolute pressure sensor is installed inside the static pressure holes.

[0009] Furthermore, the wind speed tube is a Pitot tube.

[0010] Furthermore, the absolute pressure sensor, differential pressure sensor, and humidity sensor are equipped with separate transmitters.

[0011] Furthermore, the differential pressure sensor and the static pressure probe of the anemometer in the test section are equipped with anti-icing devices.

[0012] Furthermore, the anti-icing device is an electric heating element.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model's monitoring system improves the accuracy of data measurement by rationally arranging sensors inside the wind tunnel. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the wind tunnel for this utility model;

[0017] In the diagram: 1-Stable section, 2-Contraction section, 3-Experimental section, 4-First diffusion section, 5-First corner, 6-Second diffusion section, 7-Second corner, 8-Power section, 9-Third diffusion section, 10-Third corner, 11-Large angle diffusion section, 12-Fourth corner, 13-Embedded experimental section. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] In the description of the embodiments of this application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0020] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] like Figure 1 As shown, the low-temperature wind tunnel is a large closed pipe consisting of a stable section 1, a contraction section 2, a test section 3, a first diffusion section 4, a first corner 5, a second diffusion section 6, a second corner 7, a power end 8, a third diffusion section 9, a third corner 10, a large-angle diffusion section 11, and a fourth corner 12. The test section 3 is equipped with an embedded test section 13. This application provides a low-temperature wind tunnel monitoring system, including absolute pressure sensors, differential pressure sensors, temperature sensors, humidity sensors, total temperature sensors, a data acquisition card, and an industrial control computer. Four absolute pressure sensors are respectively installed in the test section 3, the embedded test section 13, the stabilization section 1, and before the first corner 5 of the wind tunnel, used to measure the absolute pressure inside the wind tunnel. Five differential pressure sensors are respectively installed in the test section 3, the embedded test section 13, the large-angle diffuser section 11, the power end 8, and the second corner 7 of the wind tunnel, used to measure the difference between two pressures. Four temperature sensors are respectively installed in the test section 3, the embedded test section 13, the front end of the large-angle diffuser section 11, and the rear end of the large-angle diffuser section 11 of the wind tunnel, used to measure the temperature inside the wind tunnel. Two humidity sensors are respectively installed before and after the stabilization section 1, used to measure the relative humidity inside the wind tunnel. Two total temperature sensors are respectively installed before and after the stabilization section 1, used to measure the total temperature inside the wind tunnel, i.e., the stagnation temperature of the airflow. The absolute pressure sensors, differential pressure sensors, temperature sensors, humidity sensors, and total temperature sensors are electrically connected to the data acquisition card and the industrial control computer. Absolute pressure sensor, differential pressure sensor, temperature sensor, humidity sensor, and total temperature sensor will collect various parameters of the wind tunnel in real time and transmit them to the data acquisition card. The data acquisition card will convert the analog signals collected by the sensors into digital signals and transmit them to the industrial control computer for storage and processing.

[0022] It also includes anemometers and five-hole probes for wind tunnel flow field calibration. There are three anemometers, respectively located in the contraction section (section 2), stabilization section (section 1), and test section (section 3). The total pressure end and static pressure end of the anemometer are connected to the two pressure input terminals of a differential pressure sensor. When airflow passes through the anemometer, a higher pressure is formed at the total pressure end and a lower pressure at the static pressure end. The differential pressure sensor measures the difference between these two pressures. Preferably, the anemometer is a Pitot tube. The five-hole probe is located in test section 3 of the wind tunnel, with its axis perpendicular to the airflow direction. The anemometers and five-hole probe are connected to a data acquisition card and industrial control computer. Static pressure holes are provided on the wall of the test section of the wind tunnel, and absolute pressure sensors are installed inside these holes.

[0023] Absolute pressure sensors, differential pressure sensors, and humidity sensors are equipped with separate transmitters. Separate transmitters are existing technology and are devices that separate the sensor and signal processing module. They typically consist of two parts: a sensor section and a transmitter module. The sensor can be installed in the environment where the measurement is required, while the transmitter module can be installed in a location that is easier to operate and maintain.

[0024] In test section 3, the differential pressure sensor and the static pressure probe of the wind speed tube are equipped with anti-icing devices. Preferably, the anti-icing device is an electric heating element.

[0025] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A cryogenic wind tunnel monitoring system, characterized by: The system includes an absolute pressure sensor, a differential pressure sensor, a temperature sensor, a humidity sensor, a total temperature sensor, a data acquisition card, and an industrial computer. There are four absolute pressure sensors, which are respectively set in front of the test section (3), the embedded test section (13), the stable section (1), and the first corner (5) of the wind tunnel. There are five differential pressure sensors, which are respectively set in front of the test section (3), the embedded test section (13), the large angle diffusion section (11), the power end (8), and the second corner (7) of the wind tunnel. There are four temperature sensors, which are respectively set in front of the test section (3), the embedded test section (13), the large angle diffusion section (11), and the large angle diffusion section (11) and the large angle diffusion section (11). There are two humidity sensors, which are respectively set in front of and behind the stable section (1). There are two total temperature sensors, which are respectively set in front of and behind the stable section (1). The absolute pressure sensor, differential pressure sensor, temperature sensor, humidity sensor, and total temperature sensor are electrically connected to the data acquisition card and the industrial computer.

2. The cryogenic wind tunnel monitoring system of claim 1, wherein: It also includes wind speed tubes and five-hole probes. There are three wind speed tubes, which are respectively set in the contraction section (2), the stabilization section (1), and the test section (3). The five-hole probes are set in the test section (3) of the wind tunnel. The axis of the probes is perpendicular to the airflow direction. The wind speed tubes, five-hole probes and data acquisition cards and industrial control computers are connected.

3. The cryogenic wind tunnel monitoring system of claim 2, wherein: The total pressure end and static pressure end of the wind speed tube are respectively connected to the two pressure input ends of a differential pressure sensor.

4. The cryogenic wind tunnel monitoring system of claim 2, wherein: The test section (3) of the wind tunnel is provided with static pressure holes on the wall, and an absolute pressure sensor is installed in the static pressure holes.

5. The cryogenic wind tunnel monitoring system of claim 2, wherein: The wind speed tube is located in the Pitot tube position.

6. The cryogenic wind tunnel monitoring system of any one of claims 1-5, wherein: The absolute pressure sensor, differential pressure sensor, and humidity sensor are equipped with separate transmitters.

7. The cryogenic wind tunnel monitoring system of any one of claims 1-5, wherein: The differential pressure sensor and the static pressure probe of the wind speed tube in the test section (3) are equipped with anti-icing devices.

8. The cryogenic wind tunnel monitoring system of claim 7, wherein: The de-icing device is an electric heating element.

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