Ice wind tunnel cloud water content measuring device

Abstract

The invention belongs to the technical field of ice wind tunnel calibration, and discloses an ice wind tunnel cloud water content measuring device, which comprises a measuring probe used for heating water / ice crystal-containing cloud airflow into saturated water vapor, slowing down after expanding in a measuring cavity, and measuring the airflow temperature and relative humidity in the cavity in real time through a temperature-humidity sensor, outputting temperature and relative humidity electric signals; the power supply and the resolving system are used for supplying power to the measuring probe, receiving the temperature and relative humidity electric signals and resolving the temperature and relative humidity electric signals into the water content, the total water content and the ice water content; and the display is connected with the power supply and the resolving system and is used for displaying the water content, the total water content and the ice water content. The problem that the water content measurement error of an existing ice wind tunnel is large is solved.

Description

Technical Field

[0001] This invention belongs to the field of ice wind tunnel calibration and cloud particle measurement technology, specifically relating to a device for measuring the water content of ice wind tunnel clouds. Background Technology

[0002] The ice wind tunnel requires control and adjustment of cloud water content (LWC), total water content (TWC), and ice water content (IWC) according to the test conditions. The existing common test method is the ice blade measurement method. The ice blade measurement method is affected by factors such as measuring tools and ice shape, which can interfere with the results. It is also limited under conditions of high wind speed and high water content. In addition, the ice blade device and the test piece cannot coexist, requiring measurements to be taken on different test trips, and real-time measurement cannot be achieved.

[0003] The cloud water content testing device based on the hot-wire measurement method calculates the water content by calculating the current change of the hot-wire device caused by the evaporation of supercooled water. However, this device has a large measurement error under high water content conditions due to power limitations.

[0004] A detection device is needed to meet the above-mentioned test and measurement requirements. Summary of the Invention

[0005] This invention addresses the problem of large measurement errors in the water content measurement of existing ice wind tunnels by providing an ice wind tunnel cloud water content measuring device for measuring the cloud water content (LWC), total water content (TWC), and ice water content (IWC) of clouds in icy wind tunnels.

[0006] The technical solution of this invention is implemented as follows: A device for measuring the water content of clouds and fog in an ice cave, comprising: The measuring probe is used to heat the airflow containing water / ice crystals into saturated water vapor, which expands and decelerates in the measuring cavity. The temperature and relative humidity of the airflow in the cavity are measured in real time by a temperature-humidity sensor, and the temperature and relative humidity electrical signals are output. The power supply and calculation system supplies power to the measuring probe and receives the aforementioned temperature and relative humidity electrical signals, then calculates them into water content, total water content, and ice water content. The display, connected to the power supply and calculation system, is used to display the water content, total water content, and ice water content in real time.

[0007] As a further aspect of the present invention: the measuring probe includes: The shell is designed as a bottle-shaped structure with an air inlet at the front end, a heater at the air inlet, and an exhaust port at the rear end, the size of which is smaller than that of the air inlet. The support arm is connected to the tail end of the housing. A temperature and humidity sensor is installed inside the support arm. One end of the temperature and humidity sensor extends into the cavity at the tail end of the housing, and the other end of the temperature and humidity sensor is electrically connected to the power supply and the calculation system.

[0008] As a further aspect of the present invention: a mounting plate is provided at the bottom of the support arm, and a socket is provided below the mounting plate, wherein the socket is connected to the temperature-humidity sensor via a cable.

[0009] As a further aspect of the present invention: the measuring probe is fixedly connected to a certain position in the ice wind tunnel test section via a mounting plate.

[0010] As a further aspect of the present invention: the housing includes an air intake section and an expansion section, both of which are cylindrical, with the diameter of the expansion section being larger than that of the air intake section. The two sections are connected by a smooth curve and their internal cavities are interconnected.

[0011] As a further aspect of the present invention: the air inlet is located at the front end of the air intake section, and the inner diameter of the air inlet is consistent with the inner diameter of the air intake section; The exhaust port is located at the bottom of the expansion section, and the diameter of the exhaust port is less than 50% of the inner diameter of the air inlet.

[0012] As a further aspect of the present invention, the connection between the support arm and the housing has a sealing design to prevent moisture from entering the support arm cavity.

[0013] As a further aspect of the present invention: the heater is disposed inside the intake section cavity; The heater consists of several layers of mesh heating plates spaced apart.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The measurement of cloud water content (LWC), total water content (TWC), and ice water content (IWC) characteristics by this invention does not affect product installation.

[0015] 2. The measurement principle of this invention is clear, and the main factor affecting the measurement accuracy is the sensor accuracy.

[0016] 3. This invention enables the measurement of wind tunnels under full wind speed and full water content conditions in small ice wind tunnels.

[0017] 4. The measurement results of this invention are directly output digitally, without any manual input of measurement and calculation processes.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a diagram showing the external shape of the measuring probe of the present invention.

[0020] Figure 2This is a structural diagram of the measuring device of the present invention, wherein 1-house, 2-exhaust port, 3-temperature-humidity sensor, 4-support arm, 5-air inlet, 6-heater, and 7-socket.

[0021] Figure 3 This is a schematic diagram illustrating the measurement principle of the present invention.

[0022] Figure 4 This is an installation effect diagram of the measuring device of the present invention, where 8 is the ice tunnel and 9 is the measuring probe.

[0023] Figure 5 This is an overview diagram of the measurement system of the present invention, wherein 9-measurement probe, 10-power supply and calculation system, and 11-display. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings.

[0025] In the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present invention.

[0026] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] The following is in conjunction with the appendix Figure 1-5 The embodiments of the present invention will be described in detail below.

[0028] Example 1 This invention provides a device for measuring the water content of clouds and fog in Ice Wind Cave 8, comprising: The measuring probe 9 is used to heat the water-containing / ice crystal cloud airflow into saturated water vapor, which expands and decelerates in the measuring cavity. The temperature and relative humidity of the airflow in the cavity are measured in real time by the temperature-humidity sensor 3, and the temperature and relative humidity electrical signals are output. The power supply and calculation system 10 supplies power to the measuring probe 9 and receives the aforementioned temperature and relative humidity electrical signals, then calculates them into water content, total water content and ice water content; The display 11, connected to the power supply and calculation system 10, is used to display the water content, total water content and ice water content in real time.

[0029] Furthermore, the measuring probe 9 includes: The shell 1 is designed as a bottle-shaped structure, with an air inlet 5 at the front end, a heater 6 at the air inlet 5, and an exhaust port 2 at the rear end. The size of the exhaust port 2 is smaller than that of the air inlet 5. Support arm 4 is connected to the tail end of housing 1. Temperature-humidity sensor 3 is provided inside support arm 4. One end of temperature-humidity sensor 3 extends into the cavity at the tail end of housing 1, and the other end of temperature-humidity sensor 3 is electrically connected to power supply and calculation system 10.

[0030] Furthermore, a mounting plate is provided at the bottom of the support arm 4, and a socket 7 is provided below the mounting plate. The socket 7 is connected to the temperature-humidity sensor 3 via a cable.

[0031] Furthermore, the measuring probe 9 is fixedly connected to a certain position in the ice tunnel 8 test section via a mounting plate.

[0032] Furthermore, the housing 1 includes an air intake section and an expansion section, both of which are cylindrical. The diameter of the expansion section is larger than that of the air intake section. The two sections are connected by a smooth curve and their internal cavities are interconnected.

[0033] Furthermore, the air inlet 5 is located at the front end of the air intake section, and the inner diameter of the air inlet 5 is the same as the inner diameter of the air intake section. The exhaust port 2 is located at the bottom of the expansion section, and the diameter of the exhaust port 2 is less than 50% of the inner diameter of the air inlet 5.

[0034] Furthermore, the connection between the support arm 4 and the housing 1 has a sealing design to prevent moisture from entering the cavity of the support arm 4.

[0035] Furthermore, heater 6 is installed inside the intake section cavity; The heater 6 consists of several layers of mesh heating plates spaced apart.

[0036] Example 2 This invention provides a device for measuring the water content of clouds and fog in an ice wind tunnel 8. The device consists of a measuring probe 9, a power supply and calculation system 10, and a display 11. The core component, the measuring probe 9, consists of a housing 1, a heater 6, an air inlet 5, an exhaust outlet 2, a support arm 4, and a temperature-humidity sensor 3.

[0037] Under low-temperature conditions, the saturated water vapor pressure E at the liquid surface in the wind tunnel without spraying is a calculable value, as shown in Formula 1:

[0038] in:

[0039]

[0040] The measuring probe 9 contains an air inlet 5 with several layers of mesh heaters 6 woven from heating wires. When the ice wind tunnel 8 creates a cloud field, supercooled water / ice crystals are evaporated by the heaters 6. Multiple heaters 6 ensure that the water vapor content reaches saturation. The high-speed airflow at this time contains water vapor produced by evaporation, and the water-containing airflow decelerates after expanding within the measuring cavity. The measuring cavity contains a temperature-humidity sensor 3, which measures the temperature T and relative humidity RH of the mixed airflow within the cavity in real time. The saturated water content E of the water vapor at the corresponding temperature and the measured water content are calculated using Formula 2:

[0041]

[0042] in: E - Saturated vapor pressure, Pa T - Air temperature, K V - air volume, m 3 RW - Water vapor ratio gas constant: 461.52 J / (kg*k) m - Air moisture content, kg AH - Water vapor density / absolute humidity. kg / m³ 3 Subtracting the water vapor content from the ambient temperature gives the actual water content of the current cloud and fog field.

[0043] The measuring probe 9 outputs an electrical signal from the temperature-humidity sensor 3. The power supply and calculation system 10 provides power to the heater 6 of the measuring probe 9 and processes the temperature-humidity signal output by the measuring probe 9 to calculate the water content (LWC), total water content (TWC), and ice water content (IWC) in real time.

[0044] This measuring device is installed in test section 8 of the ice wind tunnel. There is no equipment installed inside the test section, so it does not interfere with the installation of the test product in the test section. It can simultaneously measure cloud water content (LWC), total water content (TWC), and ice water content (IWC) while the product is under test.

[0045] Thus, the objective of this invention has been achieved.

[0046] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for measuring the water content of clouds and fog in ice caves, characterized in that, include: The measuring probe is used to heat the airflow containing water / ice crystals into saturated water vapor, which expands and decelerates in the measuring cavity. The temperature and relative humidity of the airflow in the cavity are measured in real time by a temperature-humidity sensor, and the temperature and relative humidity electrical signals are output. The power supply and calculation system supplies power to the measuring probe and receives the aforementioned temperature and relative humidity electrical signals, then calculates them into water content, total water content, and ice water content. The display, connected to the power supply and calculation system, is used to display the water content, total water content, and ice water content in real time.

2. The ice cave fog water content measuring device according to claim 1, characterized in that, The measuring probe includes: The shell is designed as a bottle-shaped structure with an air inlet at the front end, a heater at the air inlet, and an exhaust port at the rear end, the size of which is smaller than that of the air inlet. The support arm is connected to the tail end of the housing. A temperature and humidity sensor is installed inside the support arm. One end of the temperature and humidity sensor extends into the cavity at the tail end of the housing, and the other end of the temperature and humidity sensor is electrically connected to the power supply and the calculation system.

3. The ice cave fog water content measuring device according to claim 2, characterized in that, A mounting plate is provided at the bottom of the support arm, and a socket is provided below the mounting plate. The socket is connected to the temperature and humidity sensor via a cable.

4. The ice cave fog water content measuring device according to claim 3, characterized in that, The measuring probe is fixedly connected to a certain position in the ice wind tunnel test section via a mounting plate.

5. The ice cave fog water content measuring device according to claim 2, characterized in that, The housing includes an air intake section and an expansion section, both of which are cylindrical. The diameter of the expansion section is larger than that of the air intake section. The two sections are connected by a smooth curve and their internal cavities are interconnected.

6. The ice cave fog water content measuring device according to claim 5, characterized in that, The air inlet is located at the front end of the air intake section, and the inner diameter of the air inlet is the same as the inner diameter of the air intake section. The exhaust port is located at the bottom of the expansion section, and the diameter of the exhaust port is less than 50% of the inner diameter of the air inlet.

7. The ice cave fog water content measuring device according to claim 2, characterized in that, The connection between the outrigger and the housing has a sealing design to prevent moisture from entering the outrigger cavity.

8. The ice cave fog water content measuring device according to claim 5, characterized in that, The heater is installed inside the intake section cavity; The heater consists of several layers of mesh heating plates spaced apart.

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