Test system, calibration device and test method

Abstract

The invention provides a test system, a calibration device and a test method. The test system comprises a hot wire probe which comprises an electric heating wire, a thermocouple and a supporting rod; the heating wire and the thermocouple are fixedly connected to the supporting rod; the hot-wire probe is used for performing flow velocity testing on fluid at a target position in a target flow field to obtain a flow velocity signal and performing temperature testing on the fluid at the target position to obtain a temperature signal; the electric heating wire and the thermocouple are located on the same vertical line, a first distance exists between the electric heating wire and the thermocouple, and the first distance enables the electric heating wire and the thermocouple not to influence each other under the conditions of flow velocity testing and temperature testing; the acquisition unit is connected with the hot-wire probe through a circuit; the temperature sensor is used for converting a flow velocity signal into a first electric signal and converting a temperature signal into a second electric signal; the calculating unit is connected with the collecting unit and used for determining the target temperature and the target flow speed of the target position based on the first electric signal and the second electric signal.

Description

Technical Field

[0001] This application relates to the field of testing technologies, and in particular, to a testing system, a calibration device, and a testing method. Background Art

[0002] Traditional testing systems usually need to introduce a variety of measuring devices into the flow field. The measuring devices will interfere with the natural state of the flow field, thereby affecting the accuracy of flow field temperature testing and flow velocity testing. At present, the hot-wire probes in the testing system are relatively large in size, and the layout between the hot wire and the thermocouple is unreasonable. Therefore, in the current testing system, the hot wire and the thermocouple will interfere with each other, and the accuracy of temperature testing and flow velocity testing of the testing system is relatively low. Summary of the Invention

[0003] Embodiments of this application provide a testing system, a calibration device, and a testing method.

[0004] According to the first aspect of this application, a testing system is provided. The testing system includes: a hot-wire probe, including a heating wire, a thermocouple, and a support rod; the heating wire and the thermocouple are fixedly connected to the support rod; the hot-wire probe is used to perform flow velocity testing on the fluid at a target position in a target flow field to obtain a flow velocity signal and perform temperature testing on the fluid at the target position to obtain a temperature signal; the heating wire and the thermocouple are on the same vertical line, and there is a first distance between the heating wire and the thermocouple, and the first distance can enable the heating wire and the thermocouple not to affect each other when performing flow velocity testing and temperature testing; an acquisition unit, electrically connected to the hot-wire probe; for converting the flow velocity signal into a first electrical signal and converting the temperature signal into a second electrical signal; a calculation unit, connected to the acquisition unit, for determining the target temperature and target flow velocity at the target position based on the first electrical signal and the second electrical signal.

[0005] According to an embodiment of this application, the support rod includes a vertical section and a horizontal section; one end of the vertical section is fixedly connected to one end of the horizontal section to form an L-shaped structure, and the vertical section and the horizontal section are perpendicular to each other; the heating wire and the thermocouple are respectively connected to the other end of the vertical section; the acquisition unit is connected to the other end of the horizontal section.

[0006] According to an embodiment of this application, the hot-wire probe further includes: a hot-wire probe rod, the hot-wire probe rod includes a first tip and a second tip; the first tip is parallel to the second tip; the first tip and the second tip are respectively connected to the vertical section of the support rod; the heating wire is fixedly connected between the first tip and the second tip.

[0007] According to an embodiment of the present application, the length of the heating wire is related to the distance between the first tip and the second tip: the heating wire includes a metal wire; the diameter of the metal wire is much smaller than the distance between the first tip and the second tip.

[0008] According to an embodiment of the present application, the acquisition unit includes a data conversion device; the data conversion device is connected to the heating wire in the hot-wire probe through the hot-wire probe rod and is used to convert the flow velocity signal into the first electrical signal; the data conversion device is connected to the thermocouple in the hot-wire probe and is used to convert the temperature signal into the second electrical signal.

[0009] According to a second aspect of the present application, there is provided a calibration device for calibrating the above-mentioned test system, including: a test inner tank, a clamping unit and a temperature control unit; the clamping unit is used to control the movement of the hot-wire probe relative to the test inner tank when connected to the hot-wire probe; the test inner tank is used to hold a stationary test liquid; the temperature control unit is arranged outside the test inner tank and is used to control the temperature of the test liquid.

[0010] According to an embodiment of the present application, the temperature control unit includes a liquid circulator and a sealed enclosure structure; the sealed enclosure structure surrounds the outside of the test inner tank, and the sealed enclosure structure has an opening above the test inner tank for inserting the hot-wire probe into the test inner tank; the circulation outlet of the liquid circulator is connected to the inlet end on one side of the sealed enclosure structure through a check valve, and the circulation inlet of the liquid circulator is connected to the outlet end on the other side of the sealed enclosure structure through a ball valve.

[0011] According to an embodiment of the present application, the clamping unit includes a driving device and a gripper; the driving device is located on one side of the test inner tank and is parallel to the test inner tank; the driving device is connected to the gripper and is used to control the movement of the gripper relative to the test inner tank; the gripper is arranged above the test inner tank and is used to grip the hot-wire probe.

[0012] According to an embodiment of the present application, the sealed enclosure structure includes a drain port and a vent port; the drain port is arranged at the bottom of the sealed enclosure structure and is used to drain the liquid in the sealed enclosure structure after calibration; the vent port is arranged at the top of the sealed enclosure structure and is used to discharge the gas in the sealed enclosure structure.

[0013] According to a third aspect of the present application, a testing method is provided, including: obtaining the correlation between the velocity and voltage of a hot-wire probe at different temperatures; receiving a first electrical signal and a second electrical signal sent by an acquisition unit; determining a target temperature at a target testing position based on the second electrical signal; determining a target correlation between the velocity and voltage corresponding to the target temperature; and determining a target flow velocity at the target testing position based on the target correlation and the first electrical signal. The obtaining of the correlation between the velocity and voltage of the hot-wire probe at different temperatures includes: determining velocity calibration points and temperature calibration points based on a set calibration range; and calibrating the hot-wire probe based on the velocity calibration points and temperature calibration points to obtain the correlation between the velocity and voltage of the hot-wire probe at different temperatures. Description of the Drawings

[0014] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become readily understood. In the drawings, several embodiments of the present application are shown by way of illustration and not limitation, wherein:

[0015] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0016] Figure 1 Shows the schematic composition structure of the testing system according to an embodiment of the present application Figure 1 ;

[0017] Figure 2 Shows the schematic composition structure of the testing system according to an embodiment of the present application Figure 2 ;

[0018] Figure 3 Shows the schematic composition structure of the testing system according to an embodiment of the present application Figure 3 ;

[0019] Figure 4 Shows the schematic composition structure of the calibration device according to an embodiment of the present application Figure 1 ;

[0020] Figure 5 Shows the schematic composition structure of the calibration device according to an embodiment of the present application Figure 2 ;

[0021] Figure 6 Shows the schematic composition structure of the calibration device according to an embodiment of the present application Figure 3 ;

[0022] Figure 7 Shows the schematic processing flow diagram of the testing method provided by an embodiment of the present application;

[0023] Figure 8Shows an application scenario diagram of the test method provided by an embodiment of the present application;

[0024] Figure 9 Shows another application scenario diagram of the test method provided by an embodiment of the present application.

[0025] Reference numerals: 1, hot-wire probe; 11, heating wire; 12, thermocouple; 13, support rod; 2, acquisition unit; 21, data conversion device; 3, calculation unit; 131, vertical section; 132, horizontal section; 4, hot-wire probe rod; 41, first tip; 42, second tip; 5, test inner groove; 6, clamping unit; 7, temperature control unit; 71, liquid circulator; 72, sealed enclosure structure; 711, check valve; 712, ball valve; 713, inlet end; 714, outlet end; 61, driving device; 62, gripper; 721, drain port; 722, exhaust port. Detailed implementation manners

[0026] To make the objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0027] In the following description, "some embodiments" are involved, which describe a subset of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0028] In the following description, the terms "first / second" involved are only used to distinguish similar objects, and do not represent a specific order for the objects. It can be understood that "first / second" can be interchanged with a specific order or sequence when allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art belonging to the technical field of the present application. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the present application.

[0030] The technical solutions of the present application will be further elaborated in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Figure 1 Shows the schematic composition structure of the test system according to an embodiment of the present application Figure 1。

[0032] Figure 2 shows the schematic composition structure of the test system according to the embodiment of the present application Figure 2 。

[0033] Figure 3 shows the schematic composition structure of the test system according to the embodiment of the present application Figure 3 。

[0034] Reference Figure 1 、 Figure 2 and Figure 3 , the test system according to the embodiment of the present application includes: a hot-wire probe 1, including a heating wire 11, a thermocouple 12 and a support rod 13; the heating wire 11 and the thermocouple 12 are fixedly connected to the support rod 13; the hot-wire probe 1 is used to measure the flow velocity of the fluid at a target position in a target flow field to obtain a flow velocity signal and measure the temperature of the fluid at the target position to obtain a temperature signal; the heating wire 11 and the thermocouple 12 are on the same vertical line, and there is a first distance between the heating wire 11 and the thermocouple 12, and the first distance can ensure that the heating wire 11 and the thermocouple 12 do not affect each other during the flow velocity measurement and temperature measurement; an acquisition unit 2, electrically connected to the hot-wire probe 1; used to convert the flow velocity signal into a first electrical signal and convert the temperature signal into a second electrical signal; a calculation unit 3, connected to the acquisition unit 2, used to determine the target temperature and target flow velocity of the target position based on the first electrical signal and the second electrical signal.

[0035] In some embodiments, the hot-wire probe 1 can be used to measure the flow velocity and temperature in a target flow field. The heating wire 11 can serve as a variable resistor in one branch of the Wheatstone bridge in a hot-wire anemometer, and the hot-wire anemometer is an instrument for measuring the flow velocity of a fluid. The fluid in the target flow field can include gases and liquids. The heating wire 11 can be used to heat the fluid and measure the flow velocity of the fluid at a target position in the target flow field based on the change in its resistance. The operating temperature range of the heating wire 11 can be -100 to 200 °C. The minimum velocity that the hot-wire anemometer can measure can be 0.005 m / s. The embodiments of the present application do not limit the specific hot-wire anemometer. The thermocouple 12 can be used to measure the temperature of the fluid at a target position in the target flow field. The temperature measurement accuracy of the thermocouple 12 can be ±0.5 °C. The support rod 13 can be used to fix the heating wire 11 and the thermocouple 12, ensuring that the heating wire 11 and the thermocouple 12 are on the same vertical line and maintaining a first distance. The acquisition unit 2 can be used to convert the flow velocity signal into a first electrical signal and convert the temperature signal into a second electrical signal. The first electrical signal can include: the electrical signal converted from the flow velocity signal. The first electrical signal reflects the information of the fluid flow velocity. The second electrical signal can include: the electrical signal converted from the temperature signal. The second electrical signal reflects the information of the fluid temperature. The target position can include: the specific position for measurement in the target flow field. The calculation unit 3 can be electrically connected to the acquisition unit 2. The calculation unit 3 can be used to process the first electrical signal and the second electrical signal to determine the target temperature and target flow velocity at the target position. The target temperature can include: the actual temperature of the fluid at the target position. The target flow velocity can include: the actual flow velocity of the fluid at the target position. The calculation unit 3 can specifically include a computer device. The embodiments of the present application do not limit the specific calculation unit 3. The first distance can specifically be 5 millimeters. The first distance can also include other distances, which are not limited in the embodiments of the present application. When the first distance is maintained between the heating wire 11 and the thermocouple 12, it can reflect the temperature and flow velocity of the flow field at the same target position, and realizes the functional independence of the heating wire 11 and the thermocouple 12, ensuring the accuracy and reliability of the temperature measurement and flow velocity measurement of the test system.

[0036] In the test system according to the embodiments of the present application, the hot-wire probe integrates a heating wire and a thermocouple, and the two are arranged along a vertical line and maintain a first distance where the temperature measurement and flow velocity measurement do not affect each other. Combining the data conversion of the acquisition unit and the calculation of the calculation unit, the flow velocity and temperature at the same target position can be obtained simultaneously, improving the efficiency and accuracy of the temperature measurement and flow velocity measurement of the test system.

[0037] In some embodiments, the support rod 13 includes a vertical section 131 and a horizontal section 132; one end of the vertical section 131 is fixedly connected to one end of the horizontal section 132 to form an L-shaped structure, and the vertical section 131 is perpendicular to the horizontal section 132; the heating wire 11 and the thermocouple 12 are respectively connected to the other end of the vertical section 131; the acquisition unit 2 is connected to the other end of the horizontal section 132.

[0038] As an example, the support rod 13 is composed of a vertical section 131 and a horizontal section 132. One end of the vertical section 131 is fixedly connected to one end of the horizontal section 132 to form an L-shaped structure, and the vertical section 131 is perpendicular to the horizontal section 132. The heating wire 11 and the thermocouple 12 are respectively connected to the other end of the vertical section 131 for testing the flow rate and temperature in the target flow field. The acquisition unit 2 is connected to the other end of the horizontal section 132 and is connected to the heating wire 11 and the thermocouple 12 through circuits, and is responsible for converting the flow rate signal into a first electrical signal and converting the temperature signal into a second electrical signal. The calculation unit 3 is connected to the acquisition unit 2 and uses the first electrical signal and the second electrical signal to determine the target temperature and target flow rate at the target position.

[0039] In some embodiments, the hot-wire probe 1 further includes: a hot-wire probe rod 4, and the hot-wire probe rod 4 includes a first tip 41 and a second tip 42; the first tip 41 is parallel to the second tip 42; the first tip 41 and the second tip 42 are respectively connected to the vertical section 131 of the support rod 13; the heating wire 11 is fixedly connected between the first tip 41 and the second tip 42.

[0040] In this embodiment, the hot-wire probe rod 4 can be used to support the heating wire 11 and form a loop. The heating wire 11 is connected to the support rod 13 through the hot-wire probe rod 4. The first tip 41 can be a part of the hot-wire probe rod 4 and is parallel to the second tip 42. The first tip 41 can be used to fix one end of the heating wire 11. The second tip 42 can be another part of the hot-wire probe rod 4 and is parallel to the first tip 41. The second tip 42 can be used to fix the other end of the heating wire 11. The distance between the first tip 41 and the second tip 42 can be the same as the length of the heating wire 11.

[0041] As an example, the hot-wire probe rod 4 includes a first tip 41 and a second tip 42, and the first tip 41 and the second tip 42 are arranged in parallel. The first tip 41 and the second tip 42 are respectively connected to the vertical section 131 of the support rod 13 to form a support structure. The heating wire 11 is fixedly connected between the first tip 41 and the second tip 42 to form a closed loop. The acquisition unit 2 is connected to the horizontal section 132 of the support rod 13 and is connected to the heating wire 11 through a circuit, and is responsible for converting the flow rate signal into a first electrical signal.

[0042] The test system according to the embodiments of the present application, the hot-wire probe integrates an electric heating wire and a thermocouple, and the two are arranged along a vertical straight line and maintain a first distance without affecting each other. The electric heating wire is fixed between two sharp needles to form a stable support and measurement loop, improving the installation accuracy and stability of the electric heating wire. Combining the data conversion of the acquisition unit and the calculation of the calculation unit, the flow velocity and temperature at the same target position can be obtained simultaneously, improving the efficiency and accuracy of the temperature test and flow velocity test of the test system.

[0043] In some embodiments, the length of the electric heating wire 11 is related to the distance between the first sharp needle 41 and the second sharp needle 42: the electric heating wire 11 includes a metal wire; the diameter of the metal wire is much smaller than the distance between the first sharp needle 41 and the second sharp needle 42.

[0044] In this embodiment, the electric heating wire 11 can be a metal wire with a diameter of 6.5 microns and a length of 2 millimeters, fixedly connected between the first sharp needle 41 and the second sharp needle 42, and the length of the electric heating wire 11 is the same as the distance between the sharp needles. Since the diameter of the electric heating wire 11 is much smaller than the distance between the first sharp needle 41 and the second sharp needle 42, the interference of the electric heating wire 11 on the target flow field is extremely small. The embodiments of the present application do not limit the specific diameter of the electric heating wire 11, nor the specific length of the electric heating wire 11.

[0045] In some embodiments, the acquisition unit 2 includes a data conversion device 21; the data conversion device 21 is connected to the electric heating wire 11 in the hot-wire probe 1 through the hot-wire probe rod 4, and is used to convert the flow velocity signal into a first electrical signal; the data conversion device 21 is connected to the thermocouple 12 in the hot-wire probe 1, and is used to convert the temperature signal into a second electrical signal.

[0046] In this embodiment, the acquisition unit 2 preprocesses the acquired flow velocity signal and temperature signal. The preprocessing may specifically include: signal filtering, signal amplification, and data calibration. The embodiments of the present application do not limit the specific preprocessing. The data conversion device 21 can be used to convert the preprocessed flow velocity signal and temperature signal into electrical signals through analog-to-digital conversion. The data conversion device 21 may specifically include a data acquisition card. The embodiments of the present application do not limit the specific data conversion device 21. The data conversion device 21 can be connected to the test software in the calculation unit 3. The data conversion device 21 can transmit the first electrical signal and the second electrical signal to the test software in the calculation unit 3.

[0047] The test system according to the embodiments of the present application, the hot-wire probe integrates an electric heating wire and a thermocouple, and the two are arranged along a vertical straight line and maintain a first distance without affecting each other. The electric heating wire is fixed between two sharp needles to form a stable support and measurement circuit. The electric heating wire has a small diameter, no coating on the surface, is sensitive, can generate signal feedback for small changes in the temperature and velocity of the surrounding liquid, can support measurement points with smaller characteristic dimensions, has less influence on the flow field, and the working temperature range of the electric heating wire is relatively wide, can support fluid velocity measurement in a relatively large temperature range. Combining the data conversion of the acquisition unit and the calculation of the calculation unit, the flow velocity and temperature at the same target position can be obtained simultaneously, improving the efficiency and accuracy of the temperature test and flow velocity test of the test system.

[0048] Figure 4 shows the composition structure schematic of the calibration device according to the embodiments of the present application Figure 1 。

[0049] Figure 5 shows the composition structure schematic of the calibration device according to the embodiments of the present application Figure 2 。

[0050] Figure 6 shows the composition structure schematic of the calibration device according to the embodiments of the present application Figure 3 。

[0051] Reference Figure 4 、 Figure 5 and Figure 6 According to [references], the calibration device according to the embodiments of the present application is used to calibrate the above test system. The calibration device includes: a test inner tank 5, a clamping unit 6 and a temperature control unit 7; when the clamping unit 6 is connected to the hot-wire probe 1, it is used to control the movement of the hot-wire probe 1 relative to the test inner tank 5; the test inner tank 5 is used to carry a stationary test liquid; the temperature control unit 7 is arranged outside the test inner tank 5 and is used to control the temperature of the test liquid.

[0052] In some embodiments, the test inner tank 5 can be used to carry a stationary test liquid. The test liquid can include: a liquid medium used to simulate the actual flow field environment in the calibration device. The embodiments of the present application do not limit the specific test liquid. The temperature control unit 7 can control the temperature of the test liquid to remain constant within the range of 0 to 95 °C. The embodiments of the present application do not limit the temperature of the specific test liquid. When the hot-wire probe 1 is connected to the clamping unit 6, the clamping unit 6 can control the position of the hot-wire probe 1 in the test inner tank 5, and the clamping unit 6 can adjust the position of the hot-wire probe 1 in multiple directions such as up and down, left and right, and rotation.

[0053] As an example, during the calibration process, the hot-wire probe 1 is fixed by the clamping unit 6, and the heating wire 11 and the thermocouple 12 of the hot-wire probe 1 are immersed in the static liquid in the test inner tank 5. The temperature control unit 7 heats or cools the liquid according to the preset temperature value. At the same time, the clamping unit 6 moves the hot-wire probe 1 according to the requirements of the calibration program, so that the hot-wire probe 1 can be measured under different positions and temperature conditions. The acquisition unit 2 is electrically connected to the hot-wire probe 1, and collects the flow rate signal and the temperature signal in real time, and converts them into electrical signals and transmits them to the calculation unit 3. The calculation unit 3 runs the calibration test software to process the received electrical signals.

[0054] The calibration device of the embodiment of the present application ensures that the hot-wire probe can be calibrated at extremely low flow rates by controlling the temperature of the test liquid in the test inner tank and cooperating with the clamping unit for clamping the hot-wire probe. The calibration device can support the calibration of different hot-wire probes, liquids, temperatures and speeds, and obtain the correlation between the speed and voltage of the hot-wire probe at different temperatures. Moreover, it can calibrate the hot-wire probe applicable to the temperature measurement and low-speed flow field velocity measurement, thereby improving the efficiency and accuracy of the temperature measurement and flow rate measurement of the test system.

[0055] In some embodiments, the temperature control unit 7 includes a liquid circulator 71 and a sealed enclosure structure 72; the sealed enclosure structure 72 surrounds the outside of the test inner tank 5, and the sealed enclosure structure 72 is provided with an opening above the test inner tank 5 for inserting the hot-wire probe 1 into the test inner tank 5; the circulation outlet of the liquid circulator 71 is connected to the inlet end 713 on one side of the sealed enclosure structure 72 through a check valve 711, and the circulation inlet of the liquid circulator 71 is connected to the outlet end 714 on the other side of the sealed enclosure structure 72 through a ball valve 712.

[0056] In this embodiment, the temperature control unit 7 is composed of a liquid circulator 71 and a sealed enclosure structure 72. The sealed enclosure structure 72 closely surrounds the outside of the test inner tank 5, and its top is provided with an opening for inserting the hot-wire probe 1 into the test inner tank 5. The circulation outlet of the liquid circulator 71 is connected to the inlet end 713 on one side of the sealed enclosure structure 72 through a pipeline with a check valve 711 to ensure that the liquid in the liquid circulator 71 can flow into the sealed enclosure structure 72 unidirectionally. The circulation inlet of the liquid circulator 71 is connected to the outlet end 714 on the other side of the sealed enclosure structure 72 through a pipeline with a ball valve 712, so that the liquid passing through the sealed enclosure structure 72 can flow back to the liquid circulator 71 for further processing. The liquid circulator 71 can be used to: heat or cool the liquid, and control the heated or cooled liquid to circulate into the sealed enclosure structure 72 to realize the control of the temperature of the test liquid in the test inner tank 5.

[0057] In some embodiments, the clamping unit 6 includes a driving device 61 and a gripper 62; the driving device 61 is located on one side of the test inner groove 5 and is parallel to the test inner groove 5; the driving device 61 is connected to the gripper 62 and is used to control the movement of the gripper 62 relative to the test inner groove 5; the gripper 62 is arranged above the test inner groove 5 and is used to clamp the hot-wire probe 1.

[0058] In this embodiment, the driving device 61 may include a lead screw guide rail. The lead screw guide rail is parallel to the test inner groove 5, and the gripper 62 is connected to the lead screw guide rail. When the driving device 61 receives a movement control instruction, it transmits power to the gripper 62 through the lead screw guide rail, driving the gripper 62 to perform a linear movement along the length direction of the test inner groove 5. The movement speed and position of the gripper 62 can be controlled by the driving device 61. The minimum movement speed of the driving device 61 to control the gripper 62 can be 0.005 m / s. The length of the test inner groove 5 can specifically be 90 cm.

[0059] In some embodiments, the sealing and surrounding structure 72 includes a drain port 721 and an exhaust port 722; the drain port 721 is arranged at the bottom of the sealing and surrounding structure 72 and is used to drain the liquid in the sealing and surrounding structure 72 after the calibration is completed; the exhaust port 722 is arranged at the top of the sealing and surrounding structure 72 and is used to discharge the gas in the sealing and surrounding structure 72.

[0060] In this embodiment, a drain port 721 is provided at the bottom of the sealing and surrounding structure 72. The drain port 721 is connected to a drainage system outside the calibration device through a pipeline. After the calibration of the test system is completed, the valve of the drain port 721 can be opened to drain the liquid in the sealing and surrounding structure 72 through the drain port 721. An exhaust port 722 is provided at the top of the sealing and surrounding structure 72. During the liquid circulation process, the exhaust port 722 can discharge the gas in the sealing and surrounding structure 72 to ensure that the sealing and surrounding structure 72 is filled with liquid. Specifically, the exhaust port 722 and the drain port 721 can be arranged near the outlet end 714 of the sealing and surrounding structure 72.

[0061] The calibration device of the embodiment of the present application controls the temperature of the test liquid in the test inner groove by controlling the circulation of the liquid in the sealing and surrounding structure, ensuring that the temperature of the test liquid remains stable. Cooperating with the clamping unit for clamping the hot-wire probe, it ensures that the hot-wire probe can be calibrated at an extremely low flow rate. The calibration device can support the calibration of different hot-wire probes, liquids, temperatures, and speeds, and obtain the correlation between the speed and voltage of the hot-wire probe at different temperatures. Moreover, it can calibrate the hot-wire probe applicable to temperature-variable and low-speed flow field velocity measurement, thereby improving the efficiency and accuracy of the temperature test and flow velocity test of the test system.

[0062] The processing flow in the test method provided by the embodiment of the present application will be described.

[0063] See Figure 7 , Figure 7 which is a schematic diagram of the processing flow of the test method provided by the embodiments of the present application, and will be described in conjunction with Figure 7 the steps S1101 - S1105 shown below.

[0064] Step S1101: Obtain the correlation between the velocity and voltage of the hot - wire probe at different temperatures.

[0065] In some embodiments, step S1101 may include: determining velocity calibration points and temperature calibration points based on a set calibration range; calibrating the hot - wire probe 1 based on the velocity calibration points and temperature calibration points to obtain the correlation between the velocity and voltage of the hot - wire probe 1 at different temperatures. Herein, the calibration range may include the temperature calibration range and velocity calibration range that the hot - wire probe 1 needs to cover during the calibration process. Divide multiple temperature intervals based on the temperature calibration range, and select multiple temperature calibration points within each temperature interval. Divide multiple velocity intervals based on the velocity calibration range, and select multiple velocity calibration points within each velocity interval. Calibrate the hot - wire probe 1 based on the velocity calibration points and temperature calibration points to obtain the correlation between the velocity and voltage of the hot - wire probe 1 at different temperatures. The embodiments of the present application do not limit the specific velocity calibration points and temperature calibration points.

[0066] Step S1102: Receive the first electrical signal and the second electrical signal sent by the acquisition unit.

[0067] Step S1103: Determine the target temperature of the target test position based on the second electrical signal.

[0068] Step S1104: Determine the target correlation between the velocity and voltage corresponding to the target temperature.

[0069] Step S1105: Determine the target flow velocity of the target test position based on the target correlation and the first electrical signal.

[0070] In some embodiments, first, the correlation between the velocity and voltage of the hot-wire probe 1 at different temperatures needs to be obtained. The correlation can be obtained by calibrating the test system in a calibration device. Specifically: based on the set calibration range, velocity calibration points and temperature calibration points are determined, and then the hot-wire probe 1 is calibrated based on the velocity calibration points and temperature calibration points, and the voltage values of the velocity and the heating wire 11 at different temperatures are recorded, so as to obtain the correlation between the velocity and the voltage. The hot-wire probe 1 is placed at the target test position, and the acquisition unit 2 receives the first electrical signal and the second electrical signal from the hot-wire probe 1. According to the second electrical signal, the test software in the calculation unit 3 determines the target temperature at the target test position. Then, from the previously obtained correlation, the target correlation between the velocity and the voltage corresponding to the target temperature is determined. Finally, the test software in the calculation unit 3, based on the target correlation and the first electrical signal, by means of interpolation or fitting, etc., calculates the target flow velocity at the target test position by inverse deduction.

[0071] The test method of the embodiment of the present application obtains the velocity-voltage curve at different temperatures through calibration, combines the real-time collected electrical signals and temperature information, and uses the calculation unit to determine the target flow velocity, which can realize the measurement of the flow velocity and temperature of an extremely low-speed flow field. By pre-calibrating the velocity-voltage curves in different temperature ranges, it is possible to automatically match the corresponding curves in the corresponding ranges according to the temperature measured by the thermocouple for velocity calculation, thereby supporting a wider range of complex working conditions and enhancing the applicability of the test system. In addition, the test method is applicable to various types of fluids, especially those fluids whose physical properties change greatly with temperature, improving the efficiency and accuracy of temperature testing and flow velocity testing in different fluid environments.

[0072] Figure 8 Fig. shows an application scenario diagram of the test method provided by the embodiment of the present application.

[0073] Reference Figure 8 , an application scenario of the test method provided by the embodiment of the present application. Applied to the temperature and flow velocity testing of the test system.

[0074] Step A1, determining the test working condition may include: before the test, determining the specific conditions of the test, including the velocity range, temperature range, size structure of the test area, and fluid properties, etc.

[0075] Step A2, calibrating the temperature-velocity-voltage curve may include: under the determined test working condition, calibrating the hot-wire probe 1 to establish the relationship curve between temperature, velocity and voltage. This step is the basis for subsequent accurate measurement.

[0076] Step A3, inserting the probe into the test point to obtain the temperature of the measurement point, may include: inserting the hot-wire probe 1 into the target test point and obtaining the real-time temperature information of the target test point through the thermocouple 12.

[0077] Step A4, automatically performing hardware settings according to the temperature and obtaining the probe feedback voltage, may include: according to the obtained temperature of the measurement point, the test software in the calculation unit 3 automatically adjusts the hardware settings of the hot-wire probe 1, and obtains the voltage value corresponding to the flow rate feedback by the hot-wire probe 1 through the acquisition unit 2.

[0078] Step A5, finding the calibration curve in the corresponding range according to the temperature and back-calculating the velocity value through the voltage, may include: using the real-time temperature information of the target test point to determine the corresponding curve range in the previously calibrated relationship curve between temperature, velocity and voltage, and combining the voltage value corresponding to the flow rate to back-calculate and obtain the flow rate value of the target test point.

[0079] It can be understood that Figure 8 the application scenarios of the test method are only some exemplary implementation manners in the embodiments of the present application. The application scenarios of the test method in the embodiments of the present application include but are not limited to Figure 8 the application scenarios of the test method shown.

[0080] Figure 9 Fig. shows an application scenario diagram of the test method provided by the embodiment of the present application.

[0081] Referring to Figure 9 , an application scenario of the test method provided by the embodiment of the present application. It is applied to the calibration of the test system by the calibration device.

[0082] Step B1, determining the calibration working conditions, may include: before calibration, determining the specific conditions of calibration, including the velocity range, temperature range, size structure of the test area and fluid properties of the fluid.

[0083] Step B2, dividing the temperature range, setting relevant parameters and calibrating, may include: according to the determined calibration working conditions, dividing the temperature range into multiple intervals, determining the velocity calibration points and temperature calibration points based on the set calibration range; calibrating the hot-wire probe 1 based on the velocity calibration points and temperature calibration points.

[0084] Step B3, obtaining the temperature-velocity-voltage curve, may include: through the calibration process, obtaining the relationship curve between velocity and voltage at different temperatures.

[0085] Step B4, verifying the calibration result and estimating the speed measurement error, may include: determining the speed value of non-sampling points, where the speed values of non-sampling points are not within the range of sampling points used in the calibration process. Evaluating the speed measurement error based on the speed values of non-sampling points. For example, statistical methods such as root mean square error (RMSE) or mean absolute error (MAE) can be used to quantify the magnitude of the error.

[0086] It can be understood that Figure 9 the application scenarios of the test method are only some exemplary implementation manners in the embodiments of the present application. The application scenarios of the test method in the embodiments of the present application include but are not limited to Figure 8 the application scenarios of the test method shown.

[0087] It should be understood that various forms of processes shown above can be used, reordering, adding or deleting steps. For example, the steps described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions disclosed in the present application can be achieved. No limitation is made herein.

[0088] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0089] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A test system comprising: Hot wire probes, including heating wires, thermocouples and support rods; The heating wire and the thermocouple are fixedly connected to the support rod; The hot wire probe is used to perform a flow velocity test on a fluid at a target position in a target flow field to obtain a flow velocity signal and to perform a temperature test on the fluid at the target position to obtain a temperature signal; the heating wire and the thermocouple are located on the same vertical line, and there is a first distance between the heating wire and the thermocouple, and the first distance enables the heating wire and the thermocouple to not affect each other when performing flow velocity test and temperature test; A collection unit connected to the hot wire probe through a circuit; used to convert the flow velocity signal into a first electrical signal and convert the temperature signal into a second electrical signal; A calculation unit is connected to the acquisition unit and is used to determine a target temperature and a target flow rate at the target position based on the first electrical signal and the second electrical signal.

2. The test system according to claim 1, wherein the support rod comprises a vertical section and a horizontal section; One end of the vertical section is fixedly connected to one end of the horizontal section to form an L-shaped structure, and the vertical section and the horizontal section are perpendicular to each other; The heating wire and the thermocouple are respectively connected to the other end of the vertical section; The collection unit is connected to the other end of the horizontal section.

3. The test system according to claim 1, wherein the hot wire probe further comprises: A hot wire probe rod, the hot wire probe rod comprising a first sharp needle and a second sharp needle; The first sharp needle is parallel to the second sharp needle; the first sharp needle and the second sharp needle are respectively connected to the vertical section of the support rod; The heating wire is fixedly connected between the first sharp needle and the second sharp needle.

4. The test system according to claim 3, wherein the length of the heating wire is related to the distance between the first sharp needle and the second sharp needle: The heating wire comprises a metal wire; a diameter of the metal wire is much smaller than a distance between the first sharp needle and the second sharp needle.

5. The test system according to claim 3, wherein the acquisition unit comprises a data conversion device; The data conversion device is connected to the heating wire in the hot-wire probe through the hot-wire probe rod, and is used to convert the flow velocity signal into the first electrical signal; The data conversion device is connected to the thermocouple in the hot wire probe and is used to convert the temperature signal into the second electrical signal.

6. A calibration device for calibrating the test system according to any one of claims 1 to 5, comprising: Test inner tank, clamping unit and temperature control unit; The clamping unit, when connected to the hot-wire probe, is used to control the hot-wire probe to move relative to the test inner slot; The test inner tank is used to carry a stationary test liquid; The temperature control unit is arranged outside the test inner tank and is used to control the temperature of the test liquid.

7. The calibration device according to claim 6, wherein the temperature control unit comprises a liquid circulator and a sealed surrounding structure; The sealing surrounding structure surrounds the outside of the test inner groove, and the sealing surrounding structure is provided with an opening above the test inner groove for inserting the hot wire probe into the test inner groove; The circulation outlet of the liquid circulator is connected to the inlet end of one side of the sealed surrounding structure through a check valve, and the circulation inlet of the liquid circulator is connected to the outlet end of the other side of the sealed surrounding structure through a ball valve.

8. The calibration device according to claim 6, wherein the clamping unit comprises a driving device and a clamp; The driving device is located at one side of the test inner slot, and the driving device is parallel to the test inner slot; The driving device is connected to the clamp and is used to control the movement of the clamp relative to the test inner slot; The clamp is arranged above the test inner groove and is used for clamping the hot wire probe.

9. The calibration device according to claim 7, wherein the sealing enclosure structure comprises a water outlet and an air outlet; The drain port is arranged at the bottom of the sealed enclosure structure, and is used to discharge the liquid in the sealed enclosure structure after the calibration is completed; The exhaust port is arranged at the top of the sealed surrounding structure and is used to exhaust the gas in the sealed surrounding structure.

10. A testing method comprising: Obtain the correlation between the speed and voltage of the hot wire probe at different temperatures; Receiving a first electrical signal and a second electrical signal sent by a collection unit; determining a target temperature at a target test location based on the second electrical signal; Determine a target correlation relationship between the speed and the voltage corresponding to the target temperature; determining a target flow rate at the target test location based on the target association relationship and the first electrical signal; The obtaining of the correlation between the speed and voltage of the hot wire probe at different temperatures includes: determining a speed calibration point and a temperature calibration point based on a set calibration range; The hot-wire probe is calibrated based on the speed calibration points and the temperature calibration points to obtain a correlation between the speed and voltage of the hot-wire probe at different temperatures.

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