A rotating oscillating heat pipe heat transfer multi-physics field testing device and operation method thereof

Abstract

The present invention relates to a rotating oscillating heat pipe heat transfer multi-physics field testing device and an operating method thereof, which are used to realize multi-physics field monitoring during the operation of the rotating oscillating heat pipe. A magnetically coupled resonant wireless power supply system and a heating element are used to provide a stable and controllable heat load for the evaporation end of the oscillating heat pipe, and sensors such as thermocouples and pressure probes are used to detect the temperature, internal pressure and other multi-physics information of the rotating oscillating heat pipe. The signal processing and conversion are realized by a signal processing module and a microcontroller that follows the rotation of the oscillating heat pipe, and the data is sent to a data acquisition system on a PC by wireless communication. Since the rotating part in the device of the present invention does not have physical contact with the external environment, it can reduce equipment wear, reduce signal interference, and realize stable and reliable acquisition of multi-physics fields such as temperature, pressure distribution and heat transfer performance inside the rotating oscillating heat pipe.

Description

Technical Field

[0001] The present invention relates to a rotating oscillating heat pipe heat transfer multi-physics field testing device and an operating method thereof. Applied to the field of enhanced heat transfer under rotating conditions, it can meet the state monitoring requirements of rotating oscillating heat pipes, simplify the experimental process, avoid device wear, reduce test costs, and reduce the impact of signal interference. Background Art

[0002] Oscillating heat pipe is a new type of heat pipe that is made of bent capillary tubes and relies on capillary force, unbalanced pressure, gravity, etc. to drive the gas-liquid plug in the tube to oscillate and circulate to achieve efficient heat exchange. Due to its simple structure, small size, low cost, good heat exchange performance, etc., it has been widely used in the field of enhanced heat exchange.

[0003] The nucleate boiling of the internal working fluid of traditional gravity heat pipes and rotary heat pipes is suppressed under high-speed rotation conditions, and the heat transfer performance decreases. However, oscillating heat pipes have multiple heat transfer modes such as sensible heat transfer, latent heat transfer, and expansion work, and can still achieve enhanced heat exchange under high rotation centrifugal acceleration. Therefore, oscillating heat pipes have obvious advantages in the field of enhanced heat dissipation of rotating parts. For example, in the process of drilling, milling, grinding and other mechanical processing, the introduction of oscillating heat pipe technology to dissipate heat from the tool can significantly increase the tool life, improve processing quality and processing efficiency.

[0004] From the previous experimental research on rotary oscillating heat pipes, the power supply of the oscillating heat pipe heating element and the transmission of the sensor signal are both realized through brush slip rings. This method is prone to slip ring wear and signal interference under high-speed rotation conditions, which limits the development of experiments. For example, in the already disclosed patents CN110160812A (an oscillating heat pipe, a rotary test platform and a heat exchange performance evaluation method) and CN111060557A (an axial rotary oscillating heat pipe test device and its use method), the stable loading of the rotary oscillating heat pipe heat load and the collection of temperature signals are realized. However, in these two devices, the power supply of the oscillating heat pipe heating element and the transmission of the sensor signal are both realized through contact conduction. This method cannot cope with the problem of mechanical wear of the contacts in a high-speed test environment. In addition, the signal generated by the sensor is generally a weak analog signal. This signal is transmitted through slip rings and other methods, which is prone to signal interference, resulting in poor measurement results.

[0005] Existing signal collectors based on wireless communication, such as patents CN103801985A (a built-in real-time continuous temperature measurement tool handle), CN110091215A (a wireless transmission intelligent tool handle detection system for real-time monitoring of milling force and vibration), and CN114323340A (a wireless temperature measurement device for a rotating mechanical body), all realize data transmission of sensor signals through wireless communication, but such wireless signal collectors do not have high-power wireless power supply function and cannot meet the loading requirements of the thermal load of the rotating oscillating heat pipe. Therefore, a rotating oscillating heat pipe multi-physical field monitoring device that can realize high-power wireless power supply and wireless signal transmission is needed. Summary of the invention

[0006] Purpose of the invention: In view of the problems of signal interference, mechanical wear, speed limit, etc. in the existing rotary oscillating heat pipe test device, the present invention provides a rotary oscillating heat pipe heat transfer multi-physics field test device based on wireless power supply and wireless communication and its operation method, and uses the magnetic coupling resonant wireless power supply system in the device to provide a stable and controllable heat load for the evaporation end of the oscillating heat pipe. The signal acquisition system at the rotating end completes the signal acquisition and conversion, forms a data packet and transmits the data wirelessly, and the data acquisition and storage are realized through the data acquisition system at the PC end.

[0007] Technical solution: In order to achieve the above invention purpose, the present invention provides a solution to realize the multi-physics field test of heat transfer of rotating oscillating heat pipes through magnetic coupling resonant wireless power supply technology and wireless communication technology. It mainly consists of a magnetic coupling resonant wireless power supply system, a rotating end signal acquisition system based on a microcontroller, a wireless data transmission system based on radio frequency communication, a PC end data acquisition system, and a spindle adapter, an oscillating heat pipe bracket, an oscillating heat pipe, a cover plate and other accessories. The overall schematic diagram of the device is as follows: Figure 1 shown.

[0008] Among them, the rotating end circuit, microcontroller, wireless communication module and signal processing circuit of the wireless power supply system are installed in a non-metallic housing;

[0009] Non-metallic shell, the oscillating heat pipe bracket is installed on the rotating shaft through the spindle adapter, and the rotating oscillating heat pipe is installed on the oscillating heat pipe bracket through the cover plate. The stationary end circuit of the wireless power supply system is installed on the rotating shaft and connected to the DC power supply through a wire, and the rotating end circuit is connected to the heating element of the oscillating heat pipe. The various sensors installed on the oscillating heat pipe are connected to the rotating end signal acquisition system based on the microcontroller. The wireless communication module system obtains information from the microcontroller through the data line and sends the data to the data acquisition system on the PC through radio frequency communication. The oscillating heat pipe heating element is powered by the magnetically coupled resonant wireless power supply system to realize the loading of the oscillating heat pipe heat load. The internal pressure, temperature and other information of the rotating oscillating heat pipe are obtained through various sensors, signal processing modules, microcontrollers and wireless communication modules that follow the rotation of the oscillating heat pipe.

[0010] The fixing and rotation of the rotating oscillating heat pipe are realized by using components such as a rotating shaft, a main shaft adapter, an oscillating heat pipe bracket, a cover plate and an insulating material.

[0011] The magnetic coupling resonant wireless power supply line system is generally divided into three parts: the transmitting end circuit 2, the resonant coil 3, and the receiving end circuit 4. Figure 2 As shown. The input power of the magnetic coupling resonant wireless power supply system is provided by a DC power supply 13. The DC output of the power supply is converted by the transmitting circuit 2 to form a high-frequency current that meets the working requirements of the magnetic coupling resonant system, and is output to the resonant circuit composed of the compensation circuit and the resonant coil 3 in the transmitting circuit 2, which excites the receiving resonant circuit to produce magnetic coupling resonance, generating a high-frequency alternating current, which is conditioned by the receiving circuit 4 to form a DC output to power the heating element of the oscillating heat pipe. Since the input power and output power of the wireless power supply system have high linearity, the control of the heating power of the oscillating heat pipe can be achieved by adjusting the DC power supply 13.

[0012] The rotating end signal acquisition system is composed of sensors such as thermocouples, pressure probes, signal processing module 18, microcontroller 6 and wireless communication module 17. Figure 3 According to the scale of the voltage signal output by the sensor and the analog input range of the microcontroller 6, the gain, compensation and other parameters of the signal processing module 18 are adjusted according to formula (1).

[0013]

[0014] Where Gain is the gain of the signal processing module, V i is the recognition accuracy of the microcontroller, V c is the scale value of the sensor. The compensation of the signal processing module is obtained through calibration according to the test environment and sensor type.

[0015] The signal processed by the signal processing module 18 is read into the microcontroller 6. After the microcontroller 6 completes the data conversion through the algorithm, it packages the obtained data according to the channel source, data length and other information of the data, and then transmits the packaged data to the wireless communication module through SPI for transmission. The limit sampling frequency of the rotating end signal acquisition system is calculated according to the parameters such as the baud rate, sampling time, and data packet size of the microcontroller chip according to formula (2), and the result is fed back to the operation interface of the data acquisition system 14 on the PC side.

[0016]

[0017] Where f is the limit sampling frequency of the signal acquisition system, n is the number of sensors, and t d is the single sampling time of the microcontroller, bit is the total number of bytes in the data packet, and B is the baud rate.

[0018] The data acquisition system 14 at the PC end establishes communication with the signal receiving end circuit 15 through the serial port protocol. The signal receiving end circuit 15 transmits the data packet received from the rotating end signal acquisition system to the data acquisition system 14 at the PC end. The data acquisition system 14 at the PC end decodes the data packet to realize the real-time display and storage of the sensor information. The signal flow in the experimental device is as follows: Figure 4 In addition, in the data acquisition system at the PC end, the wireless communication module in the signal receiving end circuit 15 can also issue instructions to the rotating end signal acquisition system to set parameters such as sampling frequency, offset value, data channel, etc.

[0019] The operating method of the rotating oscillating heat pipe heat transfer multi-physics field testing device of the present invention comprises the following steps:

[0020] Step 1: Make an oscillating heat pipe cavity according to the test requirements, use a vacuum pump to evacuate and inject a working fluid according to a set filling rate, seal it, and make an oscillating heat pipe 10 that meets the test requirements, such as Figure 5 As shown. Spray insulating paint on the oscillating heat pipe, wrap the heating wire 19, arrange the sensor, wrap the evaporation end 10-1 and the insulation end 10-2 with the insulation material 11, install the oscillating heat pipe bracket 9, and use screws to tighten the cover plate 12 to fix the oscillating heat pipe, as shown. Figure 6 shown.

[0021] Step 2: Connect the stationary end circuit 2 of the wireless power supply module to the DC power supply 13, connect the output of the rotating end circuit 4 of the wireless power supply module to the heating wire 19, connect the output of the sensor to the rotating end signal acquisition system, connect the signal acquisition system receiving end 15 to the data acquisition system 14 on the PC end, adjust the dynamic balance through the dynamic balance ring 7, and then connect the spindle adapter 5 to the rotating shaft 1.

[0022] Step 3: Set the test speed for the rotating shaft 1, start the signal acquisition system and the cold air pipeline 16, start the rotating shaft 1, turn on the DC power supply 13, provide the heating wire 19 of the rotating oscillating heat pipe with power that meets the test requirements, and start the PC-side data acquisition system 14 developed by the present invention. Its operation interface is as follows: Figure 7 As shown, the temperature, pressure and other information of the oscillating heat pipe are recorded.

[0023] Beneficial effects:

[0024] (1) The present invention provides a rotating oscillating heat pipe heat transfer multi-physics field testing device, which adopts a magnetic coupling resonant wireless power supply system to power the heating element of the oscillating heat pipe to realize the loading of the heat load of the oscillating heat pipe. Through a variety of sensors that follow the rotation of the oscillating heat pipe, a signal processing module, a microcontroller and a wireless communication module, the internal pressure, temperature and other information of the rotating oscillating heat pipe can be obtained; and the measurement data is transmitted by wireless communication, which can avoid the wear problem of equipment, and has the advantages of low cost, long life, simple operation, etc.

[0025] (2) The signal transmission in the present invention is completed by digital signal, and the signal has strong anti-interference ability. It can be used to carry out rotary oscillating heat pipe tests under high speed, large heat flux density and different physical parameters, and further deepen the research on the heat transfer performance and operation mechanism of rotary oscillating heat pipes.

[0026] (3) The temperature, internal pressure and other data of the oscillating heat pipe are packaged by the microcontroller and transmitted by wireless communication. The rotating part of the device has no hard connection with the outside world through signal lines and no physical contact with the external environment, which can reduce equipment wear and signal interference, and realize stable and reliable collection of multi-dimensional physical fields such as temperature, pressure distribution and heat transfer performance inside the rotating oscillating heat pipe.

[0027] (4) After the multi-sensor obtains the temperature, internal pressure and other physical information of the rotating oscillating heat pipe, data acquisition is realized through the signal processing module and microcontroller that follow the rotation of the oscillating heat pipe. The microcontroller uses a filtering algorithm to filter out signal interference and encodes the measured data into data packets for wireless transmission through a specific packaging method, which can improve the communication quality and the anti-interference ability of the signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 is a schematic diagram of a wireless power supply system of the present invention;

[0030] Figure 3 It is a structural diagram of the rotating end signal acquisition system of the present invention;

[0031] Figure 4is a flow chart of signals in the present invention;

[0032] Figure 5 is a schematic diagram of a rotary oscillating heat pipe used in the present invention;

[0033] Figure 6 It is a schematic diagram of the assembly of the oscillating heat pipe of the present invention;

[0034] Figure 7 It is the operation interface of the data acquisition system of the present invention;

[0035] Figure 8 is the temperature measurement curve in the embodiment;

[0036] Fig. 9 It is a connection diagram of the signal acquisition part of the present invention.

[0037] Names of the symbols in the figure:

[0038] 1- Rotation axis

[0039] 2-Stationary end circuit of wireless power supply system

[0040] 3-Resonant coil of wireless power supply system

[0041] 4-Rotation end circuit of wireless power supply system

[0042] 5-spindle adapter, 5-1-wiring through hole

[0043] 6- Microcontroller

[0044] 7-Dynamic balancing ring

[0045] 8-Non-metallic shell

[0046] 9-oscillating heat pipe bracket, 9-1-cold air channel, 9-2-auxiliary installation hole

[0047] 10-rotating oscillating heat pipe, 10-1-evaporation end, 10-2-insulation end, 10-3-condensation end, 10-4-liquid injection pipe

[0048] 11- Insulation materials

[0049] 12-Cover

[0050] 13-DC power supply

[0051] 14-Data acquisition system on PC

[0052] 15-Signal receiving circuit

[0053] 16-Cold air jet pipeline

[0054] 17-Wireless communication module

[0055] 18-Signal processing module

[0056] 19-Heating wire. DETAILED DESCRIPTION

[0057] In order to enable those skilled in the art to better understand the technical solutions in the patent application of the present invention, the technical solutions in the present application are described below by application examples in conjunction with the drawings in the present application. The implementation method described is only one of the implementation methods in the present application and does not represent all implementation methods. Based on the implementation methods in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of this application.

[0058] Figure 1 It is a schematic diagram of the overall structure of the present invention. Figure 2 is a schematic diagram of the wireless power supply system of the present invention, Figure 3 FIG. 1 is a diagram showing the structure of the rotating end signal acquisition system of the present invention. Figure 1-3 As shown, a rotating oscillating heat pipe heat transfer multi-physical field testing device mainly includes a wireless power supply system, a rotating end signal acquisition system, a data transmission system based on wireless communication, a PC end data acquisition system 14, and a spindle adapter 5, an oscillating heat pipe bracket 9, a rotating oscillating heat pipe 10, and a cover plate 12.

[0059] Fig. 9 is a connection diagram of the signal acquisition part of the present invention, refer to Fig. 9 The stationary end circuit 2 of the wireless power supply system is installed on the rotating shaft 1 and connected to the DC power supply 13 through a wire. The rotating end circuit 4 of the wireless power supply system is connected to the heating element (heating wire 19) of the oscillating heat pipe. The various sensors installed on the oscillating heat pipe are connected to the rotating end signal acquisition system based on the microcontroller 6. The wireless communication module system obtains information from the microcontroller 6 through the data line and sends the data to the data acquisition system 14 on the PC through radio frequency communication.

[0060] Among them, the wireless power supply system is a magnetically coupled resonant wireless power supply system, which powers the oscillating heat pipe heating element to realize the loading of the oscillating heat pipe heat load. Through a variety of sensors, signal processing modules, microcontrollers and wireless communication modules that follow the rotation of the oscillating heat pipe, the internal pressure, temperature and other information of the rotating oscillating heat pipe can be obtained.

[0061] The wireless power supply system is divided into three parts: the stationary end circuit 2 (transmitter end circuit), the resonant coil 3, and the receiving end circuit 4. The input power of the magnetic coupling resonant wireless power supply system is provided by a DC power supply 13. The DC output of the power supply is converted by the transmitting end circuit 2 to form a high-frequency current that meets the working requirements of the magnetic coupling resonant system, and is output to the resonant circuit composed of the compensation circuit in the transmitting end circuit 2 and the resonant coil 3, which excites the receiving end resonant circuit to produce magnetic coupling resonance and generate high-frequency alternating current. After conditioning by the receiving end circuit 4, a DC output is formed to power the heating element of the oscillating heat pipe. Since the input power and output power of the wireless power supply system have high linearity, the control of the heating power of the oscillating heat pipe can be achieved by adjusting the DC power supply 13.

[0062] The rotating end circuit 4, microcontroller 6, wireless communication module 17 and signal processing circuit 18 of the wireless power supply system are all installed in the non-metallic housing 8; the non-metallic housing 8, the oscillating heat pipe bracket 9 is installed to the rotating shaft 1 through the spindle adapter 5, and the rotating oscillating heat pipe 10 is installed on the oscillating heat pipe bracket 9 through the cover plate 12. The housing of the wireless power supply system and the rotating end signal acquisition system is made of non-metallic materials, which can reduce energy loss and signal attenuation.

[0063] The rotating end signal acquisition system is composed of a thermocouple, a sensor, a signal processing module 18, a microcontroller 6 and a wireless communication module 17. Figure 3 According to the scale of the voltage signal output by the sensor and the analog input range of the microcontroller 6, the gain, compensation and other parameters of the signal processing module 18 are adjusted according to formula (1).

[0064]

[0065] Where Gain is the gain of the signal processing module, V i is the recognition accuracy of the microcontroller, V c is the scale value of the sensor. The compensation of the signal processing module is obtained through calibration according to the test environment and sensor type.

[0066] The signal processed by the signal processing module 18 is read into the microcontroller 6. After the microcontroller 6 completes the data conversion through the algorithm, it packages the obtained data according to the channel source, data length and other information of the data, and then transmits the packaged data to the wireless communication module through SPI for transmission. The limit sampling frequency of the rotating end signal acquisition system is calculated according to the parameters such as the baud rate, sampling time, and data packet size of the microcontroller chip according to formula (2), and the result is fed back to the operation interface of the data acquisition system 14 on the PC side.

[0067]

[0068] Where f is the limit sampling frequency of the signal acquisition system, n is the number of sensors, and t d is the single sampling time of the microcontroller, bit is the total number of bytes in the data packet, and B is the baud rate.

[0069] The data acquisition system 14 at the PC end establishes communication with the signal receiving end circuit 15 through the serial port protocol. The signal receiving end circuit 15 transmits the data packet received from the rotating end signal acquisition system to the data acquisition system 14 at the PC end. The data acquisition system 14 at the PC end decodes the data packet to realize the real-time display and storage of the sensor information. The signal flow in the experimental device is as follows: Figure 4 In addition, in the data acquisition system at the PC end, the wireless communication module in the signal receiving end circuit 15 can also issue instructions to the rotating end signal acquisition system to set parameters such as sampling frequency, bias value, data channel, etc. The operating method of the above-mentioned rotating oscillating heat pipe heat transfer multi-physics field testing device includes the following steps:

[0070] (1) According to the test requirements, an oscillating heat pipe cavity of the required material and inner diameter is manufactured (in this embodiment, the material is copper and the inner diameter is 3 mm. In the following, the contents in the brackets "for example" are all the conditions of this embodiment 1). A vacuum pump is used to reduce the pressure in the cavity to the experimental requirement (for example, 0.01 Pa). The connection pipeline between the cavity and the vacuum pump is cut off. Then, the working medium is injected according to the filling rate required by the test (for example, the filling rate is 50%, and the working medium is 1.3 mL of ethanol). After the injection is completed, the cavity is sealed by ultrasonic welding to manufacture an oscillating heat pipe 10 that meets the test requirements. Figure 5 shown.

[0071] After spraying insulating paint on the outer wall of the evaporation end 10-1 of the oscillating heat pipe 10, wrap the heating wire 19, paste the thermocouple temperature measurement point at the position where the temperature needs to be measured (such as the evaporation end 10-1 and the condensation end 10-3), and use the insulation material 11 to wrap the evaporation end 10-1 and the insulation end 10-2 of the oscillating heat pipe. Install the oscillating heat pipe wrapped with insulation material into the oscillating heat pipe bracket 9, and insert the injection pipe 10-4 at the head of the oscillating heat pipe into the auxiliary installation hole 9-2 of the oscillating heat pipe bracket 9, so that the condensation end 10-3 of the oscillating heat pipe is located at the position of the cold air channel 9-1 of the oscillating heat pipe bracket 9, so as to achieve the fixation of the oscillating heat pipe 10, as shown in FIG. Figure 6 shown.

[0072] (2) Figure 3 : is a diagram of the structure of the rotating end signal acquisition system of the present invention, such as Figure 3As shown, the output of the thermocouple is connected to the signal processing module 18, and the gain of the signal processing module 18 is set according to the output voltage of the thermocouple and the analog reading range and accuracy of the microcontroller 6 (for example, below 200°C, the graduation of the K-type thermocouple is 0.042mV, the reading range of the analog input port of the microcontroller is 0-5V, and the accuracy is 10 bits, then the gain of the signal processing module 18 needs to be set to 125 or above). The output of the signal processing module is connected to the analog input port of the microcontroller 6, and the interference of the signal is filtered out by a filtering algorithm (for example, a mean filter is used to filter out high-frequency periodic interference, and a threshold filter is used to filter out low-frequency random interference). After data conversion, the data is packaged and then driven to send the wireless communication module to the outside (for example, the amplified thermocouple signal is converted into temperature, and the header and tail of the data packet are generated according to the length of the data and the channel source, and sent to the outside through Bluetooth, radio frequency, wifi, etc.). The flow chart of the sensor signal is shown as follows Figure 4 The heating wire 19 is connected to the rotating end circuit 4 of the wireless power supply system through a wire passing through the wiring through hole 5-1 on the main shaft connector 5.

[0073] Install the spindle joint 5 onto the rotating spindle 1, connect the stationary end circuit 2 of the wireless power supply system to the DC power supply 13 through a wire, adjust the spacing of the resonant coil 3 of the wireless power supply system to 5 mm, manually rotate the spindle joint 5, and check for interference.

[0074] (3) The signal receiving circuit 15 establishes serial communication with the computer 14 through a data line and starts the data acquisition system 14 on the PC. The interface is as follows: Figure 7 As shown, turn on the wireless communication module 17, the microcontroller 6, and the switch of the signal amplification circuit 18, and issue instructions to the rotating end signal acquisition system through the PC-side data acquisition system 14 to set the sampling frequency, bias value, data channel and other parameters, for example (sampling frequency 10Hz, bias value -1, data channel 0). Set the speed of the rotating shaft 1 (for example, 3000r / min), start the rotating shaft 1, open the cold air jet pipeline 16, and spray cold air of a certain pressure and temperature (for example, 0.4Mpa, 4°C) to the condensing end 10-3 of the oscillating heat pipe, turn on the DC power supply 13, and provide a certain power (for example, 20W) to the heating wire 19. Use the PC-side data acquisition system 14 to run the data acquisition system, record the temperature information of the oscillating heat pipe, and obtain the temperature change curve of the measuring point as shown in FIG. Figure 8 The heat transfer performance of the oscillating heat pipe 10 under the physical and operating parameters is obtained through data processing.

[0075] From the temperature change curve, we can see that before the wireless power supply system is turned on, due to the effect of cold air at the condensing end of the oscillating heat pipe, the signal acquisition system observes that the temperature of the condensing end of the oscillating heat pipe drops. After the wireless power supply system starts to power the heating element, the signal acquisition system can detect that under the action of the heat load, the temperature of the evaporating end and the condensing end of the oscillating heat pipe gradually increases, and then reaches a stable stage, which proves that the wireless power supply system can realize wireless power supply and has stable power output.

[0076] The temperature of the evaporation end collected by the signal acquisition system can clearly observe the startup and stabilization process of the oscillating heat pipe. Since the test data of the sensor is transmitted in the form of digital signals, the anti-interference ability of the signal is improved, and the temperature signal is minimally interfered with, verifying the reliability of the signal acquisition system.

[0077] pass Figure 8 The temperature change curve of the evaporation end of the oscillating heat pipe can obtain the start-up performance of the oscillating heat pipe 10, such as the rise time, peak time, and stabilization time. Through the temperature of the evaporation end and the condensation end during the stable working stage, the heat transfer performance of the oscillating heat pipe 10, such as the thermal resistance and equivalent heat transfer coefficient, can be obtained under the physical and operating parameters. Since the heating element of the oscillating heat pipe is powered by wireless power supply and the measurement data is transmitted by wireless communication, there is no equipment wear caused by rotation during the test process.

Claims

1. A rotating oscillating heat pipe heat transfer multi-physics field testing device, characterized in that: Including: wireless power supply system, data transmission system, rotation end signal acquisition system, PC end data acquisition system, spindle adapter, oscillating heat pipe bracket, oscillating heat pipe, cover plate; Some components of the wireless power supply system are installed in a non-metallic housing (8); The non-metallic shell and the oscillating heat pipe bracket (9) are mounted on the rotating shaft (1) via a main shaft adapter (5) to form a rotating part, and the rotating oscillating heat pipe (10) is mounted on the oscillating heat pipe bracket (9) via a cover plate (12); The wireless power supply system is a magnetic coupling resonance wireless power supply system, which supplies power to the oscillating heat pipe heating element to achieve thermal loading of the oscillating heat pipe heat load; The stationary end circuit (2) of the wireless power supply system is installed on the rotating shaft (1) of the test device and connected to a DC power supply (13) through a wire; the rotating end circuit (4) of the wireless power supply system is connected to the heating element of the oscillating heat pipe; The sensor installed on the oscillating heat pipe is connected to the rotating end signal acquisition system based on the microcontroller (6). The wireless communication module system obtains information from the microcontroller (6) through a data line and sends the data to the data acquisition system (14) on the PC through radio frequency communication.

2. The rotating oscillating heat pipe heat transfer multi-physics field testing device according to claim 1, characterized in that: The wireless power supply system is divided into three parts: a stationary end circuit (2) of the wireless power supply system, a resonant coil (3) of the wireless power supply system, and a rotating end circuit (4) of the wireless power supply system. The input power of the wireless power supply system is provided by a DC power supply (13). The DC output of the power supply is converted by the stationary end circuit (2) of the wireless power supply system to form a high-frequency current that meets the working requirements of the magnetic coupling resonance system. The high-frequency current is output to a resonant circuit composed of a compensation circuit in the stationary end circuit (2) of the wireless power supply system and a resonant coil (3) of the wireless power supply system, thereby exciting the receiving end resonant circuit to generate magnetic coupling resonance and generate a high-frequency alternating current. After being conditioned by the rotating end circuit (4) of the wireless power supply system, a DC output is formed to power the heating element of the oscillating heat pipe. The rotating end circuit (4), microcontroller (6), wireless communication module (17) and signal processing module (18) of the wireless power supply system are all installed in a non-metallic housing (8).

3. The rotating oscillating heat pipe heat transfer multi-physics field testing device according to claim 1, characterized in that: The rotating end signal acquisition system is composed of a sensor, a signal processing module (18), a microcontroller (6) and a wireless communication module (17). According to the division of the voltage signal output by the sensor and the analog input range of the microcontroller (6), the parameters of the signal processing module (18) are adjusted according to formula (1): （1） In the formula Gain is the gain of the signal processing module, V i is the recognition accuracy of the microcontroller, V c is the graduation value of the sensor; the compensation of the signal processing module is obtained through calibration according to the test environment and sensor type.

4. The rotating oscillating heat pipe heat transfer multi-physics field testing device according to claim 3, characterized in that: The signal processed by the signal processing module (18) is read into the microcontroller (6). After the microcontroller (6) completes the data conversion through the algorithm, the obtained data is packaged and then the packaged data is transmitted to the wireless communication module through SPI for transmission; the limit sampling frequency of the rotating end signal acquisition system is calculated by formula (2), and the result is fed back to the operation interface of the data acquisition system (14) on the PC side; （2） In the formula, f is the limiting sampling frequency of the signal acquisition system, n is the number of sensors, t d is the single sampling time of the microcontroller, bit is the total number of bytes in the data packet, B is the baud rate.

5. The rotating oscillating heat pipe heat transfer multi-physics field testing device according to claim 4, characterized in that: The data acquisition system (14) at the PC end establishes communication with the signal receiving end circuit (15) through the serial port protocol. The signal receiving end circuit transmits the data packet received from the rotating end signal acquisition system to the data acquisition system at the PC end. The data acquisition system at the PC end decodes the data packet to realize real-time display and storage of sensor information. In addition, in the data acquisition system at the PC end, instructions can be issued to the rotating end signal acquisition system through the wireless communication module in the signal receiving end circuit (15) to set parameters for the sampling frequency, offset value, and data channel.

6. The operating method of the rotating oscillating heat pipe heat transfer multi-physics field testing device according to claim 1, characterized in that: The following steps are involved: Step 1: Prepare an oscillating heat pipe cavity according to the test requirements, use a vacuum pump to evacuate the cavity and inject a working fluid according to a set filling rate, seal the cavity, and make an oscillating heat pipe that meets the test requirements; spray insulating paint on the oscillating heat pipe, wrap a heating wire (19) around the evaporation end, arrange a sensor, wrap the evaporation end (10-1) and the insulation end (10-2) with an insulating material, install the oscillating heat pipe bracket (9), and use screws to tighten the cover plate (12) to fix the oscillating heat pipe; Step 2: Connect the stationary end circuit (2) of the wireless power supply system to the DC power supply (13), connect the output of the rotating end circuit (4) of the wireless power supply system to the heating wire (19) of the rotating oscillating heat pipe, connect the output of the sensor to the rotating end signal acquisition system, connect the signal receiving end circuit (15) to the PC end data acquisition system (14), adjust the dynamic balance through the dynamic balance ring (7), and then connect the spindle adapter (5) to the rotating shaft (1); Step 3: Set the test speed for the rotating shaft (1), start the signal acquisition system and the cold air jet pipeline (16), start the rotating shaft, turn on the DC power supply (13), provide the heating wire of the rotating oscillating heat pipe with power that meets the test requirements, start the data acquisition system (14) on the PC, complete the relevant settings of the sampling frequency, bias value, and data channel in the signal acquisition system, and implement cooling at the condensing end of the oscillating heat pipe; record the information of the oscillating heat pipe, which includes but is not limited to temperature and pressure, and obtain the heat transfer performance of the rotating oscillating heat pipe (10) under the physical and operating parameters through data processing.

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