Method and equipment for measuring phase interface parameters between nuclear reactor fuel assemblies

Abstract

The embodiment of the invention provides a method and equipment for measuring phase interface parameters between nuclear reactor fuel assemblies, and belongs to the technical field of thermal hydraulic analysis of nuclear power plants. The method comprises the steps that cavitation bubbles are generated in the flow channel of the special-shaped structure; images of cavitation bubbles in the flow channel of the special-shaped structure in multiple directions are collected; performing three-dimensional reconstruction according to the images of the cavitation bubble in the multiple directions to obtain the volume of the cavitation bubble; the void fraction is determined according to the volume of the void and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters comprise the volume of the void and the void fraction. According to the embodiment of the invention, the measurement precision of phase interface parameters can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of thermal hydraulic analysis of nuclear power plants, and in particular to a method and device for measuring phase interface parameters between nuclear reactor fuel assemblies. Background Art

[0002] As the nuclear industry's requirements for power, safety, and economy continue to increase, traditional rod-shaped fuel assemblies can no longer meet the industry's demand for performance improvement. At present, various research and development units have gradually shifted their focus to special-shaped fuel rods, such as spiral cross fuel rods, medium-pore fuel rods, etc. Among them, spiral cross fuel rods have the characteristics of large specific surface area and strong self-mixing, which can improve power output while ensuring safety and economy. However, the structure of the special-shaped fuel rod assembly is relatively complex, and the thermal-hydraulic two-phase flow in the channel of the special-shaped fuel rod assembly is also relatively complex. Therefore, it is difficult to obtain the precise values of the relevant parameters of the special-shaped fuel rod assembly, which leads to low measurement accuracy of the phase interface parameters. Summary of the Invention

[0003] The main purpose of the embodiments of the present application is to provide a method and device for measuring phase interface parameters between nuclear reactor fuel assemblies, aiming to improve the measurement accuracy of phase interface parameters.

[0004] To achieve the above objectives, a first aspect of an embodiment of the present application provides a method for measuring phase interface parameters between nuclear reactor fuel assemblies, which is applied to a phase interface parameter measurement device. The phase interface parameter measurement device includes a test section, wherein a special-shaped flow channel is provided in the test section. The special-shaped flow channel is constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water. The special-shaped flow channel is provided with a simulation structure for simulating multiple special-shaped fuel rods. The method includes:

[0005] generating cavitation bubbles in the special-shaped flow channel;

[0006] collecting images of cavitation in the flow channel of the special-shaped structure in multiple directions;

[0007] Performing three-dimensional reconstruction based on images of the cavitation bubble in multiple directions to obtain the volume of the cavitation bubble;

[0008] The cavitation fraction is determined according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters include the volume of the cavitation and the cavitation fraction.

[0009] To achieve the above objectives, a second aspect of an embodiment of the present application provides a phase interface parameter measurement device, comprising a control unit and a test section. The test section is provided with a special-shaped flow channel, the special-shaped flow channel being constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water. The special-shaped flow channel is provided with a simulation structure for simulating multiple special-shaped fuel rods. The control unit is configured to:

[0010] generating cavitation bubbles in the special-shaped flow channel;

[0011] collecting images of cavitation in the flow channel of the special-shaped structure in multiple directions;

[0012] Performing three-dimensional reconstruction based on images of the cavitation bubble in multiple directions to obtain the volume of the cavitation bubble;

[0013] The cavitation fraction is determined according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters include the volume of the cavitation and the cavitation fraction.

[0014] The present application proposes a method and apparatus for measuring interphase interface parameters between nuclear reactor fuel assemblies. This method generates cavitation within a heterogeneous flow channel, then collects images of the cavitation within the heterogeneous flow channel in multiple directions. Three-dimensional reconstruction is then performed based on these images to determine the cavitation volume. The cavitation fraction is then determined based on the cavitation volume and the total volume of the fluid domain within the heterogeneous flow channel, thereby completing the measurement of the interphase interface parameters. By utilizing a heterogeneous flow channel constructed of a polytetrafluoroethylene composite material with the same refractive index as deionized water, these steps enable the collection of clear images of the cavitation within the heterogeneous flow channel. This allows the cavitation volume and fraction to be determined with high accuracy based on these images, improving the measurement accuracy of the interphase interface parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a flow chart of a method for measuring interphase parameters of nuclear reactor fuel assemblies provided in an embodiment of the present application;

[0016] Figure 2 Schematic diagram of the structure of the phase interface parameter measurement device provided in the embodiment of the present application;

[0017] Figure 3 This is a schematic diagram of the hardware structure of the electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0019] It should be noted that although the device schematics illustrate functional module divisions and the flowcharts illustrate logical sequences, in certain circumstances, the steps shown or described may be performed in a sequence that differs from the module divisions in the device or the sequence in the flowcharts. The terms "first," "second," and so on, in the specification, claims, and drawings, are used to distinguish similar items and are not necessarily used to describe a specific sequence or precedence.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0021] To solve the problems of the prior art, the embodiments of the present application provide a method and apparatus for measuring the interfacial parameters of nuclear reactor fuel assemblies, aiming to improve the measurement accuracy of the interfacial parameters of special-shaped fuel rod assemblies.

[0022] The method and device for measuring the interphase parameters of nuclear reactor fuel assemblies provided in the embodiments of the present application are specifically illustrated through the following embodiments. First, the method for measuring the interphase parameters of nuclear reactor fuel assemblies in the embodiments of the present application is described.

[0023] The method for measuring the interphase interface parameters of nuclear reactor fuel assemblies provided in the embodiment of the present application relates to the technical field of thermal hydraulic analysis of nuclear power plants. The method for measuring the interphase interface parameters of nuclear reactor fuel assemblies provided in the embodiment of the present application can be applied to a terminal, can be applied to a server side, or can be software running in a terminal or a server side. In some embodiments, the terminal can be a smart phone, a tablet computer, a laptop computer, a desktop computer, etc.; the server side can be configured as an independent physical server, or as a server cluster or distributed system composed of multiple physical servers, or as a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content distribution networks, and big data and artificial intelligence platforms; the software can be an application that implements the method for measuring the interphase interface parameters of nuclear reactor fuel assemblies, etc., but is not limited to the above forms.

[0024] The present application can be used in many general or special computer system environments or configurations. For example: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, minicomputers, mainframe computers, distributed computing environments including any of the above systems or devices, and the like. The present application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform specific tasks or implement specific abstract data types. The present application can also be practiced in distributed computing environments in which tasks are performed by remote processing devices connected via a communication network. In a distributed computing environment, program modules can be located in local and remote computer storage media, including storage devices.

[0025] Figure 1 This is a flow chart of a method for measuring interphase parameters of nuclear reactor fuel assemblies provided in an embodiment of the present application. Figure 1 As shown, an embodiment of the present application provides a method for measuring phase interface parameters between nuclear reactor fuel assemblies, which is applied to a phase interface parameter measuring device and executed by a control unit in the phase interface parameter measuring device. The phase interface parameter measuring device includes a test section, wherein a special-shaped flow channel is provided in the test section. The special-shaped flow channel is constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water, and a simulation structure for simulating multiple special-shaped fuel rods is provided in the special-shaped flow channel. Figure 1 The method may include but is not limited to steps 101 to 104.

[0026] Step 101, generating cavitation in the special-shaped flow channel;

[0027] Step 102, collecting images of cavitation in the flow channel of the special-shaped structure in multiple directions;

[0028] Step 103, performing three-dimensional reconstruction based on the images of the cavitation bubble in multiple directions to obtain the volume of the cavitation bubble;

[0029] Step 104 : determining a cavitation fraction according to the volume of the cavitation and the total volume of the fluid domain in the flow channel with the special-shaped structure, wherein the phase interface parameters include the volume of the cavitation and the cavitation fraction.

[0030] The phase interface parameter measurement equipment includes a test section with a special-shaped flow channel. The special-shaped flow channel contains a simulation structure for simulating multiple special-shaped fuel rods. The special-shaped fuel rods simulated by the simulation structure can be spiral cross fuel rods, centrally vented fuel rods, or other fuel rods with structures different from traditional fuel rods. The multiple special-shaped fuel rods simulated by the simulation structure are arranged in a specific pattern, for example, a regular hexagonal arrangement. Furthermore, the special-shaped flow channel is constructed of a polytetrafluoroethylene composite material with the same refractive index as deionized water.

[0031] In an embodiment of the present application, the phase interface parameters include the volume and cavitation fraction of the cavitation bubbles. Specifically, based on the above structure, the phase interface parameter measurement device can generate cavitation bubbles in a special-shaped flow channel. In the case where cavitation bubbles exist in the special-shaped flow channel, an image acquisition device, such as a high-speed camera or a computer tomography device, can be used to capture images of the cavitation bubbles in the special-shaped flow channel in multiple directions. Since the polytetrafluoroethylene composite material and deionized water have the same refractive index, based on the special-shaped flow channel constructed using the polytetrafluoroethylene composite material, the image acquisition device can quickly and clearly capture images of the cavitation bubbles in the special-shaped flow channel in multiple directions.

[0032] After collecting images of the cavitation in multiple directions, a three-dimensional reconstruction is performed based on the images of the cavitation in multiple directions using a three-dimensional reconstruction method (for example, stereo vision technology, a deep learning model, or a volume reconstruction method) to obtain the three-dimensional structure of the cavitation, and then the volume of the cavitation is determined based on the three-dimensional structure of the cavitation. Subsequently, the cavitation fraction can be obtained based on the volume of the cavitation and the total volume of the fluid domain in the special-shaped structure flow channel. Among them, the total volume of the fluid domain in the special-shaped structure flow channel can be determined after the special-shaped structure flow channel is constructed. In addition, the volume growth value of the cavitation can be determined by subtracting the volume of the cavitation at the last acquisition moment from the volume of the cavitation, where the last acquisition moment is the moment when the volume of the cavitation was last determined. The volume growth value of the cavitation can be used as a basic parameter for the development of other thermal hydraulic models such as the interphase heat transfer area and flow pattern transition. In this way, accurate measurement of phase interface parameters can be completed.

[0033] In steps 101 to 104, as shown in the embodiment of the present application, cavitation is generated within the heterogeneous flow channel, and images of the cavitation within the heterogeneous flow channel in multiple directions are collected. Three-dimensional reconstruction is then performed based on the images of the cavitation in multiple directions to obtain the volume of the cavitation. The cavitation fraction is then determined based on the volume of the cavitation and the total volume of the fluid domain within the heterogeneous flow channel, thereby completing the measurement of the phase interface parameters. In the above steps, by using a heterogeneous flow channel constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water, clear images of the cavitation within the heterogeneous flow channel can be collected. Thus, based on the images of the cavitation in multiple directions, the volume and cavitation fraction of the cavitation can be determined with high accuracy, thereby improving the measurement accuracy of the phase interface parameters.

[0034] In some embodiments, a cavitation generator is further provided beside the special-shaped flow channel in the test section;

[0035] The generating of cavitation in the special-shaped flow channel comprises:

[0036] injecting deionized water into the test section;

[0037] The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel.

[0038] A cavitation generator is also provided next to the special-shaped flow channel in the test section. The cavitation generator can generate cavitation within the special-shaped flow channel. Specifically, deionized water can be injected into the test section, and then the cavitation generator heats the deionized water in the test section. The cavitation generator also reduces the pressure within the test section, causing the deionized water in the test section to vaporize and generate cavitation within the test section. Subsequently, the cavitation within the test section can flow into the special-shaped flow channel, resulting in the presence of cavitation within the special-shaped flow channel. In this way, cavitation can be generated within the special-shaped flow channel, facilitating the subsequent measurement of phase interface parameters.

[0039] In some embodiments, the test section is placed vertically, and the phase interface parameter measurement device further includes a magnetic suction pump disposed at the bottom of the test section;

[0040] The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel, comprising:

[0041] The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the test section;

[0042] The magnetic suction pump is started to drive the cavitation bubbles in the test section into the special-shaped flow channel.

[0043] The deionized water in the test section can be vaporized by the cavitation generator, thereby generating cavitations in the flow channel of the special structure. Specifically, the deionized water in the test section is heated by the cavitation generator, and the pressure in the test section is reduced by the cavitation generator, so that the deionized water in the test section is vaporized and cavitations are generated in the test section. Since the test section is placed vertically, by starting the magnetic suction pump provided at the bottom of the test section, a flow from bottom to top can be formed in the test section, and the cavitations in the test section flow upward into the flow channel of the special structure. The impeller is driven to rotate by the magnetic transmission of the magnetic suction pump, and there is no need to establish a pressurized flow circuit in the phase interface parameter measurement equipment, so that the measurement of cavitation changes under medium and high pressure flow conditions can be achieved, thereby avoiding the motor shaft passing through the test section and reducing the experimental cost and difficulty.

[0044] In some embodiments, the test section is placed vertically, and the cavitation generator includes an electric heating rod and a pressure adjustment unit, and the pressure adjustment unit is connected to the top of the test section through an air pipeline;

[0045] The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel, comprising:

[0046] The deionized water is heated by the electric heating rod, and the pressure in the test section is adjusted by the pressure adjustment unit, so that the deionized water is vaporized and cavitation is generated in the special-shaped flow channel.

[0047] The cavitation generator can be used to vaporize the deionized water in the test section, thereby generating cavitations in the special-shaped flow channel. Specifically, the cavitation generator includes an electric heating rod and a pressure adjustment unit, and the pressure adjustment unit is connected to the top of the test section through an air pipeline. After starting the electric heating rod, the deionized water can be heated by the electric heating rod so that the deionized water is close to a saturated state. Then, the steam at the top of the test section can be discharged through the pressure adjustment unit, so that the deionized water reaches a saturated state. At the same time, the pressure in the test section is reduced to reach the saturation pressure. At this time, cavitations are generated in the test section. Subsequently, the cavitations in the test section flow into the special-shaped flow channel, causing cavitations to exist in the special-shaped flow channel.

[0048] In some embodiments, the pressure adjustment unit includes a vacuum pump and a quick-opening valve, the vacuum pump is connected to the top of the test section through the gas pipeline, and the quick-opening valve is provided on the gas pipeline;

[0049] Adjusting the pressure in the test section by the pressure adjustment unit includes:

[0050] The quick-opening valve is controlled to open, and the pressure in the test section is adjusted by the vacuum pump.

[0051] The pressure adjustment unit includes a vacuum pump and a quick-opening valve. The vacuum pump is connected to the top of the test section via an air pipeline, and the quick-opening valve is installed on the air pipeline. The pressure adjustment unit can be used to adjust the pressure within the test section. Specifically, after the quick-opening valve is controlled to open, the vacuum pump can be used to extract steam from the test section, thereby reducing the pressure within the test section to the saturation pressure, thereby adjusting the pressure within the test section. Through the above steps, the pressure within the test section can be adjusted to enable cavitation to form within the test section.

[0052] In some embodiments, the phase interface parameter measurement device further comprises a plurality of high-speed cameras;

[0053] The collecting of images of cavitation in the flow channel of the special-shaped structure in multiple directions includes:

[0054] The images of the cavitation in the special-shaped flow channel in multiple directions are collected by a plurality of high-speed cameras.

[0055] A high-speed camera is a device used to capture rapid events, capable of capturing video at extremely high frame rates. This capability allows for multiple cameras to be deployed, each positioned in a different direction. This allows for the acquisition of images of cavitation bubbles in a flow channel with a unique structure from multiple directions, enabling non-invasive measurement of cavitation morphology.

[0056] In some embodiments, determining the cavitation fraction according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel includes:

[0057] The ratio of the volume of the cavitation bubble to the total volume of the fluid domain in the special-shaped structure flow channel is taken as the cavitation fraction.

[0058] The cavitation fraction can be determined based on the volume of the cavitation bubble and the total volume of the fluid domain within the irregularly shaped flow channel. Specifically, the ratio of the cavitation bubble volume to the total volume of the fluid domain within the irregularly shaped flow channel can be determined and used as the cavitation fraction. This yields the cavitation fraction, which can then be used as a fundamental parameter for developing other thermal-hydraulic models, such as those for interphase heat transfer area and flow pattern transition.

[0059] In some embodiments, a cooling coil is further provided beside the special-shaped flow channel in the test section;

[0060] After determining the cavitation fraction based on the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel, the method further includes:

[0061] The cooling coil is controlled to open to reduce the pressure in the test section.

[0062] Cavitation condensation can be achieved using a cooling coil installed in the test section. The cooling coil is located adjacent to the irregularly shaped flow channel. Specifically, after determining the cavitation fraction based on the volume of the cavitation and the total volume of the fluid domain within the irregularly shaped flow channel, the cooling coil can be controlled to open, reducing the pressure within the test section to below the saturation pressure, causing the cavitation to disappear and concluding the phase interface parameter measurement process.

[0063] In some embodiments, the phase interface parameter measurement device further comprises an air pressure tank, and the air pressure tank is connected to the test section via an exhaust valve;

[0064] After determining the cavitation fraction based on the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel, the method further includes:

[0065] The exhaust valve is controlled to open so as to reduce the pressure in the test section through the air pressure tank.

[0066] The phase interface parameter measurement equipment also includes a pressure tank connected to the test section via an exhaust valve. This pressure tank allows for cavitation condensation. Specifically, after determining the cavitation fraction based on the volume of the cavitation bubbles and the total volume of the fluid domain within the irregularly shaped flow channel, the exhaust valve is controlled to open, allowing gas within the test section to enter the pressure tank. This reduces the pressure within the test section to below the saturation pressure, causing the cavitation bubbles to disappear, and concluding the phase interface parameter measurement process.

[0067] In addition, the cooling coil and the exhaust valve can be opened at the same time, thereby reducing the pressure in the test section through the cooling coil and the air pressure tank at the same time, thereby accelerating the disappearance of cavitation.

[0068] Figure 2 This is a schematic diagram of the structure of the phase interface parameter measurement device provided in the embodiment of the present application. Figure 2 The phase interface parameter measurement equipment includes a vacuum pump (not shown), an air pressure tank 1, a test section 2, a quick-opening valve 3, a magnetic suction pump 4, an electric heating rod 5, a cooling coil 6, a high-speed camera 7, and a control unit 8. Specifically, a special-shaped flow channel 9 constructed of a polytetrafluoroethylene composite material with the same refractive index as deionized water is provided in the test section 2.

[0069] Based on the structure of the above-mentioned phase interface parameter measurement device, the method for measuring the phase interface parameters between nuclear reactor fuel assemblies provided in the embodiment of the present application will be illustrated below.

[0070] Step 1: inject deionized water into the test section and start the electric heating rod to heat the deionized water in the test section to a near saturated state;

[0071] Step 2: Open the quick-opening valve at the top of the test section to exhaust the steam at the top of the test section, so that the deionized water in the test section reaches saturation. In addition, as the pressure in the test section decreases, the test section reaches saturation pressure, and cavitation begins to form in the test section. At this time, start the magnetic suction pump at the bottom of the test section to form an upward flow in the test section, driving the cavitation to flow upward through the special-shaped flow channel;

[0072] Step 3, photographing the cavitations in the flow channel of the special-shaped structure by a high-speed camera. Since the flow channel of the special-shaped structure has the same refractive index as deionized water, the high-speed camera can clearly capture the movement of the cavitations. In this way, by using multiple high-speed cameras to shoot at multiple angles, images of the cavitations at different angles (i.e., images of the cavitations in multiple directions) are obtained, and the three-dimensional structure of the cavitations is formed by a computer three-dimensional reconstruction method, and then the volume of the cavitations is obtained based on the three-dimensional structure of the cavitations. Subsequently, the ratio of the volume of the cavitations to the total volume of the fluid domain in the flow channel of the special-shaped structure can be used as the cavitation fraction. Moreover, the volume growth value of the cavitations can be determined based on the volume of the cavitations at different acquisition moments. In this way, the cavitation fraction and the volume growth value of the cavitations can be used as basic parameters for the development of other thermal hydraulic models such as interphase heat transfer area and flow pattern transition;

[0073] Step 4: Enable the air pressure tank and turn on the cooling coil to reduce the pressure in the test section to below the saturation pressure, and the cavitation will gradually disappear.

[0074] The method for measuring the interphase parameters of nuclear reactor fuel assemblies provided in this application utilizes a material having the same refractive index as deionized water to construct a special-shaped flow channel, allowing a high-speed camera to directly and clearly capture the flow state of cavitation. This avoids the difficulty that commonly used intrusive measurement methods such as wire mesh measurement, probe measurement, and electrical impedance measurement in the prior art cannot be deployed in special-shaped flow channels or cannot create conditions for studying interphase heat exchange, thereby improving the measurement accuracy of interphase parameters. Furthermore, through a magnetic suction pump, the impeller can be driven by magnetic transmission to rotate, eliminating the need to establish a pressurized flow circuit in the interphase parameter measurement equipment, and can achieve measurement of cavitation changes under medium and high pressure flow conditions, reducing experimental cost and difficulty.

[0075] The present application also provides an interface parameter measurement device, comprising a control unit and a test section. The test section is provided with a special-shaped flow channel, the special-shaped flow channel being constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water. The special-shaped flow channel is provided with a simulation structure for simulating a plurality of special-shaped fuel rods. The control unit is configured to:

[0076] generating cavitation bubbles in the special-shaped flow channel;

[0077] collecting images of cavitation in the flow channel of the special-shaped structure in multiple directions;

[0078] Performing three-dimensional reconstruction based on images of the cavitation bubble in multiple directions to obtain the volume of the cavitation bubble;

[0079] The cavitation fraction is determined according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters include the volume of the cavitation and the cavitation fraction.

[0080] In some embodiments, when the control unit is used to generate cavitation in the special-shaped flow channel, it specifically performs:

[0081] injecting deionized water into the test section;

[0082] The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel.

[0083] In some embodiments, when the control unit is used to generate cavitation in the special-shaped flow channel, it specifically performs:

[0084] The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the test section;

[0085] The magnetic suction pump is started to drive the cavitation bubbles in the test section into the special-shaped flow channel.

[0086] In some embodiments, when the control unit is used to generate cavitation in the special-shaped flow channel, it specifically performs:

[0087] The deionized water is heated by the electric heating rod, and the pressure in the test section is adjusted by the pressure adjustment unit, so that the deionized water is vaporized and cavitation is generated in the special-shaped flow channel.

[0088] In some embodiments, when the control unit is used to generate cavitation in the special-shaped flow channel, it specifically performs:

[0089] The quick-opening valve is controlled to open, and the pressure in the test section is adjusted by the vacuum pump.

[0090] In some embodiments, the control unit is further configured to:

[0091] The cooling coil is controlled to open to reduce the pressure in the test section.

[0092] In some embodiments, the control unit is further configured to:

[0093] The exhaust valve is controlled to open so as to reduce the pressure in the test section through the air pressure tank.

[0094] In some embodiments, when determining the cavitation fraction based on the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel, the control unit specifically performs:

[0095] The ratio of the volume of the cavitation bubble to the total volume of the fluid domain in the special-shaped structure flow channel is taken as the cavitation fraction.

[0096] In some embodiments, when the control unit is used to collect images of cavitation in the flow channel of the special-shaped structure in multiple directions, it specifically performs:

[0097] The images of the cavitation in the special-shaped flow channel in multiple directions are collected by a plurality of high-speed cameras.

[0098] The specific implementation of the control unit can be found in the specific embodiment of the method for measuring parameters of the phase interface between nuclear reactor fuel assemblies, which will not be described in detail here.

[0099] The present application also provides an electronic device comprising a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the aforementioned method for measuring interphase parameters between nuclear reactor fuel assemblies. The electronic device can be any smart terminal, including a tablet computer and an in-vehicle computer.

[0100] Figure 3 Schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. Figure 3 As shown, the electronic equipment includes:

[0101] The processor 301 may be implemented using a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is configured to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0102] The memory 302 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 302 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 302 and is called by the processor 301 to execute the method for measuring the interphase parameters of nuclear reactor fuel assemblies in the embodiments of this application.

[0103] Input / output interface 303, used to implement information input and output;

[0104] Communication interface 304, used to implement communication interaction between this device and other devices, which can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, Wi-Fi, Bluetooth, etc.);

[0105] bus 305 , which transmits information between the various components of the device (e.g., processor 301 , memory 302 , input / output interface 303 , and communication interface 304 );

[0106] The processor 301 , the memory 302 , the input / output interface 303 and the communication interface 304 are connected to each other in communication within the device via the bus 305 .

[0107] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the above-mentioned method for measuring phase interface parameters between nuclear reactor fuel assemblies.

[0108] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0109] The present application proposes a method and apparatus for measuring interphase interface parameters between nuclear reactor fuel assemblies. This method generates cavitation within a heterogeneous flow channel, then collects images of the cavitation within the heterogeneous flow channel in multiple directions. Three-dimensional reconstruction is then performed based on these images to determine the cavitation volume. The cavitation fraction is then determined based on the cavitation volume and the total volume of the fluid domain within the heterogeneous flow channel, thereby completing the measurement of the interphase interface parameters. By utilizing a heterogeneous flow channel constructed of a polytetrafluoroethylene composite material with the same refractive index as deionized water, these steps enable the collection of clear images of the cavitation within the heterogeneous flow channel. This allows the cavitation volume and fraction to be determined with high accuracy based on these images, improving the measurement accuracy of the interphase interface parameters.

[0110] The embodiments described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will appreciate that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0111] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of the present application, and may include more or fewer steps than shown in the figures, or a combination of certain steps, or different steps.

[0112] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0113] Those skilled in the art will appreciate that all or some of the steps in the methods, systems, and functional modules / units in the devices disclosed above may be implemented as software, firmware, hardware, or appropriate combinations thereof.

[0114] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0115] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0117] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0118] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0119] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including multiple instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store programs.

[0120] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A method for measuring interphase parameters of nuclear reactor fuel assemblies, characterized in that: The method is applied to a phase interface parameter measurement device, the phase interface parameter measurement device including a test section, the test section being provided with a special-shaped flow channel, the special-shaped flow channel being constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water, the special-shaped flow channel being provided with a simulation structure for simulating a plurality of special-shaped fuel rods, and the method comprising: generating cavitation bubbles in the special-shaped flow channel; collecting images of cavitation in the flow channel of the special-shaped structure in multiple directions; Performing three-dimensional reconstruction based on images of the cavitation bubble in multiple directions to obtain the volume of the cavitation bubble; The cavitation fraction is determined according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters include the volume of the cavitation and the cavitation fraction.

2. The method according to claim 1, characterized in that A cavitation generator is also provided beside the special-shaped flow channel in the test section; The generating of cavitation in the special-shaped flow channel comprises: injecting deionized water into the test section; The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel.

3. The method according to claim 2, characterized in that The test section is placed vertically, and the phase interface parameter measurement device further includes a magnetic suction pump arranged at the bottom of the test section; The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel, comprising: The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the test section; The magnetic suction pump is started to drive the cavitation bubbles in the test section into the special-shaped flow channel.

4. The method according to claim 2, characterized in that The test section is placed vertically, and the cavitation generator includes an electric heating rod and a pressure adjustment unit, and the pressure adjustment unit is connected to the top of the test section through an air pipeline; The deionized water in the test section is vaporized by the cavitation generator to generate cavitation in the special-shaped flow channel, comprising: The deionized water is heated by the electric heating rod, and the pressure in the test section is adjusted by the pressure adjustment unit, so that the deionized water is vaporized and cavitation is generated in the special-shaped flow channel.

5. The method according to claim 4, characterized in that The pressure adjustment unit includes a vacuum pump and a quick-opening valve, the vacuum pump is connected to the top of the test section through the gas pipeline, and the quick-opening valve is arranged on the gas pipeline; Adjusting the pressure in the test section by the pressure adjustment unit includes: The quick-opening valve is controlled to open, and the pressure in the test section is adjusted by the vacuum pump.

6. The method according to claim 1, characterized in that A cooling coil is also provided beside the special-shaped flow channel in the test section; After determining the cavitation fraction based on the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel, the method further includes: The cooling coil is controlled to open to reduce the pressure in the test section.

7. The method according to claim 1, characterized in that The phase interface parameter measuring device further comprises an air pressure tank, which is connected to the test section via an exhaust valve; After determining the cavitation fraction based on the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel, the method further includes: The exhaust valve is controlled to open so as to reduce the pressure in the test section through the air pressure tank.

8. The method according to claim 1, characterized in that The determining of the cavitation fraction according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped flow channel includes: The ratio of the volume of the cavitation bubble to the total volume of the fluid domain in the special-shaped structure flow channel is taken as the cavitation fraction.

9. The method according to claim 1, characterized in that The phase interface parameter measurement equipment also includes a plurality of high-speed cameras; The collecting of images of cavitation in the flow channel of the special-shaped structure in multiple directions includes: The images of the cavitation in the special-shaped flow channel in multiple directions are collected by a plurality of high-speed cameras.

10. A phase interface parameter measuring device, characterized in that: The phase interface parameter measurement device includes a control unit and a test section. The test section is provided with a special-shaped flow channel. The special-shaped flow channel is constructed of a polytetrafluoroethylene composite material having the same refractive index as deionized water. The special-shaped flow channel is provided with a simulation structure for simulating multiple special-shaped fuel rods. The control unit is used to: generating cavitation bubbles in the special-shaped flow channel; collecting images of cavitation in the flow channel of the special-shaped structure in multiple directions; Performing three-dimensional reconstruction based on images of the cavitation bubble in multiple directions to obtain the volume of the cavitation bubble; The cavitation fraction is determined according to the volume of the cavitation and the total volume of the fluid domain in the special-shaped structure flow channel, and the phase interface parameters include the volume of the cavitation and the cavitation fraction.

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