CN113075549A - Visual measuring device and method thereof - Google Patents
Visual measuring device and method thereof Download PDFInfo
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- CN113075549A CN113075549A CN202110290492.2A CN202110290492A CN113075549A CN 113075549 A CN113075549 A CN 113075549A CN 202110290492 A CN202110290492 A CN 202110290492A CN 113075549 A CN113075549 A CN 113075549A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The application relates to a visual measuring device, which comprises an assembly body, a fluid circuit and a control system. The assembly body comprises a polar plate, a first side plate, a second side plate and a heating assembly, the first side plate and the second side plate are respectively positioned on two sides of the polar plate to form a closed flow field in a surrounding mode, and the heating assembly is arranged between the polar plate and the second side plate; the fluid loop comprises a driving pump and a temperature sensor, the driving pump is respectively connected with the liquid inlet part and the liquid outlet part, and the temperature sensor is used for detecting the temperature of the fluid; the control system comprises a power supply and a monitoring module power supply which are electrically connected with the heating assembly, the power supply and the monitoring module power supply can drive the heating assembly to heat, and the monitoring module can monitor the resistance and the temperature of the heating assembly. The visual measuring device controls the temperature of the heating assembly through the power supply, and controls the superheat degree of the whole fluid circuit and enables the size of boiling bubbles generated on the surface of the heating assembly to be smaller than the cross-sectional size of the flow channel by utilizing the principle that the boiling bubbles are smaller as the superheat degree is larger, so that the flowing state of the fluid in the flow channel is reflected more truly.
Description
Technical Field
The application relates to the technical field of fuel cells, in particular to a visual measuring device and a method thereof.
Background
With the development of cell technology, proton exchange membrane fuel cells have emerged, which adsorb hydrogen and oxygen through an air electrode and convert them into an ionic state using a catalyst, generating water in an electrolyte solution while releasing energy. In the fuel cell, the structure of the bipolar plate directly affects the flow field of gas and liquid, thereby affecting the performance of the fuel cell, and the design of the flow field structure can be researched by a visualization method.
The visualization device of the fuel cell bipolar plate in the prior art mainly comprises a visualization device formed by a transparent glass plate and the bipolar plate, and the flowing and distribution state of gas-liquid mixed fluid on the bipolar plate is observed through the transparent bipolar plate or the transparent glass plate.
However, in practice, firstly the volume of gas decreases with increasing liquid flow rate, and secondly the gas bubbles dissipate or coalesce during flow, thus requiring the device to be close enough to the flow channel to prevent collapse or coalescence of the gas bubbles. Finally, for a multi-channel bipolar plate, when the gas-liquid two-phase flow formed in the main flow channel is actually distributed in a flowing manner, the bubbles form plugs in the distribution area, so that the flow field is blocked or changed, and the obtained flow field cannot reflect the real condition.
Disclosure of Invention
In view of this, it is necessary to provide a visual measurement apparatus and a method thereof for solving the problem that a flow field simulated by a multi-channel plate is easy to form embolism.
A visual measuring device comprises an assembly body, a fluid circuit and a control system. The assembly body comprises a polar plate, a first side plate, a second side plate and a heating assembly, the first side plate and the second side plate are respectively positioned on two sides of the polar plate to form a closed flow field in a surrounding manner, the first side plate is made of transparent materials and is provided with a liquid inlet piece and a liquid outlet piece, and the heating assembly is arranged between the polar plate and the second side plate; the fluid loop comprises a driving pump and a temperature sensor, the driving pump is respectively connected with the liquid inlet part and the liquid outlet part through a fluid pipeline, and the temperature sensor is arranged on the pipeline to detect the temperature of the fluid; the control system comprises a power supply and a monitoring module, wherein the power supply and the monitoring module are electrically connected to the heating assembly, the power supply can drive the heating assembly to generate heat, and the monitoring module can monitor the resistance and the temperature of the heating assembly.
The visual measuring device controls the temperature of the heating assembly through the power supply, and controls the superheat degree of the whole fluid circuit and enables the size of boiling bubbles generated on the surface of the heating assembly to be smaller than the cross-sectional size of the flow channel by utilizing the principle that the boiling bubbles are smaller as the superheat degree is larger, so that the flowing state of the fluid in the flow channel is reflected more truly.
In one embodiment, the fluid circuit further comprises a flow meter and a regulating valve, and the flow meter and the regulating valve are both arranged on the fluid pipeline.
In one embodiment, the visual measuring device further comprises a pressure control assembly comprising a water tank, a gas cylinder and a pressure reducing valve, the gas cylinder being connected to the water tank via the pressure reducing valve, the water tank being in communication with the fluid conduit to control the system pressure of the fluid circuit.
In one embodiment, the heating assembly includes a thermocouple and electrodes disposed at two ends of the thermocouple, the electrodes penetrate through the second side plate and are partially exposed out of the second side plate, and the power supply and the detection module are electrically connected to the heating assembly through hydrophobic electrodes.
In one embodiment, the polar plate is provided with a plurality of flow channels, and the flow channels are communicated with the liquid inlet part and the liquid outlet part.
In one embodiment, the number of the liquid inlet piece and the liquid outlet piece is at least three, and the liquid inlet piece and the liquid outlet piece are respectively used for liquid circulation, air circulation and hydrogen circulation.
A visual measurement method, comprising the steps of: measuring the initial resistance and the resistance temperature coefficient of the heating assembly, starting an image pickup device to shoot the fluid in the flow channel, adjusting the output voltage of the power supply to enable tiny bubbles to intermittently appear on the surface of the heating assembly, and analyzing the moving track and the moving speed of the bubbles in the flow channel.
In one embodiment, the adjusting the output voltage of the power supply to intermittently generate the micro-bubbles on the surface of the heating element specifically comprises: adjusting a system pressure of the flow-through loop to adjust a saturation temperature of the fluid and determine an initial boiling point parameter and a critical heat flux density, calculating a surface heating rate of the heating assembly and adjusting a voltage such that the surface heating rate is greater than the initial boiling point parameter and less than the critical heat flux density.
In one embodiment, adjusting the output voltage of the power supply to intermittently generate the microbubbles on the surface of the heating element further includes: adjusting a system pressure of the circulation loop to adjust a saturation temperature of the fluid and determine a starting point superheat, calculating a superheat of the circulation loop and adjusting the voltage such that the superheat is greater than the starting point superheat.
Drawings
Fig. 1 is a schematic structural diagram of a visual measuring device according to an embodiment of the present application;
FIG. 2 is an exploded view of the structure of an assembly according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a plate structure according to an embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a visual measurement method according to an embodiment of the present application;
fig. 5 is a boiling curve of saturated water at standard atmospheric pressure.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a visual measuring device in an embodiment of the present application.
The visual measuring device provided by an embodiment of the present application includes an assembly body 10, a fluid circuit 20, and a control system 30. Fitting body 10 is coupled to fluid circuit 20 such that fluid, after passing into fitting body 10, is able to circulate throughout fluid circuit 20, and control system 30 is coupled to fitting body 10 and is able to monitor and control a portion of a fluid parameter in fitting body 10 and fluid circuit 20.
Referring to fig. 2 and 3 in combination, fig. 2 is an exploded view of an assembly 10 according to an embodiment of the present disclosure, and fig. 3 is a schematic structural diagram of a plate 100 according to an embodiment of the present disclosure.
The assembly 10 includes a plate 100, a first side plate 110, a second side plate 120, and a heating assembly 130. Specifically, the plate 100 includes an active region 101 and an inactive region 102, wherein the active region 101 is disposed on the plate 100, and the inactive region 102 is disposed around the active region 101. The non-active region 102 is provided with a plurality of through holes 1020 for introducing and discharging fluid, specifically in this embodiment, the through holes 1020 include a first air inlet through hole 1021, a second air inlet through hole 1022, an air inlet through hole 1023, a first air outlet through hole 1024, a second air outlet through hole 1025, and a liquid outlet through hole 1026, wherein the first air inlet through hole 1021 and the first air outlet through hole 1024 are used for communicating with hydrogen, the second air inlet through hole 1022 and the second air outlet through hole 1025 are used for communicating with oxygen or air, and the air inlet through hole 1023 and the liquid outlet through hole 1026 are used for communicating with water in the fluid circuit 20. The periphery of the through hole 1020 is provided with a sealing rubber strip to prevent liquid or gas from overflowing from the through hole 1020. The non-activation region 102 is further provided with a plurality of positioning pin holes for matching with corresponding positioning pins to realize the combined assembly of the plate 100 with the first side plate 110 and the second side plate 120.
The activation region 101 is provided with a flow channel 1010 formed by communicating a plurality of grooves, the first air inlet through hole 1021, the second air inlet through hole 1022, the liquid inlet through hole 1023, the first air outlet through hole 1024, the second air outlet through hole 1025 and the liquid outlet through hole 1026 are respectively communicated with the flow channel 1010, hydrogen, oxygen and water entering the activation region 101 from the first air inlet through hole 1021, the second air inlet through hole 1022 and the liquid inlet through hole 1025 are mixed according to a track preset by the flow channel 1010 to form a flow field and flow out from the liquid outlet through hole 1026, and the rest hydrogen and oxygen respectively flow out from the first air outlet through hole 1024 and the second air outlet through hole 1025. The structure of the flow channels 1010 can affect the distribution of the flow field, and the distribution of the fluid in the flow field can determine various reaction efficiencies and drainage performances of the plate 100, thereby affecting the operation performance and stability of the fuel cell.
The first side plate 110 is fixedly connected with the pole plate 100 through the matching of the positioning pins and the positioning pin holes. The first side plate 110 is made of a transparent material to facilitate an experimenter to observe and analyze the flow state of the fluid in the flow channel 1010 of the plate 100.
Fitting body 10 also includes a flow-through member 140. Specifically, the circulation member 140 is disposed on a side of the first side plate 110 facing away from the plate 100. Specifically, in the present embodiment, the flow element includes a first air inlet 141, a second air inlet 142, an air inlet 143, a first air outlet 144, a second air outlet 145, and a liquid outlet 1116, which correspond to the first air inlet 1021, the second air inlet 1022, the liquid inlet 1023, the first air outlet 1024, the second air outlet 1025, and the liquid outlet 1026 of the non-activation region 102, respectively, and the flow element 140 is communicated with the fluid circuit 20, so that external hydrogen, oxygen, or water can enter the plate 100 and be discharged from the plate 100.
The second side plate 120 is disposed on a side of the plate 100 away from the first side plate 110. Specifically, the edges of the second side plate 120 and the first side plate 110 are provided with assembling screw holes, and the first side plate 110 and the second side plate 120 are connected by bolts and enclose the outline of the assembly 10, so as to increase the stability of the assembly 10. The plates 100 are disposed within the assembly 10 to prevent fluid from escaping from the plates 100.
The heating element 130 is disposed between the plate 100 and the second side plate 120. Specifically, the heating assembly 130 includes a thermocouple 131 and an electrode 132, a through slot is formed on the second side plate 120, the thermocouple 131 is installed in the through slot, the electrode 132 is disposed on the thermocouple 131 and electrically connected to a power supply, the thermocouple 131 can convert electric energy into heat energy to generate heat after being powered on, and the fluid in the flow channel 1010 is heated by the thermocouple 131 and boiled to generate bubbles, so as to simulate a flow state of a mixture of a gas phase and a liquid phase in the flow channel 1010. In the embodiment, the thermocouple 131 is a metal rod made of high-purity metal, such as copper, silver, platinum, and the like. The two ends of the thermocouple 131 are respectively provided with an electrode 132, one end of the electrode 132 is connected with the thermocouple 131, and the other end of the electrode 132 passes through the through slot on the second side plate 120 to be connected to the control system 30, so that the control system 30 can provide electric energy for the thermocouple 131 and monitor the resistance and the temperature of the thermocouple 131.
Referring again to fig. 1, fluid circuit 20 includes a drive pump 210 and a fluid conduit 200, wherein drive pump 210 is connected to fluid circuit 20 via fluid conduit 200, and fitting body 10 is connected to fluid circuit 20 via fluid conduit 200. Specifically, the fluid pipeline 200 is connected to the liquid inlet and the liquid outlet of the assembly 10, and the driving pump 210 is used for pressurizing the water flow in the fluid circuit 20 and pumping the pressurized water flow into the fluid circuit 20 to provide the motive force for the fluid to flow in the flow field.
The fluid circuit 20 further includes a flow meter 220, the flow meter 220 being disposed in the fluid circuit 20. Since the operation of the motor driving the pump 210 has fluctuation and the adjustment accuracy is low, in order to keep the flow rate in the flow field stable, the flow meter 220 is disposed at the inlet end of the driving pump 210 to monitor the flow rate of the fluid in the fluid circuit 20. In the present embodiment, both ends of the flow meter 220 are connected to the fluid pipe 200 and disposed adjacent to the driving pump 210.
The fluid circuit 20 also includes a regulator valve 230. Specifically, the regulating valve 230 is disposed in the fluid circuit 20 adjacent to the flow meter 220, and the regulating valve 230 can regulate the flow rate of the fluid in the fluid circuit 20 by regulating the degree to which the regulating valve 230 is opened and closed. Through the arrangement and the cooperation of the flow meter 220 and the regulating valve 230, the flow of the fluid in the fluid circuit 20 can be stabilized, and the distribution of the flow field under different flow conditions can be simulated by controlling the flow.
The fluid circuit 20 also includes a control valve 240. Specifically, the control valve 240 is disposed in the fluid circuit 20 through the fluid conduit 200 and is capable of controlled communication with or blocking of the fluid circuit 20. Specifically, in the present embodiment, the control valve 240 and the adjustment valve 230 are both three-way valves, and a fluid pipeline 200 is disposed between the control valve 240 and the adjustment valve 230 to directly communicate the control valve 240 and the adjustment valve 230. When it is desired to block fluid circuit 20, the three-way valve of control valve 240 and regulating valve 230 is rotated such that fluid flows through fluid conduit 200 between control valve 240 and regulating valve 230 and cannot enter fluid conduit 200 to which fitting body 10 is connected. Thereby causing the fluid within the plate 100 to lose its driving force and stop flowing.
The fluid circuit 20 also includes a pressure control assembly 250. Specifically, the pressure control assembly 250 includes a water tank 251, a gas cylinder 253, and a pressure relief valve 252, the pressure control assembly 250 being connected to the fluid circuit 20 by the fluid conduit 200. In the embodiment, the water tank 251 is a closed structure, and the water level in the water tank 251 is at a half position, so that the experimenter can conveniently adjust the water level. One end of the water tank 251 is connected to the inlet end of the driving pump 210 through the fluid pipe 200, and the other end of the water tank 251 is connected to the gas cylinder 253 through the pressure reducing valve 252. The experimenter can control the pressure of the water tank 251 through the pressure relief valve 252 to control the fluid pressure in the fluid circuit 20.
The control system 30 includes a power supply 310, a monitoring module 320. Specifically, the power supply 310 and the monitoring module 320 are connected to the electrodes 132 of the heating assembly 130 by wires. The power supply 310 is used for transmitting electric energy to the thermocouple 131 through a lead wire, so that the thermocouple 131 does work and generates heat. The monitoring module 320 is used to detect the real-time resistance and temperature of the heating assembly 130. Specifically, in the embodiment, the power supply 310 is an adjustable dc power supply 310 and the power is much larger than the power of the detection module.
The power source 310, the monitoring module 320 and the temperature sensor 330 can be communicatively connected to a personal computer to transmit the monitoring data of the heating assembly 130 and the fluid to the personal computer, and analyze the data of the fluid and control the flow state of the fluid through a computer program. In the embodiment, the power source 310, the monitoring module 320, the temperature sensor 330 and the personal computer are connected by data transmission wires or wirelessly.
Referring to fig. 4, fig. 4 is a schematic flow chart of a visual measurement method according to an embodiment of the present application. The application provides a visual measurement method, which comprises the following steps:
s10: the resistance and temperature coefficient of resistance of the heating assembly 130 are measured. Specifically, before the measurement is started, the heating assembly 130 is first placed in a constant temperature water bath, and the resistance and the temperature can be approximated by the formula R ═ R in a certain temperature range0(1+aTa+Ta 2) And (4) calculating. Wherein R is the real-time resistance of the heating element 130, R0For the heating element 130 resistance at 0K, both a and b are temperature coefficients of resistance. By measuring two different sets of temperatures and corresponding real-time resistances, a constant R can be calculated0A and b. Based on the constants determined, a formula can be used for the visualization of the measurement
The temperature of the heating element 130 is derived.
S20: the image pickup apparatus is turned on to photograph the fluid in the flow passage 1010. Specifically, the image pickup apparatus is mounted on the transparent first side plate 110 to continuously photograph the fluid flow state in the flow channel 1010.
S30: the output voltage of the power source 310 is adjusted to intermittently generate micro-bubbles on the surface of the heating member 130. The method specifically comprises the following steps:
s310: the system pressure of the fluid circuit 20 is adjusted to adjust the saturation temperature of the fluid and determine an onset boiling point parameter and a critical heat flux density, and the surface heat generation rate of the heating assembly 130 is calculated and the voltage is adjusted such that the surface heat generation rate is greater than the onset boiling point parameter and less than the critical heat flux density. Specifically, referring to fig. 5, fig. 5 is a boiling curve diagram of saturated water at normal atmospheric pressure. The flow rate in the fluid circuit 20 is first adjusted to a target flow rate by the adjustment valve 230 and the flow meter 220, the fluid pressure in the fluid circuit 20 is then adjusted to a target pressure by the pressure reducing valve 252, and the corresponding fluid saturation temperature T can be determined from the pressure by referring to a parameter table of the corresponding fluidsatAnd looking up the boiling curve of the corresponding fluid according to the target pressure to obtain the initial point superheat degree delta toh iniInitial boiling point parameter qcAnd critical heat flux density qmax。
S320: the surface heat generation rate of the heating element 130 is calculated and the voltage of the power supply 310 is adjusted such that the surface heat generation rate is greater than the starting point boiling point parameter and less than the critical heat flux density. Specifically, the calculation formula of the surface heat generation rate is
Wherein q (t) is the surface heating rate of the heating element 130, V is the volume of the heating element 130, S is the surface area of the heating element 130, ρ is the density of the heating element 130, c is the specific heat of the heating element 130, and Q (t) is the heating power of the heating element 130, the heating power of the heating element 130 can be represented by the formula
Calculated, where R can be obtained by the monitoring module 320 directly measuring the heating assembly 130.
By gradually increasing the voltage U of the power supply 310, heating is performedThe surface of the heating assembly 130 begins to boil, which may cause local overheating of the surface of the heating assembly 130 and thus unstable resistance R, and therefore the voltage U of the power source 310 needs to be continuously adjusted so that the surface heating rate of the heating assembly 130 is at the initial boiling point parameter qcAnd critical heat flux density qmaxSo that bubbles generated on the surface of the heating element 130 are in a nucleate boiling state, i.e., the generated boiling bubbles have a small size.
S330: the superheat of the fluid circuit 20 is calculated and the voltage is adjusted so that the superheat is greater than the starting point superheat. Specifically, the degree of superheat can be represented by the formula Δ toh＝Ta-TsIs calculated to obtain, wherein TsIs the fluid temperature monitored by the temperature sensor 330. When the degree of superheat in the fluid circuit 20 suddenly drops from the rising state, or when it is observed that the boiling fine bubbles form larger film-like bubbles on the surface of the heating element 130, the voltage of the power source 310 should be immediately reduced to a degree of superheat lower than the maximum degree of superheat in the rising state.
S40: the moving track and moving speed of the bubble in the flow channel 1010 are analyzed. Specifically, by intermittently adjusting the voltage U of the power source 310, micro-bubbles are intermittently generated on the surface of the heating assembly 130, thereby simulating the flow conditions of the fluid in the flow field during the operation of the fuel cell. An experimenter can judge the distribution uniformity of the fluid in the flow channels 1010 by analyzing the moving tracks of the micro-bubbles in the flow channels 1010 and the flowing speed of the bubbles in the single flow channel 1010.
The visual measuring device controls the temperature of the heating element 130 by the power source 310, controls the degree of superheat of the entire fluid circuit 20 and the surface heat generation rate of the heating element 130 by utilizing the principle that the boiling bubbles are smaller as the degree of superheat is larger, and makes the size of the generated boiling bubbles smaller than the cross-sectional size of the flow channel 1010, thereby more truly reflecting the flowing state of the fluid in the flow channel 1010 when the fuel cell is operated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A visual measurement device, comprising:
the assembly body comprises a polar plate, a first side plate, a second side plate and a heating assembly, wherein the first side plate and the second side plate are respectively positioned on two sides of the polar plate to form a closed flow field in a surrounding manner, the first side plate is made of transparent materials and is provided with a liquid inlet piece and a liquid outlet piece, and the heating assembly is arranged between the polar plate and the second side plate;
the fluid loop comprises a driving pump and a fluid pipeline, wherein the driving pump is respectively connected with the liquid inlet part and the liquid outlet part through the fluid pipeline so as to communicate the assembly body into the fluid loop; and
the control system comprises a power supply, a monitoring module and a temperature sensor, wherein the power supply and the monitoring module are electrically connected to the heating assembly, the power supply can drive the heating assembly to generate heat, the monitoring module can monitor the resistance and the temperature of the heating assembly, and the temperature sensor is arranged on the fluid pipeline to detect the temperature of fluid.
2. The visual measurement device of claim 1, wherein the fluid circuit further comprises a flow meter and a regulator valve, both disposed on the fluid conduit.
3. The visual measurement device of claim 1, wherein the fluid circuit further comprises a pressure control assembly comprising a water tank, a gas cylinder, and a pressure relief valve, the gas cylinder connected into the water tank through the pressure relief valve, the water tank in communication with the fluid conduit to control a system pressure of the fluid circuit.
4. The visual measuring device of claim 1, wherein the heating assembly comprises a thermocouple and electrodes disposed at two ends of the thermocouple, the electrodes are disposed through the second side plate and partially exposed from the second side plate, and the power supply and the detection module are electrically connected to the heating assembly through hydrophobic electrodes.
5. The visual measuring device of claim 1, wherein the pole plate is provided with a plurality of flow channels, and the flow channels are communicated with the liquid inlet piece and the liquid outlet piece.
6. The visual measuring device of claim 1, wherein the number of the liquid inlet part and the liquid outlet part is at least three, and the liquid inlet part and the liquid outlet part are respectively used for liquid circulation, air circulation and hydrogen circulation.
7. The visual measuring device of claim 1, wherein a control valve is disposed on the fluid circuit, the control valve being capable of controlled communication with or blocking the flow-through circuit.
8. A visual measurement method, comprising the steps of:
measuring the initial resistance and the temperature coefficient of resistance of the heating assembly;
opening the camera equipment to shoot the fluid in the flow channel;
adjusting the output voltage of the power supply to make the surface of the heating component generate micro bubbles intermittently;
and analyzing the moving track and the moving speed of the bubbles in the flow channel.
9. The visual measurement method of claim 8, wherein adjusting the output voltage of the power source to intermittently generate microbubbles on the surface of the heating element comprises:
adjusting a system pressure of the flow-through loop to adjust a saturation temperature of the fluid and determine an initial boiling point parameter and a critical heat flux density;
calculating the surface heating rate of the heating component and adjusting the voltage to make the surface heating rate larger than the initial boiling point parameter and smaller than the critical heat flow density.
10. The visual measurement method of claim 8, wherein adjusting the output voltage of the power source to intermittently cause the surface of the heating assembly to generate microbubbles further comprises:
adjusting a system pressure of the circulation loop to adjust a saturation temperature of the fluid and determine a starting point superheat degree;
calculating the superheat degree of the circulation loop and adjusting the voltage to make the superheat degree larger than the starting point superheat degree.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115000463A (en) * | 2022-07-15 | 2022-09-02 | 东方电气(成都)氢燃料电池科技有限公司 | Movable visual testing device for fuel cell and using method thereof |
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