CN113049642A - Non-contact type void fraction measuring system and method suitable for narrow rectangular channel - Google Patents
Non-contact type void fraction measuring system and method suitable for narrow rectangular channel Download PDFInfo
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Abstract
The invention provides a non-contact type void fraction measuring system suitable for a narrow rectangular channel, which comprises: the electrode assemblies are arranged on the same side of the PCB in a staggered mode; the PCB board is arranged on one side of the wall surface of the narrow rectangular channel; when the gas-liquid two-phase flow in the narrow rectangular channel passes through the PCB, the electrode assembly collects a conductance signal generated by the gas-liquid two-phase flow and converts the current signal into a vacuole portion. The invention can adjust the volume and the quantity of the electrode unit bodies through a plurality of groups of electrode unit bodies, and can measure the narrow rectangular channels with different sizes.
Description
Technical Field
The invention relates to the technical field of multiphase flow testing, in particular to a non-contact cavitation bubble fraction measuring system and method suitable for a narrow rectangular channel.
Background
The accurate measurement of the void fraction of the gas-liquid two-phase flow has important significance in the technical fields of engineering hydrodynamics, reactor thermal hydraulic power and oil field exploitation equipment. At present, the measurement of the void fraction of gas-liquid two-phase flow is generally carried out by adopting a contact probe, the measurement value of the probe can only reflect the average value of the void fraction at a local position, and certain disturbance is caused to a flow field. The plate-shaped fuel has reliable performance and high power density, and is widely applied to a nuclear power device for a ship. The coolant passes through the narrow rectangular channel formed by the plate-shaped fuel to take away the heat generated by the core. The rocking, heaving, sloshing under marine conditions may cause the core to boil, thereby producing a two-phase flow.
Through retrieval, patent document CN1654940A discloses a gas-liquid two-phase flow void fraction measuring instrument using a built-in 12-pole capacitance sensor, which comprises a built-in 12-pole capacitance sensor, a C/V conversion circuit, a multi-path time-sharing control signal circuit, a high-speed a/D data acquisition circuit, a D/a feedback circuit, a communication circuit and a computer. In the prior art, a 12-pole capacitance sensor is connected in a measuring pipeline, and an accurate measuring result is finally obtained through data processing of a measuring circuit and a computer, but the prior art has the defects that the flow field is greatly disturbed due to the fact that the contact type measuring is directly placed in a narrow rectangular channel, and the void fraction parameter of a certain space point in the flow channel can only be obtained at one time.
Patent document CN111912880A discloses a narrow rectangular channel full-field transient state void fraction measuring system, which includes a detector module, a transmitting circuit, a receiving circuit and a calculation and analysis module, wherein the detector module includes an electrode plate array and an electric signal receiving bottom plate, the electrode plate array is arranged on the inner wall surface of an upper flow channel plate, and the lower flow channel plate is used as the electric signal receiving bottom plate; a voltage signal is sequentially sent to each electrode plate of the electrode plate array through the transmitting circuit, and the current generated after the electrode plates are excited passes through a two-phase flow fluid medium between the electrode plates and the electric signal receiving bottom plate and then is sent back to the receiving circuit through the electric signal receiving bottom plate; and the calculation and analysis module calculates the conductivity of the medium at the corresponding electrode plate from the magnitude of the current signal received by the receiving circuit according to the time sequence, and calculates the phase state of the medium at the electrode plate. Although the prior art uses a detector module to measure the void fraction, a contact measurement method is still used, and large disturbance is still caused to the flow field.
Patent document CN109557113A discloses a gamma ray scanning device and method for measuring gas content of a gas/vapor-liquid two-phase flow cross section, which includes a fixed platform, a stepping motor driving device fixed on the fixed platform, a sliding table of the stepping motor driving device is fixedly connected with a movable platform through a bolt, the bottom of the movable platform is connected with the fixed platform through a roller in a contact manner, a gamma ray source and a radioactive source receiving device of a lead can are fixed on the movable platform, a test tube is arranged between the gamma ray source and the radioactive source receiving device, collimators are respectively arranged at the front end of the radioactive source receiving device and the radiation end of the gamma ray source, and the signal output end of the radioactive source receiving device is connected with the input end of a ray collector; the test tube is connected with a gas-liquid two-phase flow generation and control system. The defects of the prior art are that the power of the gamma ray is high, the heating effect on a narrow channel flow field is obvious, and the accurate measurement of the vacuole fraction is not facilitated.
Meanwhile, the contact type silk screen probe commonly used at the present stage is too large in size, is difficult to directly place in a narrow rectangular channel, and can cause great disturbance to a flow field. Meanwhile, the resolution ratio of the traditional stainless steel wire electrode is lower due to the narrow section of the narrow rectangular channel. Conventional silk-screen probes use two sets of stainless steel wires as electrodes, and when bubbles pass through the two sets of stainless steel wires vertically, the change of the void fraction will cause the conductance signal to change. Meanwhile, the conventional wire mesh probe has certain defects. On the one hand, the stainless steel wire used by the traditional silk screen probe is large in size, and the stainless steel wire needs to be welded on two sides of a PCB simultaneously. Bubbles must pass through the double-layer wire mesh probe during measurement, and therefore disturbance to bubbles, especially bubble flow, is large. On the other hand, the conventional silk screen probe body is a PCB, and the PCB needs to be vertically placed in a flow field to be measured in an application process, and such an installation manner is not suitable for a narrow and long structure such as a narrow rectangular channel.
Therefore, there is a need to design a full-flow-field non-contact void fraction measuring system for narrow rectangular channels, and accurate measurement of void fraction in the narrow rectangular channels is of great significance to the safety of marine nuclear power plants.
Disclosure of Invention
In view of the drawbacks of the prior art, the present invention provides a non-contact vacuole fraction measurement system and method suitable for narrow rectangular channels, which obtains the vacuole fraction distribution by analyzing the electrical signals of the electrode matrix in a non-contact manner.
The invention provides a non-contact void fraction measuring system suitable for a narrow rectangular channel, which comprises: the electrode assemblies are arranged on the same side of the PCB in a staggered mode;
the PCB board is arranged on one side of the wall surface of the narrow rectangular channel;
when the gas-liquid two-phase flow in the narrow rectangular channel passes through the PCB, the electrode assembly collects a conductance signal generated by the gas-liquid two-phase flow and converts the current signal into a vacuole portion.
Preferably, the emitter and the receiver are in an E-shaped configuration, and the emitter and the receiver are relatively staggered.
Preferably, the emitter comprises a lead hole and an emitter probe, the emitter probe is arranged on the emitter, and the lead hole is arranged at one end of the emitter; the receiving electrode is provided with a receiving electrode probe.
Preferably, the emitter and the receiver form two electrode units, and the electrode units are arranged on the PCB in a row.
Preferably, the receiving electrodes of each column of electrode unit cells are connected in series, and the emitting electrodes of each column of electrode unit cells are connected in parallel.
Preferably, a sample-and-hold circuit is further included, the sample-and-hold circuit being electrically connected to the receiver electrode.
Preferably, the sampling circuit further comprises a signal amplifier, and the signal amplifier is arranged on the sampling holding circuit.
According to the non-contact void fraction measuring method suitable for the narrow rectangular channel provided by the invention, the non-contact measurement of the void fraction is carried out by adopting the non-contact void fraction measuring system suitable for the narrow rectangular channel, and the method comprises the following steps:
step S1: dividing the electrode assembly into a plurality of emitters and a plurality of receivers, wherein the emitters and the receivers are arranged in a staggered manner;
step S2: arranging the emitting electrodes and the receiving electrodes in a pairwise opposite staggered manner to form electrode unit bodies, wherein the electrode unit bodies are sequentially distributed on the front side of the PCB;
step S3: the probes of the emitter and the probes of the receiver are conducted through a circuit to form an electrode matrix;
step S4: sequentially communicating probes of the emitting electrodes and probes of the receiving electrodes of all the electrode unit bodies with a power supply to obtain current signals of the electrode unit bodies at different positions;
step S5: and converting the received current signal into a vacuole share distribution.
Preferably, in step S4, after the electrical circuits of the electrode unit cells are sequentially turned on, corresponding electrical signals I (x, y) are calculated, wherein (x, y) is the coordinate number of the unit cell.
Preferably, the Bruggeman relationship in step S5 is:
α＝(Kl-Kexp)/(Kl-Kg)；
wherein, Kl、KgAnd KexpThe resistance value in the pure liquid phase, the resistance value in the pure gas phase and the actually measured resistance value are respectively.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can adjust the volume and the quantity of the electrode unit bodies through a plurality of groups of electrode unit bodies, and can measure the narrow rectangular channels with different sizes.
2. According to the invention, the probes of the receiving electrode and the emitting electrode are arranged on the front surface of the PCB, and the PCB is directly arranged on one side of the narrow rectangular channel. When the gas-liquid two-phase flow passes through the PCB, the corresponding electric signal and the void fraction can be measured.
3. The gas-liquid two-phase flow in the gas enters the narrow rectangular channel through the inlet positioned at the lower part, when the two-phase flow horizontally sweeps across the PCB, the current signal is recorded by the electrode assembly on the PCB, and the flow field is not disturbed in the whole process.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic diagram of a non-contact void fraction measurement system for narrow rectangular channels according to the present invention;
FIG. 2 is an installation diagram of a non-contact void fraction measuring system suitable for a narrow rectangular channel in the present invention;
fig. 3 is a schematic structural diagram of an electrode unit body in a non-contact cavitation fraction measurement system suitable for a narrow rectangular channel in the invention.
In the figure:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, the present invention provides a non-contact void fraction measuring system suitable for a narrow rectangular channel, comprising: the electrode assembly and the PCB board 1 are arranged in a staggered mode at the same side of the PCB board 1; the electrode assembly comprises a plurality of emitting electrodes 5 and a plurality of receiving electrodes 6, and the PCB board 1 is installed on one side of the wall surface of the narrow rectangular channel; when the gas-liquid two-phase flow in the narrow rectangular channel passes through the PCB (printed Circuit Board) 1, the electrode assembly collects a conductance signal generated by the gas-liquid two-phase flow and converts a current signal into a vacuole fraction.
Further, the emitter electrode 5 and the receiver electrode 6 are in an E-shaped structure, and the emitter electrode 5 and the receiver electrode 6 are arranged in a staggered manner. The emitter probe 3 is arranged on the emitter 5, and the lead hole 2 is arranged at one end of the emitter 5; the receiving electrode 6 is provided with a receiving electrode probe 4. The emitter 5 and the receiver 6 form electrode units in pairs, and the electrode units are arranged on the PCB 1 in rows. The receiving electrodes 6 of each column of electrode unit bodies are connected in series, and the emitting electrodes 5 of each column of electrode unit bodies are connected in parallel.
Continuing further, a sample-and-hold circuit 10 and a signal amplifier 9 are included, the sample-and-hold circuit 10 is electrically connected to the receiver electrode 6, and the signal amplifier 9 is provided on the sample-and-hold circuit 10.
Still further, still include power 7, switching element 8 and control subsystem 9, switching element 8 one end is connected with power 7, and the other end is connected with emitter 5, and control subsystem 9 is connected with said sample hold circuit 10.
Example (b):
as shown in fig. 2 and 3, two sets of emitter 5 and receiver 6 are interlaced to form an electrode unit, the emitter 5 is a first E-type circuit, the receiver 6 is a second E-type circuit, and a circle center copper sheet is welded at the ends of the first E-type circuit and the second E-type circuit as an electrode. A certain number of electrode unit bodies are arranged in a rectangular shape to cover the area of the flow field to be measured.
Connecting the first E-shaped circuits in the same row through a dotted line in the figure, wherein a connecting line is positioned on the back of the PCB (printed circuit board) 1 and is connected with the first E-shaped circuits in the adjacent row through a lead hole 2 at the upper right corner of the first E-shaped circuits, and the circuits after series connection are connected with a power supply 7; the second E-type circuits in the same column are connected by solid lines in the figure, the solid lines are located on the front surface of the PCB, and the circuits after series connection are connected to the power supply 7 and to the sample-and-hold circuit 10. The area of the circuit other than the emitter probe 3 and the receiver probe 4 is covered with an insulating varnish so that the circuit remains insulated from the flow field.
The working principle is as follows:
connecting the circuit according to the serial number of the electrode unit bodies, and sequentially collecting electric signals transmitted by the power supply; respectively measuring electric signals when pure liquid phase flow, pure gas phase flow and gas-liquid two-phase flow; and converting a current signal in gas-liquid two-phase flow into local void fraction distribution so as to obtain the void fraction distribution of the whole flow field. Specifically, after connection, the electrical switch is first turned off S1, the emitter probe 3 and the receiver probe 4 in the first row are simultaneously activated, and the generated electrical signals pass through the signal amplifier 9 and the sample-and-hold circuit 10 and are simultaneously collected by the control subsystem 11. The foregoing steps are repeated to obtain the electrical signals I (x, y) for all electrode unit bodies. One wall surface of the narrow rectangular channel is replaced by the PCB board 1 and fixed. The gas-liquid two-phase flow enters the narrow rectangular channel through the inlet positioned at the lower part, and when the two-phase flow horizontally sweeps across the PCB (printed circuit board) 1, the conductance signal is recorded by the E-shaped copper electrode on the PCB. The flow field is not disturbed in the whole process.
The invention provides a non-contact void fraction measuring method suitable for a narrow rectangular channel, which adopts the non-contact void fraction measuring system suitable for the narrow rectangular channel to carry out non-contact measurement on void fractions and comprises the following steps:
step S1: dividing the electrode assembly into a plurality of emitters 5 and a plurality of receivers 6, the emitters 5 and the receivers 6 being arranged in a staggered manner with respect to each other;
step S2: arranging the emitter electrodes 5 and the receiver electrodes 6 in a pairwise opposite staggered manner to form electrode unit bodies, wherein the electrode unit bodies are sequentially distributed on the front surface of the PCB 1;
step S3: the probes of the emitter 5 and the probes of the receiver 6 are conducted through a circuit to form an electrode matrix;
step S4: sequentially communicating probes of the emitting electrodes and probes of the receiving electrodes of all the electrode unit bodies with a power supply to obtain current signals of the electrode unit bodies at different positions;
step S5: and converting the received current signal into a vacuole share distribution.
In step S4, the electrical circuits of the electrode unit cells are sequentially connected, and then the corresponding electrical signals I (x, y) are calculated, where (x, y) is the number of the unit cell.
In step S5, the current signal is converted into a vacuole fraction using a Bruggeman relationship, where the Bruggeman relationship is:
α＝(Kl-Kexp)/(Kl-Kg)，
this converts the resistance signal into the electrode probeIn which K isl、KgAnd KexpThe resistance value in the pure liquid phase, the resistance value in the pure gas phase and the actually measured resistance value are respectively.
In the invention, the current signal is directly measured and obtained through KWMSIL/UA is converted into a conductance signal, where L is the spacing of the electrodes, U is the voltage value, and a is the cross-sectional area of the electrodes.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, modules, units provided by the present invention as pure computer readable program code, the system and its various devices, modules, units provided by the present invention can be fully implemented by logically programming method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, modules and units thereof provided by the invention can be regarded as a hardware component, and the devices, modules and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, modules, units for performing the various functions may also be regarded as structures within both software modules and hardware components for performing the method.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A non-contact void fraction measurement system suitable for narrow rectangular channels, comprising: the electrode assemblies and the PCB (1) are arranged on the same side of the PCB (1) in a staggered mode;
the electrode assembly comprises a plurality of emitting electrodes (5) and a plurality of receiving electrodes (6), and the PCB (1) is installed on one side of the wall surface of the narrow rectangular channel;
when the gas-liquid two-phase flow in the narrow rectangular channel passes through the PCB (1), the electrode assembly collects a conductance signal generated by the gas-liquid two-phase flow and converts a current signal into a vacuole fraction.
2. The system for non-contact void fraction measurement suitable for narrow rectangular channels according to claim 1, wherein the emitter (5) and the receiver (6) are of an E-shaped structure, and the emitter (5) and the receiver (6) are arranged in a staggered manner.
3. The non-contact void fraction measuring system suitable for the narrow rectangular channel according to claim 1, wherein the emitter electrode (5) comprises a wire hole (2) and an emitter electrode probe (3), the emitter electrode probe (3) is arranged on the emitter electrode (5), the wire hole (2) is arranged at one end of the emitter electrode (5);
and a receiving electrode probe (4) is arranged on the receiving electrode (6).
4. The non-contact void fraction measurement system suitable for narrow rectangular channels according to claim 1, wherein the emitter (5) and the receiver (6) are combined two by two into electrode units, and the electrode units are arranged in a column on the PCB (1).
5. The non-contact void fraction measurement system suitable for the narrow rectangular channel according to claim 4, wherein the receiving electrodes (6) of each column of electrode unit bodies are connected in series, and the emitting electrodes (5) of each column of electrode unit bodies are connected in parallel.
6. The system for non-contact void fraction measurement suitable for narrow rectangular channels according to claim 1, further comprising a sample-and-hold circuit (10), wherein the sample-and-hold circuit (10) is electrically connected with the receiver electrode (6).
7. The non-contact void fraction measurement system suitable for the narrow rectangular channel according to claim 6, further comprising a signal amplifier (9), wherein the signal amplifier (9) is arranged on the sample-and-hold circuit (10).
8. A non-contact measurement method of void fraction for narrow rectangular channels, which is characterized in that the non-contact measurement system of void fraction for narrow rectangular channels in claim 1 is used for non-contact measurement of void fraction, and comprises the following steps:
step S1: the electrode assembly is divided into a plurality of emitting electrodes (5) and a plurality of receiving electrodes (6), and the emitting electrodes (5) and the receiving electrodes (6) are arranged in a staggered mode;
step S2: the emitting electrodes (5) and the receiving electrodes (6) are arranged in a pairwise opposite staggered manner to form electrode unit bodies, and the electrode unit bodies are sequentially distributed on the front side of the PCB (1);
step S3: the probes of the emitter (5) and the probes of the receiver (6) are conducted through a circuit to form an electrode matrix;
step S4: sequentially communicating probes of the emitting electrodes and probes of the receiving electrodes of all the electrode unit bodies with a power supply to obtain current signals of the electrode unit bodies at different positions;
step S5: and converting the received current signal into a vacuole share distribution.
9. The method for measuring the void fraction in a narrow rectangular channel in a non-contact manner as claimed in claim 8, wherein the step S4 is performed by sequentially connecting the electrical circuits of the electrode unit cells and then calculating the corresponding electrical signals I (x, y), wherein (x, y) is the number of the unit cells.
10. The method for measuring the void fraction in a narrow rectangular channel in a non-contact manner according to claim 8, wherein the relationship of Bruggeman in the step S5 is as follows:
α＝(Kl-Kexp)/(Kl-Kg)；
wherein, Kl、KgAnd KexpThe resistance value in the pure liquid phase, the resistance value in the pure gas phase and the actually measured resistance value are respectively.
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| CN202110260334.2A CN113049642A (en) | 2021-03-10 | 2021-03-10 | Non-contact type void fraction measuring system and method suitable for narrow rectangular channel |
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| CN202110260334.2A CN113049642A (en) | 2021-03-10 | 2021-03-10 | Non-contact type void fraction measuring system and method suitable for narrow rectangular channel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984839A (en) * | 2021-11-02 | 2022-01-28 | 上海交通大学 | Novel capacitive silk screen sensor for high-conductivity fluid measurement |
| CN114527177A (en) * | 2022-02-21 | 2022-05-24 | 上海交通大学 | Liquid metal gas-liquid two-phase flow cross section instantaneous vacuole share distribution imaging system |
| CN115166007A (en) * | 2022-07-27 | 2022-10-11 | 南京大学 | Cell potential non-contact detection device |
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| CN108195896A (en) * | 2017-12-05 | 2018-06-22 | 浙江大学 | A kind of staggered electrode formula capacitance chromatography imaging device applied to cryogen |
| CN109119176A (en) * | 2018-08-24 | 2019-01-01 | 西安交通大学 | The device and method of measurement fluid void fraction is combined with visualization using gamma-rays |
| CN111912880A (en) * | 2020-07-15 | 2020-11-10 | 中国核动力研究设计院 | Narrow rectangular channel full-field transient cavitation share measurement system and method |
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| US20030117154A1 (en) * | 2002-12-13 | 2003-06-26 | Yankielun Norbert E. | Method and instrument for electronically recording and imaging representations of the interaction of an object with its environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984839A (en) * | 2021-11-02 | 2022-01-28 | 上海交通大学 | Novel capacitive silk screen sensor for high-conductivity fluid measurement |
| CN114527177A (en) * | 2022-02-21 | 2022-05-24 | 上海交通大学 | Liquid metal gas-liquid two-phase flow cross section instantaneous vacuole share distribution imaging system |
| CN114527177B (en) * | 2022-02-21 | 2022-10-21 | 上海交通大学 | Liquid metal gas-liquid two-phase flow cross section instantaneous void fraction distribution imaging system |
| CN115166007A (en) * | 2022-07-27 | 2022-10-11 | 南京大学 | Cell potential non-contact detection device |
| CN115166007B (en) * | 2022-07-27 | 2023-07-18 | 南京大学 | Cell potential non-contact detection device |
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Application publication date: 20210629 |