CN113267267A - Non-contact electrical impedance temperature measuring device in high-temperature environment and processing method thereof - Google Patents
Non-contact electrical impedance temperature measuring device in high-temperature environment and processing method thereof Download PDFInfo
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- CN113267267A CN113267267A CN202110512735.2A CN202110512735A CN113267267A CN 113267267 A CN113267267 A CN 113267267A CN 202110512735 A CN202110512735 A CN 202110512735A CN 113267267 A CN113267267 A CN 113267267A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
- G01K1/12—Protective devices, e.g. casings for preventing damage due to heat overloading
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/04—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies
- G01K13/08—Thermometers specially adapted for specific purposes for measuring temperature of moving solid bodies in rotary movement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
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Abstract
The invention discloses a non-contact electrical impedance temperature measuring device under high temperature environment and a processing method thereof, relating to the field of temperature detection, comprising a microfluid coil, a liquid metal circulating flow channel, a liquid metal storage device, a liquid metal circulating pump, a signal processing and transmitting device and a graphite electrode, wherein the microfluid coil is provided with a plurality of coil arrays which are formed and are positioned in an aircraft engine and are not contacted with turbine blades, two ends of the microfluid coil are communicated with the liquid metal circulating flow channel which is communicated with the liquid metal storage device, the liquid metal circulating flow channel is also provided with the liquid metal circulating pump and a pair of graphite electrodes, the graphite electrodes are connected with the signal processing and transmitting device, the temperature measuring device can be used for measuring the surface temperature of the turbine blades under ultrahigh temperature, the temperature measuring precision is high, the durability is good, and the non-contact monitoring is realized, the influence on the blade and the flow field is small.
Description
Technical Field
The invention relates to the field of temperature detection, in particular to a non-contact electrical impedance temperature measuring device in a high-temperature environment and a processing method thereof.
Background
The turbine blade is a core component for power output of the aero-engine, accurately, reliably and continuously monitors the temperature field on line, and is the key for ensuring safe, efficient and long-life operation of the engine. Modern aircraft engines develop towards high thrust, high thrust-weight ratio and high thermal efficiency, so that the temperature of turbine gas continuously rises, and the working environment of blades is extremely severe. In a complex environment with high temperature, high pressure and high rotating speed, the sensitive material of the conventional sensor is easy to generate phase change and oxidation, cannot realize accurate monitoring of extreme temperature response, and cannot stably run for a long time. Therefore, the research on novel high-temperature detection technology and device structure realizes the sensitive and stable work of sensitive materials in high-temperature severe environment, and is an urgent problem to be solved for accurate, reliable and continuous online monitoring of the temperature field of the turbine blade.
The temperature detection means suitable for the high-temperature extreme environment in the prior art is mainly a non-contact detection method, the method does not damage the blade structure, has small influence on the performance and the operation safety of an engine, a gas flow field and a blade temperature field, and is more accurate and reliable in temperature detection.
Common non-contact temperature field detection methods include radiation temperature measurement, temperature indicating paint and the like. The radiation thermometer is influenced by refraction, gas absorption spectrum and background radiation generated on the surface of the blade by heat radiation in a high-temperature complex environment in which the turbine blade works, and the temperature measurement precision is low; the temperature measuring precision of the temperature indicating paint is low, and the temperature indicating paint cannot be repeatedly used for a long time, so that the continuous online monitoring of the temperature of the turbine blade cannot be realized.
Disclosure of Invention
The invention aims to provide a non-contact electrical impedance temperature measuring device in a high-temperature environment and a processing method thereof.
A non-contact electrical impedance temperature measuring device in a high-temperature environment comprises a microfluid coil 1, a liquid metal circulating flow channel 2, a liquid metal storage device 3, a liquid metal circulating pump 4, a signal processing and transmitting device 5 and a graphite electrode 8, wherein the microfluid coil 1 is provided with a plurality of coils which form a coil array and is positioned in an aeroengine and not contacted with turbine blades, and two ends of the microfluid coil 1 are communicated with the liquid metal circulating flow channel 2;
the liquid metal circulating flow passage 2 is communicated with the liquid metal storage device 3, the liquid metal circulating flow passage 2 is also provided with a liquid metal circulating pump 4 and a pair of graphite electrodes 8, and the graphite electrodes 8 are connected with the signal processing and transmitting device 5;
the microfluidic coil 1, the liquid metal circulating flow channel 2 and the liquid metal storage device 3 are filled with liquid metal gallium.
Preferably, the liquid metal circulation flow channel 2 includes a liquid metal inflow channel and a liquid metal outflow channel, the liquid metal inflow channel and the liquid metal outflow channel are respectively connected with an inlet and an outlet of the microfluidic coil 1, an anode and a cathode of the graphite electrode 8 are respectively installed on the liquid metal inflow channel and the liquid metal outflow channel, and the graphite electrode 8 is provided as a section of pipeline and becomes a part of the liquid metal inflow channel and the liquid metal outflow channel.
Preferably, a cooling and heat dissipating device 7 is arranged outside the liquid metal storage device 3.
Preferably, the liquid metal storage device 3 is provided with a first storage chamber 31 and a second storage chamber 32, the first storage chamber 31 and the second storage chamber 32 are respectively provided with a first liquid level detection sensor 33 and a second liquid level detection sensor 34, and the liquid metal circulating pump 4 comprises a first peristaltic pump 41 and a second peristaltic pump 42 which are respectively arranged on the liquid metal inflow channel and the liquid metal outflow channel.
Preferably, the liquid metal storage device 3 can be fused with the liquid metal circulating pump 4 to form a bidirectional injection pump 9, the bidirectional injection pump 9 is a cylindrical metal tank, a first injection chamber 91 and a second injection chamber 92 are arranged in the bidirectional injection pump, the first injection chamber and the second injection chamber are separated by a piston 93, the piston 93 is driven by a stepping motor and is connected in the metal tank in a sliding mode, limit switches 94 are arranged in the first injection chamber 91 and the second injection chamber 92, and the limit switches 94 can control the steering direction of the stepping motor.
Preferably, the signal processing and transmitting device 5 is further connected with a display terminal 6.
Preferably, the method for processing and manufacturing the microfluidic coil comprises the following steps,
manufacturing a spiral polymer micro-channel as a micro-casting mould by using a micro-nano 3D printing technology;
injecting liquid metal gallium into the spiral polymer micro-channel, and placing the spiral polymer micro-channel device in a 280K oil bath to promote the solidification of the liquid metal gallium;
step three, placing the whole device in the step two in an organic solvent at the temperature of 280K, dissolving the spiral polymer micro-channel, and extracting a solid gallium coil;
placing the solid gallium coil in a mould, and packaging the gallium coil by using liquid ceramic; placing the ceramic in a vacuum environment at 290K to remove bubbles in the liquid ceramic;
and fifthly, obtaining a micro-fluid pipeline, and filling the micro-fluid pipeline with liquid gallium to obtain the micro-fluid coil.
Preferably, the liquid metal gallium can be replaced by other liquid metals with low melting points and good stability.
Preferably, in the first step, the prepared spiral polymer micro-flow channel has an equivalent diameter less than or equal to 40 μm.
The invention has the advantages that:
1. the electrical impedance is detected by adopting the eddy current to detect the metal surface defects and the surface temperature of the turbine blade without contacting the turbine blade, the electrical conductivity of the metal material of the turbine blade is sensitive to the temperature, and the electrical conductivity of the surface layer of the blade can be detected by adopting the eddy current sensor through detecting the mutual inductance between the coil and the turbine blade, so that the surface temperature of the blade is detected; compared with radiation temperature measurement, the eddy current temperature measurement method is less influenced by surrounding environment factors such as gas flow, device surface coking and the like, and has high detection precision;
2. the liquid metal is adopted to replace a conventional solid metal coil, and the main body of the outer micro pipeline is processed by high-temperature ceramic, so that the problems of large temperature detection error, low precision, drift and the like caused by tissue phase change, recrystallization and the like of conventional sensitive materials in a high-temperature extreme environment are solved;
3. the liquid metal microcirculation is adopted, the metabolism and self-repairing of the sensitive material under the high-temperature condition are realized, and the problems of oxidation, performance degradation, short survival time and the like of the sensitive material in the high-temperature limit environment can be solved;
4, the electrical impedance device has simple structure, does not need a complex optical device, and is convenient for integration and miniaturization; the invention realizes the non-contact detection of the temperature field on the surface layer of the turbine blade by forming the liquid metal microfluid array, and has high precision and small interference on the blade and the flow field.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the structure of a microfluidic coil in the device of the present invention;
FIG. 3 is a schematic view of the structure of a bi-directional syringe pump in the apparatus of the present invention;
FIG. 4 is a schematic view of the liquid metal reservoir and liquid metal circulation pump of the apparatus of the present invention;
the device comprises a micro-fluid coil 1, a micro-fluid coil 2, a liquid metal circulating flow channel 3, a liquid metal storage device 31, a first storage chamber 32, a second storage chamber 33, a first liquid level detection sensor 34, a second liquid level detection sensor 4, a liquid metal circulating pump 41, a first peristaltic pump 42, a second peristaltic pump 5, a signal processing and transmitting device 6, a display terminal 7, a cooling and radiating device 8, a graphite electrode 9, a bidirectional injection pump 91, a first injection chamber 92, a second injection chamber 93, a piston 94 and a limit switch.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 4, a non-contact electrical impedance temperature measuring device in a high temperature environment comprises a microfluidic coil 1, a liquid metal circulation flow channel 2, a liquid metal storage device 3, a liquid metal circulation pump 4, a signal processing and transmitting device 5 and a graphite electrode 8, wherein the microfluidic coil 1 is provided with a plurality of coils which form a coil array and is located in an aircraft engine and is not in contact with turbine blades, and two ends of the microfluidic coil 1 are communicated with the liquid metal circulation flow channel 2;
the liquid metal circulating flow passage 2 is communicated with the liquid metal storage device 3, the liquid metal circulating flow passage 2 is also provided with a liquid metal circulating pump 4 and a pair of graphite electrodes 8, and the graphite electrodes 8 are connected with the signal processing and transmitting device 5;
the microfluidic coil 1, the liquid metal circulating flow channel 2 and the liquid metal storage device 3 are filled with liquid metal gallium.
The liquid metal circulating flow channel 2 comprises a liquid metal inflow channel and a liquid metal outflow channel, the liquid metal inflow channel and the liquid metal outflow channel are respectively connected with an inlet and an outlet of the microfluidic coil 1, the anode and the cathode of the graphite electrode 8 are respectively arranged on the liquid metal inflow channel and the liquid metal outflow channel, and the graphite electrode 8 is arranged as a section of pipeline and becomes a part of the liquid metal inflow channel and the liquid metal outflow channel.
And a cooling and heat-radiating device 7 is arranged outside the liquid metal storage device 3.
The liquid metal storage device 3 is internally provided with a first storage chamber 31 and a second storage chamber 32, the first storage chamber 31 and the second storage chamber 32 are respectively provided with a first liquid level detection sensor 33 and a second liquid level detection sensor 34, and the liquid metal circulating pump 4 comprises a first peristaltic pump 41 and a second peristaltic pump 42 which are respectively arranged on a liquid metal inflow channel and a liquid metal outflow channel.
The liquid metal storage device 3 can also be fused with the liquid metal circulating pump 4 to form a bidirectional injection pump 9, the bidirectional injection pump 9 is a cylindrical metal tank, a first injection chamber 91 and a second injection chamber 92 are arranged in the bidirectional injection pump, the first injection chamber 91 and the second injection chamber 92 are separated by a piston 93, the piston 93 is driven by the stepping motor and is connected in the metal tank in a sliding mode, limit switches 94 are arranged in the first injection chamber 91 and the second injection chamber 92, and the limit switches 94 can control the steering of the stepping motor.
The signal processing and transmitting device 5 is also connected with a display terminal 6.
The manufacturing method of the micro-fluid coil comprises the following steps,
manufacturing a spiral polymer micro-channel as a micro-casting mould by using a micro-nano 3D printing technology;
injecting liquid metal gallium into the spiral polymer micro-channel, and placing the spiral polymer micro-channel device in a 280K oil bath to promote the solidification of the liquid metal gallium;
step three, placing the whole device in the step two in an organic solvent at the temperature of 280K, dissolving the spiral polymer micro-channel, and extracting a solid gallium coil;
placing the solid gallium coil in a mould, and packaging the gallium coil by using liquid ceramic; placing the ceramic in a vacuum environment at 290K to remove bubbles in the liquid ceramic;
and fifthly, obtaining a micro-fluid pipeline, and filling the micro-fluid pipeline with liquid gallium to obtain the micro-fluid coil.
The liquid metal gallium can also be replaced by other liquid metals with low melting point and good stability.
In the first step, the equivalent diameter of the prepared spiral polymer micro-flow channel is less than or equal to 40 mu m.
The specific implementation mode and principle are as follows:
in the first embodiment, the liquid metal storage device 3 and the liquid metal circulation pump 4 are integrated to form the bidirectional injection pump 9, and two chambers 91 and 92 are arranged in the bidirectional injection pump 9 and are separated by a piston 93. The first injection cavity 91 is communicated with the liquid metal inflow channel, the second injection cavity 92 is communicated with the liquid metal outflow channel, limit switches 94 are arranged in the first injection cavity 91 and the second injection cavity 92, the cooling and heat dissipation device 7 is arranged outside the bidirectional injection pump, and the piston 93 is driven by the stepping motor to do linear reciprocating motion in the space of the pump body;
in the working process, liquid metal with lower temperature in the first injection chamber 91 flows into the microfluidic coil 1 along the liquid metal inflow channel 2 under the driving of the pump, high-temperature liquid metal flowing out of the microfluidic coil 1 flows back to the second injection chamber 92 of the bidirectional injection pump 9 along the liquid metal outflow channel, and exchanges heat with the cooling and heat dissipation device, in the process, as the liquid in the first injection chamber 91 is gradually reduced, the liquid in the second injection chamber 92 is increased, the position of the piston 93 is continuously moved towards the first injection chamber 91, the volume of the first injection chamber 91 is reduced, the volume of the second injection chamber 92 is increased, when the volume of the liquid in the first injection chamber 91 reaches the lowest threshold value, the piston 93 touches the limit switch 94 in the first injection chamber 91, the stepping motor reversely drives the piston 93, the piston 93 moves towards the second chamber, and therefore, the liquid in the liquid metal circulation channel and the microfluidic coil reversely flows, until the piston 93 touches the limit switch 94 in the second injection chamber 92, i.e., the volume of liquid in the second injection chamber 92 reaches the minimum threshold, one cycle ends, the flow direction of the fluid returns to the positive direction, and the process of the previous cycle is repeated.
In the second embodiment, the liquid metal storage device 3 and the liquid metal circulation pump 4 may be separately disposed, and two chambers 31 and 32 separated from each other are disposed in the liquid metal storage device 3, and are respectively communicated with the liquid metal inflow passage and the liquid metal outflow passage. The liquid metal circulating pump 4 can be selected from a peristaltic pump I41 and a peristaltic pump II 42, and the peristaltic pump I41 and the peristaltic pump II 42 are respectively arranged on the liquid metal inflow channel and the liquid metal outflow channel;
the first storage chamber 31 and the second storage chamber 32 are respectively provided with a first liquid level detection sensor 33 and a second liquid level detection sensor 34. The liquid level detection sensor and the peristaltic pump are in electrical signal connection with the controller. In the working process, the liquid metal with lower temperature in the first storage chamber 3131 flows into the microfluidic coil 1 along the liquid metal inflow channel under the driving of the peristaltic pump 41, and the high-temperature liquid metal flowing out of the microfluidic coil 1 flows back to the second storage chamber 32 along the liquid metal outflow channel and exchanges heat with the cooling and heat-dissipating device 7;
in the process, as the liquid in the first storage chamber 31 gradually decreases and the liquid in the second storage chamber 32 increases, when the volume of the liquid in the first storage chamber 31 reaches the minimum threshold value, the controller receives a liquid level signal of the first liquid level detection sensor 33 and sends out a command to stop the operation of the first peristaltic pump 41 on the liquid metal inflow channel and start the operation of the second peristaltic pump 42 on the liquid metal outflow channel, so that the liquid in the liquid metal circulation channel and the microfluidic coil reversely flows, flows out of the second storage chamber 32 and returns to the first storage chamber 31, until the volume of the liquid in the second storage chamber 32 reaches the minimum threshold value, a cycle is ended, the flow direction of the fluid returns to the forward direction, and the previous cycle process is continuously repeated.
Based on the above, the temperature measuring device can be used for measuring the surface temperature of the turbine blade at the ultrahigh temperature, has high temperature measuring precision and good durability, monitors in a non-contact manner, and has small influence on the blade and a flow field.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Claims (10)
1. The non-contact electrical impedance temperature measuring device under the high-temperature environment is characterized by comprising a microfluid coil (1), a liquid metal circulating flow channel (2), a liquid metal storage device (3), a liquid metal circulating pump (4), a signal processing and transmitting device (5) and a graphite electrode (8), wherein the microfluid coil (1) is provided with a plurality of coils to form a coil array, is positioned in an aircraft engine and is not contacted with turbine blades, and two ends of the microfluid coil (1) are communicated with the liquid metal circulating flow channel (2);
the liquid metal circulating flow passage (2) is communicated with the liquid metal storage device (3), the liquid metal circulating flow passage (2) is also provided with a liquid metal circulating pump (4) and a pair of graphite electrodes (8), and the graphite electrodes (8) are connected with the signal processing and transmitting device (5);
the micro-fluid coil (1), the liquid metal circulating flow channel (2) and the liquid metal storage device (3) are filled with liquid metal gallium.
2. The non-contact electrical impedance temperature measuring device in the high-temperature environment according to claim 1, wherein: the liquid metal circulating flow channel (2) comprises a liquid metal inflow channel and a liquid metal outflow channel, the liquid metal inflow channel and the liquid metal outflow channel are respectively connected with an inlet and an outlet of the microfluidic coil (1), and the anode and the cathode of the graphite electrode (8) are respectively arranged on the liquid metal inflow channel and the liquid metal outflow channel.
3. The non-contact electrical impedance temperature measuring device in the high-temperature environment according to claim 2, wherein: the graphite electrode (8) is arranged as a section of pipe, which becomes part of the liquid metal inflow channel and the liquid metal outflow channel.
4. The non-contact electrical impedance temperature measuring device in the high-temperature environment according to claim 1, wherein: and a cooling and heat-radiating device (7) is arranged on the outer side of the liquid metal storage device (3).
5. The non-contact electrical impedance temperature measuring device in the high-temperature environment according to claim 4, wherein: be equipped with storage chamber one (31) and storage chamber two (32) in liquid metal storage device (3), storage chamber one (31) and storage chamber two (32) are equipped with level detection sensor one (33) and level detection sensor two (34) respectively, liquid metal circulating pump (4) are including setting up peristaltic pump one (41) and peristaltic pump two (42) on liquid metal inflow passageway and liquid metal outflow passageway respectively.
6. The non-contact electrical impedance temperature measuring device in the high-temperature environment according to claim 4, wherein: liquid metal storage device (3) can also fuse with liquid metal circulating pump (4) and constitute two-way syringe pump (9), two-way syringe pump (9) are cylindrical metal can, wherein are equipped with injection chamber one (91) and injection chamber two (92), and the two separates through piston (93), piston (93) receive step motor drive and sliding connection in the metal can, all be equipped with limit switch (94) in injection chamber one (91) and injection chamber two (92), limit switch (94) can control step motor's the turning to.
7. The non-contact electrical impedance temperature measuring device in the high-temperature environment according to claim 1, wherein: the signal processing and transmitting device (5) is also connected with a display terminal (6).
8. The method for processing and manufacturing the microfluidic coil in the non-contact electrical impedance temperature measuring device under the high-temperature environment according to claim 1, wherein the method comprises the following steps: comprises the following steps of (a) carrying out,
manufacturing a spiral polymer micro-channel as a micro-casting mould by using a micro-nano 3D printing technology;
injecting liquid metal gallium into the spiral polymer micro-channel, and placing the spiral polymer micro-channel device in a 280K oil bath to promote the solidification of the liquid metal gallium;
step three, placing the whole device in the step two in an organic solvent at the temperature of 280K, dissolving the spiral polymer micro-channel, and extracting a solid gallium coil;
placing the solid gallium coil in a mould, and packaging the gallium coil by using liquid ceramic; placing the ceramic in a vacuum environment at 290K to remove bubbles in the liquid ceramic;
and fifthly, obtaining a micro-fluid pipeline, and filling the micro-fluid pipeline with liquid gallium to obtain the micro-fluid coil.
9. The method for manufacturing a microfluidic coil according to claim 8, wherein: the liquid metal gallium can also be replaced by other liquid metals with low melting point and good stability.
10. The method for manufacturing a microfluidic coil according to claim 8, wherein: in the first step, the equivalent diameter of the prepared spiral polymer micro-flow channel is less than or equal to 40 mu m.
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| CN202110512735.2A CN113267267A (en) | 2021-05-11 | 2021-05-11 | Non-contact electrical impedance temperature measuring device in high-temperature environment and processing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485978A (en) * | 2022-02-14 | 2022-05-13 | 湖南大学 | Non-contact temperature measurement method and device based on material conductivity-temperature characteristic |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485978A (en) * | 2022-02-14 | 2022-05-13 | 湖南大学 | Non-contact temperature measurement method and device based on material conductivity-temperature characteristic |
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