CN105973929A - Non-destructive testing method for detecting thermal contact resistance inside parts by infrared camera - Google Patents
Non-destructive testing method for detecting thermal contact resistance inside parts by infrared camera Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000009659 non-destructive testing Methods 0.000 title abstract 3
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000001052 transient effect Effects 0.000 claims abstract description 8
- 238000002076 thermal analysis method Methods 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000001514 detection method Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 11
- 238000012546 transfer Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000009529 body temperature measurement Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 229910002804 graphite Inorganic materials 0.000 description 12
- 239000010439 graphite Substances 0.000 description 12
- 239000000498 cooling water Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- QZLJNVMRJXHARQ-UHFFFAOYSA-N [Zr].[Cr].[Cu] Chemical compound [Zr].[Cr].[Cu] QZLJNVMRJXHARQ-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 208000030208 low-grade fever Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
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Abstract
The invention discloses a non-destructive testing method for detecting thermal contact resistance inside parts by an infrared camera. The method is aimed at measuring thermal contact resistance of components inside a part in the low heat load area of an EAST (Experimental Advanced Superconducting Tokamak) device facing a plasma. The external surface of an experimental element is shot by an infrared temperature measurement technology so as to obtain evolution process of temperature of the experimental element changing with time; on the basis of finite element transient thermal analysis method, numerical simulation is carried out on heat transfer process of the experimental element; and numerical simulation results obtained under different thermal contact resistance conditions are compared with the experimental result. If the results are approximately the same, the corresponding thermal contact resistance is the thermal contact resistant inside the part. According to the invention, non-destructive testing of thermal contact resistance among components inside a part with a cooling structure can be realized. By the method, measurement accuracy of thermal contact resistance is raised.
Description
Technical field
The present invention relates to thermal contact resistance non-destructive measuring method field, specifically a kind of utilization infrared camera detection part
The lossless detection method of interior contact thermal resistance.
Background technology
EAST (Experimental Advanced Superconducting Tokamak) tokamak device low grade fever
The parts such as the plasma source components chromium-zirconium-copper generally by graphite tile with cooling structure faced by load area is heat sink
Composition, the most with bolts.For in the face of this kind of hot junction of plasma source components heat transfer component,
Accurately understand its temperature field particularly important with life appraisal etc. to safety Design, the fail-safe analysis of parts.By
Contact between the surface of solids thermal contact resistance the most closely caused be present in graphite tile and heat sink between contact surface, should
Thermal contact resistance is the key factor affecting part temperatures field.The too high estimation of thermal contact resistance can make whole portion
Part heaviness and inefficiency, underestimation then may bring potential safety hazard to parts.So accurately obtaining difference
Under the conditions of temperature, pressure and other parameters graphite tile and heat sink between thermal contact resistance, for towards plasma source components
Actual engineering design the most necessary.Both at home and abroad interface contact heat resistance measuring method is most commonly used that stable state at present
Method.Two contact samples maintain certain temperature difference, measure two samples axially on temperature value, then by Fourier
Law is extrapolated at contact interface thus the temperature difference (T that obtains on interface1-T2)；Heat flow (Q) can be by thermal flow meter
Measurement or thermal conductivity and thermograde by specimen material are calculated, thus Rc=| T1-T2|/Q.The party
Method has several significant defect: need the longer time；Experimental piece can be destroyed and (needed to process thermocouple
Hole), and then affect the accuracy of experimental result；The one-dimension temperature distribution of test specimen is unlikely to be straight line, this
Sample extrapolation exists for certain difficulty.Steady state method is applied to during actual engineering design have bigger limitation.Use
Infrared camera detection part interior contact thermal resistance is the one of Transient Method, and the method used at present is by infrared phase
Machine carries out high speed infrared two-dimension temperature record to two example interfaces of contact, then by one-dimensional solution of inverse problems matching
Obtain heat flow, thus be calculated the contact interface coefficient of heat conduction.
Summary of the invention
The present invention be in order to overcome the deficiencies in the prior art in place of, it is provided that a kind of based on infrared temperature-test technology with limited
The lossless detection method using infrared camera detection part interior contact thermal resistance of unit's Transient Thermal Analysis method, for face
The engineering design of this kind of hot junction of article on plasma body component heat transfer component provides technological means.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of lossless detection method using infrared camera detection part interior contact thermal resistance, it is characterised in that: bag
Include following steps:
(1), the experimental piece inner loop with cooling structure is passed through hot and cold water, and uses infrared temperature-test technology
Record experimental piece outer surface real-time infrared image, records its temperature evolution process in time；
(2), based on finite element Transient Thermal Analysis method, the operating mode of step (1) described experimental piece is carried out numerical value
Emulation, obtains experimental piece computation model hull-skin temperature evolution process in time according to simulation result, and in advance
If the initial value of a thermal contact resistance；
(3) thermal contact resistance, described in set-up procedure (2), obtains under the conditions of different thermal contact resistance outside experimental piece
The evolution process of surface temperature, contrasts the evolution process result that this simulation result and step (1) record
Analyzing, the thermal contact resistance corresponding time identical of both results is this experimental piece interior contact thermal resistance.
The method that the present invention proposes is not by shooting contact interface, but can be calculated by shooting parts surface
Go out thermal contact resistance, it is not necessary to processing experiment part, not only can solve the thermal contact resistance detection between parts surrounding part,
Thermal contact resistance between the part of components interior can be carried out detection simultaneously.
Accompanying drawing explanation
Fig. 1 is experiment test platform schematic diagram.
Fig. 2 is model experiment part internal cooling circuit figure.
Fig. 3 is finite element Transient Thermal Analysis model.
Fig. 4 is test and numerical analysis temperature evolution curve comparison diagram, wherein:
Fig. 4 a develops in time for different thermal contact resistances and the lower No. 26 graphite tile outer surface minimum temperatures of experiment condition
Process, Fig. 4 b drills in time for different thermal contact resistances and the lower No. 26 graphite tile outer surface maximum temperatures of experiment condition
Change process.
Fig. 5 is 450s, Rc=2 × 10-3(m2DEG C) W time, calculate and test the experimental piece hull-skin temperature obtained and divide
Cloth cloud atlas, wherein:
Fig. 5 a is FEM calculation figure, and Fig. 5 b is test figure.
Fig. 6 is flow chart of the present invention.
Detailed description of the invention
As shown in Figure 6, a kind of lossless detection method using infrared camera detection part interior contact thermal resistance, bag
Include following steps:
(1), the experimental piece inner loop with cooling structure is passed through hot and cold water, and uses infrared temperature-test technology
Record experimental piece outer surface real-time infrared image, records its temperature evolution process in time；
(2), based on finite element Transient Thermal Analysis method, the operating mode of step (1) experimental piece is carried out numerical simulation,
Obtain experimental piece computation model hull-skin temperature evolution process in time according to simulation result, and preset one
The initial value of thermal contact resistance；
(3) thermal contact resistance, described in set-up procedure (2), obtains under the conditions of different thermal contact resistance outside experimental piece
The evolution process of surface temperature, contrasts the evolution process result that this simulation result and step (1) record
Analyzing, the thermal contact resistance corresponding time identical of both results is this experimental piece interior contact thermal resistance.
Specific embodiment:
First, building EAST divertor parts heat transfer property test platform, its schematic diagram is as shown in Figure 1.Should
Platform is broadly divided into cold water stream and hot water stream, by hot and cold water tank (each 3m of volume3), heater (heating
Power 110kW), cooling-water machine (refrigeration work consumption 34kW), water pump (lift 7atm, flow 3m3/ h), real
The equipment such as the section of testing, industrial computer, infrared camera are constituted.Hot water or cold water is taken by hot water or cold water's pumping, bypass valve and
Main road valve is used for regulating flow, and the electromagnetic valve in hot and cold water route is used for realizing cold in experimental piece (5 DEG C), heat
Quick (in 1s) switching (handoff procedure remotely can be controlled by industrial computer) of water (90 DEG C).Enter experimental piece
Hot water or cold water's flow and temperature by the electromagnetic flowmeter before experimental piece and temperature sensor measurement, and by industry control
Machine remotely reads, and experimental piece hull-skin temperature evolution process in time is by infrared camera record.Hot water or cold water from
Experimental section out after, measure mouth pressure via pressure transducer, finally via after main road back pressure valve discharge.
Secondly, carrying out experiment for parts heat transfer property, experiment is divided into the Preparatory work of experiment stage, experiment carries out rank
Section and experiment ending phase.
(1) the Preparatory work of experiment stage (checks equipment, starts power supply, preparation hot and cold water, installation experimental piece, regulation stream
Amount): confirm that the position such as hot and cold water tank and pipeline is without the most damaged.Start successively main switch, heater button,
Cooling-water machine switch, pump switch and Signal-controlled switch.Open industrial computer and control software, confirming that software is normal
Run.Hot and cold water tank is filled water.Start handpiece Water Chilling Units and hot-water heater, by the moisture in hot and cold water tank
Do not cool down and be heated to 5 DEG C and 90 DEG C.Experimental piece is arranged on experiment porch, experimental piece cooling circuit such as figure
Shown in 2.Open cold, heat-exchanger pump, confirm pipe flange and experimental piece go out, the junction of water intake end is without leaking.
Open cold water pump, manually regulation cold water main road and bypass valve, make effusion meter instruction stabilize to 2m3/h.Close
Water supply pump, starts heat-exchanger pump, and manually regulation hot water main road valve makes effusion meter instruction stabilize to 2m3/h.Close
Heat-exchanger pump.
(2) experiment is carried out the stage (infrared camera thermometric, signals collecting): installation infrared camera also opens dependency number
According to acquisition software, adjust infrared camera and the relative position of experimental piece, make experimental piece just be positioned at infrared camera visual field
In.The parameters such as ambient parameter, data storage path and imaging time (600s) are set.Start water supply pump and with
The cooling water outlet valve of linkage, by controlling software, to make infrared camera start to record experimental piece outer surface infrared
Image, after gathering a period of time (300s mainly makes workpiece cooling put in place), closes water supply pump and cooling water outlet
Valve, opens heat-exchanger pump and the hot water outlet valve linked therewith, the most persistently 300s.
(3) experiment ending phase (dismounting experimental piece, close hull closure, instrument, deposit infrared thermoviewer): start
After experimental piece is cooled down by water supply pump completely, close water supply pump and enter penstock, and dismantling experimental piece.Close cold water
Outlet valve and outlet total valve, confirm that (shutdown signal controls equipment successively without closing industrial personal computer power after damaging
Switch, heater, cooler, pump switch, main switch).Close infrared camera power supply, by itself and experiment
Part leaves home in.
Then, for above-mentioned experimentation, based on the finite element Transient Thermal Analysis method heat transfer process to experimental piece
Carrying out numerical simulation, (computation model inner tube wall is set as convection transfer rate to computation model as shown in Figure 3
Border, convection transfer rate is obtained by Di Beisi-Bel spy's formula, and outer surface is radiation heat transfer border), obtain
Experimental piece hull-skin temperature evolution process in time, and by change graphite tile and heat sink between thermal contact resistance
Setting value, obtains the Numerical Simulation Results under the conditions of some thermal contact resistances.
Finally, the Numerical Simulation Results under the conditions of different thermal contact resistances is contrasted with experimental result, with No. 26 stones
As a example by ink watt, different thermal contact resistances and the lower No. 26 graphite tile outer surfaces of experiment condition are minimum and the most as shown in Figure 4
High-temperature evolution process in time, as seen from the figure, when thermal contact resistance Rc=2 × 10-3(m2DEG C)/W time minimum temperature two
Person is substantially the same, maximum temperature gap but As time goes on both gaps be gradually reduced, its reason can
Can be that graphite tile outer surface infrared emittance is uneven to cause.Fig. 5 represents 450s, Rc=2 × 10-3(m2·℃)/W
Time, experiment and calculated experimental piece hull-skin temperature cloud charts, both are substantially the same (4 as seen from the figure
Number both graphite tiles gap is relatively big, and reason is compared with other graphite tiles, No. 4 graphite tile outer surface roughness
Different, this makes its infrared emittance different, and then makes infrared camera record temperature deviation relatively
Greatly).In conjunction with Fig. 4 and Fig. 5, it is judged that graphite tile and chromium-zirconium-copper heat sink between thermal contact resistance be 2 × 10-3(m2·℃)/W。
Claims (1)
1. the lossless detection method using infrared camera detection part interior contact thermal resistance, it is characterised in that: comprise the following steps:
(1), by the experimental piece inner loop with cooling structure it is passed through hot and cold water, and uses infrared temperature-test technology record experimental piece outer surface real-time infrared image, record its temperature evolution process in time；
(2), based on finite element Transient Thermal Analysis method, the operating mode of step (1) described experimental piece is carried out numerical simulation, obtain experimental piece computation model hull-skin temperature evolution process in time according to simulation result, and preset the initial value of a thermal contact resistance；
(3), the thermal contact resistance described in set-up procedure (2), obtain the evolution process of experimental piece hull-skin temperature under the conditions of different thermal contact resistance, the evolution process result that this simulation result and step (1) record being analyzed, the thermal contact resistance corresponding time identical of both results is this experimental piece interior contact thermal resistance.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966472A (en) * | 2017-12-05 | 2018-04-27 | 中国空气动力研究与发展中心计算空气动力研究所 | A kind of lossless method for fast measuring of high temperature contact thermal resistance |
| CN108535313A (en) * | 2018-02-11 | 2018-09-14 | 中国矿业大学 | A method of with interface resistance between heat-pole method two solids of measurement |
| CN108828003A (en) * | 2018-06-09 | 2018-11-16 | 安徽华兴车辆有限公司 | A kind of solid material thermal contact resistance measuring device and measuring method |
| CN109839406A (en) * | 2019-03-27 | 2019-06-04 | 桂林电子科技大学 | A kind of high precision measurement method of interface contact heat resistance |
| CN109996036A (en) * | 2019-03-18 | 2019-07-09 | 合肥工业大学 | Image Acquisition and high speed processing Transmission system and method for tokamak |
| CN113063501A (en) * | 2021-04-12 | 2021-07-02 | 华中科技大学 | Thermal radiation diagnosis system and method based on double photoelectric detectors |
| WO2022168191A1 (en) * | 2021-02-03 | 2022-08-11 | 三菱電機株式会社 | Defect inspection device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966472A (en) * | 2017-12-05 | 2018-04-27 | 中国空气动力研究与发展中心计算空气动力研究所 | A kind of lossless method for fast measuring of high temperature contact thermal resistance |
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| CN108535313A (en) * | 2018-02-11 | 2018-09-14 | 中国矿业大学 | A method of with interface resistance between heat-pole method two solids of measurement |
| CN108535313B (en) * | 2018-02-11 | 2021-01-29 | 中国矿业大学 | Method for measuring interface thermal resistance between two solids by hot wire method |
| CN108828003A (en) * | 2018-06-09 | 2018-11-16 | 安徽华兴车辆有限公司 | A kind of solid material thermal contact resistance measuring device and measuring method |
| CN109996036A (en) * | 2019-03-18 | 2019-07-09 | 合肥工业大学 | Image Acquisition and high speed processing Transmission system and method for tokamak |
| CN109996036B (en) * | 2019-03-18 | 2020-12-11 | 合肥工业大学 | Image acquisition and high-speed processing transmission method for tokamak |
| CN109839406A (en) * | 2019-03-27 | 2019-06-04 | 桂林电子科技大学 | A kind of high precision measurement method of interface contact heat resistance |
| WO2022168191A1 (en) * | 2021-02-03 | 2022-08-11 | 三菱電機株式会社 | Defect inspection device |
| CN113063501A (en) * | 2021-04-12 | 2021-07-02 | 华中科技大学 | Thermal radiation diagnosis system and method based on double photoelectric detectors |
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Application publication date: 20160928 |