CN106872064B - A kind of test device of turbine outlet section gas temperature field - Google Patents

A kind of test device of turbine outlet section gas temperature field Download PDF

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Publication number
CN106872064B
CN106872064B CN201710135732.5A CN201710135732A CN106872064B CN 106872064 B CN106872064 B CN 106872064B CN 201710135732 A CN201710135732 A CN 201710135732A CN 106872064 B CN106872064 B CN 106872064B
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temperature
thermometric
turbine outlet
net
test
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CN106872064A (en
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马朝臣
郭凯
曲荀之
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Beijing Institute of Technology BIT
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Beijing Institute of Technology BIT
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01KMEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077Imaging

Abstract

The present invention relates to a kind of test devices of turbine outlet section gas temperature field, belong to field of power machinery technology.Including turbocharger, indirect thermometric net, correction thermocouple, thermal infrared imager and corresponding connecting line and route;The available turbine outlet section gas temperature information of indirect thermometric net;The temperature field information of indirect thermometric net can be obtained in thermal infrared imager --- turbine outlet section gas temperature field information;Correction thermocouple is for checking technics of temperature measurement precision with infrared thermal imager.Test device of the present invention is scientific and reasonable, easy to accomplish, reliable and stable, and measurement accuracy is high, can measure turbine outlet section gas temperature field, the turbine isentropic efficiency obtained with this temperature measuring equipment is more accurate, is of great significance to the acquisition of turbine characteristic.

Description

A kind of test device of turbine outlet section gas temperature field
Technical field
The present invention relates to a kind of test devices of turbine outlet section gas temperature field, belong to field of power machinery technology.
Background technique
Turbocharger pushes turbine to do work using I. C. engine exhaust energy, increases inlet pressure of internal combustion engines, thus in making Combustion engine power improves, fuel consumption rate and exhaust pollution reduce, and the performance of internal combustion engine is made to be greatly improved.With calculating Hydromechanical development, although can be designed according to the performance parameter of design conditions engine it is high performance, with engine phase The turbocharger matched still finally must be by testing the performance data for measuring compressor and turbine to verify design just True property obtains the optimal type of performance to modify to design.
By turbine test turbine characteristic curve obtained, it can not only judge whether turbine performance parameter meets its pneumatic property The index of energy, moreover it is possible to reflect the production technology quality of turbine to a certain extent, provide technology to improve turbocharger performance Foundation.It is the turbocharged engine apolegamy indispensable technical conditions of booster.Turbine performance test maximum difficult point be Obtain the isentropic efficiency characteristic of turbine.According to the calculation formula of turbine isentropic efficiency, if turbine disengaging gas can be measured Temperature drop, can directly find out its isentropic efficiency, obtain turbine isentropic efficiency characteristic.In general, turbine inlet temperature (TIT) is easy measurement, Because taking technical measures that its import section gas temperature can be made uniform, meet the requirement of measuring accuracy.And turbine outlet is general There are very strong eddy flow and inhomogeneities, temperature is different everywhere in exit gas same section, it is difficult to its outlet temperature is accurately measured, So generally directly measurement turbine does not pass in and out the temperature drop of gas, but passes through in existing turbine isentropic efficiency attribute testing Various dynamometer machines or indirect measurement method obtain the practical expansion work of turbine, to calculate turbine isentropic efficiency.But due to The revolving speed of booster is relatively high, generally reaches per minute more than ten or even twenties0000 turns, and dynamometer machine is difficult to meet so high turn Speed requires, so that this dynamometer machine involves great expense, and needs to do biggish change to the structure of booster and support in test Dynamic, the test period is long;On the other hand, the mechanical loss in test process is also difficult to estimate.These disadvantages make this survey The turbine isentropic efficiency precision that method for testing obtains is not high.Existing turbine outlet thermometry be using thermocouple come It measures, but this measurement method can only measure the temperature of turbine outlet certain point, be unable to measure out whole cross section Gas temperature, the isentropic efficiency of turbine cannot be also calculated using its data.Although can be with by using multiple thermocouples Turbine outlet section multi-point temperature is measured, but measuring point is limited after all, and can make due to having used more thermocouples The thermodynamic state of turbine outlet changes, and temperature-measuring results is made to generate large error.Due to above, at present both at home and abroad not There is the test device that can accurately measure turbine outlet section gas temperature field.
Summary of the invention
It involves great expense and problem that measuring accuracy is not high, provides the purpose of the present invention is to solve prior-art devices A kind of test device of turbine outlet section gas temperature field, the device are used to obtain the isentropic efficiency of turbine, obtain turbine effect Rate characteristic.
The purpose of the present invention is what is realized by following technical solution.
A kind of test device measuring turbine outlet section gas temperature field, comprising: indirect thermometric net, correction thermocouple, Thermometric mirror, thermal infrared imager, thermometric bend pipe.
The indirect thermometric net is formed by metal wire knitted;Consolidation has high-termal conductivity, high-incidence at the node of wire Penetrate the particle of rate.
The wire is high temperature resistant and the poor wire of thermal conductivity.
The high temperature refers to that temperature is 700-800 DEG C;Thermal conductivity is poor to refer to that material thermal conductivity is less than 20W/m.K;
The wire includes: nickel wire, chromium wire, nichrome wire or manganese chromium alloy wire;
The particle with high-termal conductivity, high emissivity, high-termal conductivity refers to that thermal coefficient is higher than 460W/m.K, high-incidence The rate of penetrating refers to that emissivity is higher than 0.85;
The particle includes: carbon silicon particle, carbon particle or nickel oxide particle;
Connection relationship: thermometric bend pipe and turbine outlet piping connection;Junction is provided with indirect thermometric net;Indirect thermometric net It is fixedly connected with pipeline;Correction thermocouple is placed in thermometric bend pipe, and close with indirect thermometric net;The turning side of thermometric bend pipe Through-hole is opened up on wall, through hole is equipped with thermometric mirror;Thermal infrared imager collects the red of entire thermometric net indirectly by thermometric mirror Outer image;
It corrects and has scale on thermal resistance, to guarantee that measuring point and the indirect thermometric net particle of correction thermal resistance are located at same half At diameter;
The measuring point of correction thermal resistance is located at indirect thermometric net center.
The material of thermometric mirror uses quartz glass, organic glass, tempered glass or titanizing glass;
Test method: after turbine stable operation, reach thermal balance, indirect thermometric to indirect thermometric net and turbine outlet When net temperature is stable and identical as turbine outlet temperature, the visual field of thermal infrared imager is adjusted, the survey of thermal infrared imager is carried out Temperature focusing, the picture made are clearly reliable.At this point, being utilized respectively thermal infrared imager and thermocouple measures turbine outlet Temperature signal, and the temperature signal that thermocouple measures and the temperature field signal that thermal infrared imager measures are uploaded into PC Temperature Treatment End is compared, and realizes that the amendment for measuring temperature information to thermal infrared imager is checked.Finally, the infrared temperature after amendment is checked Degree field information is calculated by PC data processing software, obtains the mean temperature of infrared temperature field.
Beneficial effect
1, compared with the point for measuring turbine outlet temperature by multiple thermocouples in the past measures experimental rig, this dress The influence that can reduce temperature measuring equipment to exit gas flow regime is set, and enough multiple spots of entire outlet can be measured Profiling temperatures belong to planar survey, and the temperature information measured is accurate more many than traditional thermoelectricity pair-point measurement.
2, using thermocouple measurement feature with high accuracy, thermal infrared imager is modified, can be completed to thermometric information Amendment, improve the precision of temperature-measuring results.
3, with the method for generalling use dynamometer machine or indirect measurement of power come compared with calculating turbine isentropic efficiency, the present apparatus can be with Turbine outlet temperature is directly measured, turbine is obtained and imports and exports the gas temperature difference, it is more accurate to calculate resulting isentropic efficiency, and And eliminate the influence of bearing arrangement mechanical loss.
4, measuring device structure is simple, easy to accomplish, reliable and stable, and measurement accuracy is high, significantly reduces experimentation cost.
Detailed description of the invention
Fig. 1 is gas temperature field test device schematic diagram in turbine outlet section of the present invention;
Fig. 2 is thermocouple of the present invention and thermometric net installation site relationship;
Fig. 3 is present invention thermometric host's view indirectly;
Fig. 4 is present invention thermometric net side view indirectly.
Wherein, 1- compressor, 2- turbine, the indirect thermometric net of 3-, 4- correction thermocouple, 5- thermometric mirror, 6- thermal infrared imager, 7- thermometric bend pipe.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing and specific implementation method Technical solution of the present invention is described in further detail.
Embodiment 1
A kind of test method measuring turbine outlet section gas temperature field, specific structure includes: turbocharger, indirectly Thermometric net 3 corrects thermocouple 4, thermometric mirror 5, thermal infrared imager 6, thermometric bend pipe 7.
Indirect thermometric net 3 is made of nichrome silk screen and carbon silicon materials particle, and carbon silicon materials Particle consolidation is closed in nickel chromium triangle On spun gold mesh point.Nichrome wire surface oxidation-resistant is good, and temperature level is high, and has higher intensity at high temperature, has Good processing performance, and its thermal resistance is larger, and heating conduction is poor, it is possible to reduce the heat transfer between neighbor mesh points.Carbon Silicon materials particle emissivity with higher, heat-radiating properties are good, and thermal conductivity is good, quick heating, and thermal infrared imager can be made more preferable Quickly capture temperature field information.Indirect thermometric net is fixed between two flanges, and is lined between thermometric net and flange Heat insulating mattress reduces heat transfer of the thermometric net to flange.
Correction thermocouple: thermocouple is arranged on a thermometric net section as close as possible, according on correction thermocouple Scale, the depth of adjustment correction thermocouple insertion pipeline, can measure the temperature of several characteristic points of gas cross section, realizes to infrared heat As the check of instrument thermometric information.
Thermometric mirror: it is mounted on the turbine outlet bend pipe with light transmission device of turbine outlet thermometric trip appropriate location off the net Place.
Thermal infrared imager: thermal infrared imager is placed on suitable position after thermometric mirror, keeps measurement gained temperature field image clear Reliably.Thermal infrared imager temperature measurement accuracy with higher and sensitivity of thermometry, can accurately capture change of temperature field.
The turbocharger is made of compressor 1 and turbine 2;
Connection relationship: thermometric bend pipe 7 is connect with 2 export pipeline of turbine;Junction is provided with indirect thermometric net 3;It surveys indirectly Wembledon tennis open competition 3 is fixedly connected with pipeline;Correction thermocouple 4 is placed in thermometric bend pipe 7, and close with indirect thermometric net 3;Thermometric bend pipe 7 Turning side wall on open up through-hole, through hole is equipped with thermometric mirror 5, convenient for observation;Thermal infrared imager 6 is adopted by thermometric mirror 5 Collect the infrared image of entire thermometric net 3 indirectly;
A kind of test method of turbine outlet section gas temperature field, steps are as follows for specific execution:
Step 1: the preparation before thermometric
Suitable 6 resolution of lens of thermal infrared imager is selected according to the grid number of indirect thermometric net 3, selects suitable temperature Processing software and algorithm.
Step 2: thermometric focusing
External air source is connected, driving gas is provided to the turbine 2 of temperature measuring equipment, turbine 2 is made to bring into operation.It is steady to turbine 2 After fixed operation a period of time, the distance between thermal infrared imager 6 and thermometric mirror 5 are adjusted, and image pair is carried out to thermal infrared imager 6 The temperature visual field of coke, the thermal infrared imager 6 made is clearly reliable.
Step 3: thermometric process
2 continuous service of turbine makes indirect thermometric net 3 reach thermal balance, indirect 3 temperature of thermometric net with 2 exit gas of turbine It is identical as 2 Outlet Gas Temperature of turbine.The indirect thermometric net 3 of 6 face of thermal infrared imager for completion of having focused is measured, will be surveyed The temperature signal taken uploads to the end PC.It corrects thermocouple 4 simultaneously and also measures and obtained the temperature of several characteristic points of 2 exit gas of turbine Degree, also uploads to the end PC for the temperature signal measured.
Step 3: temperature is checked and processing
At the end PC, the temperature that several section feature point temperature informations and thermal infrared imager 6 that correction thermocouple 4 measures are measured Degree field information is compared, and realizes the amendment in the temperature field measured to thermal infrared imager 6.By revised infrared temperature field information It is input to Temperature Treatment software, the mean temperature in temperature field is obtained by calculation, this temperature is turbine outlet temperature.

Claims (10)

1. it is a kind of measure turbine outlet section gas temperature field test device, it is characterised in that: including indirect thermometric net (3), Correct thermocouple (4), thermometric mirror (5), thermal infrared imager (6) and thermometric bend pipe (7);
The indirect thermometric net (3) is formed by metal wire knitted;Consolidation has high-termal conductivity, high emission at the node of wire The particle of rate;
Thermometric bend pipe (7) is connect with turbine (2) export pipeline;Junction is provided with indirect thermometric net (3);Indirect thermometric net (3) It is fixedly connected with pipeline;Correction thermocouple (4) is placed in thermometric bend pipe (7), and close with indirect thermometric net (3);Thermometric bend pipe (7) through-hole is opened up on turning side wall, through hole is equipped with thermometric mirror (5);Thermal infrared imager (6) is adopted by thermometric mirror (5) Collect the infrared image of entire thermometric net (3) indirectly.
2. a kind of test device for measuring turbine outlet section gas temperature field as described in claim 1, it is characterised in that: institute Stating wire is high temperature resistant and the poor wire of thermal conductivity.
3. a kind of test device for measuring turbine outlet section gas temperature field as claimed in claim 2, it is characterised in that: institute It states high temperature and refers to that temperature is 700-800 DEG C;Thermal conductivity is poor to refer to that material thermal conductivity is less than 20W/m.K.
4. a kind of test device for measuring turbine outlet section gas temperature field as claimed in claim 1 or 2, feature exist In: the wire is nickel wire, chromium wire, nichrome wire or manganese chromium alloy wire.
5. a kind of test device for measuring turbine outlet section gas temperature field as described in claim 1, it is characterised in that: institute The high-termal conductivity for stating particle refers to that thermal coefficient is higher than 460W/m.K, and high emissivity refers to that emissivity is higher than 0.85.
6. a kind of test device for measuring turbine outlet section gas temperature field as claimed in claim 1 or 5, feature exist In: the particle is carbon silicon particle, carbon particle or nickel oxide particle.
7. a kind of test device for measuring turbine outlet section gas temperature field as described in claim 1, it is characterised in that: institute It states in correction thermocouple (4) with scale.
8. a kind of test device for measuring turbine outlet section gas temperature field as claimed in claim 1 or 7, feature exist In: the measuring point of correction thermocouple (4) is located at indirect thermometric net (3) center.
9. a kind of test device for measuring turbine outlet section gas temperature field as described in claim 1, it is characterised in that: survey The material of Wen Jing (5) uses quartz glass, organic glass, tempered glass or titanizing glass.
10. a kind of test of measurement turbine outlet section gas temperature field as described in claims 1 or 2 or 3 or 5 or 7 or 9 fills It sets, it is characterised in that: the test method of described device are as follows: after turbine stable operation, to indirect thermometric net and turbine outlet Reach thermal balance and adjust the visual field of thermal infrared imager when indirect thermometric net temperature is stable and identical as turbine outlet temperature, The thermometric focusing of thermal infrared imager is carried out, the picture made is clearly reliable;At this point, being utilized respectively thermal infrared imager and correction heat Galvanic couple measures the temperature signal of turbine outlet, and will correct what the temperature signal that thermocouple measures was measured with thermal infrared imager Temperature field signal uploads to PC Temperature Treatment end and is compared, and realizes that the amendment for measuring temperature information to thermal infrared imager is checked; Finally, the infrared temperature field information after amendment is checked is calculated by PC data processing software, infrared temperature field is obtained Mean temperature.
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CN109238473B (en) * 2018-11-02 2020-08-11 汕头大学 Device and method for calibrating dust interference of infrared image array sensor
CN111413099B (en) * 2020-03-24 2021-03-16 武汉理工大学 Verification device for temperature measuring method of inner wall surface of heated part of engine

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CN101936775A (en) * 2010-07-27 2011-01-05 中国计量学院 Combined measuring device and method for air outlet temperature filed of wind tube
CN103459996A (en) * 2011-02-09 2013-12-18 西门子能量股份有限公司 Apparatus and method for temperature mapping a turbine component in a high temperature combustion environment
CN103422915A (en) * 2012-05-15 2013-12-04 通用电气公司 Systems and methods for active temperature control in steam turbine
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