CN116026478B - Radiation temperature measurement calibration device and method for gas turbine cold effect experiment - Google Patents
Radiation temperature measurement calibration device and method for gas turbine cold effect experiment Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The invention discloses a radiation temperature measurement calibration device and method for a gas turbine cold effect experiment, and belongs to the technical field of gas turbine testing. The calibration device comprises an L-shaped positioning plate, an infrared temperature measuring device carried on the horizontal plane of the L-shaped positioning plate and a thermocouple temperature measuring device carried on the vertical plane; the calibration method comprises the following steps: s1, placing a test piece, S2, placing a thermal infrared imager, S3, fine adjusting the height and the focal length, S4, heating and testing, S5 and analyzing data. The calibration device has a simple integral structure, is convenient to use, provides a larger visual field and a larger range of variation of distance coefficients, and is suitable for testing gas turbines with different sizes; the calibration method is used for collecting real-time data of the test piece, is simple in calibration process, convenient to operate and capable of obtaining high-accuracy temperature data, and can obtain an infrared calibration formula of the test piece in an experimental temperature range.
Description
Technical Field
The invention relates to the technical field of gas turbine tests, in particular to a radiation temperature measurement calibration device and method for a gas turbine cold effect experiment.
Background
All objects with a temperature higher than absolute zero continuously emit infrared radiation energy to the surrounding space, the size of the infrared radiation energy is determined by the infrared radiation characteristics of the object, and the surface temperature of the object can be accurately measured by measuring the infrared radiation energy emitted by the object. In the temperature range of radiation temperature measurement, the infrared band covers the optimal working wavelength. The infrared thermal image measuring method has the advantages of wide temperature measuring range and wide measuring distance due to high sensitivity, can measure the temperature of a rotating object and a high-speed moving object, and is gradually used in the temperature measuring experimental study of the turbine blade and the wall surface of the combustion chamber of the gas turbine. In the experimental process, the emissivity, the distance coefficient and the field of view can influence the accuracy of infrared temperature measurement, wherein the emissivity is related to the material temperature, the surface roughness and the surface treatment mode, so that the acquisition of the real temperature value of the test piece under different working conditions has important significance in the process of utilizing the infrared thermal image temperature measurement technology.
The real temperature value of the object can be obtained by measuring the infrared emissivity and converting the infrared temperature, and the method mainly comprises the steps of indirectly measuring the band emissivity by adopting an infrared spectrometer and directly measuring the band emissivity of the object by adopting a thermal imager, wherein the specific operations of the band emissivity mainly comprise a direct measurement method, a double reference method, a double temperature measurement method and the like. The method has the problems of higher cost or complex implementation method in the experimental study of the gas turbine. The commonly adopted double-reference method is shown in a calculation formula The accurate value of n is needed to be obtained, the value of the n is different along with the change of the response wave band of the thermal imager, and a certain value range of n can be obtained only for a specific wave band, so that a large error still exists.
Therefore, the existing infrared temperature measurement calibration implementation method in the field of gas turbine test has the problems of complex structure or method, higher cost, low accuracy and the like.
Disclosure of Invention
Therefore, the invention provides a radiation temperature measurement calibration device and a radiation temperature measurement calibration method for a gas turbine cold effect experiment, which aim to solve or at least alleviate at least one of the problems.
According to one aspect of the invention, a gas turbine cold efficiency experiment radiation temperature measurement calibration device is provided, and comprises an L-shaped positioning plate, an infrared temperature measurement unit and a thermocouple temperature measurement unit; the infrared temperature measurement unit comprises an infrared thermal imager, an infrared thermal imager bracket and a processing module; the thermal infrared imager is carried on the thermal infrared imager bracket and is connected with the processing module through a data transmission line; the thermocouple temperature measurement unit comprises a heating subunit and a collecting subunit, wherein the heating subunit comprises a long bolt, a long nut, a lower flange, a glass fiber insulation sleeve, a heat conduction block, a thermocouple, a heating rod, infrared quartz glass, a graphite gasket and an upper flange, and the collecting subunit comprises a temperature data collecting device, a contact voltage regulator and a display screen; the long bolt is matched with the long nut to tightly press the lower flange, the glass fiber heat insulation sleeve and the upper flange, the heat conducting block is arranged inside the glass fiber heat insulation sleeve, a test piece, infrared quartz glass and a graphite gasket are arranged between the heat conducting block and the upper flange from bottom to top, and the temperature acquisition device is connected with the thermocouple through a wire and is connected with the display screen through a data transmission line.
Further, the L-shaped positioning plate comprises a vertical surface and a horizontal surface, wherein the vertical surface is used for carrying a heating subunit of the thermocouple temperature measurement unit, and the horizontal surface is used for carrying the infrared temperature measurement unit; the distance between the thermocouple temperature measuring unit and the horizontal plane of the L-shaped locating plate is adjusted by selecting the position of a locating hole on the vertical surface of the L-shaped locating plate, and the distance and the angle between the thermal infrared imager and the test piece are adjusted by selecting the position of the locating hole on the horizontal plane of the L-shaped locating plate, so that the distance and the angle between the thermal infrared imager and the test piece are matched with the actual distance and the angle under the specific experimental working condition.
Further, the thermocouple 3-6 and the heating rod 3-7 in the device are detachable components, and the test piece 3-8 is detachably mounted in the device.
Further, the bottom surface of the infrared quartz glass 3-9 is in contact with the top surface of the test piece 3-8, and the top surface of the infrared quartz glass 3-9 is in contact with the graphite gasket 3-10; the infrared quartz glass 3-9 is used for absorbing infrared radiation in a predetermined band range and filtering out radiation outside the predetermined band range.
Further, the L-shaped positioning plate 1 is respectively connected with the infrared temperature measuring unit 2 and the thermocouple temperature measuring unit 3 through positioning holes on the horizontal plane and the vertical plane of the L-shaped positioning plate; the thermal infrared imager bracket 2-2 is fixed on the horizontal plane of the L-shaped positioning plate 1 through a positioning hole on the horizontal plane of the L-shaped positioning plate 1.
Further, the long bolts and the long nuts are in N groups, and the N groups of long bolts and the long nuts are distributed at N matching holes of the lower flange, the glass fiber insulation sleeve and the upper flange, wherein N is a positive integer.
Further, n=6, 6 groups of long bolts and long nuts are distributed at the first, second, third, fourth, fifth and sixth mating holes; the lower flange, the glass fiber insulation sleeve and the upper flange are respectively provided with a first side, a second side, a third side and a fourth side which are corresponding to each other, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side; the first mating hole and the second mating hole are located on the first side, the third mating hole is located on the second side, the fourth mating hole and the fifth mating hole are located on the third side, and the sixth mating hole is located on the fourth side.
Further, the shape of the outer surface of the bottom of the heat conducting block is the same as the shape of the inner surface of the glass fiber insulation sleeve, a plurality of round holes are uniformly arranged in the bottom of the heat conducting block and used for installing the heating rod, the shape and the size of the contact surface of the heat conducting block and the test piece are the same, and a plurality of holes are uniformly arranged on two sides of the protruding part of the heat conducting block and used for arranging the thermocouple.
Further, the heating rods are respectively inserted into round holes at the bottoms of the heat conducting blocks, and are connected with the contact voltage regulator through wires, the contact voltage regulator is connected with a power supply, and M is a positive integer.
According to another aspect of the invention, there is also provided a calibration method of a radiation temperature measurement calibration device for a gas turbine cold efficiency experiment, comprising the following steps: step S1, a test piece to be tested is contacted with a graphite gasket and placed in a groove of an upper flange, the upper flange, a glass fiber insulation sleeve and a lower flange are fastened by utilizing the cooperation of a long bolt and a long nut, and then a thermocouple temperature measuring unit is fixed on a vertical surface of an L-shaped locating plate; s2, placing the thermal infrared imager on a thermal infrared imager bracket; s3, adjusting the height of the support of the thermal infrared imager so that the center of the lens of the thermal infrared imager and the horizontal plane of the L-shaped locating plate opposite to the center of the test piece are at the same height, displaying the test piece in the center of the infrared image, and adjusting the focal length of the camera so that the display image is in a clear state; step S4, connecting the contact voltage regulator with a power supply, connecting a heating rod with the contact voltage regulator, regulating the output voltage of the contact voltage regulator to control the temperature of a test piece, observing the temperature measured by 12 thermocouples on a display screen, judging that the test piece reaches heat balance when the thermocouple temperature reaches the vicinity of the marking temperature and the temperature change amount of 12 measuring points is not more than 1K within 10 minutes, simultaneously intercepting infrared images and the thermocouple temperature sixteen times continuously, and timely disconnecting the power supply connected with the contact voltage regulator when the thermocouple temperature reaches the highest marking temperature; and S5, respectively obtaining sixteen groups of infrared images and sixteen groups of measuring point thermocouple temperatures near different marking temperatures through the step S4, analyzing the infrared images to obtain surface distribution data of the temperature of the test piece, respectively carrying out average treatment on each group of temperature data, and then carrying out fitting treatment to obtain a corresponding relation between the infrared temperature and the real temperature under the specific experimental working condition.
The radiation temperature measurement calibration device and method for the gas turbine cold effect experiment have the advantages of simple structure, lower cost, higher measurement accuracy, simple technology assembly and convenient use.
The radiation temperature measurement calibration device and method for the gas turbine cold effect experiment can realize at least one of the following effects: (1) The radiation temperature measurement calibration platform for the cold efficiency experiment is provided with the L-shaped positioning plate, and a larger visual field and a larger range of range coefficient variation can be obtained through matching of round holes on the L-shaped positioning plate with bolts and nuts, so that the cold efficiency experiment requirements of different gas turbines are met. (2) The cooling effect experiment radiation temperature measurement calibration platform has the advantages of simple integral structure, convenient use, capability of quickly replacing the test piece, the heating core, the thermocouple and other consumable materials, and effective improvement of experiment efficiency. (3) The cold effect experiment radiation temperature measurement calibration method disclosed by the invention is used for carrying out the averaging treatment on a large amount of data on each marked temperature point, so that the data accuracy of the test temperature can be improved, and the accuracy of a fitting formula is ensured.
Drawings
To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which set forth the various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to fall within the scope of the claimed subject matter. The above, as well as additional objects, features, and advantages of the present disclosure will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. Like reference numerals generally refer to like parts or elements throughout the present disclosure.
FIG. 1 is a schematic diagram showing the structure of a radiation temperature measurement calibration device for a gas turbine cold efficiency experiment according to an embodiment of the invention;
fig. 2 is a schematic view showing the structure of an L-shaped positioning plate;
FIG. 3 is a schematic view showing the structure of a heating subunit in the thermocouple temperature measurement unit;
FIG. 4 is a schematic view showing the structure of the upper flange;
fig. 5 is a schematic view showing the structure of the heating block;
FIG. 6 is a schematic diagram illustrating some of the components of FIG. 1;
FIG. 7 is a flow chart illustrating a calibration method of a gas turbine cold efficiency experiment radiation temperature measurement calibration apparatus according to an embodiment of the present invention.
In the figure: the infrared thermal imaging system comprises an L-shaped positioning plate 1, an infrared temperature measuring unit 2, an infrared thermal imaging system 2-1, an infrared thermal imaging system bracket 2-2, a processing module 2-3, a thermocouple temperature measuring unit 3, a long bolt 3-1, a long nut 3-2, a lower flange 3-3, a glass fiber insulation sleeve 3-4, a heat conducting block 3-5, a heat conducting block protruding part 3-5-1, a thermocouple 3-6, a heating rod 3-7, a test piece 3-8, infrared quartz glass 3-9, a graphite gasket 3-10, an upper flange 3-11, a first matching hole 3-11-1, a second matching hole 3-11-2, a third matching hole 3-11-3, a fourth matching hole 3-11-4, a fifth matching hole 3-11-5, a sixth matching hole 3-11-6, a temperature acquisition device 3-12, a contact 3-13 and a display screen 3-14.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Exemplary apparatus
The embodiment of the invention provides a radiation temperature measurement calibration device for a gas turbine cold effect experiment, which comprises an L-shaped positioning plate, an infrared temperature measurement unit and a thermocouple temperature measurement unit; the infrared temperature measurement unit comprises an infrared thermal imager, an infrared thermal imager bracket and a processing module; the thermal infrared imager is carried on the thermal infrared imager bracket and is connected with the processing module through a data transmission line; the thermocouple temperature measurement unit comprises a heating subunit and a collecting subunit, wherein the heating subunit comprises a long bolt, a long nut, a lower flange, a glass fiber insulation sleeve, a heat conduction block, a thermocouple, a heating rod, infrared quartz glass, a graphite gasket and an upper flange, and the collecting subunit comprises a temperature data collecting device, a contact voltage regulator and a display screen; the long bolt is matched with the long nut to tightly press the lower flange, the glass fiber heat insulation sleeve and the upper flange, the heat conducting block is arranged inside the glass fiber heat insulation sleeve, a test piece, infrared quartz glass and a graphite gasket are arranged between the heat conducting block and the upper flange from bottom to top, and the temperature acquisition device is connected with the thermocouple through a wire and is connected with the display screen through a data transmission line.
FIG. 1 shows a schematic structural diagram of a radiation temperature measurement calibration device for a cooling effect experiment of a gas turbine according to one embodiment of the invention.
The radiation temperature measurement calibration device for the gas turbine cold effect experiment comprises an L-shaped positioning plate 1, an infrared temperature measurement unit 2 and a thermocouple temperature measurement unit 3.
As shown in fig. 1, the infrared temperature measuring unit 2 comprises an infrared thermal imager 2-1, an infrared thermal imager bracket 2-2 and a processing module 2-3; the thermal infrared imager 2-1 is carried on the thermal infrared imager bracket 2-2 and is connected with the processing module 2-3 through a data transmission line.
The processing module 2-3 may be implemented, for example, by a computer, or may be implemented by a computing device or processing device having a display screen, or may be implemented by the display screen 3-14 described below. The processing module 2-3 may comprise, for example, a memory sub-module.
The L-shaped positioning plate 1 comprises two plates, for example a first plate and a second plate. The connection between the first plate and the second plate is for example fixed or may be a movable connection.
Fig. 2 shows a schematic view of one construction of an L-shaped locating plate. As shown in fig. 2, the L-shaped positioning plate 1 includes, for example, a vertical surface for mounting a heating subunit of the thermocouple temperature measurement unit 3, and a horizontal surface for mounting the infrared temperature measurement unit 2. In this example, for example, one of the two flat plates may be selected as a vertical plane, and the other as a horizontal plane, such that the angle between the two planes is a right angle.
As an example, the distance between the thermocouple temperature measuring unit 3 and the horizontal plane of the L-shaped locating plate 1 can be adjusted by selecting the location of the locating hole of the vertical plane of the L-shaped locating plate 1, and the distance and angle between the thermal infrared imager 2-1 and the test piece 3-8 can be adjusted by selecting the location of the locating hole of the horizontal plane of the L-shaped locating plate 1, so that the distance and angle between the thermal infrared imager 2-1 and the test piece 3-8 are matched with the actual distance and angle under the specific experimental working condition.
In addition, the L-shaped positioning plate 1 can be connected with the infrared temperature measuring unit 2 and the thermocouple temperature measuring unit 3 through positioning holes on the horizontal plane and the vertical plane of the L-shaped positioning plate respectively; the thermal infrared imager bracket 2-2 is fixed on the horizontal plane of the L-shaped locating plate 1 through a locating hole on the horizontal plane of the L-shaped locating plate 1.
Further, as an example, the angle between the two flat plates of the L-shaped positioning plate 1 may be a non-right angle (not shown in the figure), for example, an acute angle or an obtuse angle. In this example, the angle between the two plates may be fixed or adjustable; when the adjustable mode is adopted, the angle between the two flat plates can be fixed at one of a plurality of preset angles, or can be continuously adjusted.
According to an embodiment of the invention, the thermocouple temperature measurement unit 3 comprises, for example, a heating subunit and a collecting subunit.
As shown in fig. 3, the heating subunit includes a long bolt 3-1, a long nut 3-2, a lower flange 3-3, a glass fiber insulation sheath 3-4, a heat conducting block 3-5, a thermocouple 3-6, a heating rod 3-7 (not shown in fig. 3), infrared quartz glass 3-9, a graphite gasket 3-10, and an upper flange 3-11. Furthermore, as shown in FIG. 1, the acquisition subunit includes a temperature data acquisition device 3-12, a contact voltage regulator 3-13, and a display screen 3-14.
The thermocouple 3-6 and the heating rod 3-7 in the above-described apparatus are, for example, detachable components, and the test piece 3-8 may be, for example, detachably mounted in the apparatus.
Referring to fig. 3, a long bolt 3-1 is matched with a long nut 3-2 to tightly press a lower flange 3-3, a glass fiber insulation sleeve 3-4 and an upper flange 3-11, a heat conducting block 3-5 is arranged inside the glass fiber insulation sleeve 3-4, a test piece 3-8, infrared quartz glass 3-9 and a graphite gasket 3-10 are arranged between the heat conducting block 3-5 and the upper flange 3-11 from bottom to top, and a temperature acquisition device 3-12 is connected with a thermocouple 3-6 through a wire and is connected with a display screen 3-14 through a data transmission line.
As an example, the long bolts 3-1 and the long nuts 3-2 are, for example, N groups in total, and the N groups of the long bolts 3-1 and the long nuts 3-2 are distributed at N fitting holes of each of the lower flange 3-3, the glass fiber insulation cover 3-4 and the upper flange 3-11, wherein N is a positive integer.
In one example, as shown in FIG. 4, N may be 6 such that 6 sets of long bolts 3-1 and long nuts 3-2 (i.e., each set includes one long bolt and long nut) are distributed at the first mating holes 3-11-1, the second mating holes 3-11-2, the third mating holes 3-11-3, the fourth mating holes 3-11-4, the fifth mating holes 3-11-5, and the sixth mating holes 3-11-6.
The lower flange 3-3, the glass fiber insulation sleeve 3-4 and the upper flange 3-11 are respectively provided with a first side, a second side, a third side and a fourth side, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side.
The first fitting hole 3-11-1 and the second fitting hole 3-11-2 are located, for example, on a first side, the third fitting hole 3-11-3 is located, for example, on a second side, the fourth fitting hole 3-11-4 and the fifth fitting hole 3-11-5 are located, for example, on a third side, and the sixth fitting hole 3-11-6 is located, for example, on a fourth side.
As an example, the shape of the outer surface of the bottom of the heat conducting block 3-5 is the same as the shape of the inner surface of the glass fiber insulation sleeve 3-4, for example, a plurality of round holes are uniformly arranged in the bottom of the heat conducting block 3-5 for installing the heating rod 3-7, and the shape and the size of the contact surface of the heat conducting block 3-5 and the test piece 3-8 are the same.
The number of the round holes can be equal to the number of the inserted heating rods 3-7, or can be more than the number of the inserted heating rods 3-7.
Under the condition that the number of the round holes is larger than that of the inserted heating rods 3-7, namely the round holes are not fully inserted, round holes at corresponding positions can be selected to be inserted into the heating rods according to local heating requirements, and round holes at other positions can be left empty, so that the relative heating speed can be controlled according to different heating rod numbers, and the actually needed heating position can be controlled.
Fig. 5 shows one possible structure of the heating block 5.
As shown in fig. 5, a plurality of holes are uniformly arranged on both sides of the protrusion 3-5-1 of the heat conduction block 3-5 for arranging the thermocouples 3-6. For example, in the example shown in fig. 5, 6 holes, i.e., 12 holes in total, are uniformly arranged on both sides of the protruding portion 3-5-1 of the heat conductive block 3-5, and 12 thermocouples 3-6 may be inserted.
As an example, the heating rods 3-7 are M in number, are respectively inserted into round holes at the bottoms of the heat conducting blocks 3-5, and are connected with the contact voltage regulator 3-13 through wires, and the contact voltage regulator 3-13 is connected with a power supply. Wherein M is a positive integer.
In the example shown in fig. 5, 8 circular holes (as an example of a plurality of circular holes) are uniformly arranged inside the bottom of the heat conduction block 3-5, and 1-8 heating rods 3-7 can be inserted as needed; for example, 6 heating rods 3-7 may be inserted for heating, while the other two are left empty.
For ease of understanding, FIG. 6 shows an isolated view of a portion of the components of the above-described gas turbine cold efficiency experiment radiation thermometry calibration apparatus. As shown in fig. 6, according to the embodiment of the present invention, the bottom surface of the infrared quartz glass 3-9 is in contact with, for example, the top surface of the test piece 3-8, and the top surface of the infrared quartz glass 3-9 is in contact with the graphite gasket 3-10; the infrared quartz glass 3-9 is intended to absorb infrared radiation in a predetermined band range and to filter out radiation outside the predetermined band range.
Exemplary method
The embodiment of the invention also provides a calibration method of the radiation temperature measurement calibration device for the gas turbine cold effect experiment, which comprises the following steps: step S1, a test piece to be tested is contacted with a graphite gasket and placed in a groove of an upper flange, the upper flange, a glass fiber insulation sleeve and a lower flange are fastened by utilizing the cooperation of a long bolt and a long nut, and then a thermocouple temperature measuring unit is fixed on a vertical surface of an L-shaped locating plate; s2, placing the thermal infrared imager on a thermal infrared imager bracket; s3, adjusting the height of the support of the thermal infrared imager so that the center of the lens of the thermal infrared imager and the horizontal plane of the L-shaped locating plate opposite to the center of the test piece are at the same height, displaying the test piece in the center of the infrared image, and adjusting the focal length of the camera so that the display image is in a clear state; step S4, connecting the contact voltage regulator with a power supply, connecting a heating rod with the contact voltage regulator, regulating the output voltage of the contact voltage regulator to control the temperature of a test piece, observing the temperature measured by 12 thermocouples on a display screen, judging that the test piece reaches heat balance when the thermocouple temperature reaches the vicinity of a marking temperature and the temperature change amount of 12 measuring points is not more than 1K (or 1 ℃) within 10 minutes, simultaneously intercepting infrared images and thermocouple temperature for sixteen times continuously, and timely disconnecting the power supply connected with the contact voltage regulator when the thermocouple temperature reaches the highest marking temperature; and S5, respectively obtaining sixteen groups of infrared images and sixteen groups of measuring point thermocouple temperatures near different marking temperatures through the step S4, analyzing the infrared images to obtain surface distribution data of the temperature of the test piece, respectively carrying out average treatment on each group of temperature data, and then carrying out fitting treatment to obtain a corresponding relation between the infrared temperature and the real temperature under the specific experimental working condition.
Fig. 7 shows a flow chart of the calibration method described above.
As shown in fig. 7, in step S1, the test piece is placed, that is: the test piece 3-8 to be tested is contacted with the graphite gasket 3-10 and is placed in the groove of the upper flange 3-11, the glass fiber insulation sleeve 3-4 and the lower flange 3-3 are fastened by utilizing the cooperation of the long bolt 3-1 and the long nut 3-2, the thermocouple temperature measuring unit 3 is fixed on the vertical surface of the L-shaped locating plate 1, and the distance between the thermocouple temperature measuring unit 3 and the horizontal surface of the L-shaped locating plate 1 can be adjusted by selecting the position of a locating hole on the vertical surface of the L-shaped locating plate 1.
Next, in step S2, the thermal infrared imager is placed, that is: the thermal infrared imager 2-1 is arranged on the thermal infrared imager bracket 2-2, and the distance and the angle between the thermal infrared imager 2-1 and the test piece 3-8 can be adjusted by selecting the position of the positioning hole of the horizontal plane of the L-shaped positioning plate 1.
Then, in step S3, fine adjustment of the height and focal length is performed, that is: the infrared image displayed by the processing module 2-3 (for example, comprising a display screen or through the display screen 3-14) is observed, the height of the thermal infrared imager bracket 2-2 is adjusted so that the lens center of the thermal infrared imager 2-1 and the horizontal plane of the L-shaped locating plate 1 corresponding to the center of the test piece 3-8 are positioned at the same height, the test piece 3-8 is displayed at the center of the infrared image, and the focal length of the camera is adjusted so that the displayed image is in a clear state.
Next, in step S4, a heating test is performed, that is: connecting the contact voltage regulator 3-13 with a power supply, connecting the heating rod 3-7 with the contact voltage regulator 3-13, slowly adjusting the output voltage of the contact voltage regulator 3-13 to control the temperature of the test piece 3-8, observing the temperature measured by 12 thermocouples 3-6 on the display screen 3-14, judging that the test piece 3-8 reaches the heat balance when the thermocouple temperature reaches the vicinity of the marking temperature and the temperature change amount of the 12 measuring points is not more than 1K within 10 minutes, simultaneously intercepting the infrared image and the thermocouple temperature sixteen times continuously, and timely disconnecting the power supply connected with the contact voltage regulator 3-13 when the thermocouple temperature reaches the highest marking temperature.
Thus, in step S5, data analysis is performed, that is: sixteen groups of infrared images and sixteen groups of measuring point thermocouple temperatures near different marking temperatures are respectively obtained through the step S4, the infrared images are analyzed through AnalyzIR software to obtain surface distribution data of the temperature of a test piece, after each group of temperature data is respectively subjected to average processing, and then MATLAB is used for fitting processing to obtain a correlation formula between the infrared temperature and the real temperature in a specific experimental working condition range, namely, the corresponding relation between the infrared temperature and the real temperature is obtained.
The radiation temperature measurement calibration device and method for the gas turbine cold efficiency experiment have the advantages of simple integral structure, convenient use, and large visual field and distance coefficient variation range, and are suitable for testing gas turbines with different sizes; the calibration method disclosed by the invention is used for collecting real-time data of the test piece, is simple in calibration process, convenient to operate and capable of obtaining high-accuracy temperature data, and can obtain an infrared calibration formula of the test piece in an experimental temperature range.
Detailed description of preferred embodiments
The following describes a preferred embodiment of the radiation temperature measurement calibration device for the cooling effect experiment of the gas turbine according to the embodiment of the invention.
As shown in fig. 1, the radiation temperature measurement calibration device for the cooling effect experiment of the gas turbine comprises an L-shaped positioning plate, an infrared temperature measurement device (as an example of an infrared temperature measurement unit 2) mounted on the horizontal plane of the L-shaped positioning plate, and a thermocouple temperature measurement device (as an example of a thermocouple temperature measurement unit 3) mounted on the vertical plane.
The infrared temperature measuring device comprises a thermal infrared imager, a thermal infrared imager bracket and a computer (as an example of the processing module 2-3).
The thermocouple temperature measuring device comprises a long bolt, a long nut, a lower flange, a glass fiber insulation sleeve, a heat conducting block, a thermocouple, a heating rod, infrared quartz glass, a graphite gasket, an upper flange, a temperature collecting device, a contact voltage regulator and a display screen.
The L-shaped locating plate is composed of a vertical surface and a horizontal surface, the vertical surface is connected with the thermocouple temperature measuring device, the horizontal surface is connected with the infrared temperature measuring device, R3 locating holes are evenly distributed on two surfaces in an array mode, the transverse distance between circle centers of the locating holes is 20mm, the longitudinal distance between circle centers of the locating holes is 22mm, and a large visual field and a large range of distance coefficient variation can be provided for experiments.
The thermal infrared imager is mounted on a thermal infrared imager bracket and connected with a computer through a data transmission line.
The thermal infrared imager bracket is fixed on the horizontal plane of the L-shaped locating plate through a locating hole on the horizontal plane of the L-shaped locating plate.
The long bolts are used for tightly pressing the lower flange, the glass fiber insulation sleeve and the upper flange by matching with the long nuts, so that the graphite gasket, the infrared quartz glass and the test piece are fixed between the upper flange and the heat conducting block and do not move.
The shape of the inner surface of the glass fiber insulation sleeve is the same as the shape of the outer surface of the bottom of the heat conducting block, so that the outer surface of the bottom of the heat conducting block can be surrounded for blocking or reducing heat transfer between the heat conducting block and external air, the temperature of the heat conducting block is raised faster, and the calibration efficiency is improved.
The heat conducting block is arranged in the glass fiber heat insulating sleeve, 6 round holes are uniformly arranged in the bottom of the heat conducting block and used for installing the heating rod, the shape and the size of the contact surface of the heat conducting block and the test piece are the same, 6 holes with the diameter of 1mm and the depth of 4mm are uniformly arranged on two sides of the protruding part respectively and are used for arranging thermocouples, and the heat conducting block is made of copper materials with good heat conducting performance and can efficiently adjust the temperature of the thermocouples.
The thermocouples are arranged in total of 12, and are connected with a temperature data acquisition device through wires.
Six heating rods are arranged, for example, the heating power is 200W, and the heating rods are inserted from a round hole at the bottom of the heat conducting block and are connected with the contact voltage regulator through wires.
The input voltage of the contact voltage regulator is 220V, for example, and the output voltage is 0V-250V, for example.
The bottom surface of the test piece is contacted with the temperature measuring surface at the top of the convex part of the heat conducting block, and the top surface is contacted with the bottom surface of the infrared quartz glass.
The bottom surface of the infrared quartz glass is contacted with the top surface of the test piece, the top surface is contacted with the graphite gasket, the quartz glass can have stronger absorption effect on infrared radiation on the path of the quartz glass in a specific wave band, and the accuracy of temperature measurement is improved.
The bottom surface of the graphite gasket is contacted with the top surface of the infrared quartz glass, the top surface is contacted with the concave surface of the upper flange, and the graphite gasket and the infrared quartz glass are embedded in the groove of the upper flange together.
The temperature data acquisition device is connected with the thermocouple through a wire and is connected with the display screen through a data transmission line.
Second preferred embodiment
The following describes a preferred embodiment of the calibration method of the radiation temperature measurement calibration device for the cooling effect experiment of the gas turbine according to the embodiment of the invention.
S1, placing a test piece: the test piece to be tested is contacted with the graphite gasket and placed in the groove of the upper flange, the glass fiber insulation sleeve and the lower flange are fastened by utilizing the cooperation of the long bolt and the long nut, and then the thermocouple temperature measuring device is fixed on the vertical surface of the L-shaped locating plate, and the distance between the thermocouple temperature measuring device and the horizontal surface of the L-shaped locating plate can be adjusted by selecting the position of the cooperation hole of the vertical surface of the L-shaped locating plate.
S2, placing by using a thermal infrared imager: the thermal infrared imager is placed on the thermal infrared imager bracket, and the distance and the angle between the thermal infrared imager and the test piece can be adjusted by selecting the position of the positioning hole of the horizontal plane of the L-shaped positioning plate.
S3, fine adjustment of height and focal length: observing an infrared image displayed by a computer, and adjusting the height of a bracket of the thermal infrared imager to ensure that the center of a lens of the thermal infrared imager and the horizontal plane of the L-shaped locating plate opposite to the center of the test piece are at the same height, so that the test piece is displayed in the center of the infrared image; and adjusting the focal length of the camera to enable the display image to be in a clear state.
S4, heating test: the contact voltage regulator is connected with a power supply, the heating rod is connected with the contact voltage regulator, the output voltage of the contact voltage regulator is slowly regulated to control the temperature of a test piece, the temperature measured by 12 thermocouples on a display screen is observed, when the thermocouple temperature reaches the vicinity of the marking temperature and the temperature change amount of 12 measuring points is not more than 1K within 10 minutes, the test piece can be considered to reach heat balance, at the moment, infrared images and the thermocouple temperature are intercepted continuously sixteen times at the same time, and when the thermocouple temperature reaches the highest marking temperature, the power supply connected with the contact voltage regulator is disconnected in time.
S5, data analysis: sixteen groups of infrared images and sixteen groups of measuring point thermocouple temperatures near different marking temperatures are respectively obtained through the step S4, the infrared images are analyzed through AnalyzIR software to obtain surface distribution data of the temperature of a test piece, after each group of temperature data is respectively subjected to average processing, MATLAB is used for fitting processing, and then a correlation formula between the infrared temperature and the thermocouple temperature in a specific experimental working condition range is obtained.
Third preferred embodiment
Another preferred embodiment of the radiation temperature measurement calibration device and method for the cold efficiency experiment of the gas turbine is described below.
As shown in figures 1-2, the radiation temperature measurement calibration device for the cold efficiency experiment of the gas turbine comprises an L-shaped positioning plate 1, an infrared temperature measurement device 2 which is carried on the horizontal plane of the L-shaped positioning plate 1, and a thermocouple temperature measurement device 3 which is carried on the vertical plane.
As shown in fig. 1, an L-shaped positioning plate 1 is connected with an infrared temperature measuring device 2 and a thermocouple temperature measuring device 3 through positioning holes on a horizontal plane and a vertical plane of the positioning plate respectively.
As shown in fig. 1, the infrared temperature measuring device 2 includes a thermal infrared imager 2-1, a thermal infrared imager support 2-2, and a computer 2-3 (as an example of the processing module 2-3). The thermal infrared imager 2-1 is carried on the thermal infrared imager bracket 2-2 and is connected with the computer 2-3 through a data transmission line. The infrared thermal imager bracket 2-2 is fixed on the horizontal plane of the L-shaped locating plate 1 through a locating hole on the horizontal plane of the L-shaped locating plate 1.
As shown in figures 1 and 3, the thermocouple temperature measuring device 3 comprises a long bolt 3-1, a long nut 3-2, a lower flange 3-3, a glass fiber insulation sleeve 3-4, a heat conducting block 3-5, a thermocouple 3-6, a heating rod 3-7, infrared quartz glass 3-9, a graphite gasket 3-10, an upper flange 3-11, a temperature data acquisition device 3-12, a contact voltage regulator 3-13 and a display screen 3-14. The long bolt 3-1 is matched with the long nut 3-2 to tightly press the lower flange 3-3, the glass fiber insulation sleeve 3-4 and the upper flange 3-11, a test piece 3-8, an infrared quartz glass 3-9 and a graphite gasket 3-10 are arranged between the heat conducting block 3-5 and the upper flange 3-11 from bottom to top, and the temperature acquisition device 3-12 is connected with 12 thermocouples 3-6 through wires and is connected with the display screen 3-14 through a data transmission line.
As shown in FIG. 4, the long bolts 3-1 and the long nuts 3-2 are distributed at six groups of the first matching holes 3-11-1, the second matching holes 3-11-2, the third matching holes 3-11-3, the fourth matching holes 3-11-4, the fifth matching holes 3-11-5 and the sixth matching holes 3-11-6.
As shown in FIG. 5, the heat conducting block 3-5 is made of copper material with good heat conducting performance, the shape of the outer surface of the bottom of the heat conducting block 3-5 is the same as that of the inner surface of the glass fiber heat insulation sleeve 3-4, 6 round holes are uniformly arranged in the bottom of the heat conducting block 3-5 and used for installing 6 heating rods 3-7 with the weight of 200W, the shape and the size of the contact surface of the heat conducting block 3-5 and the test piece 3-8 are the same, and six holes are uniformly arranged on two sides of the protruding part of the heat conducting block 3-5 and used for arranging thermocouples 3-6.
As shown in FIG. 7, the calibration method of the radiation temperature measurement calibration device for the cooling effect experiment of the gas turbine comprises steps S1 to S5.
S1, placing a test piece: the test piece 3-8 to be tested is contacted with the graphite gasket 3-10 and is placed in the groove of the upper flange 3-11, the glass fiber insulation sleeve 3-4 and the lower flange 3-3 are fastened by utilizing the cooperation of the long bolt 3-1 and the long nut 3-2, the thermocouple temperature measuring device 3 is fixed on the vertical surface of the L-shaped locating plate 1, and the distance between the thermocouple temperature measuring device 3 and the horizontal surface of the L-shaped locating plate 1 can be adjusted by selecting the position of the cooperation hole of the vertical surface of the L-shaped locating plate 1.
S2, placing by using a thermal infrared imager: the thermal infrared imager 2-1 is arranged on the thermal infrared imager bracket 2-2, and the distance and the angle between the thermal infrared imager 2-1 and the test piece 3-8 can be adjusted by selecting the position of the matching hole of the horizontal plane of the L-shaped locating plate 1.
S3, fine adjustment of height and focal length: and observing an infrared image displayed by a computer, adjusting the height of the infrared thermal imager bracket 2-2 to enable the lens center of the infrared thermal imager 2-1 and the horizontal plane of the L-shaped locating plate 1 corresponding to the center of the test piece 3-8 to be at the same height, enabling the test piece 3-8 to be displayed at the center of the infrared image, and adjusting the focal length of the camera to enable the displayed image to be in a clear state.
S4, heating test: connecting the contact voltage regulator 3-13 with a power supply, connecting a lead of a heating rod with the contact voltage regulator 3-13, slowly adjusting the output voltage of the power supply to control the temperature of the test piece 3-8, and observing the temperature measured by 12 thermocouples 3-6 on the display screen 3-14; when the thermocouple temperature reached around the mark temperature and the temperature change amount of 12 measurement points did not exceed 1K in 10 minutes, it can be considered that the test pieces 3-8 reached thermal equilibrium, at which time sixteen consecutive times infrared images and thermocouple temperatures were simultaneously taken. When the thermocouple temperature reaches the highest marking temperature, the power supply connected with the contact voltage regulator 3-13 is disconnected in time.
S5, data analysis: s4, sixteen groups of infrared images and sixteen groups of real temperatures of measuring points near different marking temperatures are respectively obtained, and analysis is carried out on the infrared images by utilizing AnalyzIR software to obtain surface distribution data of the temperature of the test piece; after the average treatment is carried out, fitting treatment is carried out by utilizing MATLAB, and then a correlation formula between the infrared temperature and the real temperature in the specific working condition range of the experiment is obtained.
The calibration method of the present invention will be further described below by way of specific tests taking the above calibration method as an example.
The test object is a high-temperature alloy GH3625 for turbine blades in the field of gas turbines, and the test results are shown in table 1, wherein table 1 shows thermocouple temperatures and infrared temperatures of GH3625 at an experimental temperature range of 20-300 ℃.
TABLE 1
Under the test of the calibration device and the calibration method of the invention, the infrared calibration formula of GH3625 can be obtained as T through the table 1 Infrared ray ＝1.86191*T Thermocouple 1.29652, namely obtaining the corresponding relation between the infrared temperature and the real temperature under the specific experimental working condition.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment, or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into a plurality of sub-modules.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Furthermore, some of the embodiments are described herein as methods or combinations of method elements that may be implemented by a processor of a computer system or by other means of performing the functions. Thus, a processor with the necessary instructions for implementing the described method or method element forms a means for implementing the method or method element. Furthermore, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is for carrying out the functions performed by the elements for carrying out the objects of the invention.
As used herein, unless otherwise specified the use of the ordinal terms "first," "second," "third," etc., to describe a general object merely denote different instances of like objects, and are not intended to imply that the objects so described must have a given order, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is defined by the appended claims.
Claims (9)
1. The radiation temperature measurement calibration device for the gas turbine cold effect experiment is characterized by comprising an L-shaped positioning plate (1), an infrared temperature measurement unit (2) and a thermocouple temperature measurement unit (3);
the infrared temperature measurement unit (2) comprises an infrared thermal imager (2-1), an infrared thermal imager bracket (2-2) and a processing module (2-3); the thermal infrared imager (2-1) is carried on the thermal infrared imager bracket (2-2) and is connected with the processing module (2-3) through a data transmission line;
the thermocouple temperature measurement unit (3) comprises a heating subunit and a collecting subunit, wherein the heating subunit comprises a long bolt (3-1), a long nut (3-2), a lower flange (3-3), a glass fiber insulation sleeve (3-4), a heat conducting block (3-5), a thermocouple (3-6), a heating rod (3-7), infrared quartz glass (3-9), a graphite gasket (3-10) and an upper flange (3-11), and the collecting subunit comprises a temperature data collecting device (3-12), a contact voltage regulator (3-13) and a display screen (3-14);
the long bolt (3-1) is matched with the long nut (3-2) to tightly press the lower flange (3-3), the glass fiber insulation sleeve (3-4) and the upper flange (3-11), the heat conducting block (3-5) is arranged inside the glass fiber insulation sleeve (3-4), a test piece (3-8), the infrared quartz glass (3-9) and the graphite gasket (3-10) are arranged between the heat conducting block (3-5) and the upper flange (3-11) from bottom to top, and the temperature data acquisition device (3-12) is connected with the thermocouple (3-6) through a wire and is connected with the display screen (3-14) through a data transmission line;
The L-shaped positioning plate (1) comprises a vertical surface and a horizontal surface, wherein the vertical surface is used for carrying a heating subunit of the thermocouple temperature measuring unit (3), and the horizontal surface is used for carrying the infrared temperature measuring unit (2);
the heating rods (3-7) are respectively inserted into round holes at the bottoms of the heat conducting blocks (3-5) and connected with the contact voltage regulator (3-13) through wires, and the contact voltage regulator (3-13) is connected with a power supply, wherein M is a positive integer.
2. The radiation temperature measurement calibration device for the cooling effect experiment of the gas turbine according to claim 1, wherein,
the distance between the thermocouple temperature measuring unit (3) and the horizontal plane of the L-shaped locating plate (1) is adjusted by selecting the position of a locating hole of the vertical surface of the L-shaped locating plate (1), and the distance and the angle between the thermal infrared imager (2-1) and the test piece (3-8) are adjusted by selecting the position of the locating hole of the horizontal plane of the L-shaped locating plate (1), so that the distance and the angle between the thermal infrared imager (2-1) and the test piece (3-8) are matched with the actual distance and the angle of the specific experimental working condition.
3. The radiation temperature measurement calibration device for the cold efficiency experiment of the gas turbine according to claim 1, wherein a thermocouple (3-6) and a heating rod (3-7) in the device are detachable components, and the test piece (3-8) is detachably arranged in the device.
4. The gas turbine cold efficiency experiment radiation temperature measurement calibration apparatus according to claim 1, wherein a bottom surface of the infrared quartz glass (3-9) is in contact with a top surface of the test piece (3-8), and a top surface of the infrared quartz glass (3-9) is in contact with the graphite gasket (3-10); the infrared quartz glass (3-9) is used for absorbing infrared radiation in a predetermined band range and filtering out radiation outside the predetermined band range.
5. The radiation temperature measurement calibration device for the cold efficiency experiment of the gas turbine according to claim 1, wherein the L-shaped positioning plate (1) is connected with the infrared temperature measurement unit (2) and the thermocouple temperature measurement unit (3) through positioning holes on a horizontal plane and a vertical plane of the L-shaped positioning plate respectively; the thermal infrared imager bracket (2-2) is fixed on the horizontal plane of the L-shaped positioning plate (1) through a positioning hole on the horizontal plane of the L-shaped positioning plate (1).
6. The gas turbine cold efficiency experiment radiation temperature measurement calibration apparatus according to any one of claims 1 to 5, wherein the long bolts (3-1) and the long nuts (3-2) are N groups, and the N groups of long bolts (3-1) and long nuts (3-2) are distributed at N matching holes of each of the lower flange (3-3), the glass fiber insulation sleeve (3-4) and the upper flange (3-11), wherein N is a positive integer.
7. The radiation temperature measurement calibration device for the cold efficiency experiment of the gas turbine according to claim 6, wherein N=6, 6 groups of long bolts (3-1) and long nuts (3-2) are distributed at the first matching hole (3-11-1), the second matching hole (3-11-2), the third matching hole (3-11-3), the fourth matching hole (3-11-4), the fifth matching hole (3-11-5) and the sixth matching hole (3-11-6);
wherein the lower flange (3-3), the glass fiber insulation sleeve (3-4) and the upper flange (3-11) are respectively provided with a corresponding first side, a second side, a third side and a fourth side, wherein the first side is opposite to the third side, and the second side is opposite to the fourth side;
the first mating hole (3-11-1) and the second mating hole (3-11-2) are located on the first side, the third mating hole (3-11-3) is located on the second side, the fourth mating hole (3-11-4) and the fifth mating hole (3-11-5) are located on the third side, and the sixth mating hole (3-11-6) is located on the fourth side.
8. The gas turbine cold efficiency experiment radiation temperature measurement calibration apparatus according to any one of claims 1 to 5, wherein the shape of the outer surface of the bottom of the heat conducting block (3 to 5) is the same as the shape of the inner surface of the glass fiber insulation sleeve (3 to 4), a plurality of round holes are uniformly arranged in the bottom of the heat conducting block (3 to 5) for installing the heating rod (3 to 7), the shape and the size of the contact surface of the heat conducting block (3 to 5) and the test piece (3 to 8) are the same, and a plurality of holes are uniformly arranged on both sides of the protruding portion of the heat conducting block (3 to 5) for arranging the thermocouple (3 to 6).
9. The calibration method of the radiation temperature measurement calibration device for the cold efficiency experiment of the gas turbine according to any one of claims 1 to 8, comprising the following steps:
s1, the top surface of a test piece (3-8) to be tested is contacted with the bottom surface of infrared quartz glass (3-9), the top surface of the infrared quartz glass (3-9) is contacted with a graphite gasket (3-10), the test piece and the graphite gasket are placed in a groove of an upper flange (3-11), the upper flange (3-11), a glass fiber insulation sleeve (3-4) and a lower flange (3-3) are fastened by utilizing the cooperation of a long bolt (3-1) and a long nut (3-2), and then a thermocouple temperature measuring unit (3) is fixed on the vertical surface of an L-shaped locating plate (1);
s2, placing the thermal infrared imager (2-1) on a thermal infrared imager bracket (2-2);
s3, adjusting the height of the thermal infrared imager bracket (2-2) to enable the lens center of the thermal infrared imager (2-1) and the horizontal plane of the L-shaped locating plate (1) opposite to the center of the test piece (3-8) to be at the same height, enabling the test piece (3-8) to be displayed at the center of an infrared image, and adjusting the focal length of a camera to enable the display image to be in a clear state;
s4, connecting a contact voltage regulator (3-13) with a power supply, connecting a heating rod (3-7) with the contact voltage regulator (3-13), regulating the output voltage of the contact voltage regulator (3-13) to control the temperature of a test piece (3-8), observing the temperature measured by 12 thermocouples (3-6) on a display screen (3-14), judging that the test piece (3-8) reaches thermal balance when the thermocouple temperature reaches the vicinity of a mark temperature and the temperature change amount of 12 measuring points is not more than 1K within 10 minutes, simultaneously intercepting infrared images and thermocouple temperatures for sixteen times continuously, and timely disconnecting the power supply connected with the contact voltage regulator (3-13) when the thermocouple temperature reaches the highest mark temperature;
And S5, respectively obtaining sixteen groups of infrared images and sixteen groups of measuring point thermocouple temperatures near different marking temperatures through the step S4, analyzing the infrared images to obtain surface distribution data of the temperature of the test piece, respectively carrying out average treatment on each group of temperature data, and then carrying out fitting treatment to obtain a corresponding relation between the infrared temperature and the real temperature under the specific experimental working condition.
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| CN109813440A (en) * | 2019-03-12 | 2019-05-28 | 烟台艾睿光电科技有限公司 | A kind of thermal infrared imager caliberating device, thermometric scaling method |
| CN114199386A (en) * | 2021-12-14 | 2022-03-18 | 南京航空航天大学 | Method for measuring temperature of anti-icing surface of rotating cap cover in icing wind tunnel |
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