CN108362734B - Method and device for testing heat transfer performance of textile under hot air flow impact - Google Patents
Method and device for testing heat transfer performance of textile under hot air flow impact Download PDFInfo
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- CN108362734B CN108362734B CN201810377123.5A CN201810377123A CN108362734B CN 108362734 B CN108362734 B CN 108362734B CN 201810377123 A CN201810377123 A CN 201810377123A CN 108362734 B CN108362734 B CN 108362734B
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- 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
Abstract
The invention discloses a method and a device for testing the heat transfer performance of a textile under hot air flow impact. The high-speed fan and the heating wire are used for providing heat flow, and the heat flux meter is used for measuring the heat exchange heat flux value of hot air flow on the surface of the fabric to be measured. The thermal infrared imager can test the temperature cloud image on the back of the fabric under the condition of not contacting the fabric to be tested, and the transfer process of heat in the thickness direction of the fabric sample is obtained. The whole testing device is simple in structure, few in adjustable parameters and simple and quick to operate. The whole test process does not damage the fabric to be tested, the test can be repeated, the cost is saved, the operation is safe, and the practicability is high.
Description
Technical Field
The invention belongs to the technical field of testing of heat transfer performance of textile materials, and relates to a method and a device for testing the heat transfer performance of a textile under hot air flow impact.
Background
In recent years, thermal protection textile materials have been widely used for high-temperature heat insulation and preservation of fire-fighting clothing, petrochemical equipment, containers and pipelines; heat shields for automotive engines, wraps for heavy oil engine exhaust pipes, and the like. With the continuous development of computer science and information technology, people have begun to research the heat transfer performance of textiles by using a numerical simulation method. The heat transfer performance of the textile material is simulated by using a numerical simulation method, so that the method is simple and rapid, the cost is reduced, the resources are saved, the smoke toxicity is reduced, and an important theoretical basis can be provided for the design, the evaluation and the optimization of the heat insulation performance and the like of various thermal protection textile products.
The previous research on the heat transfer performance of the material under the impact of hot air flow mainly focuses on the thermal protection material for the high-speed aircraft. The hot air flow impact borne by the surface of the high-speed aircraft in a real service environment increases along with the increase of the speed of the high-speed aircraft, and the material is required to have good heat insulation performance so as to adapt to a harsh thermal environment. In order to ensure the safety of the aircraft, experiments are usually required to detect the heat transfer performance of the thermal protection material, wherein a common method is to utilize wind tunnel experiments and arc jet tests to evaluate the thermal protection performance of the material. The wind tunnel experiment utilizes the similarity principle, simulates a real flight environment, tests the surface heat flow density value of the material, and provides available data for researching the heat transfer performance of the surface material of the aircraft. However, the experiment has the disadvantages of complex operation, high cost, long time consumption, low precision, non-repeatability and the like. The arc spraying test heats the airflow to a high-temperature state by using continuous arcs passing between two groups of electrodes, but the test only considers the action of the high-temperature airflow, the area of a test sample is small, and the heat flux value is not easy to control. Therefore, it is necessary to develop a testing device and equipment which is simple in operation, low in cost and capable of accurately testing the heat transfer performance of the material under the impact of high-temperature or low-temperature hot air flow.
Aiming at the defects in the existing research, the invention aims to provide a testing device which can accurately measure the heat flux on the surface of a textile and can accurately obtain the temperature rise condition of the back of the textile in the hot air flow impact process.
The device can accurately obtain the heat flux value of the textile surface under the impact of hot air flow, and the application of the device in the numerical simulation process of the thermal protection material is very helpful for improving the precision of the numerical simulation of the thermal transmission performance of the thermal protection textile; in addition, experimental verification is the best method for testing the accuracy of the textile heat transfer numerical simulation result, the device designed by the invention can be used for accurately obtaining the temperature cloud chart of the textile back under the impact of hot air flow, and a favorable testing tool can be provided for the accuracy verification of the textile heat transfer performance numerical simulation result. The method can provide a favorable measuring tool for basic theory research and engineering application of textile heat transfer, and can also provide a reliable basis for the later research of development and application of the thermal protection fabric under high-temperature hot airflow.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method and a device for testing the heat transfer performance of a textile under the impact of hot air flow. The high-speed fan and the heating wire are used for providing heat flow, and the heat flow meter is used for measuring the heat flux value of the heat exchange of the hot air flow on the surface of the sample to be measured. The thermal infrared imager can test the temperature cloud image on the back of the fabric under the condition of not contacting with a sample to be tested, and the transfer process of heat in the thickness direction of the fabric sample is obtained. The whole testing device is simple in structure, few in adjustable parameters and simple and quick to operate. The whole test process does not damage the sample to be tested, the test can be repeated, the cost is saved, the operation is safe, and the practicability is high.
The technical scheme for solving the technical problems is as follows: the device for testing the heat transfer performance of the textile under the impact of hot air flow is characterized by comprising a sample table, a heat flow generating device, a slide way, a flat plate, a support, a clamp for fixing a sample on the support, a lifting table and a thermal infrared imager.
The slide is installed on the sample platform, and the slide includes inner tube, outer tube, and the inner tube is fixed on the sample platform, and the outer tube can slide along the inner tube. The distance between the sample to be measured and the air outlet is adjusted by sliding the outer tube. Spacing holes are formed in the inner tube and the outer tube at intervals, and after the sample to be measured is adjusted to reach the specified distance from the air outlet, the position of the outer tube is fixed by inserting screws into the spacing holes.
The thermal flow generating device is installed on one side of the slide way, the thermal infrared imager is installed on the other side of the slide way through the lifting platform, and the lens of the thermal infrared imager is opposite to the sample to be detected. The flat plate is fixed on the outer tube, the support is L-shaped, the transverse section of the support is horizontally fixed on the flat plate, and the sample to be detected is fixed on the vertical section of the support opposite to one side of the heat flow generating device through the clamp.
And a shell of the heat flow generating device is provided with a power switch, a cold/hot air switch and an air outlet, and the air outlet is over against the sample to be detected. The high-speed motor, the fan and the heating wire are sequentially arranged in the air conditioner from left to right, and the heating wire is close to the air outlet.
The commercial power is connected into the testing device through the power switch, the high-speed motor and the heating wire are respectively conducted with the commercial power, and the high-speed motor is axially connected with the fan. The cold/hot air switch is arranged on a conductive wire of the electric heating wire to control the conduction and the interruption of the electric heating wire and the commercial power.
And a heat flow meter is additionally arranged, and a probe of the heat flow meter is fixed on the outer surface of the sample to be tested, which is right opposite to the air outlet, through a heat conduction paste so as to test the change of the surface heat flux of the sample to be tested.
And a digital anemometer is arranged to test the wind speed of the wind outlet.
Furthermore, the invention designs a method for testing the heat transfer performance of a textile under the impact of hot air flow, which is characterized by adopting the testing device and the following steps:
the method comprises the following steps: and flatly fixing the sample to be measured on the vertical section of the bracket by using a plurality of clamps under the condition of not applying tension, so that the middle of the sample to be measured faces the air outlet.
Step two: the distance between the sample and the air outlet is adjusted, and the tail end of the slide way is fixed by screws, so that the slide way is prevented from moving and causing measurement errors.
Step three: and opening a switch on the heat flow generating device, pressing a power key of the digital anemometer to turn on and zero the anemometer, testing the wind speed of the air outlet, and measuring for many times to obtain an average value of the wind speed.
Step four: and (3) fixing a probe of the heat flow meter on the surface of the sample to be tested by using the heat conduction paste, facing the air outlet, opening a switch of the heat flow meter, and testing the change of the heat flux on the surface of the sample to be tested.
Step five: and after testing the wind speed of the wind outlet and the heat flux value of the surface of the sample to be tested, closing switches of the anemometer, the heat flow meter and the heat flow generating device. And adjusting the distance between the lifting platform and the sample to be measured, wherein the range of 15cm-20cm is selected, and the height of the lifting platform is adjusted so that the lens of the thermal infrared imager faces the sample.
Step six: opening the thermal infrared imager, entering a setting page, and setting the range of the test temperature and the test time; and entering a test page after the setting is finished. Adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, opening a switch of the heat flow generating device, opening a hot air switch, starting a testing page of the thermal imager, starting testing, recording the change condition of the back temperature cloud image of the sample to be tested in a testing area by using the thermal infrared imager, and obtaining a curve of the back temperature of the sample to be tested along with the change of time.
Compared with the prior art, the heat flux value of the textile surface under the heat flow impact is obtained through testing, and the heat flux value is applied to the numerical simulation research of the thermal protection, so that the accuracy of the numerical simulation of the heat transfer performance of the thermal protection textile is greatly improved; in addition, experimental verification is the best method for testing the accuracy of the textile heat transfer numerical simulation result, the device designed by the invention can be used for accurately obtaining the temperature cloud chart of the textile back under the impact of heat flow, and a favorable testing tool can be provided for the accuracy verification of the textile heat transfer performance numerical simulation result. This can provide an advantageous measurement tool for textile heat transfer basic theory research and engineering applications.
Drawings
Fig. 1 is a schematic structural diagram of a testing apparatus according to an embodiment of the invention.
Fig. 2 is a front view of a heat flow generating device according to an embodiment of the present invention.
Fig. 3 is a schematic view illustrating the assembly of the main components inside the heat flow generating device according to an embodiment of the present invention.
FIG. 4 is a graph of test data obtained in the first and second embodiments.
FIG. 5 is a graph of test data obtained in the third and fourth examples.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
The invention provides a device for testing the heat transfer performance of a textile under hot air flow impact (a testing device for short, see fig. 1-5), which is characterized by comprising a sample table 1, a heat flow generating device 2, a flat plate 3, a slideway 4, a support 5, a clamp 6 for fixing a sample on the support, a lifting table 8 and a thermal infrared imager 9.
The heat flow generating device 2 is arranged on one side of the slide 4, the thermal infrared imager 9 is arranged on the other side of the slide 4 through the lifting platform 8, and the lens of the thermal infrared imager is opposite to the sample 7 to be measured. The flat plate 3 is fixed on the outer tube 42, the support 5 is in an L shape, the transverse section of the support is horizontally fixed on the flat plate 3, and the sample 7 to be measured is fixed on the vertical section of the support 5 at the side opposite to the heat flow generating device 2 through the clamp 6.
The shell of the heat flow generating device 2 is provided with a power switch 21, a cold/hot air switch 22 and an air outlet 23, and the air outlet 23 is opposite to the sample 7 to be detected. A high-speed motor 24, a fan 25 and a heating wire 26 are sequentially arranged in the air conditioner from left to right, and the heating wire 26 is close to the air outlet 23.
The commercial power is connected to the testing device through the power switch 21, the high-speed motor 24 and the heating wire 26 are respectively conducted with the commercial power, and the high-speed motor 24 is axially connected with the fan 25. The cold/hot air switch 22 is installed on a conductive line of the heating wire 26 to control the conduction and interruption of the heating wire 26 and the commercial power.
And a heat flow meter is additionally arranged, and a probe of the heat flow meter is fixed on the outer surface of the sample 7 to be tested, which is right opposite to the air outlet 23, through a heat conduction paste so as to test the change of the heat flux on the surface of the sample 7 to be tested.
A digital anemometer (Testo 425, germany) is further provided to test the wind speed of the outlet 23.
The digital anemometer is an independent device, aims to measure the wind speed of the air outlet and can be removed after the test is finished.
The heat flux meter is an independent device, and aims to measure the heat flux value of the surface of a sample to be tested at a certain distance from the air outlet in a certain environment, and the heat flux meter can be removed after the test is finished.
The heat flow meter is used for measuring the heat quantity flowing through a unit area in unit time, and the unit of heat flow is W/m2All heat flow meters of the invention are contact heat flow meters (GreenTEG, Switzerland), are arranged near one side of the slideway, a probe of the heat flow meter is fixed on a test material by a heat conduction paste, so that the probe faces an air outlet, and the change condition of the heat flux on the surface of the textile is tested for a certain time.
The infrared thermal imager is a device for detecting infrared heat by non-contact (FLUKE US) which allows the remote detection of infrared radiant energy and its conversion into electrical signals, generating on a display a thermal image corresponding to the thermal distribution field of the surface of the object, the different colours on the thermal image representing the different temperatures of the object to be measured. The thermal infrared imager is arranged above the lifting platform beside the sample platform, and the lifting platform is used for adjusting the height of the thermal imager to be exactly consistent with the height of the test sample.
The thermal infrared imager can monitor the temperature change of a test area at different time intervals within a specified time in real time, can obtain a change curve of the temperature along with the time, and can also obtain a two-dimensional temperature distribution cloud picture. In the traditional test method, a thermocouple is usually adopted to test the instantaneous temperature value of the surface of the fabric at a certain moment, the thermocouple must be in contact with an object to be tested during the test, and the introduction of the thermocouple can influence the heat transfer process of the fabric and bring errors to the experimental result.
Furthermore, the invention provides a method for testing the heat transfer performance of a textile under the impact of hot air flow, which is characterized by adopting the testing device and the following steps:
the method comprises the following steps: and flatly fixing the sample to be measured on the vertical section of the bracket by using a plurality of clamps under the condition of not applying tension, so that the middle of the sample to be measured faces the air outlet.
Step two: the distance between the sample and the air outlet is adjusted, and the tail end of the slide way is fixed by screws, so that the slide way is prevented from moving and causing measurement errors.
Step three: and opening a switch on the heat flow generating device, pressing a power key of the digital anemometer to turn on and zero the anemometer, testing the wind speed of the air outlet, and measuring for many times to obtain an average value of the wind speed.
Step four: and (3) fixing a probe of the heat flow meter on the surface of the sample to be tested by using the heat conduction paste, facing the air outlet, opening a switch of the heat flow meter, and testing the change of the heat flux on the surface of the sample to be tested.
Step five: and after testing the wind speed of the wind outlet and the heat flux value of the surface of the sample to be tested, closing switches of the anemometer, the heat flow meter and the heat flow generating device. And adjusting the distance between the lifting platform and the sample to be measured, wherein the range of 15cm-20cm is selected, and the height of the lifting platform is adjusted so that the lens of the thermal infrared imager faces the sample.
Step six: opening the thermal infrared imager, entering a setting page, and setting the range of the test temperature and the test time; and entering a test page after the setting is finished. Adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, opening a switch of the heat flow generating device, opening a hot air switch, starting a testing page of the thermal infrared imager, starting testing, recording the change condition of a back temperature cloud chart of the sample to be tested in a testing area by using the thermal infrared imager, and obtaining a curve of the back temperature of the sample to be tested changing along with time.
Example one
The present embodiment provides a method and an apparatus for testing the heat transfer performance of a textile under hot air flow impact, where the apparatus is as described above, and the method includes:
the method comprises the following steps: and flatly fixing the 300mm multiplied by 200mm to-be-detected carbon fiber plain woven fabric on the vertical section of the support by using a plurality of clamps under the condition of not applying tension, so that the middle of the carbon fiber plain woven fabric faces the air outlet.
Step two: the distance between the sample and the air outlet is adjusted to enable the carbon fiber plain woven fabric to be 10mm away from the air outlet, and the tail end of the slide way is fixed by screws to prevent the slide way from moving.
Step three: and opening a switch of the heat flow generating device, opening a fan switch, pressing a power key of the digital anemometer to turn on and zero the anemometer, testing the wind speed of the air outlet, measuring for many times to obtain an average value, and folding and placing the digital anemometer after the test is finished.
Step four: fixing a probe of the heat flow meter on the outer surface of the carbon fiber fabric by using a heat conduction paste, facing an air outlet, testing and recording the heat flux value of the surface of the carbon fiber plain fabric within 80s, and removing the heat flow meter after the test is finished.
Step five: after the wind speed of the air outlet and the heat flux value of the surface of the sample to be measured are tested, the distance between the lifting platform and the sample to be measured is adjusted, and the height of the lifting platform is adjusted, so that the lens of the thermal infrared imager is directly opposite to the sample.
Step six: and opening the thermal infrared imager, setting the range of the test temperature and the test time, and entering a test page after the setting is finished. Adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, starting a testing page of the thermal infrared imager, opening a switch of the heat flow equipment, opening a hot air switch, starting testing, recording the change condition of a temperature cloud image on the back of the sample to be tested by using the thermal infrared imager, and obtaining a curve of the change of the back temperature of the sample to be tested along with time. The thermal infrared imager can monitor the temperature change curve of the test area at different time within the set time in real time.
Example two
The present embodiment provides a method and an apparatus for testing the heat transfer performance of a textile under hot air flow impact, where the apparatus is as described above, and the method includes:
the method comprises the following steps: the 2/1 carbon fiber twill fabric to be tested with the size of 300mm multiplied by 200mm is flatly fixed on the vertical section of the bracket by a plurality of clamps under the condition of not applying tension, so that the middle of the glass fiber plain fabric faces the air outlet.
Step two: the distance between the sample and the air outlet is adjusted, the carbon fiber twill fabric is 10mm away from the air outlet, and the tail end of the slide way is fixed by screws to prevent the slide way from moving.
Step three: and (3) opening the heat flow generating device, opening a cold air switch, pressing a power key of the digital anemometer to open and zero the anemometer, testing the wind speed of the air outlet, measuring for many times to obtain an average value, and folding and placing the digital anemometer after the test is finished.
Step four: the heat conduction paste is utilized to enable a probe of the heat flow meter to face the air outlet and be fixed on the outer surface of the carbon fiber twill fabric, a switch of the heat flow generating device is opened, a hot air switch is opened, the size of the heat flux on the surface of the carbon fiber twill fabric in 80s is tested, and the heat flow meter is removed after the test.
Step five: and after testing the wind speed of the wind outlet and the heat flux value of the surface of the sample to be tested, closing switches of the anemometer and the heat flow meter. And adjusting the distance between the lifting platform and the sample to be measured, and adjusting the height of the lifting platform so as to enable the lens of the thermal infrared imager to face the sample.
Step six: and opening the thermal infrared imager, setting the range of the test temperature and the test time, and entering a test page after the setting is finished. Adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, starting a testing page of the thermal infrared imager, opening a switch of the heat flow equipment, opening a hot air switch, starting testing, recording the change condition of a temperature cloud image on the back of the sample to be tested by using the thermal infrared imager, and obtaining a curve of the change of the back temperature of the sample to be tested along with time.
EXAMPLE III
The present embodiment provides a method and an apparatus for testing the heat transfer performance of a textile under hot air flow impact, where the apparatus is as described above, and the method includes:
the method comprises the following steps: the 2/1 glass fiber twill fabric to be tested with the size of 300mm multiplied by 200mm is flatly fixed on the vertical section of the support by a plurality of clamps under the condition of not applying tension, so that the middle of the 2/1 glass fiber twill fabric faces the air outlet.
Step two: the distance between the sample and the air outlet is adjusted to enable 2/1 glass fiber fabrics to be 10mm away from the air outlet, and the tail end of the slide way is fixed by screws to prevent the slide way from moving.
Step three: and opening a switch of the heat flow generating device, opening a fan switch, pressing a power key of the digital anemometer to turn on and zero the anemometer, testing the wind speed of the air outlet, measuring for many times to obtain an average value, and folding and placing the digital anemometer after the test is finished.
Step four: and (3) utilizing the heat conduction paste to enable a probe of the heat flow meter to face the air outlet and be fixed on the outer surface of the glass fiber twill fabric, opening a switch of the heat flow generating device, opening a hot air switch, testing the change of the heat flux on the surface of the glass fiber twill fabric in 80s, and removing the heat flow meter after the test is finished.
Step five: and after testing the wind speed of the wind outlet and the heat flux value of the surface of the sample to be tested, closing switches of the anemometer and the heat flow meter. And adjusting the distance between the lifting platform and the sample to be measured, and adjusting the height of the lifting platform so as to enable the lens of the thermal infrared imager to face the sample.
Step six: and opening the thermal infrared imager, setting the range of the test temperature and the test time, and entering a test page after the setting is finished. Adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, starting a testing page of the thermal infrared imager, opening a switch of the heat flow equipment, opening a hot air switch, starting testing, recording the change condition of a temperature cloud image on the back of the sample to be tested by using the thermal infrared imager, and obtaining a curve of the change of the back temperature of the sample to be tested along with time.
Example four
The present embodiment provides a method and an apparatus for testing the heat transfer performance of a textile under hot air flow impact, where the apparatus is as described above, and the method includes:
the method comprises the following steps: the 2/1 glass fiber twill fabric to be tested with the size of 300mm multiplied by 200mm is flatly fixed on the vertical section of the support by a plurality of clamps under the condition of not applying tension, so that the middle of the 2/1 glass fiber twill fabric faces the air outlet.
Step two: the distance between the sample and the air outlet is adjusted to enable the 2/1 glass fiber twill fabric to be 30mm away from the air outlet, and the tail end of the slide way is fixed by screws to prevent the slide way from moving.
Step three: and opening a switch of the heat flow generating device, opening a fan switch, pressing a power key of the digital anemometer to turn on and zero the anemometer, testing the wind speed of the air outlet, measuring for many times to obtain an average value, and folding and placing the digital anemometer after the test is finished.
Step four: and (3) utilizing the heat conduction paste to enable a probe of the heat flow meter to face the air outlet and be fixed on the outer surface of the glass fiber twill fabric, opening a switch of the heat flow generating device, opening a hot air switch, testing the change of the heat flux on the surface of the glass fiber twill fabric in 80s, and removing the heat flow meter after the test is finished.
Step five: and after testing the wind speed of the wind outlet and the heat flux value of the surface of the sample to be tested, closing switches of the anemometer and the heat flow meter. And adjusting the distance between the lifting platform and the sample to be measured, and adjusting the height of the lifting platform so as to enable the lens of the thermal infrared imager to face the sample.
Step six: and opening the thermal infrared imager, setting the range of the test temperature and the test time, and entering a test page after the setting is finished. Adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, starting a testing page of the thermal infrared imager, opening a switch of the heat flow equipment, opening a hot air switch, starting testing, recording the change condition of a temperature cloud image on the back of the sample to be tested by using the thermal infrared imager, and obtaining a curve of the change of the back temperature of the sample to be tested along with time.
The test data obtained in the first and second embodiments are shown in fig. 4. And keeping the warp and weft densities of the fabric and the linear density of the yarns the same while keeping the loaded heat flux the same, wherein the temperature rise temperature of the back of the carbon fiber plain weave fabric is higher than that of the twill weave fabric. The reason is that different floating length lines are formed on the front and back sides of the fabric by the fabrics with different textures under the same other conditions, the interweaving times of the warp and weft yarns are different, the shorter the floating length lines are, the more the interweaving times are, the tighter the fabric is, and the less static air can be accommodated. The heat conductivity of the still air is much lower than that of the fibers, which slows down the heat transfer in the thickness direction of the fabric. The result obtained by the testing method of the invention is consistent with the theory.
The test data obtained in the third and fourth examples are shown in fig. 5. When the fabric tissue, the warp and weft yarn density and the yarn linear density are the same, the temperature curves of the back of the fabric are distributed differently when the distances from the air outlet of the heat flow generating device are different (namely, under different heat fluxes), and when the applied heat flux value is small, the temperature rise of the back is slow and is consistent with the actual situation.
Nothing in this specification is said to apply to the prior art.
Claims (1)
1. A method for testing the heat transfer performance of a textile under the impact of hot air flow is characterized in that the testing method is suitable for a thermal protection textile, and comprises the following steps:
the testing device comprises a sample table, a heat flow generating device, a flat plate, a slide way, a support, a clamp for fixing a sample on the support, a lifting table and a thermal infrared imager; the slide way is arranged on the sample table and comprises an inner pipe and an outer pipe, the inner pipe is fixed on the sample table, and the outer pipe can slide along the inner pipe; the distance between the sample to be measured and the air outlet is adjusted by sliding the outer tube; the inner pipe and the outer pipe are provided with limiting holes at certain intervals, and when the sample to be measured reaches a specified distance from the air outlet, the position of the outer pipe is fixed by inserting screws into the limiting holes;
the thermal flow generating device is arranged on one side of the slide way, the thermal infrared imager is arranged on the other side of the slide way through the lifting platform, and a lens of the thermal infrared imager is opposite to the sample to be detected; the flat plate is fixed on the outer tube, the support is L-shaped, the transverse section of the support is horizontally fixed on the flat plate, and the sample to be detected is fixed on the vertical section of the support on the side opposite to the heat flow generating device through the clamp;
a power switch, a cold/hot air switch and an air outlet are arranged on the shell of the heat flow generating device, and the air outlet is over against the sample to be detected; a high-speed motor, a fan and an electric heating wire are sequentially arranged in the air conditioner from left to right, and the electric heating wire is close to an air outlet; the commercial power is connected into the testing device through the power switch, the high-speed motor and the heating wire are respectively conducted with the commercial power, and the high-speed motor is axially connected with the fan; the cold/hot air switch is arranged on a conductive wire of the electric heating wire to control the conduction and the interruption of the electric heating wire and the commercial power;
a probe of the heat flow meter is fixed on the outer surface of the sample to be tested, which is right opposite to the air outlet, through a heat conduction paste so as to test the change of the surface heat flux of the sample to be tested;
a digital anemometer is additionally arranged to test the wind speed of the wind outlet;
the digital anemometer is German Testo 425;
the thermal infrared imager is American FLUKE;
the sample to be detected is a thermal protection textile;
the steps are as follows:
the method comprises the following steps: fixing the sample to be measured on the vertical section of the bracket flatly by using a plurality of clamps under the condition of not applying tension, so that the middle of the sample to be measured faces the air outlet;
step two: adjusting the distance between the sample and the air outlet, and fixing the tail end of the slide way by using screws to prevent the slide way from moving to cause measurement errors;
step three: turning on a switch of the heat flow generating device, pressing a power key of the digital anemometer to turn on and zero the anemometer, testing the wind speed of the air outlet, and measuring for multiple times to obtain an average value;
step four: fixing a probe of a heat flow meter on the surface of a sample to be tested by using a heat conduction paste, wherein the probe faces an air outlet, and opening a switch of the heat flow meter to test the change of the heat flux on the surface of the sample to be tested;
step five: after testing the wind speed of the wind outlet and the heat flux value of the surface of the sample to be tested, closing switches of the anemometer, the heat flow meter and the heat flow generating device; adjusting the distance between the lifting platform and a sample to be measured, and adjusting the height of the lifting platform so that a lens of the thermal infrared imager faces the sample;
step six: opening the thermal infrared imager, entering a setting page, and setting the range of the test temperature and the test time; entering a test page after the setting is finished; adjusting the distance between the sample to be tested and the air outlet and the thermal infrared imager, opening a switch of the heat flow generating device, opening a hot air switch, starting a testing page of the thermal infrared imager, starting testing, recording the change condition of a back temperature cloud chart of the sample to be tested in a testing area by using the thermal infrared imager, and obtaining a curve of the back temperature of the sample to be tested changing along with time.
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| CN109297901A (en) * | 2018-09-27 | 2019-02-01 | 天津工业大学 | A kind of textile freezes glutinous strength testing device and its test method |
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