CN116637789A - Electric heating coating suitable for wind tunnel test model with complex appearance and large curvature surface and preparation method thereof - Google Patents
Electric heating coating suitable for wind tunnel test model with complex appearance and large curvature surface and preparation method thereof Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 239000011248 coating agent Substances 0.000 title claims abstract description 74
- 238000000576 coating method Methods 0.000 title claims abstract description 74
- 238000005485 electric heating Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000005507 spraying Methods 0.000 claims abstract description 52
- 239000010410 layer Substances 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 230000007704 transition Effects 0.000 claims abstract description 14
- 239000011241 protective layer Substances 0.000 claims abstract description 9
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims abstract description 5
- 239000003973 paint Substances 0.000 claims description 38
- 238000001035 drying Methods 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 17
- 239000002966 varnish Substances 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 229910052802 copper Inorganic materials 0.000 claims description 15
- 239000010949 copper Substances 0.000 claims description 15
- 239000002390 adhesive tape Substances 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 14
- 229920002635 polyurethane Polymers 0.000 claims description 10
- 239000004814 polyurethane Substances 0.000 claims description 10
- 238000001723 curing Methods 0.000 claims description 7
- 238000003848 UV Light-Curing Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
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- 230000001788 irregular Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
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- 230000001678 irradiating effect Effects 0.000 description 3
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- 230000004069 differentiation Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/57—Three layers or more the last layer being a clear coat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
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Abstract
The invention relates to an electric heating coating suitable for a wind tunnel test model with a complex shape and a large curvature surface and a preparation method thereof, and belongs to the technical field of wind tunnel test models. The invention provides a preparation method of an electric heating coating suitable for a wind tunnel test model with complex appearance and large curvature surface, which comprises the steps of preparing an insulating layer, and preparing parallel conductive strips which are in serpentine series connection on the insulating layer to obtain the conductive layer; and spraying a protective layer on the surface of the conductive layer, and curing to obtain the electric heating coating. The invention solves the problem that the conventional rectangular heating film cannot conform to the surface of the complex large-curvature model, and reduces detection errors such as transition; short circuit problems can be checked and repaired in a targeted manner, so that time and material waste caused by large-area re-preparation of the coating are avoided.
Description
Technical Field
The invention belongs to the technical field of wind tunnel test models, and particularly relates to an electric heating coating suitable for a wind tunnel test model with a complex appearance and a large curvature surface and a preparation method thereof.
Background
The resistance of civil aircraft is generally constituted by differential pressure resistance, friction resistance, lift-induced resistance, which can be up to half of the total resistance in cruising conditions. Because the friction resistance of the turbulent boundary layer is far greater than that of the laminar boundary layer, the friction resistance of the wing can be effectively reduced by expanding the laminar range of the surface of the wing, and a considerable drag reduction effect is further provided.
The boundary position of the turbulence and the laminar flow is called a transition layer, and transition detection is an indispensable means in a laminar flow test flight test. The basic principle of transition detection is that the transition position is judged by measuring the surface temperature of the wing and utilizing the temperature difference before and after transition. The temperature resolution of the infrared technology is about 0.025k, and the transition measurement can be completely satisfied by utilizing the infrared camera. However, the model and the wind tunnel can not provide heat sources during wind tunnel test, so that the temperature difference between laminar flow and turbulent flow is not obvious, and the transition measurement is affected. Therefore, a large number of scientific researchers manually increase the temperature between the model and the wind tunnel airflow through heating the test model and shoot by being matched with an infrared camera, so that the transition position is measured.
The heating technology at the present stage has the following defects and shortcomings: firstly, for a large-curvature irregular curved surface model, as the surface expansion diagram of the model is an irregular sector combination, a conventional rectangular finished product heating film cannot conform to the surface of the large-curvature irregular curved surface model, so that the conventional rectangular heating film is overlapped when being adhered and cannot be tightly adhered to the model, and in an actual wind tunnel test, the heating film is adhered to the surface of the model by using adhesive glue, and tiny bubbles are inevitably remained at the interface between the heating film and the model. Generating air pressure difference under high-speed air flow, so that tiny air bubbles become larger to influence test results, even the whole heating film is lifted, and the test is seriously influenced; secondly, for a complex irregular plane shape model, because positive and negative electrodes are required to be arranged in parallel when an existing electric heating coating is prepared, and the shape of a wind tunnel test model is different, most of the surface is irregular, the heating coating cannot completely heat all the surfaces of the model, and ideal heating conditions cannot be achieved; thirdly, when the electric heating coating is prepared on the surface of the large-area metal test model by utilizing a pneumatic spraying method, the quality control difficulty of the insulating layer is high, the problem of local short circuit is easy to occur, leakage points cannot be found in a targeted manner, the coating preparation rework rate is high, the material cost is increased, and the efficiency is reduced; fourth, in the past, when spraying the conductive coating, the coating cannot conduct electricity when being thinner, the overall resistance is smaller when the coating is too thick, larger current is needed to drive when heating, the difficulty of arranging thick wires needed by large current is larger because the inner space of the model is limited, in addition, the requirement of the large current on power supply equipment is higher, and the overall heating difficulty is increased; fifth, wind tunnel test models are various, the measured parts of each wind tunnel test are different, and the existing heating film is generally rectangular and has a fixed size. For the unconventional wind tunnel test, the cost of customizing the heating film each time is high, the period is long, and the efficiency is low.
Disclosure of Invention
The invention provides an electric heating coating suitable for a wind tunnel test model with a complex shape and a large curvature surface and a preparation method thereof, which are used for solving the problems that the existing heating film and the existing conductive coating cannot be suitable for heating the surface with a large curvature irregular curved surface in a wind tunnel test, are difficult to maintain and have high cost.
The technical scheme of the invention is as follows:
the preparation method of the electric heating coating suitable for the wind tunnel test model with complex appearance and large curvature surface comprises the following steps:
uniformly spraying an insulating primer to a region to be tested on the surface of a wind tunnel test model, and curing to obtain an insulating layer;
dividing the surface of the insulating layer into parallel strips with the same width by using a PET adhesive tape;
step three, uniformly spraying conductive coating on the surface of the insulating layer of the parallel strips defined in the step two, and removing the PET adhesive tape stuck in the step two after the conductive coating is completely dried to obtain parallel conductive strips separated from each other;
the invention converts the model surface with the unfolded view of the irregular sector combination into the rectangular strip which is easy to operate by utilizing the differential principle, thereby solving the problem that the conventional rectangular heating film cannot conform to the complex large-curvature model surface. And the irregular plane model is paved by controlling the width and the length of the rectangular strip, so that the effect of uniformly heating the whole surface of the model is obtained.
Testing whether each parallel conductive strip is short-circuited with the metal surface of the wind tunnel test model, and after confirming that the short circuit is not generated, sequentially connecting the adjacent parallel conductive strips in series by using a conductive adhesive tape to obtain the parallel conductive strips which are in serpentine series connection;
the parallel conductive strips are connected in series, so that the problem that the conventional parallel electrode arrangement method cannot meet the requirement of full-surface heating is solved. The specific width and length of the parallel strips are selected according to the resistance values required by the heating area to be detected and the test requirement, so that the resistance of the parallel conductive strips can be increased to a certain extent, the control difficulty of the coating resistance is reduced, the same power supply current of each parallel conductive strip is ensured, and the parallel conductive strips are uniformly heated.
Filling gaps among the parallel conductive strips by using insulating UV resin, and obtaining a conductive heating layer after UV curing; the gap is filled up, so that the thickness of the coating is consistent, and the phenomenon that pits damage the surface quality of a test model to influence aerodynamic characteristics is avoided.
And step six, spraying a protective layer on the surface of the conductive heating layer obtained in the step five, and curing to obtain the electric heating coating.
The protective layer is used for protecting the heating layer, improving the infrared reflectivity of the whole coating, avoiding reflection and improving the quality of the image shot by the infrared camera.
Further, the curvature of the surface of the wind tunnel test model in the first step is less than or equal to 10m -1 。
Further, the insulating primer in the first step is polyurethane primer, the spraying thickness of the polyurethane primer is 10-20 mu m, and the polyurethane primer is completely cured after being naturally placed for 24 hours or baked for 1 hour at 60 ℃.
The polyurethane primer has good metal adhesion and insulativity, can avoid short circuit between the conductive heating layer and the metal model, avoid wind tunnel test failure caused by the existence of bubbles in the film, and prevent the coating from being damaged due to poor adhesion in the wind tunnel test process.
Further, in the second step, the width of the PET adhesive tape is 0.5-1.2 mm, and the width of the parallel strips is 3-10 cm. Further, the conductive paint in the third step is commercial conductive copper paint, the spraying thickness of the conductive copper paint is 10-20 mu m, and the conductive copper paint is completely dried after standing for 2 hours.
And step four, when the short circuit exists between the parallel conductive strips and the metal surface of the wind tunnel test model, removing the conductive paint at the short circuit part by using toluene solvent, shielding and protecting the surrounding area of the insulation layer from which the conductive paint is removed, spraying quick-drying self-spraying three-proofing paint onto the insulation layer from which the conductive paint is removed, after the quick-drying self-spraying three-proofing paint is dried, spraying the conductive paint onto the dried quick-drying self-spraying three-proofing paint surface, and after the conductive paint is dried, checking whether the short circuit exists between the parallel conductive strips and the metal surface of the wind tunnel test model.
The maintenance method can find the position of the local short circuit hole in a targeted manner, and avoid time and material waste caused by large-area re-preparation of the coating.
Further, the spraying thickness of the quick-drying self-spraying three-proofing paint is 10 mu m.
Further, the protective layer in the step six is quick-drying varnish, and the spraying thickness of the quick-drying varnish is 10-20 mu m.
The invention relates to an electric heating coating prepared by a preparation method of an electric heating coating suitable for a wind tunnel test model with a complex appearance and a large curvature surface.
Further, the using method of the electric heating coating comprises the steps of connecting a relay with the electric heating coating by utilizing a wire, electrifying the electric heating coating before blowing in a wind tunnel to increase the temperature of a region to be measured on the surface of the model, closing the relay when a flow field reaches a preset temperature value, and observing the transition position from an infrared successive heat map.
The invention has the beneficial effects that:
the preparation method of the electric heating coating provided by the invention utilizes the principle of differentiation of the slender strips to spread the wind tunnel model with the large curvature surface to arrange the full electric heating coating area, thereby solving the problem that the conventional rectangular heating film cannot conform to the surface of the complex large curvature model; the problem that the traditional parallel electrode arrangement method cannot meet the requirement of full-surface heating is solved by utilizing the principle of slender strip differentiation and the principle of resistor series connection, and detection errors such as transition are reduced; residual bubbles attached to the traditional heating film can be prevented from affecting wind tunnel test results by utilizing a pneumatic spraying method; each long and thin parallel conductive strip is mutually independent, and the short circuit problem can be checked and repaired in a targeted way, so that the time and material waste caused by large-area re-preparation of the coating are avoided; the overall resistance value of the coating can be effectively controlled by adjusting the size parameters such as the width of the heating strip and the like.
Drawings
FIG. 1 is a schematic diagram of the distribution of parallel conductive strips of the electrically heated coating of example 1;
FIG. 2 is a schematic diagram of the serpentine series arrangement of parallel conductive strips of the electrically heated coating of example 1;
FIG. 3 is a schematic diagram of the distribution of parallel conductive strips of the electrically heated coating of example 2;
fig. 4 is a schematic diagram of the serpentine series arrangement of parallel conductive strips of the electrically heated coating of example 2.
Detailed Description
The following embodiments are used for further illustrating the technical scheme of the present invention, but not limited thereto, and all modifications and equivalents of the technical scheme of the present invention are included in the scope of the present invention without departing from the spirit and scope of the technical scheme of the present invention. The process equipment or apparatus not specifically noted in the following examples are all conventional equipment or apparatus in the art, and the raw materials and the like used in the examples of the present invention are commercially available unless otherwise specified; unless specifically indicated, the technical means used in the embodiments of the present invention are conventional means well known to those skilled in the art.
Example 1
The embodiment provides an electric heating coating suitable for a wind tunnel test model with a complex appearance and a large curvature surface and a preparation method thereof.
The curvature of the surface of the area to be tested of the wind tunnel test model in the embodiment is 10m -1 Length of area to be measuredThe degree is 40cm, and the width is the same as the surface of the model.
The preparation method of the electric heating coating comprises the following steps:
uniformly spraying polyurethane primer to a region to be tested on the surface of a wind tunnel test model, wherein the spraying thickness is 20 mu m, and naturally standing for 24 hours to obtain a completely cured insulating layer; the area of the insulating layer is the same as that of the heating area to be measured.
Dividing the surface of the insulating layer into parallel strips with the same width by using a PET adhesive tape with the width of 1.0mm, and setting the width of the parallel strips to be 2cm and the length to be the same as the surface of the model according to the area of the insulating layer of the embodiment as shown in figure 1;
step three, uniformly spraying the conductive copper paint on the surface of the insulating layer of the delimited parallel strips in the step two, wherein the spraying thickness is 20 mu m, and standing for 2 hours to completely dry the conductive copper paint; removing the PET adhesive tape stuck in the second step to obtain parallel conductive strips separated from each other with a gap of 1.0 mm; the conductive copper paint used in this example is a commercially available product.
Testing whether each independent parallel conductive strip is short-circuited with the metal surface of the wind tunnel test model by using an external meter; after confirming that no short circuit exists, connecting adjacent parallel conductive strips in series end to end sequentially by using a double-sided conductive tape, and obtaining the parallel conductive strips which are connected in series in a serpentine shape as shown in fig. 2;
filling gaps among the parallel conductive strips by using insulating UV resin, irradiating the insulating UV resin by using an ultraviolet lamp to cure the insulating UV resin, and polishing the insulating UV curing resin to obtain a conductive heating layer;
step six, spraying quick-drying varnish on the surface of the conductive heating layer obtained in the step five as a protective layer, wherein the spraying thickness of the quick-drying varnish is 20 mu m; and (3) obtaining a large curvature surface wind tunnel test model to-be-transition test area with the electric heating coating after curing.
The quick-drying varnish used in this example was Baomeuan ultra-quick-drying varnish 8017.
According to the specific application method of the heating coating prepared in the embodiment, the relay is connected with the electric heating coating and the constant voltage power supply through the lead, and the relay is controlled to be switched on and switched off by the computer during test, so that the constant voltage power supply is regulated to obtain ideal power.
During the test, the relay is opened before the wind tunnel blows, the region to be tested is observed through the infrared camera, when the temperature reaches the requirement, the relay is closed for blowing, and when the flow field reaches the preset condition, the transition position is shot. Connecting the relay with the arrangement electrode by using a wire; electrifying and heating the coating before blowing in the wind tunnel to raise the temperature of the region to be tested of the model; and when the flow field reaches a preset value, the relay is closed, and the transition position can be observed from the infrared camera heat map.
And step four of the embodiment, if short circuit exists between the parallel conductive strips and the metal surface of the wind tunnel test model, maintaining according to the following method:
removing the short-circuit part conductive paint by using toluene solvent, shielding and protecting the surrounding area of the insulation layer from which the conductive paint is removed, spraying quick-drying self-spraying three-proofing paint onto the insulation layer from which the conductive paint is removed, wherein the spraying thickness is 10 mu m, spraying the conductive paint onto the surface of the dried quick-drying self-spraying three-proofing paint after the quick-drying self-spraying three-proofing paint is dried, and checking whether the parallel conductive strips and the metal surface of the wind tunnel test model still have short circuits after the conductive paint is dried.
The invention provides a preparation method of an electric heating coating, which is suitable for a wind tunnel test model with complex appearance and large curvature surface, has good local maintenance performance and easy control of integral resistance, and particularly adopts a differential slender strip heating layer, so that the limitation that the electric heating film and the electric heating coating are influenced by the shape of the model in the past is effectively solved by utilizing the resistance series principle, the short circuit fault part can be checked and maintained in a targeted manner, the resistance of the electric heating coating can be effectively controlled, the time and the material cost are saved, the method can be applied to a wind tunnel test with complex plane or curved surface, the application range is greatly expanded, and the method has universal applicability.
Example 2
The embodiment provides an electric heating coating suitable for a wind tunnel test model with a complex appearance and a large curvature surface and a preparation method thereof.
In this embodiment, the curve of the surface of the area to be measured of the wind tunnel test modelThe rate is 2m -1 The length of the region to be measured is 40cm, and the width is the same as the surface of the model.
The preparation method of the electric heating coating comprises the following steps:
uniformly spraying polyurethane primer to a region to be tested on the surface of a wind tunnel test model, wherein the spraying thickness is 10 mu m, and naturally standing for 24 hours to obtain a completely cured insulating layer; the area of the insulating layer is the same as that of the heating area to be measured.
Dividing the surface of the insulating layer into parallel strips with the same width by using a PET adhesive tape with the width of 1.2mm, and setting the width of the parallel strips to be 4cm and the length to be the same as the surface of the model according to the area of the insulating layer of the embodiment as shown in figure 3;
step three, uniformly spraying the conductive copper paint on the surface of the insulating layer of the delimited parallel strips in the step two, wherein the spraying thickness is 10 mu m, and standing for 2 hours to completely dry the conductive copper paint; removing the PET adhesive tape stuck in the second step to obtain parallel conductive strips separated from each other with a gap of 1.2 mm; the conductive copper paint used in this example is a commercially available product.
Testing whether each independent parallel conductive strip is short-circuited with the metal surface of the wind tunnel test model by using an external meter; after confirming that no short circuit exists, connecting adjacent parallel conductive strips in series end to end sequentially by using double-sided conductive tapes, and obtaining the parallel conductive strips which are connected in series in a serpentine shape as shown in fig. 4;
filling gaps among the parallel conductive strips by using insulating UV resin, irradiating the insulating UV resin by using an ultraviolet lamp to cure the insulating UV resin, and polishing the insulating UV curing resin to obtain a conductive heating layer;
step six, spraying quick-drying varnish on the surface of the conductive heating layer obtained in the step five as a protective layer, wherein the spraying thickness of the quick-drying varnish is 10 mu m; and (3) obtaining a large curvature surface wind tunnel test model to-be-transition test area with the electric heating coating after curing.
The quick-drying varnish used in this example was Baomeuan ultra-quick-drying varnish 8017.
Example 3
The embodiment provides an electric heating coating suitable for a wind tunnel test model with a complex appearance and a large curvature surface and a preparation method thereof.
The curvature of the surface of the area to be tested of the wind tunnel test model in the embodiment is 1m -1 The length of the region to be measured is 40cm, and the width is the same as the surface of the model.
The preparation method of the electric heating coating comprises the following steps:
uniformly spraying polyurethane primer to a region to be tested on the surface of a wind tunnel test model, wherein the spraying thickness is 15 mu m, and naturally standing for 24 hours to obtain a completely cured insulating layer; the area of the insulating layer is the same as that of the heating area to be measured.
Dividing the surface of the insulating layer into parallel strips with the same width by using a PET adhesive tape with the width of 0.5mm, setting the width of the parallel strips to be 1cm according to the area of the insulating layer, and setting the length of the parallel strips to be the same as the surface of the model;
step three, uniformly spraying the conductive copper paint on the surface of the insulating layer of the delimited parallel strips in the step two, wherein the spraying thickness is 15 mu m, and standing for 2 hours to completely dry the conductive copper paint; removing the PET adhesive tape stuck in the second step to obtain parallel conductive strips separated from each other with a gap of 0.5 mm; the conductive copper paint used in this example is a commercially available product.
Testing whether each independent parallel conductive strip is short-circuited with the metal surface of the wind tunnel test model by using an external meter; after confirming that no short circuit exists, connecting adjacent parallel conductive strips in series by using double-sided conductive tapes in sequence, and obtaining the parallel conductive strips which are connected in series in a serpentine shape;
filling gaps among the parallel conductive strips by using insulating UV resin, irradiating the insulating UV resin by using an ultraviolet lamp to cure the insulating UV resin, and polishing the insulating UV curing resin to obtain a conductive heating layer;
step six, spraying quick-drying varnish on the surface of the conductive heating layer obtained in the step five as a protective layer, wherein the spraying thickness of the quick-drying varnish is 15 mu m; and (3) obtaining a large curvature surface wind tunnel test model to-be-transition test area with the electric heating coating after curing.
The quick-drying varnish used in this example was Baomeuan ultra-quick-drying varnish 8017.
The specific protection scope of the present invention is not limited to the above explanation, and any simple replacement or modification within the scope of the technical idea disclosed in the present invention and according to the technical scheme of the present invention should be within the protection scope of the present invention.
Claims (10)
1. The preparation method of the electric heating coating suitable for the wind tunnel test model with the complex appearance and the large curvature surface is characterized by comprising the following steps:
uniformly spraying an insulating primer to a region to be tested on the surface of a wind tunnel test model, and curing to obtain an insulating layer;
dividing the surface of the insulating layer into parallel strips with the same width by using a PET adhesive tape;
step three, uniformly spraying conductive coating on the surface of the insulating layer of the parallel strips defined in the step two, and removing the PET adhesive tape stuck in the step two after the conductive coating is completely dried to obtain parallel conductive strips separated from each other;
testing whether each parallel conductive strip is short-circuited with the metal surface of the wind tunnel test model, and after confirming that the short circuit is not generated, sequentially connecting the adjacent parallel conductive strips in series by using a conductive adhesive tape to obtain the parallel conductive strips which are in serpentine series connection;
filling gaps among the parallel conductive strips by using insulating UV resin, and obtaining a conductive heating layer after UV curing;
and step six, spraying a protective layer on the surface of the conductive heating layer obtained in the step five, and curing to obtain the electric heating coating.
2. The method for preparing the electric heating coating applicable to the wind tunnel test model with complex appearance and large curvature surface according to claim 1, wherein the curvature of the wind tunnel test model surface is less than or equal to 10m in the step one -1 。
3. The method for preparing the electric heating coating for the wind tunnel test model with the complex appearance and the large curvature surface according to claim 1 or 2, wherein in the step one, the insulating primer is polyurethane primer, the spraying thickness of the polyurethane primer is 10-20 mu m, and the polyurethane primer is completely cured after being naturally placed for 24 hours or baked for 1 hour at 60 ℃.
4. The method for preparing the electric heating coating for the wind tunnel test model with the complex appearance and the large curvature surface according to claim 3, wherein the width of the PET adhesive tape in the second step is 0.5-1.2 mm, and the width of the parallel strips is 3-10 cm.
5. The method for preparing the electric heating coating for the wind tunnel test model with the complex appearance and the large curvature surface according to claim 4, wherein the conductive paint in the third step is commercially available conductive copper paint, the spraying thickness of the conductive copper paint is 10-20 mu m, and the conductive copper paint is completely dried after standing for 2 hours.
6. The method for preparing the electric heating coating for the wind tunnel test model with the complex appearance and the large curvature surface according to claim 5, wherein when the short circuit exists between the parallel conductive strips and the metal surface of the wind tunnel test model, toluene solvent is utilized to remove the conductive coating on the short circuit part, shielding protection is carried out on the surrounding area of the insulating layer of the removed conductive coating, quick-drying self-spraying three-proofing paint is sprayed on the insulating layer of the removed conductive coating, after the quick-drying self-spraying three-proofing paint is dried, the conductive coating is sprayed on the dried quick-drying self-spraying three-proofing paint surface, and after the conductive coating is dried, whether the short circuit exists between the parallel conductive strips and the metal surface of the wind tunnel test model is checked.
7. The method for preparing the electric heating coating suitable for the wind tunnel test model of the complex-shaped and large-curvature surface, which is disclosed in claim 6, is characterized in that the spraying thickness of the quick-drying self-spraying three-proofing paint is 10 microns.
8. The method for preparing an electric heating coating for a wind tunnel test model with complex appearance and large curvature according to claim 7, wherein the protective layer in the step six is quick-drying varnish, and the spraying thickness of the quick-drying varnish is 10-20 μm.
9. An electrically heated coating as in any of claims 1-8, adapted for use in a complex profile and high curvature surface wind tunnel test model.
10. The electric heating coating according to claim 9, wherein the electric heating coating is used by connecting a relay with the electric heating coating by using a wire, and electrifying the electric heating coating before blowing in a wind tunnel to raise the temperature of a region to be measured on the surface of the model, and when the flow field reaches a preset temperature value, closing the relay, and observing the transition position from an infrared successive heat map.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310606742.8A CN116637789B (en) | 2023-05-26 | 2023-05-26 | Electric heating coating suitable for wind tunnel test model with complex appearance and large curvature surface and preparation method thereof |
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| CN202310606742.8A CN116637789B (en) | 2023-05-26 | 2023-05-26 | Electric heating coating suitable for wind tunnel test model with complex appearance and large curvature surface and preparation method thereof |
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| CN116637789A true CN116637789A (en) | 2023-08-25 |
| CN116637789B CN116637789B (en) | 2024-01-23 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB690696A (en) * | 1949-03-17 | 1953-04-29 | Harold Vezey Strong | Improvements relating to the manufacture of coated strip material for use in making eectric circuit components or printed circuits |
| EP0878980A2 (en) * | 1997-05-09 | 1998-11-18 | Sanchez Duque, David | Process to manufacture heating panels and panels obtained therefrom |
| CN115261770A (en) * | 2022-06-20 | 2022-11-01 | 北京强度环境研究所 | Thermal spraying installation process for surface resistance strain gauge of thermal structure |
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2023
- 2023-05-26 CN CN202310606742.8A patent/CN116637789B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB690696A (en) * | 1949-03-17 | 1953-04-29 | Harold Vezey Strong | Improvements relating to the manufacture of coated strip material for use in making eectric circuit components or printed circuits |
| EP0878980A2 (en) * | 1997-05-09 | 1998-11-18 | Sanchez Duque, David | Process to manufacture heating panels and panels obtained therefrom |
| CN115261770A (en) * | 2022-06-20 | 2022-11-01 | 北京强度环境研究所 | Thermal spraying installation process for surface resistance strain gauge of thermal structure |
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| CN116637789B (en) | 2024-01-23 |
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