CN112629807B - Method for removing ice growing on surface of silk thread hot knife and model - Google Patents
Method for removing ice growing on surface of silk thread hot knife and model Download PDFInfo
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- CN112629807B CN112629807B CN202110253848.5A CN202110253848A CN112629807B CN 112629807 B CN112629807 B CN 112629807B CN 202110253848 A CN202110253848 A CN 202110253848A CN 112629807 B CN112629807 B CN 112629807B
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- 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
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
Abstract
The invention is suitable for the technical field of wind tunnel tests and provides a method for removing ice growth on the surface of a silk thread hot knife and a model, wherein the method for removing the ice growth on the surface of the model comprises the following steps: heating the wire heating knife to a set temperature; bending a silk thread hot knife, and attaching the bent silk thread hot knife to the surface of a model, wherein the surface of the model is provided with a growing ice pattern; and pulling the wire hot knife towards the axial direction of the model in a manner of keeping the wire hot knife attached to the surface of the model. When the ice type grows on the surface of the model, the structure of the model cannot be damaged, the deicing efficiency is high, and potential safety hazards are avoided.
Description
Technical Field
The invention belongs to the technical field of wind tunnel tests, and particularly relates to a method for removing ice growing on surfaces of a silk thread hot knife and a model.
Background
The icing wind tunnel test is mainly used for evaluating the performance change influence caused by surface icing when the aircraft flies in an icing cloud environment. During testing, the aircraft model is installed and fixed in the wind tunnel test section, and the flying state of the aircraft in the aerial cloud and mist environment is simulated by manufacturing the flying cloud and mist environment. After the icing test, the surface of the aircraft model can be condensed into ice forms with certain thickness, the grown ice forms are test results, the change quantity of the appearance surface of the aircraft in the flying process under the corresponding cloud and fog environment is also represented, and the influences of the icing on the change of the specific aerodynamic performance of the aircraft and the like can be evaluated after the ice form results are obtained.
The ice types grown by different cloud and mist environmental parameters are different, so that the icing influence is different. Generally, icing wind tunnel tests need to find out icing influences under all state parameters, namely after one test is finished, the next test with different parameters needs to be carried out. Before the next test, the surface of the aircraft model needs to be cleaned of the ice type result generated in the previous test, namely, the surface of the aircraft model needs to be deiced, so that the precision of the test is ensured. The conventional deicing method comprises the following three steps: knocking and smashing, burning with fire and rubbing with cloth. The ice type growing on the surface of the model is generally hard and solid, so firstly, a hammer is used for knocking and smashing, hard and large blocks of ice are knocked off from the surface of the model, secondly, burning is needed, small blocks of ice types remained on the surface of the model after knocking and smashing are melted and removed, thirdly, cloth wiping is carried out, and the ice type residual water after burning is wiped off by using the cloth. And returning the surface of the aircraft test model to the original state, and starting the next test research.
The conventional deicing method has more defects, firstly, the vibration influence caused by the knocking and smashing mode is large, the surface of an aircraft model is generally of a skin structure, the large vibration can generate certain damage influence on the structure, and particularly for instrument equipment such as a temperature sensor and the like adhered to the surface of the model, the vibration damage influence is large; secondly, the pipeline direct supply of natural gas is impossible in the wind tunnel, ignition is generally realized by a pressure and pressure increasing valve device with a portable gas bottle, the internal temperature of the wind tunnel is lower than zero degree during an icing test, the temperature is lower, the low-temperature resistance of the conventional gas bottle, the pressure reducing valve and other devices is insufficient, the stability during ignition is not high, the control is not flexible, the situation of sudden change of fire frequently occurs, and the potential safety hazard caused by sudden change of fire is larger.
Therefore, researches on a novel method and a novel device for deicing the surface of the model after the icing test are urgently needed, so that the test efficiency is improved, and the potential safety hazard is reduced.
In summary, after the icing wind tunnel test, when removing the ice pattern on the surface of the model in the prior art, the following defects exist: the structure of the model is easy to damage; the deicing efficiency is low; has certain potential safety hazard.
Disclosure of Invention
The invention aims to provide a silk thread hot knife and a method for removing ice growing on the surface of a model, and aims to solve the technical problems that the model structure is easy to damage, the deicing efficiency is low, and certain potential safety hazards exist in the prior art.
In a first aspect, the invention provides a wire thermal knife, which comprises a protective layer, an insulating heat conduction layer, a heating control layer and an insulating shaft, wherein the heating control layer is wound on the insulating shaft, the insulating heat conduction layer covers the outside of the heating control layer, the protective layer covers the outside of the insulating heat conduction layer, the protective layer, the insulating heat conduction layer, the heating control layer and the insulating shaft are all in a linear structure, and the protective layer, the insulating heat conduction layer, the heating control layer and the insulating shaft can be bent at will; and handle parts are formed at two ends of the silk thread hot knife.
Further, the heating control layer comprises a heating component and a temperature sensing component, wherein the heating component is an electric heating wire.
Furthermore, the insulating heat conduction layer is made of polyimide, and the protective layer is made of wear-resistant metal or wear-resistant plastic.
Further, the protective layer, the insulating heat conduction layer, the heating control layer and the insulating shaft are bonded by glue, and are molded by hot pressing through a mold, wherein the glue has the characteristics of heat conduction and high temperature resistance.
Further, the insulating shaft is made of plastic.
In a second aspect, the present invention provides a method for removing ice growth on a surface of a mold, comprising the steps of:
step S10: heating the wire thermal knife to a set temperature, wherein the wire thermal knife comprises a protective layer, an insulating heat conduction layer, a heating control layer and an insulating shaft, the heating control layer is wound on the insulating shaft, the insulating heat conduction layer covers the outside of the heating control layer, the protective layer covers the outside of the insulating heat conduction layer, the protective layer, the insulating heat conduction layer, the heating control layer and the insulating shaft are all of linear structures, and the protective layer, the insulating heat conduction layer, the heating control layer and the insulating shaft can be bent at will; forming handle parts at two ends of the silk thread hot knife;
step S20: bending a silk thread hot knife, and attaching the bent silk thread hot knife to the surface of a model, wherein the surface of the model is provided with a growing ice pattern;
step S30: and pulling the wire hot knife towards the axial direction of the model in a manner of keeping the wire hot knife attached to the surface of the model.
Further, in step S30, the hot wire knife is pulled from top to bottom.
Further, the method also comprises the following steps:
step S40: and wiping off residual water on the surface of the model after the ice growth is cut off.
Further, the set temperature is determined according to the type of the growing ice type.
Further, when the growing ice is frost ice, the set temperature is 100-150 ℃; when the growing ice type is open ice or mixed ice, the set temperature is 150-180 ℃.
Compared with the prior art, the invention at least has the following technical effects:
1. the invention innovatively uses the principle of film heating for cutting the growing ice on the surface of the model and designs a corresponding film structure;
2. according to the invention, the hot wire cutter is pulled in a manner of attaching the hot wire cutter to the surface of the model without knocking and smashing, and the structure of the model is not damaged in the whole process; on the other hand, most of the growing ice on the surface of the model can be removed by pulling the wire hot knife to remove the growing ice on the surface of the model, so that the removing efficiency is high; furthermore, in the process of pulling the thread hot knife to remove the grown ice patterns on the surface of the model, even if the thread hot knife cannot completely remove the grown ice patterns on the surface of the model by hundreds, the grown ice patterns which are not removed are melted under the heating of the thread hot knife;
3. the present invention also determines the set temperature according to the type of the growing ice type, thereby further improving the removal efficiency of the growing ice type on the surface of the model.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a hot filament cutter according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a method for removing grown ice from the surface of a mold according to a second embodiment of the present invention;
FIG. 3 is a schematic view of the growing ice pattern with the mold surface removed according to the second embodiment of the present invention;
fig. 4 is a positional relationship diagram of the filament hot knife and the model in the second embodiment of the present invention.
Description of reference numerals:
10-a protective layer; 20-a heating control layer; 30-an insulated shaft; 100-wire hot knife; m-model; 311-supply lines; 321-temperature feedback line; 40-wind tunnel wall plate.
Detailed Description
Aspects of the present invention will be described more fully hereinafter with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the present invention is intended to encompass any aspect disclosed herein, whether alone or in combination with any other aspect of the invention to accomplish any aspect disclosed herein. For example, it may be implemented using any number of the apparatus or performing methods set forth herein. In addition, the scope of the present invention is intended to cover apparatuses or methods implemented with other structure, functionality, or structure and functionality in addition to the various aspects of the invention set forth herein. It is to be understood that any aspect disclosed herein may be embodied by one or more elements of a claim.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or modes, but do not preclude the presence or addition of one or more other features, steps, operations, or modes.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
Example one
A first embodiment of the present invention provides a filament yarn hot knife, as shown in fig. 1, which is a structural diagram of a filament yarn hot knife in a first embodiment of the present invention, the filament yarn hot knife in the first embodiment of the present invention includes a protective layer 10, an insulating and heat conducting layer (not shown), a heating control layer 20, and an insulating shaft 30, wherein the heating control layer 20 is wound on the insulating shaft 30, the insulating and heat conducting layer covers the outside of the heating control layer 20, the protective layer 10 covers the outside of the insulating and heat conducting layer, the protective layer 10, the insulating and heat conducting layer, the heating control layer 20, and the insulating shaft 30 are all linear structures, and the protective layer 10, the insulating and heat conducting layer, the heating control layer 20, and the insulating shaft 30 can be bent arbitrarily; and handle parts are formed at two ends of the silk thread hot knife.
It should be noted that, in fig. 1, the protective layer 10 does not wrap the heating control layer 20 and the insulating shaft 30, but only for clarity, in fact, the protective layer 10 in the first embodiment of the present invention completely wraps the heating control layer 20 and the insulating shaft 30.
The filament hot knife in the first embodiment of the invention forms a linear structure, the heating control layer 20 is arranged in the filament hot knife, the temperature of the filament hot knife can be raised to a set temperature by controlling the electric heating power, and the filament hot knife can be bent at will to be attached to the surface of a model, so that the growing ice can be removed.
It should be noted that the innovation of the present invention is not the technology of heating the cable structure, and actually heating the cable structure, which belongs to a conventional technology, and one of the innovations of the present invention is to form a thread hot knife by arranging a multi-layer structure, that is, one of the innovations of the present invention is to use the principle of thread heating for cutting the ice-grown form on the surface of the model and design the corresponding thread structure.
Further, the heating control layer 20 includes a heating component and a temperature sensing component, wherein the heating component is an electric heating wire.
Further, the insulating and heat conducting layer is made of polyimide, so that the insulating and heat conducting layer has good insulating performance and good heat conducting performance, and heat of the heating assembly is transferred to the protective layer 10;
the protective layer 10 is made of wear-resistant metal or wear-resistant plastic so as to prolong the service life.
Further, for convenience of manufacturing, the protective layer 10, the insulating heat conduction layer, the heating control layer 20 and the insulating shaft 30 are bonded by glue, and are hot-pressed by a mold, wherein the glue has heat conduction and high temperature resistance.
Further, in order to make the insulating shaft 30 have both insulating property and flexibility to facilitate the removal of the ice growth on the surface of the model, the insulating shaft 30 is made of plastic.
Example two
Fig. 2 is a schematic diagram illustrating a method for removing ice on a mold surface according to a second embodiment of the present invention, where the method for removing ice on a mold surface according to the second embodiment of the present invention includes the following steps:
step S10: heating the filament hot knife to a set temperature, wherein the filament hot knife comprises a protective layer 10, an insulating heat conduction layer, a heating control layer 20 and an insulating shaft 30, the heating control layer 20 is wound on the insulating shaft 30, the insulating heat conduction layer covers the outside of the heating control layer 20, the protective layer 10 covers the outside of the insulating heat conduction layer, the protective layer 10, the insulating heat conduction layer, the heating control layer 20 and the insulating shaft 30 are all linear structures, and the protective layer 10, the insulating heat conduction layer, the heating control layer 20 and the insulating shaft 30 can be bent at will; forming handle parts at two ends of the silk thread hot knife;
FIG. 3 is a schematic view of the pattern of the second embodiment of the present invention showing the removal of the ice on the surface of the pattern, in order to use the filament hot knife 100 and the patternMThe relationship of (a) is clear and, therefore, the growing ice pattern is omitted in fig. 3.
Model (model)MDuring icing wind tunnel test, the model is arranged on a wind tunnel wall plate 40, and after the icing wind tunnel test, the model is arranged on the modelMThe growth ice type is formed;
the power supply line 311 is used to supply power to the wire thermal knife 100, and the temperature feedback line 321 is used to feed back the temperature of the wire thermal knife 100.
Step S20: bending a silk thread hot knife, and attaching the bent silk thread hot knife to the surface of a model, wherein the surface of the model is provided with a growing ice pattern;
FIG. 4 is a diagram showing a positional relationship between the filament hot knife and the mold according to a second embodiment of the present invention; after the wire heat knife 100 is attached to the mold surface, the wire heat knife 100 will be between the growing ice form and the mold surface.
Step S30: and pulling the wire hot knife towards the axial direction of the model in a manner of keeping the wire hot knife attached to the surface of the model.
In the second embodiment of the invention, the method for removing the ice growing on the surface of the model does not need to be knocked and smashed, and the silk thread hot knife is pulled in a manner of being attached to the surface of the model, so that the structure of the model cannot be damaged in the whole process; on the other hand, most of the growing ice on the surface of the model can be removed by pulling the wire hot knife to remove the growing ice on the surface of the model, so that the removing efficiency is high; furthermore, in the process of pulling the thread hot knife to remove the grown ice patterns on the surface of the model, even if the thread hot knife cannot completely remove the grown ice patterns on the surface of the model by hundreds, the grown ice patterns which are not removed are melted under the heating of the thread hot knife; finally, the second embodiment of the invention does not need a fire burning mode, and the operation is very safe.
Further, in order to cut the separated growing ice type or to make the melted water fall down to avoid secondary icing, the wire hot knife is pulled from top to bottom.
Further, in order to prevent the residual moisture on the surface of the model from forming secondary icing, the method further comprises the step S40: and wiping off residual water on the surface of the model after the ice growth is cut off.
Further, in order to further improve the removal efficiency of the grown ice form on the surface of the mold, the set temperature is determined according to the type of the grown ice form.
Specifically, when the growing ice is frost ice, the set temperature is 100-150 ℃; when the growing ice type is open ice or mixed ice, the set temperature is 150-180 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for removing ice growth on a mold surface, comprising the steps of:
step S10: heating the filament hot knife to a set temperature, wherein the filament hot knife comprises a protective layer (10), an insulating heat conduction layer, a heating control layer (20) and an insulating shaft (30), the heating control layer (20) is wound on the insulating shaft (30), the insulating heat conduction layer covers the outside of the heating control layer (20), the protective layer (10) covers the outside of the insulating heat conduction layer, the protective layer (10), the insulating heat conduction layer, the heating control layer (20) and the insulating shaft (30) are all of linear structures, and the protective layer (10), the insulating heat conduction layer, the heating control layer (20) and the insulating shaft (30) can be bent at will; forming handle parts at two ends of the silk thread hot knife;
step S20: bending a silk thread hot knife, and attaching the bent silk thread hot knife to the surface of a model, wherein the surface of the model is provided with a growing ice pattern;
step S30: and pulling the wire hot knife towards the axial direction of the model in a manner of keeping the wire hot knife attached to the surface of the model.
2. The method of claim 1, wherein in step S30, the hot wire knife is pulled from top to bottom.
3. The method of claim 2, further comprising the steps of: step S40: and wiping off residual water on the surface of the model after the ice growth is cut off.
4. The method of claim 3, wherein the set temperature is determined according to a type of the ice-grown form.
5. The method for removing ice on a mold surface according to claim 4, wherein when the ice is frost ice, the temperature is set to 100 ℃ to 150 ℃; when the growing ice type is open ice or mixed ice, the set temperature is 150-180 ℃.
6. The hot wire cutter is characterized by comprising a protective layer (10), an insulating heat conduction layer, a heating control layer (20) and an insulating shaft (30), wherein the heating control layer (20) is wound on the insulating shaft (30), the insulating heat conduction layer covers the outside of the heating control layer (20), the protective layer (10) covers the outside of the insulating heat conduction layer, the protective layer (10), the insulating heat conduction layer, the heating control layer (20) and the insulating shaft (30) are all linear structures, and the protective layer (10), the insulating heat conduction layer, the heating control layer (20) and the insulating shaft (30) can be bent at will; forming handle parts at two ends of the silk thread hot knife; when in use, the silk thread hot knife is heated to a set temperature; bending a silk thread hot knife, and attaching the bent silk thread hot knife to the surface of a model, wherein the surface of the model is provided with a growing ice pattern; and pulling the wire hot knife towards the axial direction of the model in a manner of keeping the wire hot knife attached to the surface of the model.
7. The hot filament knife of claim 6, wherein the heat control layer (20) comprises a heating element and a temperature sensing element, wherein the heating element is an electrical heating wire.
8. The filament hot knife according to claim 7, characterized in that the insulating and heat conducting layer is made of polyimide, and the protective layer (10) is made of wear-resistant metal or wear-resistant plastic.
9. The hot wire cutter according to claim 8, wherein the protective layer (10), the insulating and heat conducting layer, the heating control layer (20) and the insulating shaft (30) are bonded together by glue, and are hot-pressed by a mold, and the glue has heat conducting and high temperature resistant properties.
10. A hot wire cutter as claimed in claim 9, wherein the insulating shaft (30) is made of plastic.
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| CN202110253848.5A CN112629807B (en) | 2021-03-09 | 2021-03-09 | Method for removing ice growing on surface of silk thread hot knife and model |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113483511B (en) * | 2021-09-07 | 2021-11-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Ice-shaped cutter, ice-shaped measuring device and ice-shaped measuring method |
| CN113483513B (en) * | 2021-09-07 | 2021-11-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Water-absorbable ice-shaped cutter, ice-shaped measuring device and ice-shaped measuring method |
| CN113483512B (en) * | 2021-09-07 | 2021-11-23 | 中国空气动力研究与发展中心低速空气动力研究所 | Icing wind tunnel test ice-shaped cutting device and cutting method |
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| US5412181A (en) * | 1993-12-27 | 1995-05-02 | The B. F. Goodrich Company | Variable power density heating using stranded resistance wire |
| EP1242280A4 (en) * | 1999-12-30 | 2006-02-22 | Dartmouth College | System and method for an electrical de-icing coating |
| WO2010049063A2 (en) * | 2008-10-14 | 2010-05-06 | Airbus Operations Gmbh | Heating system having at least one electrothermal heating layer, a structural component having such a heating layer, a heating method and a method for producing a semi-finished component or a component having a heating device |
| CN201800053U (en) * | 2010-09-29 | 2011-04-20 | 姚丽珍 | Ice cutter |
| US20140014776A1 (en) * | 2012-07-13 | 2014-01-16 | Kelly Aerospace Thermal Systems Llc | System containing an electric heating element and method for installation and use thereof |
| US9193466B2 (en) * | 2012-07-13 | 2015-11-24 | Mra Systems, Inc. | Aircraft ice protection system and method |
| CN102862169A (en) * | 2012-09-28 | 2013-01-09 | 苏州萃智新技术开发有限公司 | Multifunctional kitchen cutting tool |
| EP2873617B1 (en) * | 2013-11-13 | 2020-07-01 | Airbus Defence and Space GmbH | Device and method for de-icing and/or avoiding ice-buildup and profiled body and aircraft equipped with such a device |
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