CN113778145A - Condensation structure is prevented to low temperature flow field observation experiment observation window glass's intelligence - Google Patents
Condensation structure is prevented to low temperature flow field observation experiment observation window glass's intelligence Download PDFInfo
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- CN113778145A CN113778145A CN202111067735.2A CN202111067735A CN113778145A CN 113778145 A CN113778145 A CN 113778145A CN 202111067735 A CN202111067735 A CN 202111067735A CN 113778145 A CN113778145 A CN 113778145A
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- 238000009833 condensation Methods 0.000 title claims abstract description 45
- 238000002474 experimental method Methods 0.000 title claims abstract description 41
- 239000005357 flat glass Substances 0.000 title claims abstract description 24
- 230000005494 condensation Effects 0.000 title abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000011521 glass Substances 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 17
- 229920006395 saturated elastomer Polymers 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 7
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 10
- 239000000463 material Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D22/00—Control of humidity
- G05D22/02—Control of humidity characterised by the use of electric means
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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
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Abstract
The invention discloses an intelligent anti-condensation structure of observation window glass for a low-temperature flow field observation experiment, which comprises an experiment section, an observation window, a cover body, a camera and a nitrogen source, wherein the observation window is fixedly arranged on the experiment section; the cover body is fixedly arranged on the experimental section and covers the observation window, an observation cavity is enclosed between the cover body and the outer wall of the experimental section, the camera is fixedly arranged on the cover body, and a lens of the camera is positioned in the observation cavity and faces the observation window; the cover body is provided with an air inlet structure and an air outlet structure which can be communicated with the observation cavity and the external environment, and the air inlet structure is connected with the nitrogen source through a pipeline. This structure adopts installs the nitrogen gas source additional on the glass window to last steady mode with isolated air of observing chamber input nitrogen gas, and then solve glass observation window condensation difficult problem, simple structure moreover implements effectively, is applicable to the observation condition of multiple flow field, and convenient operation easily realizes.
Description
Technical Field
The invention relates to the technical field of aircraft propulsion systems, in particular to an intelligent anti-condensation structure of low-temperature flow field observation experiment observation window glass.
Background
In the field of hypersonic aircraft propulsion system research, with the ongoing study of flow problems, more and more scholars recognize that the effect of aircraft surface temperature on flow problems is of paramount importance. The problems of complex flow fields such as shock wave/boundary layer interference and the like under extreme temperature conditions, new challenges brought to heat transfer problems by shock wave/boundary layer interference, icing and frosting problems in convection heat exchange of the surface of a precooling air inlet channel and the like are key problems restricting the development of the hypersonic propulsion technology. Therefore, scholars at home and abroad carry out a large number of ground high-speed flow field observation experiments to hope to break through the restriction of the surface temperature on the technical development of the aircraft, and bring new opportunities for the development of a propulsion system of the aircraft.
When a low-temperature flow field observation experiment is performed, in order to keep the quality of the flow field from being interfered, the experiment is generally performed in a wind tunnel, and observation, shooting and measurement are performed on the flow field and an experimental object on the low-temperature surface through an optical glass observation window on the side surface. In this case, the low temperature surface is generally placed at the bottom of the wind tunnel and in contact with the side glass observation window, and the low temperature surface lowers the temperature of the glass surface through heat conduction. When the surface temperature of the glass observation window is lower than the dew point temperature of water vapor in the air, the condensation phenomenon can occur. Because the observation glass flow field side is high temperature or high speed air current and condensation phenomenon can not appear, and on the other side, the glass observation window is exposed in the static air, and the water vapor in the air forms condensation on the surface of the cold glass, thereby influencing the observation and shooting of the flow field.
In order to solve the condensation phenomenon on the surface of the glass, some researchers have proposed a condensation prevention structure for a refrigerating transparent window in a refrigerator (patent number: CN205316785U), wherein the condensation problem of the refrigerating transparent window in the refrigerator is effectively solved by installing a condensation prevention electric heating wire between a rear cover of a refrigerating door liner and the refrigerating door glass and filling a heat insulation material. The existing glass anti-condensation method needs to be additionally provided with an electric heating wire, and has high glass production cost and complex structure. Meanwhile, impact of high-speed incoming flow in the experiment has certain requirements on the glass performance and strength of the observation window, and the glass strength can be weakened by adopting methods such as additionally arranging an electric heating wire and the like, so that potential safety hazards are caused. Therefore, the existing glass condensation prevention method is not suitable for solving the problem of glass condensation in low-temperature flow field observation experiments in the field of aircraft propulsion.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the intelligent anti-condensation structure of the observation window glass for the low-temperature flow field observation experiment, which adopts the mode of additionally arranging a nitrogen source on the glass window and continuously and stably inputting nitrogen into an observation cavity to isolate air, thereby solving the condensation problem of the glass observation window.
In order to achieve the purpose, the invention provides an intelligent anti-condensation structure of observation window glass for a low-temperature flow field observation experiment, which comprises an experiment section, an observation window, a cover body, a camera and a nitrogen source, wherein the observation window is fixedly arranged on the experiment section;
the cover body is fixedly arranged on the experimental section and covers the observation window, an observation cavity is enclosed between the cover body and the outer wall of the experimental section, the camera is fixedly arranged on the cover body, and a lens of the camera is positioned in the observation cavity and faces the observation window;
the cover body is provided with an air inlet structure and an air outlet structure which can be communicated with the observation cavity and the external environment, and the air inlet structure is connected with the nitrogen source through a pipeline.
In one embodiment, the air outlet structure is a first through hole formed in the bottom of the cover body.
In one embodiment, the air inlet structure is a second through hole arranged on the side part of the cover body, and the second through hole is communicated with the nitrogen source through the pipeline.
In one embodiment, the air inlet structure comprises two second through holes symmetrically arranged at two sides of the cover body;
one end of the pipeline is connected with the nitrogen source, the other end of the pipeline penetrates through the cover body through the two second through holes, and part of the pipe body of the pipeline is positioned in the observation cavity;
and a plurality of third through holes are formed in the part of the pipe body of the pipeline, which is positioned in the observation cavity, at intervals along the length direction.
In one embodiment, a rubber sealing ring or a sealing strip is arranged on the wall of the second through hole and used for sealing and fixing the pipeline.
In one embodiment, a fourth through hole is formed in the cover body, the camera is fixed to the cover body through the fourth through hole, and a rubber sealing ring or a sealing strip is arranged at a connecting gap between the fourth through hole and the camera.
In one embodiment, a concave slot corresponding to the cover body is arranged on the observation window, and the cover body is detachably connected to the observation window through the concave slot.
In one embodiment, the intelligent anti-condensation structure further comprises:
the electromagnetic valve is arranged on the pipeline and used for controlling the on-off of the pipeline;
the temperature and humidity sensor is arranged in the observation cavity and used for acquiring the ambient temperature and the ambient humidity in the observation cavity;
the wall temperature sensor is arranged on the observation window and used for acquiring the wall temperature of the observation window;
the controller is arranged outside the cover body and is electrically connected with the electromagnetic valve, the temperature and humidity sensor and the wall temperature sensor so as to control the opening and closing of the electromagnetic valve based on the environment temperature, the environment humidity and the wall temperature.
In one embodiment, the control process of the controller specifically includes:
obtaining an ambient temperature T within the observation cavitycThe ambient humidity RH and the wall temperature T of the observation windows；
Based on the ambient temperature TcObtaining a corresponding first saturated steam pressure Ps(Tc) Based on the temperature of the wallTsObtaining a corresponding first saturated steam pressure Ps(Ts)；
Based on the first saturated steam pressure Ps(Tc) First saturated steam pressure Ps(Ts) Obtaining the critical humidity RH of the observation window condensationcThe method comprises the following steps: RH (relative humidity)c＝Ps(Ts)/Ps(Tc)；
Judging that RH is greater than or equal to alpha x RHcAnd if the result is positive, controlling the electromagnetic valve to be opened, otherwise controlling the electromagnetic valve to be closed, wherein alpha is a control coefficient.
In one embodiment, the device further comprises a cold light source arranged in the observation cavity, and the cold light source is electrically connected with the controller.
Compared with the prior art, the intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass has the following beneficial technical effects:
1. the glass is convenient and quick, is simple and convenient to manufacture, does not need to additionally process the observation window, and is suitable for various observation window glass conditions;
2. the experimental flow field does not need to be changed, and the method is suitable for various flow field experimental working conditions;
3. the light entering of the camera is not influenced, and better shooting conditions can be provided in experiments needing to shield sunshine rays.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a cross sectional view of an intelligent anti-condensation structure of low-temperature flow field observation experiment observation window glass in a first embodiment of a second through hole;
FIG. 2 is a structural diagram of an intelligent anti-condensation structure of low-temperature flow field observation experiment observation window glass in the embodiment of the invention, wherein a second through hole adopts a first implementation mode;
FIG. 3 is a cross sectional view of an intelligent anti-condensation structure of a low-temperature flow field observation experiment observation window glass in a second through hole in the embodiment of the invention in a second implementation manner;
FIG. 4 is a structural diagram of an intelligent anti-condensation structure of low-temperature flow field observation experiment observation window glass in the embodiment of the invention, wherein a second through hole adopts a second implementation mode;
FIG. 5 is a cross sectional view of the intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass with a control assembly in the embodiment of the invention;
FIG. 6 is a structural diagram of an intelligent anti-condensation structure of a low-temperature flow field observation experiment observation window glass with a control assembly in the embodiment of the invention;
FIG. 7 is a graph of saturated vapor pressure versus temperature for air in an embodiment of the present invention;
fig. 8 is a view showing a structure of the connection between the cover and the observation window in the embodiment of the present invention.
Reference numerals: the device comprises an experimental section 10, an observation window 101, a low-temperature cold surface 102, a wall temperature sensor 103, a clamping groove 104, a cover body 20, an observation cavity 201, a first through hole 202, a second through hole 203, an exhaust pipe 204, a fourth through hole 205, a temperature and humidity sensor 206, a cold light source 207, a cable hole 208, a camera 30, a nitrogen source 40, a pipeline 50, a third through hole 501, an electromagnetic valve 502 and a controller 60.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 to 4 show an intelligent anti-condensation structure of a low-temperature flow field observation experiment observation window glass disclosed in this embodiment, which mainly includes an experiment section 10, an observation window 101, a cover 20, a camera 30, and a nitrogen source 40. The experiment section 10 has an experiment flow field therein, the direction of the arrow in fig. 1 is the flow field airflow direction, the left end of the experiment section 10 is an airflow inlet, the right end is an airflow outlet, and the bottom of the experiment section 10 is a low-temperature cold surface 102.
The cover body 20 is fixedly arranged on the experimental section 10 and covers the observation window 101, an observation cavity 201 is enclosed between the cover body 20 and the outer wall of the experimental section 10, the camera 30 is fixedly arranged on the cover body 20, and the lens of the camera 30 is positioned in the observation cavity 201 and faces the observation window 101. The cover body 20 is provided with an air inlet structure and an air outlet structure which can communicate the observation cavity 201 with the external environment, and the air inlet structure is connected with the nitrogen source 40 through a pipeline 50. The adoption installs nitrogen gas source 40 additional on the glass window to last steady mode of observing chamber 201 input nitrogen gas with isolated air, and then solve glass observation window condensation difficult problem, simple structure moreover implements effectively, is applicable to the observation condition of multiple flow field, and convenient operation easily realizes.
In this embodiment, the cover 20 is a non-closed open cuboid structure having five outer surfaces, and the material of the cover 20 can be selected according to experimental requirements. For the lens of the camera 30 that needs to use the sunshine as the incoming light, the transparent material such as transparent glass or transparent resin can be used as the surface material of the cover 20, and the incoming light of the lens of the camera 30 is not affected. For the camera 30 lens that needs to shield sunshine rays, for example, instantaneous laser light is used as the light entering, and an opaque material, such as black plastic, can be used as the surface material of the cover body 20.
In this embodiment, the air outlet structure is a first through hole 202 disposed at the bottom of the cover 20, the air inlet structure is a second through hole 203 disposed at the side of the cover 20 and above, and the first through hole 202 is connected to an exhaust pipe 204. The second through hole 203 is provided above the observation chamber 201 because the nitrogen gas has a lower density than that of the air, and the input nitrogen gas concentrates on the observation chamber 201 and gradually fills the observation chamber 201, and the air is discharged from the first through hole 202 and the exhaust pipe 204 below.
In this embodiment, the second through hole 203 has two embodiments:
referring to fig. 1-2, there is shown a first embodiment of the second through hole 203, in which the number of the second through hole 203 is one, and the second through hole 203 is communicated with the nitrogen gas source 40 through the pipeline 50, the pipe diameter of the pipeline 50 is 4mm to 6mm, and finally the nitrogen gas in the nitrogen gas source 40 is continuously and stably fed into the observation cavity 201 through the pipeline 50 and the second through hole 203.
Referring to fig. 3-4, a second embodiment of the second through hole 203 is shown, in which the number of the second through holes 203 is two, and the two second through holes 203 are symmetrically arranged on two sides of the cover 20; one end of the pipeline 50 is connected with the nitrogen source 40, the other end of the pipeline passes through the cover body 20 through the two second through holes 203, and part of the pipe body of the pipeline 50 is positioned in the observation cavity 201; a part of the pipe body of the pipeline 50 located in the observation cavity 201 is provided with a plurality of third through holes 501 with the aperture of 1 mm-2 mm at equal intervals along the length direction, and finally, nitrogen in the nitrogen source 40 is continuously and stably input into the observation cavity 201 through the pipeline 50 and the third through holes 501.
In this embodiment, a rubber sealing ring or a sealing strip is disposed on the wall of the second through hole 203 for sealing and fixing the pipeline 50.
In this embodiment, the cover body 20 is provided with a fourth through hole 205, the camera 30 is fixed on the cover body 20 through the fourth through hole 205, and a rubber seal ring or a sealing strip is arranged at a connection gap between the fourth through hole 205 and the camera 30.
Referring to fig. 5-6, as a preferred embodiment, the anti-condensation structure further includes a control component for controlling the on/off of the pipeline 50, so as to reduce the amount of nitrogen and save energy while ensuring that the glass observation window 101 is not condensed. Specifically, the control components include a solenoid valve 502, a temperature and humidity sensor 206, a wall temperature sensor 103, and a controller 60. The electromagnetic valve 502 is arranged on a part of the pipe body of the pipeline 50 between the nitrogen source 40 and the cover body 20 and is used for controlling the on-off of the pipeline 50; the temperature and humidity sensor 206 is disposed in the observation cavity 201 and is used for acquiring an ambient temperature T in the observation cavity 201cAnd ambient humidity RH; a wall temperature sensor 103 is provided on the observation window 101 for acquiring a wall temperature T of the observation window 101s(ii) a The controller 60 is disposed outside the cover 20, and is electrically connected to the electromagnetic valve 502, the temperature and humidity sensor 206, and the wall temperature sensor 103, so as to control the opening and closing of the electromagnetic valve 502 based on the ambient temperature, the ambient humidity, and the wall temperature.
Further specifically, the control process of the controller 60 is specifically:
referring to fig. 7, a saturated vapor pressure (P) -temperature (T) curve of air, which has been obtained through a number of experimental studies, is shown, and thus, no further description is given in this embodiment. T iscTo observe the ambient temperature, P, within the chamber 201s(Tc) Is TcCorresponding first saturated steam pressure, TsTo observe the wall temperature, P, of the window 101s(Ts) Is TsCorresponding second saturated steam pressure, PcFor the ambient vapor partial pressure, the ambient humidity RH in the observation cavity 201 is:
RH＝Pc/Ps(Tc)
when P is presentc≤Ps(Ts) Since the condensation does not occur near the glass surface of the observation window 101, the critical humidity RH of the condensation of the observation window 101 is not loweredcComprises the following steps:
RHc＝Ps(Ts)/Ps(Tc)
wherein T iss、TcCan be obtained by the wall temperature sensor 103 and the temperature and humidity sensor 206 respectively. In addition, in the present embodiment, the saturated vapor pressure (P) -temperature (T) curve data may be previously introduced into the controller 60, and then Ps(Ts)、Ps(Tc) Can be obtained by the built-in program of the controller 60, and the critical humidity RH of the condensation of the observation window 101 can be calculatedcAnd the ambient humidity RH currently observed in the chamber 201 can be obtained by the temperature and humidity sensor 206, and at this time, the controller 60 can compare RH with RHcAnd (6) judging. In order to ensure that the observation window 101 is free from condensation, the ambient humidity RH in the observation cavity 201 needs to be controlled more strictly, and the control coefficient α is set to 0.8. When RH is more than or equal to alpha multiplied by RHcAt this time, the controller 60 opens the solenoid valve 502, and introduces nitrogen gas to decrease the humidity in the observation chamber 201 until the ambient humidity RH in the observation chamber 201 is reached<α×RHcAt this time, the electromagnetic valve 502 is closed, so that the humidity in the observation cavity 201 is intelligently controlled, and the observation window 101 is ensured not to be condensed.
In a preferred embodiment, a cold light source 207 is further disposed in the observation cavity 201, the cold light source 207 is mounted on an inner wall of the housing 20 where the camera 30 is mounted, and the cold light source 207 is electrically connected to the controller 60, that is, the controller 60 controls the on/off of the cold light source 207 for providing a sufficient amount of light to the camera 30 when necessary.
It should be noted that, although the second embodiment is selected as the second through hole 203 in fig. 5 to 6, the first embodiment may be selected in the specific implementation process.
It should be noted that, referring to fig. 8, a plurality of cable holes 208 are provided on the cover 20, and rubber sealing rings or sealing strips are provided on the cable holes 208 for sealing and fixing the cables connected between the controller 60 and the wall temperature sensor 103, the temperature and humidity sensor 206, and the cold light source 207.
In this embodiment, the open surface of the cover 20 is connected to the glass of the observation window 101, so that the shooting of the lens of the camera 30 on the experimental object in the experimental section 10 is not affected. In a preferred embodiment, the observation window 101 is provided with a concave slot 104 corresponding to the cover 20, and the cover 20 is connected to the observation window 101 through the concave slot 104 fixed on the observation window 101, so as to facilitate quick detachment and installation of the cover 20. The cover 20 and the concave card slot 104 are directly clamped and separated by a snap structure or a pneumatic clamp, and the implementation process is a conventional technical means in the field, and therefore the detailed description thereof is omitted in this embodiment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An intelligent anti-condensation structure of observation window glass for low-temperature flow field observation experiment is characterized by comprising an experiment section, an observation window, a cover body, a camera and a nitrogen source, wherein the observation window is fixedly arranged on the experiment section;
the cover body is fixedly arranged on the experimental section and covers the observation window, an observation cavity is enclosed between the cover body and the outer wall of the experimental section, the camera is fixedly arranged on the cover body, and a lens of the camera is positioned in the observation cavity and faces the observation window;
the cover body is provided with an air inlet structure and an air outlet structure which can be communicated with the observation cavity and the external environment, and the air inlet structure is connected with the nitrogen source through a pipeline.
2. The intelligent anti-condensation structure of low-temperature flow field observation experiment observation window glass according to claim 1, wherein the air outlet structure is a first through hole formed in the bottom of the cover body.
3. The intelligent anti-condensation structure of low-temperature flow field observation experiment observation window glass according to claim 2, wherein the air inlet structure is a second through hole formed in the side part of the cover body, and the second through hole is communicated with the nitrogen source through the pipeline.
4. The intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass according to claim 2, wherein the air inlet structure comprises two second through holes symmetrically arranged at two sides of the cover body;
one end of the pipeline is connected with the nitrogen source, the other end of the pipeline penetrates through the cover body through the two second through holes, and part of the pipe body of the pipeline is positioned in the observation cavity;
and a plurality of third through holes are formed in the part of the pipe body of the pipeline, which is positioned in the observation cavity, at intervals along the length direction.
5. The intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass according to claim 3 or 4, wherein a rubber sealing ring or a sealing strip is arranged on the wall of the second through hole and used for sealing and fixing the pipeline.
6. The intelligent anti-condensation structure of the observation window glass for the low-temperature flow field observation experiment according to any one of claims 1 to 4, wherein a fourth through hole is formed in the cover body, the camera is fixed on the cover body through the fourth through hole, and a rubber sealing ring or a sealing strip is arranged at a connecting gap between the fourth through hole and the camera.
7. The intelligent anti-condensation structure for glass of an observation window in a low-temperature flow field observation experiment according to any one of claims 1 to 4, wherein a concave slot corresponding to the cover body is arranged on the observation window, and the cover body is detachably connected to the observation window through the concave slot.
8. The intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass according to any one of claims 1 to 4, further comprising:
the electromagnetic valve is arranged on the pipeline and used for controlling the on-off of the pipeline;
the temperature and humidity sensor is arranged in the observation cavity and used for acquiring the ambient temperature and the ambient humidity in the observation cavity;
the wall temperature sensor is arranged on the observation window and used for acquiring the wall temperature of the observation window;
the controller is arranged outside the cover body and is electrically connected with the electromagnetic valve, the temperature and humidity sensor and the wall temperature sensor so as to control the opening and closing of the electromagnetic valve based on the environment temperature, the environment humidity and the wall temperature.
9. The intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass according to claim 8, wherein the control process of the controller specifically comprises:
obtaining an ambient temperature T within the observation cavitycThe ambient humidity RH and the wall temperature T of the observation windows；
Based on the ambient temperature TcObtaining a corresponding first saturated steam pressure Ps(Tc) Based on the temperature of the wall surfaceDegree TsObtaining a corresponding first saturated steam pressure Ps(Ts)；
Based on the first saturated steam pressure Ps(Tc) First saturated steam pressure Ps(Ts) Obtaining the critical humidity RH of the observation window condensationcThe method comprises the following steps: RH (relative humidity)c＝Ps(Ts)/Ps(Tc)；
Judging that RH is greater than or equal to alpha x RHcAnd if the result is positive, controlling the electromagnetic valve to be opened, otherwise controlling the electromagnetic valve to be closed, wherein alpha is a control coefficient.
10. The intelligent anti-condensation structure of the low-temperature flow field observation experiment observation window glass according to claim 9, further comprising a cold light source arranged in the observation cavity, wherein the cold light source is electrically connected with the controller.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003284210A (en) * | 2002-03-20 | 2003-10-03 | Mitsubishi Electric Corp | Apparatus and method for preventing condensation at distribution panel inspection window |
| CN102033307A (en) * | 2010-10-15 | 2011-04-27 | 上海理工大学 | Dew prevention device for low-temperature microscope stage |
| CN102621042A (en) * | 2012-04-27 | 2012-08-01 | 南京大学 | Device for measuring droplet contact angle and rolling angle under temperature control, humidity control and pressure control condition |
| CN205540433U (en) * | 2016-02-29 | 2016-08-31 | 广州视睿电子科技有限公司 | Touch all-in-one machine |
| CN107139681A (en) * | 2017-05-08 | 2017-09-08 | 吉林大学 | A kind of parking windscreen active antifrost and the control device frozen and its control method |
| CN109976068A (en) * | 2019-03-29 | 2019-07-05 | 北京卫星制造厂有限公司 | A kind of Portable type high-low temperature camera shooting protective device |
-
2021
- 2021-09-13 CN CN202111067735.2A patent/CN113778145A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003284210A (en) * | 2002-03-20 | 2003-10-03 | Mitsubishi Electric Corp | Apparatus and method for preventing condensation at distribution panel inspection window |
| CN102033307A (en) * | 2010-10-15 | 2011-04-27 | 上海理工大学 | Dew prevention device for low-temperature microscope stage |
| CN102621042A (en) * | 2012-04-27 | 2012-08-01 | 南京大学 | Device for measuring droplet contact angle and rolling angle under temperature control, humidity control and pressure control condition |
| CN205540433U (en) * | 2016-02-29 | 2016-08-31 | 广州视睿电子科技有限公司 | Touch all-in-one machine |
| CN107139681A (en) * | 2017-05-08 | 2017-09-08 | 吉林大学 | A kind of parking windscreen active antifrost and the control device frozen and its control method |
| CN109976068A (en) * | 2019-03-29 | 2019-07-05 | 北京卫星制造厂有限公司 | A kind of Portable type high-low temperature camera shooting protective device |
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Application publication date: 20211210 |
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