CN114152402B - Wind tunnel test water content measuring device - Google Patents
Wind tunnel test water content measuring device Download PDFInfo
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- CN114152402B CN114152402B CN202210116040.7A CN202210116040A CN114152402B CN 114152402 B CN114152402 B CN 114152402B CN 202210116040 A CN202210116040 A CN 202210116040A CN 114152402 B CN114152402 B CN 114152402B
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- probe
- electric heating
- rectifying plate
- wind tunnel
- water content
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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
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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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
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The invention belongs to the field of wind tunnel tests, and particularly relates to a water content measuring device for a wind tunnel test. The probe comprises a probe and a support upright post, and further comprises a rectifying plate and an electric heating film, wherein the rectifying plate is arranged between the probe and the support upright post, and extends towards the direction far away from the probe and the support upright post; the electric heating film is coated on the rectifying plate. The invention solves the problem that the influence of icing of the supporting upright column on the flow field around the front edge of the probe improves the measurement error of the probe.
Description
Technical Field
The invention belongs to the field of wind tunnel tests, and particularly relates to a water content measuring device for a wind tunnel test.
Background
When an aircraft is flying at a temperature below freezing, if a cloud containing supercooled water droplets is encountered, the water droplets in the cloud impinge on the aircraft surface, resulting in icing. The icing of the airplane is a phenomenon widely existing in the flight practice and is one of the main hidden dangers of flight safety accidents. Icing can change the flow-around flow field of the airplane, so that the load distribution of components is changed, the aerodynamic performance is damaged, the maneuverability and stability of the airplane are affected, the flight safety is damaged, the safe flight range is reduced by light persons, and serious accidents of machine damage and human death can be caused by heavy persons.
An icing wind tunnel is necessary equipment for researching the problems of icing and deicing of the airplane, and an icing wind tunnel test is one of important methods for verifying whether an airplane deicing and anti-icing system is effective. Compared with a conventional wind tunnel, the icing wind tunnel comprises two special systems, namely a refrigerating system which can reduce the temperature to the icing temperature and a spraying system which can generate micron-sized water drops. The icing wind tunnel needs multiple systems to work cooperatively, and a lot of parameters are involved, so that accurate measurement of the cloud and mist field parameters has important significance for improving the test capability of the icing wind tunnel.
The Liquid Water Content (LWC) is the mass of Liquid Water contained in a unit volume of air, is an important icing cloud parameter that affects the icing shape and the icing type, and directly affects the severity of icing. The method for measuring the liquid water content mainly comprises the following steps: probe measurement, hot wire measurement, particle diameter measurement/counting measurement, ultrasonic measurement, and ice growth measurement. The liquid water content in the icing wind tunnel is measured by a probe, and a support upright post is required to be arranged at the lower part of the probe to support and fix the probe in use; however, the probe is small in size, the supporting upright column has a certain volume, and if the supporting upright column is frozen, the peripheral flow field of the probe is affected, so that the liquid water content measured by the probe is small.
Disclosure of Invention
The invention aims to provide a wind tunnel water content measuring device to solve the problems that the icing of a support upright column influences the smoothness of the periphery of the front edge of a probe and the measurement error of the probe is reduced.
The invention is realized by the following technical scheme:
the invention provides a wind tunnel test water content measuring device, which comprises a probe, a supporting upright post, a rectifying plate and an electric heating film, wherein the rectifying plate is arranged between the probe and the supporting upright post and extends towards the direction far away from the probe and the supporting upright post; the electric heating film is coated on the rectifying plate.
In an icing wind tunnel test, the support upright column can be iced, and the iced support upright column can influence the measurement value of the probe; in the process of the invention creation, the support upright post is prevented from being frozen by a mode of electrically heating the film on the support upright post, but the support upright post is too large and has a wide windward side, so that the heating power is not high, the temperature rise in unit area is very low, and the support upright post cannot be prevented from being frozen; if the effect of preventing the support upright from being frozen is achieved, the support upright needs to be completely wrapped by an electric heating film, the power required by each square centimeter of the support upright is more than 0.5W, the power required by the whole support upright is nearly 5000W, if the power standard is met, the power supply line is very thick, the space of the support upright is limited and cannot accommodate the power supply line, a larger upright is required to accommodate the power supply line, and the power required by the larger upright is also larger; so that the technical problem has not been solved.
Through creative work of the inventor, the inventor arranges a rectifying plate between the supporting upright post and the probe, thereby avoiding the influence of the supporting upright post on the flow field around the probe; the rectifying plate can influence the flow field, so the rectifying plate extends towards the direction far away from the probe and the supporting upright column (namely, the end part of the rectifying plate positioned on the windward side has a certain distance with the probe, and the flow field disturbed by the front edge of the end part of the rectifying plate has a recovery space), thereby eliminating the influence of the rectifying plate on the flow field; meanwhile, the end part of the front edge of the windward end of the rectifying plate can be frozen and can influence the flow field, so that the rectifying plate is coated with an electric heating film, the rectifying plate is prevented from being frozen by heating the electric heating film, and the water content measured by the probe is higher in accuracy.
Further, the coating mode of the electric heating film is as follows: the rectification plate is coated from the end close to the probe to the end far away from the probe, and then the rectification plate is coated from the end far away from the probe to the end close to the probe. The extension end of cowling panel needs the windward setting in the use, through mode cladding electrical heating membrane can avoid the air current to cause the influence to electrical heating membrane, prevents that electrical heating membrane from blowing to tear the fracture.
Further, the electric heating wires of the electric heating film are arranged at the extending end of the rectifying plate. Because the windward end front edge of the fairing is easy to freeze, the heating wires are arranged at the extension end of the fairing, the icing of the front edge of the fairing end can be better prevented, the loss of electric energy can be reduced, and the cost is reduced.
Further, the electric heating film on the upper surface of the extending end of the rectifying plate and the electric heating wire on the electric heating film on the lower surface are symmetrically arranged. The heat-insulating plate has a better heating effect on the heat-insulating plate.
Further, still include the soaking board of copper, the soaking board of copper sets up on the electrical heating membrane. A certain gap is formed between the electric heating wires on the electric heating film, so that the problem of uneven temperature can exist; the temperature can be made uniform by disposing the copper vapor chamber on the electric heating film.
Furthermore, the copper soaking plate is coated on the electric heating film at the end part of the extending end of the rectifying plate. Because the cowling panel extends end tip windward when using, the cowling panel extends end tip leading edge and is changeed icing, and the copper soaking plate setting is extended end tip at the cowling panel, makes the cowling panel extend end tip more even that the temperature is got, and anti-icing effect is better.
Further, the copper soaking plate is coated in the following manner: the upper surface of the end part of the extending end of the rectifying plate is covered to the lower surface of the end part of the extending end of the rectifying plate. The same way as the coating way of the electric heating film, the advantage of preventing the copper soaking plate from being blown and torn by wind is also provided.
Further, still include control system, control system includes temperature controller and thermocouple, the thermocouple is used for detecting the temperature on the cowling panel, temperature controller control electrical heating membrane. The control system can realize automatic control of temperature, and is more intelligent and convenient.
Further, the distance from the front edge of the extending end of the rectifying plate to the probe is 2-4 times of the length of the probe. The rectifying plate has the best rectifying effect.
Furthermore, the front edge of the end part of the extending end of the rectifying plate is provided with a downward chamfer. If the front edge of the end part of the rectifying plate is a vertical surface, eddy currents can be formed on the upper surface and the lower surface of the rectifying plate, the inclined plane is arranged to have a rectifying effect, the influence of the rectifying plate on a flow field is reduced, and the result measured by the probe is more accurate.
By adopting the technical scheme, the invention has the following advantages:
the invention solves the problem of influence of icing of the supporting upright column on the flow field around the probe by arranging the rectifying plate and the electric heating film, and ensures that the water content measured by the probe is more accurate.
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 description of the embodiments of the present invention or 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 first structural schematic diagram of a wind tunnel test water content measuring device according to the present invention;
FIG. 2 is a partial schematic view of FIG. 1;
FIG. 3 is a schematic structural diagram II of the wind tunnel test water content measuring device of the present invention;
FIG. 4 is a partial schematic view of FIG. 3;
FIG. 5 is a schematic view of a structure of an electrically heated film;
FIG. 6 is a third schematic structural diagram of the wind tunnel test water content measuring device of the present invention;
FIG. 7 is a partial schematic view of FIG. 6;
in the drawings: 10. the device comprises a probe, 20, a support column, 30, a rectifying plate, 31, a chamfer plane, 40, an electric heating film, 41, an electric heating wire, 50 and a copper soaking plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it should be noted that when an element is referred to as being "fixed" or "disposed" to another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined 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.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 6, the present embodiment provides a water content measuring device for a wind tunnel test, which includes a probe 10 and a support pillar 20, and further includes a rectifying plate 30 and an electric heating film 40, where the rectifying plate 30 is disposed between the probe 10 and the support pillar 20, and the rectifying plate 30 extends in a direction away from the probe 10 and the support pillar 20; the electric heating film 40 is coated on the rectifying plate 30.
In the icing wind tunnel test, the support column 20 can be iced, and the iced support column 20 can influence the measurement value of the probe 10; in the process of the inventor for making the invention, the support column 20 is prevented from being frozen by applying the electric heating film 40 on the support column 20, but because the support column 20 is too large and has a wide windward side, the heating power is not high, the temperature rise per unit area is very low, and the support column 20 cannot be prevented from being frozen; if the effect of preventing the support column 20 from being frozen is to be achieved, the support column 20 needs to be completely wrapped by the electric heating film 40, the power required by the support column 20 per square centimeter is more than 0.5W, the power required by the whole support column 20 is nearly 5000W, if the power standard is to be met, the power supply line is very thick, the space of the support column 20 is limited and cannot accommodate the power supply line, a larger column is required to accommodate the power supply line, and the power required by the larger column is also larger; so that the technical problem has not been solved.
Through the creative work of the inventor, the inventor arranges the rectifying plate 30 between the support upright post 20 and the probe 10, thereby avoiding the influence of the support upright post 20 on the flow field around the probe 10; the rectifying plate 30 itself will also affect the flow field, so the rectifying plate 30 is extended in the direction far away from the probe 10 and the supporting column 20 (i.e. the end of the rectifying plate 30 on the windward side has a certain distance from the probe 10, so that the flow field disturbed by the front edge of the end of the rectifying plate 30 has a recovery space), to eliminate the influence of the rectifying plate 30 on the flow field; meanwhile, the end part of the front edge of the windward end of the rectifying plate 30 can be frozen and can also influence the flow field, so that the rectifying plate 30 is coated with the electric heating film 40, the rectifying plate 30 is prevented from being frozen by heating through the electric heating film 40, and the water content measured by the probe 10 is higher in accuracy.
In some embodiments, the size of the fairing 30 is 400 x 200 x 11. It should be noted that the selection of the size of the rectifying plate 30 is not limited to the method provided in the present embodiment.
Further, the coating manner of the electric heating film 40 is as follows: the current plate 30 is covered from the current plate 30 near one end of the probe 10 to the current plate 30 far from one end of the probe 10, and then the current plate 30 is covered from one end far from the probe 10 to one end near the probe 10. The extension end of cowling panel 30 needs the windward setting in the use, through mode cladding electric heating membrane 40 can avoid the air current to cause the influence to electric heating membrane 40, prevents that electric heating membrane 40 from being blown by the wind and tearing open.
Of course, the electric heating film 40 may be entirely coated on the rectifying plate 30, and may specifically include the coating manner described above, but is not limited to the coating manner; the plurality of electric heating films 40 may be attached to the upper and lower surfaces of the rectifying plate 30. In any coating method, it is required to ensure that the electric heating films 40 and the electric heating wires are provided on the upper and lower surfaces of the extending end of the rectifying plate 30, and the electric heating films 40 may be coated on other positions of the rectifying plate 30 or the electric heating films 40 may not be provided.
Further, as shown in fig. 2, the rectifying plate 30 is coated with one sheet of the electric heating film 40, starting from the rectifying plate 30 near one end of the probe 10, to the rectifying plate 30 far from one end of the probe 10, and then to the rectifying plate 30 near one end of the probe 10 from one end far from the probe 10. Because the rectifying plate 30 is generally placed in a wind tunnel environment with the wind speed of more than 80m/s, and the electric heating film 40 is blown and torn by wind, the electric heating film 40 is designed to be a front edge coating integrated body, and the power supply lines and the pasting gaps are all placed at the rear part or the lower part of the rectifying end plate to prevent the airflow from damaging the rectifying end plate.
Further, the heating wire 41 of the electric heating film 40 is arranged at the extended end of the rectifying plate 30. Because the front edge of the windward end of the rectifying plate 30 is easy to freeze, the heating wires 41 are arranged at the extending end of the rectifying plate 30, so that the front edge of the end of the rectifying plate 30 can be better prevented from freezing, the loss of electric energy can be reduced, and the cost is reduced.
In some embodiments the electrically heated film 40 may be selected from: the rated voltage is 24v, the resistance value is about 1.5 ohm, the body material of the electric heating film 40 is polyimide, the film thickness is about 0.2mm (containing back 3M high temperature resistant double faced adhesive tape), and the material of the electric heating wire 41 is nickel chromium platinum alloy; the electric heating film 40 is attached to the rectifying plate 30 by a high temperature resistant double-sided tape. It should be noted that the selection of the electrical heating film 40 is not limited to the manner provided in the present embodiment.
Further, as shown in fig. 5, the electric heating wires 41 of the electric heating film 40 on the upper surface and the electric heating film 40 on the lower surface of the extended end of the rectifying plate 30 are symmetrically disposed. Has better heating effect on the convection plate 30.
As shown in fig. 6 and 7, the electric heating film further includes a soaking plate 50 made of copper, and the soaking plate 50 made of copper is provided on the electric heating film 40. A certain gap is formed between the electric heating wires on the electric heating film 40, so that the problem of uneven temperature can exist; the temperature can be made uniform by providing the soaking plate 50 made of copper on the electric heating film 40.
Further, the soaking plate 50 made of copper is coated on the electric heating film 40 at the end of the extending end of the rectifying plate 30. Because the end part of the extending end of the rectifying plate 30 faces the wind when in use, the front edge of the end part of the extending end of the rectifying plate 30 is easier to freeze, and the copper soaking plate 50 is arranged at the end part of the extending end of the rectifying plate 30, so that the temperature of the end part of the extending end of the rectifying plate 30 is more uniform, and the anti-icing effect is better.
Further, the copper soaking plate 50 is coated in the following manner: the upper surface of the extending end of the rectifying plate 30 is covered with the lower surface of the extending end of the rectifying plate 30. Similarly to the coating method of the electric heating film 40, the advantage of preventing the copper soaking plate 50 from being torn by wind is also provided.
The copper soaking plate 50 in some embodiments may be selected from: the material is red copper, the size is 200mm x 210mm, and the thickness is 1 mm; the copper soaking plate 50 is adhered to the electric heating film 40 through double-sided adhesive, and the specific adhesion method comprises the following steps: the double-sided adhesive tape is adhered to gaps between the heating wires 41 of the electric heating film 40, heat-conducting silicone grease (Arctic mx-4 heat-conducting silicone grease is selected in the embodiment) with the heat conductivity coefficient not less than 5W/m.k is coated on the heating wires 41, then the copper soaking plate 50 and the electric heating film 40 are tightly attached and slightly heated, the heat-conducting silicone grease is heated to be in a flowing state and then uniformly distributed below the copper soaking plate 50, the heat-conducting performance between the copper soaking plate 50 and the electric heating film 40 is improved, and the heat can be timely conducted to the copper soaking plate 50. The type of the soaking plate 50 made of copper is not limited to the embodiment of the present embodiment.
Further, the device also comprises a control system, wherein the control system comprises a temperature controller and a thermocouple, the thermocouple is used for detecting the temperature on the rectifying plate 30, and the temperature controller controls the electric heating film 40. The control system can realize automatic control of temperature, and is more intelligent and convenient.
The thermocouple and temperature controller may be selected in some embodiments: the K-type thermocouple and the switch type temperature controller are used, and the thermocouple and the temperature controller are all existing products and can be directly purchased and used. It should be noted that the type of the thermocouple and the temperature controller is not limited to the manner provided in the present embodiment.
Further, the distance from the front edge of the extending end of the rectifying plate 30 to the probe 10 is 2 to 4 times of the length of the probe 10. The rectifying plate 30 has the best rectifying effect at this time.
Further, the front edge of the extending end of the current plate 30 is provided with a downward chamfer 31. If the front edge of the end part of the rectifying plate 30 is a vertical surface, the upper surface and the lower surface of the rectifying plate 30 can form a vortex, and the inclined cutting surface 31 is arranged to have the rectifying effect, so that the influence of the rectifying plate 30 on the flow field is reduced, and the result measured by the probe 10 is more accurate.
Further, the thermocouple is disposed at the center of the chamfer 31, so that the temperature measured by the thermocouple is more accurate.
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 principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a wind tunnel test water content measuring device, includes probe (10) and support post (20), its characterized in that: the wind power generation device is characterized by further comprising a rectifying plate (30) and an electric heating film (40), wherein the rectifying plate (30) is arranged between the probe (10) and the supporting upright post (20), the rectifying plate (30) extends in the direction away from the probe (10) and the supporting upright post (20), and the end part of the rectifying plate (30) on the windward side is away from the probe (10); electric heating membrane (40) cladding is on cowling panel (30), the heating wire of electric heating membrane (40) is arranged cowling panel (30) extend the end, cowling panel (30) extend end tip front edge and are provided with decurrent scarf (31).
2. The wind tunnel test water content measuring device according to claim 1, characterized in that: the coating mode of the electric heating film (40) is as follows: the rectification plate (30) close to one end of the probe (10) is coated to the rectification plate (30) far away from one end of the probe (10), and then the rectification plate (30) far away from one end of the probe (10) is coated to one end close to the probe (10).
3. The wind tunnel test water content measuring device according to claim 2, wherein: the heating wires (41) of the electric heating film (40) are arranged at the extending end of the rectifying plate (30).
4. A wind tunnel test water content measuring device according to claim 2 or 3, characterized in that: the electric heating film (40) on the upper surface of the extending end of the rectifying plate (30) and the electric heating wires (41) on the electric heating film (40) on the lower surface are symmetrically arranged.
5. The wind tunnel test water content measuring device according to claim 1, characterized in that: the heating device further comprises a copper soaking plate (50), wherein the copper soaking plate (50) is arranged on the electric heating film (40).
6. The wind tunnel test water content measuring device according to claim 5, wherein: the copper soaking plate (50) is coated on the electric heating film (40) at the end part of the extending end of the rectifying plate (30).
7. The wind tunnel test water content measuring device according to claim 6, wherein: the copper soaking plate (50) is coated in the following way: the upper surface of the extending end of the rectifying plate (30) is covered with the lower surface of the extending end of the rectifying plate (30).
8. The wind tunnel test water content measuring device according to claim 1 or 5, wherein: still include control system, control system includes temperature controller and thermocouple, the thermocouple is used for detecting the temperature on cowling panel (30), temperature controller control electrical heating membrane (40).
9. The wind tunnel test water content measuring device according to claim 1, characterized in that: the distance from the front edge of the extending end part of the rectifying plate (30) to the probe (10) is 2-4 times of the length of the probe (10).
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| CN202210116040.7A CN114152402B (en) | 2022-02-07 | 2022-02-07 | Wind tunnel test water content measuring device |
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| CN202210116040.7A CN114152402B (en) | 2022-02-07 | 2022-02-07 | Wind tunnel test water content measuring device |
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| CN114152402B true CN114152402B (en) | 2022-05-31 |
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