CN209802626U - Device for measuring surface pressure of model in wind tunnel - Google Patents
Device for measuring surface pressure of model in wind tunnel Download PDFInfo
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- CN209802626U CN209802626U CN201920960450.3U CN201920960450U CN209802626U CN 209802626 U CN209802626 U CN 209802626U CN 201920960450 U CN201920960450 U CN 201920960450U CN 209802626 U CN209802626 U CN 209802626U
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- 239000012153 distilled water Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 17
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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Landscapes
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The utility model provides a device for measuring the surface pressure of a model in a wind tunnel, which comprises a connecting pipe and a pressure measuring module, wherein the connecting pipe is internally provided with liquid, and the pressure measuring module is used for measuring the bottom pressure of the liquid; one end of the connecting pipe is used for being connected with a pressure measuring hole formed in the surface of the model, the other end of the connecting pipe is connected with the pressure measuring module, and the connecting pipe is communicated with the pressure measuring hole. The device for measuring the surface pressure of the model in the wind tunnel has the following advantages: the method can be applied to high-speed wind tunnels to improve the measurement frequency response; the pressure of the local small range of the surface of the model can be measured, and the measurement resolution is improved.
Description
Technical Field
The utility model relates to a wind-tunnel technical field especially relates to a measuring device of surface pressure of model in wind-tunnel.
Background
The pressure of the surface of the model is measured by using a wind tunnel test, and the currently common methods comprise a pressure strain gauge measurement method and a pressure sensitive paint measurement method.
In the pressure strain gauge measurement method, a pressure strain gauge is directly attached to the surface of a model, and the gas pressure is measured by using the change in the resistance value of the strain gauge due to the change in the gas pressure.
The Pressure Sensitive Paint (PSP) measuring method is to apply a special Paint with color change caused by Pressure change to the surface of a model, and can obtain large-area Pressure distribution on the surface of the measured model on the premise of approaching the traditional Pressure measuring precision.
However, the prior art has the following defects: in the pressure strain gauge measuring method, the surface areas of the used pressure strain gauges are large, and the measured pressure value is the average value of the areas covered by the pressure strain gauges, so that the pressure value in a local small range cannot be obtained; the PSP measurement method can be difficult to apply under hypersonic flow conditions due to the temperature effect of the coating.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a measuring device of the surface pressure of the model in the wind-tunnel for solve the defect that pressure foil gage measurement method and pressure sensitive lacquer measurement method exist among the prior art.
In order to solve the above problem, the utility model provides a: a device for measuring the surface pressure of a model in a wind tunnel comprises a connecting pipe and a pressure measuring module, wherein liquid is arranged in the connecting pipe;
One end of the connecting pipe is used for being connected with a pressure measuring hole formed in the surface of the model, the other end of the connecting pipe is connected with the pressure measuring module, and the connecting pipe is communicated with the pressure measuring hole.
As a further improvement of the above technical solution, the pressure measuring module includes a pressure scanning valve, and a pressure sensor is disposed on the pressure scanning valve;
the bottom of the liquid is in contact with the sensing part of the pressure sensor.
As a further improvement of the above technical solution, a distance between the liquid level of the liquid and the pressure measuring hole is greater than 0.
As a further improvement of the above technical solution, the liquid includes distilled water.
As a further improvement of the above technical solution, the liquid comprises glycerol.
As a further improvement of the technical scheme, the connecting pipe is a glass fiber pipe.
As a further improvement of the above technical solution, the pressure measuring hole and the pressure measuring module are both connected with the connecting pipe in a sealing manner.
As a further improvement of the technical scheme, the connecting pipe is connected with the model and the pressure measuring module through a clamp.
As a further improvement of the above technical solution, the pressure measuring module is provided with a fixing member for fixing the pressure measuring module.
As a further improvement of the above technical solution, the fixing member includes a bolt.
The utility model has the advantages that: the utility model provides a device for measuring the surface pressure of a model in a wind tunnel, which comprises a connecting pipe and a pressure measuring module, wherein the connecting pipe is internally provided with liquid, and the pressure measuring module is used for measuring the bottom pressure of the liquid; one end of the connecting pipe is used for being connected with a pressure measuring hole formed in the surface of the model, the other end of the connecting pipe is connected with the pressure measuring module, and the connecting pipe is communicated with the pressure measuring hole.
When the model is placed in the wind tunnel, and airflow flows through the surface of the model, gas can enter or flow out of the connecting pipe through the pressure measuring holes in the surface of the model, pressure change is generated, and at the moment, the pressure generated by the gas can act on liquid. Due to the incompressibility of the liquid, the pressure generated by the gas can be transmitted to the pressure measuring module through the liquid in real time, so that the pressure measuring module can quickly and accurately measure the pressure on the surface of the model.
After the airflow flows into the pressure measuring holes, the pressure is transmitted to the pressure measuring module through liquid, and the pressure measured by the pressure measuring module is the pressure value of the position corresponding to the pressure measuring holes on the surface of the model, so that the pressure measuring module can measure the pressure value of the local small range of the surface of the model, and the spatial resolution of measurement is improved.
Because the propagation speed of the pressure disturbance in the liquid is high, the pressure measuring module can measure the pressure change of the model surface in a very short time even in a high-speed wind tunnel, thereby realizing the real-time measurement of the pressure.
The device for measuring the surface pressure of the model in the wind tunnel has the following advantages: the method can be applied to high-speed wind tunnels to improve the measurement frequency response; the pressure of the local small range of the surface of the model can be measured, and the measurement resolution is improved; real-time measurement of the surface pressure of the model can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a schematic diagram of a device for measuring the surface pressure of a model in a wind tunnel;
Fig. 2 shows a flow chart of a method for using a device for measuring the surface pressure of a model in a wind tunnel.
Description of the main element symbols:
100-connecting pipe; 200-a pressure measuring module; 300-a model; 400-pressure measuring hole; 500-a pressure sensor; 600-guide pillars.
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 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 exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present 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 limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Example one
Referring to fig. 1, in the present embodiment, a device for measuring a surface pressure of a model in a wind tunnel is provided, including a connecting pipe 100 in which a liquid is disposed and a pressure measuring module 200 for measuring a bottom pressure of the liquid.
one end of the connection pipe 100 is used to connect to a pressure measuring hole 400 provided on the surface of the mold 300, and the other end of the connection pipe 100 is connected to the pressure measuring module 200. Wherein, the connection pipe 100 is communicated with the pressure measuring hole 400.
In fig. 1, the model 300 is located in a wind tunnel and the pressure measuring module 200 is located outside the wind tunnel, wherein the direction indicated by the arrow is the direction of the air flow in the wind tunnel.
The gas (including air) has a relatively large intermolecular spacing, and when it is compressed, the volume of air changes significantly. Due to the compressibility of the gas, there is a certain time delay in the transmission of pressure through the gas.
The liquid has smaller intermolecular spacing than that of gas and is difficult to compress, and the liquid has certain fluidity, so that the pressure can be transmitted in real time by the liquid.
In this embodiment, air and water can be taken as examples to compare the propagation speeds of pressure disturbances in two media.
In an environment with a standard atmospheric pressure and a temperature of 25 ℃, the propagation speed of the pressure disturbance in the air is 346m/s, and the propagation speed in the distilled water is 1497m/s, so that the response speed of the pressure measuring module 200 can be improved by 4.33 times compared with the air by using the distilled water as a pressure transmission medium.
When a low or high velocity air stream flows through the mold 300, the pressure change on the surface of the mold 300 causes the air at the top of the connection tube 100 to compress or expand, thereby transferring the pressure to the liquid in the connection tube 100. The incompressibility of the liquid enables the pressure measuring module 200 to sense the pressure change in a very short time, and high-frequency-response pressure measurement is achieved.
Especially for high-speed airflow, the measuring device for the surface pressure of the model in the wind tunnel can accurately measure the change of the pressure and a real-time numerical value.
When the model 300 is placed in a wind tunnel and airflow flows through the surface of the model 300, gas enters or exits the connecting pipe 100 through the pressure measuring holes 400 on the surface of the model 300, and pressure change is generated, and at the moment, pressure generated by the gas acts on liquid. Due to the incompressibility of the liquid, the pressure generated by the gas is transmitted to the pressure measuring module 200 through the liquid in real time, so that the pressure measuring module 200 can quickly and accurately measure the pressure on the surface of the model 300.
After the airflow flows into the pressure measuring hole 400, the pressure is transmitted to the pressure measuring module 200 through the liquid, and the pressure measured by the pressure measuring module 200 is the pressure value of the position on the surface of the model 300 corresponding to the pressure measuring hole 400, so that the pressure measuring module 200 can measure the pressure value of a local small range on the surface of the model 300. Specifically, the size of the cross section of the pressure cell 400 may be set as required, and when the difference between the size of the cross section of the pressure cell 400 and the area of the surface of the model 300 is one thousand times or more, the position corresponding to the pressure cell 400 may be regarded as a point on the surface of the model 300.
since the propagation speed of the pressure disturbance in the liquid is high, the pressure measuring module 200 can measure the pressure change on the surface of the model 300 in an extremely short time even in a high-speed wind tunnel, thereby realizing real-time measurement of the pressure.
The device for measuring the surface pressure of the model in the wind tunnel has the following advantages: the method can be applied to high-speed wind tunnels; the local small-range pressure on the surface of the model 300 can be measured; real-time measurement of the surface pressure of the model 300 can be achieved.
A user may set a plurality of pressure taps 400 on the surface of the model 300 as needed, so as to obtain pressure values at different positions on the surface of the model 300, wherein the pressure taps 400 correspond to the connection pipes 100 one to one. Specifically, the size, number, and distribution position of the pressure measuring holes 400 may be set as needed.
In the present embodiment, the model 300 may be an airplane model, an automobile model, a building model, and the like.
In order to ensure the accuracy of pressure transmission, the liquid should have the properties of small viscosity, high stability, and no chemical reaction with the connection pipe 100.
Specifically, distilled water, glycerin, or the like can be used as the liquid.
It should be noted that air can be dissolved in the liquid, but the solubility of air in liquids such as distilled water and glycerin is very low, so the influence of air on the measurement result is negligible.
In this embodiment, the pressure measurement module 200 may use a pressure scanning valve.
The pressure scanning valve is an intelligent instrument which combines an electronic technology, a sensor technology and a calibration technology for pressure measurement, has the advantages of high measurement precision, high transmission speed, small volume, easy installation, convenient operation and the like, and is suitable for building a pressure measurement system which requires high measurement precision, high transmission speed and wide range. The pressure scanning valve is widely applied to high-precision pressure measurement in the fields of engine tests, wind tunnel tests, automobiles, ships, armored vehicles, gas turbines and the like in aerospace.
The pressure scanning valve is provided with a pressure sensor 500. Wherein the bottom of the liquid is in contact with the sensing portion of the pressure sensor 500 for measuring the pressure transmitted by the liquid.
The volume of the liquid in the connection tube 100 should be controlled within a certain range.
Too much liquid in the connection pipe 100 is inconvenient for installing the connection pipe 100, and the liquid leakage is easy to occur; too little liquid in the connection pipe 100 means that more air is present in the connection pipe 100, which affects the propagation speed of the pressure disturbance, resulting in a longer response time for the pressure measurement.
In the present embodiment, the distance between the liquid level of the liquid and the pressure measuring hole 400 is greater than 0, and meanwhile, the distance between the liquid level of the liquid and the bottom surface of the pressure measuring hole 400 may be less than 2 cm.
The volume of the connection tube 100 may not be expanded or contracted by the change of the internal pressure during the measurement. Meanwhile, the inner wall of the connection pipe 100 needs to have characteristics of smooth inner wall, low roughness, small frictional resistance, etc., so as to prevent the liquid from adhering to the inner wall to affect the transmission of pressure.
In this embodiment, the connection pipe 100 may be a glass fiber pipe. The glass fiber pipe has the advantages of high mechanical strength, ageing resistance, high temperature resistance, corrosion resistance, small friction resistance, high conveying capacity and the like.
The length of the connection pipe 100 should be suitable, and in particular, it should not be too short. Since both ends of the connection pipe 100 are connected to the model 300 and the pressure measuring module 200, respectively, if the length of the connection pipe 100 is too short, the positions of the model 300 and the pressure measuring module 200 are easily restricted and inconvenient to adjust when the model 300 and the pressure measuring module 200 are fixedly installed.
In actual use, the length of the connection pipe 100 may be set as required, and specifically, the length of the connection pipe 100 may be not less than 1 m.
In order to prevent the leakage of the liquid, the pressure measuring hole 400 and the pressure measuring module 200 are hermetically connected with the connection pipe 100. Wherein the connection pipe 100 may be connected to the mold 300 and the pressure measuring module 200 by a clip. Specifically, the connection tube 100 may be connected to the mold 300 and the pressure measuring module 200 by other sealing connection methods.
In this embodiment, the mold 300 may be provided with a guide pillar 600, and the guide pillar 600 is penetrated by the pressure measuring hole 400, wherein the guide pillar 600 may be a steel pipe disposed inside the mold 300.
the connection of the connection pipe 100 and the guide pillar 600 realizes the communication between the connection pipe 100 and the pressure measuring hole 400. When installed, the top of the connecting tube 100 may be fitted over the outer wall of the guide post 600 and then secured by a clamp.
During the measurement, the position of the pressure measuring module 200 needs to be fixed, and specifically, the pressure measuring module 200 needs to be installed outside the wind tunnel.
in order to fix the pressure measuring module 200, a fixing member for fixing the pressure measuring module 200 may be provided on the pressure measuring module 200. Wherein, the fixing member may use a bolt or the like.
In this embodiment, the bottom of the pressure measuring module 200 may be provided with a bottom plate, the bottom surface of which is a plane, wherein the bolts may be provided on the bottom plate.
The pressure scanning valve includes various electronic components such as the pressure sensor 500, and a metal shell for shielding may be disposed outside the pressure scanning valve to avoid interference of external electromagnetic signals when performing measurement. And after the pressure scanning valve is fixed, covering the metal shell on the pressure scanning valve.
The metal shell may be made of a metal material such as aluminum, copper, or iron, and may be shaped in a rectangular parallelepiped shape or a hemispherical shape.
As shown in fig. 2, in the present embodiment, a method for using a device for measuring a surface pressure of a model in a wind tunnel is further described, and the method for using the device may specifically include the following steps:
S1, connecting the connecting pipe 100 with the model 300 placed in the wind tunnel, wherein the connecting pipe 100 is communicated with the pressure measuring hole 400;
S2, adjusting the position of the pressure measuring module 200 and fixing the pressure measuring module 200, wherein the pressure measuring module 200 is positioned below the model 300;
S3, the wind tunnel is in the initial vacuum state, and the pressure value in the wind tunnel is P at the moment obtained by the vacuum pressure gauge0Meanwhile, the pressure measuring module 200 is reset to zero and used as the zero point of the pressure measuring module 200;
S4, opening the wind tunnel, and obtaining the pressure P of the pressure measuring hole 400 through the pressure measuring module 2001。
Wherein, P0and P1the sum of (1) is on the surface of the model 300The actual pressure value at the position corresponding to the pressure tap 400.
The measured pressure is affected by the liquid level of the liquid, so the position of the pressure measuring module 200 needs to be fixed to reduce the measurement error.
in a specific operation, the sequence of S2 and S3 may be adjusted, that is, after the zeroing operation is completed, the pressure measuring module 200 is fixed. It should be noted that, after the zeroing operation is completed, the position of the pressure measuring module 200 does not need to be adjusted, and the pressure measuring module 200 should be fixed at the position where the zeroing operation is performed.
The liquid can apply pressure to the pressure measuring module 200 under the action of the self weight; meanwhile, in the initial vacuum state of the wind tunnel, the gas entering the pressure measuring hole 400 generates a certain pressure on the liquid in the connection pipe 100.
Based on the two reasons, the zeroing operation is performed, so that the pressure measuring module 200 can measure the pressure more quickly and accurately. Specifically, the zeroing operation is to change the initial pressure value measured by the pressure measuring module 200 to a zero value, and then, when the measurement is performed again, the pressure measured by the pressure measuring module 200 and the initial pressure in the wind tunnel are the actual pressure value of the pressure measuring hole at the position corresponding to the pressure measuring hole on the surface of the model 300.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. The device for measuring the surface pressure of the model in the wind tunnel is characterized by comprising a connecting pipe and a pressure measuring module, wherein liquid is arranged in the connecting pipe;
One end of the connecting pipe is used for being connected with a pressure measuring hole formed in the surface of the model, the other end of the connecting pipe is connected with the pressure measuring module, and the connecting pipe is communicated with the pressure measuring hole.
2. The device for measuring the surface pressure of the model in the wind tunnel according to claim 1, wherein the pressure measuring module comprises a pressure scanning valve, and a pressure sensor is arranged on the pressure scanning valve;
The bottom of the liquid is in contact with the sensing part of the pressure sensor.
3. The device for measuring surface pressure of a model in a wind tunnel according to claim 1, wherein a distance between a liquid level of the liquid and the pressure measuring hole is larger than 0.
4. the device for measuring surface pressure of a model in a wind tunnel according to claim 1, wherein said liquid comprises distilled water.
5. The device for measuring surface pressure of a model in a wind tunnel according to claim 1, wherein said liquid comprises glycerol.
6. The device for measuring surface pressure of a phantom in a wind tunnel according to claim 1, wherein said connecting tube is a glass fiber tube.
7. The device for measuring surface pressure of a model in a wind tunnel according to claim 1, wherein the pressure cell and the pressure measuring module are hermetically connected to the connection pipe.
8. The device for measuring surface pressure of a model in a wind tunnel according to claim 1, wherein the connecting pipe is connected to the model and the pressure measuring module by a clamp.
9. The device for measuring surface pressure of a model in a wind tunnel according to claim 1, wherein the pressure measuring module is provided with a fixing member for fixing the pressure measuring module.
10. the device for measuring surface pressure of a model in a wind tunnel according to claim 9, wherein the fixing member comprises a bolt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920960450.3U CN209802626U (en) | 2019-06-24 | 2019-06-24 | Device for measuring surface pressure of model in wind tunnel |
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| CN201920960450.3U CN209802626U (en) | 2019-06-24 | 2019-06-24 | Device for measuring surface pressure of model in wind tunnel |
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| CN209802626U true CN209802626U (en) | 2019-12-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174235A (en) * | 2019-06-24 | 2019-08-27 | 中山大学 | The measuring device and its application method of a kind of surface pressing of model in wind-tunnel |
| CN112113740A (en) * | 2020-11-18 | 2020-12-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Pressure measuring device, pressure measuring method and wind tunnel local airflow deflection angle measuring method |
-
2019
- 2019-06-24 CN CN201920960450.3U patent/CN209802626U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174235A (en) * | 2019-06-24 | 2019-08-27 | 中山大学 | The measuring device and its application method of a kind of surface pressing of model in wind-tunnel |
| CN112113740A (en) * | 2020-11-18 | 2020-12-22 | 中国空气动力研究与发展中心低速空气动力研究所 | Pressure measuring device, pressure measuring method and wind tunnel local airflow deflection angle measuring method |
| CN112113740B (en) * | 2020-11-18 | 2021-02-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Pressure measuring device, pressure measuring method and wind tunnel local airflow deflection angle measuring method |
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