CN216433465U - Experimental device for be used for bottom pressure measurement - Google Patents
Experimental device for be used for bottom pressure measurement Download PDFInfo
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- CN216433465U CN216433465U CN202123367643.4U CN202123367643U CN216433465U CN 216433465 U CN216433465 U CN 216433465U CN 202123367643 U CN202123367643 U CN 202123367643U CN 216433465 U CN216433465 U CN 216433465U
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Abstract
The utility model belongs to the technical field of the wind-tunnel experiment technique and specifically relates to an experimental apparatus for be used for bottom pressure measurement. The experimental device for measuring the bottom pressure comprises a pitching servo mechanism, a support rod, a bottom pressure rake and a balance; the base of the pitching servo mechanism is fixedly connected to the upper tunnel wall of the wind tunnel body, the upper end of the vertical rod is connected with the base, and the vertical rod is suspended in the wind tunnel body; one end of the pre-deflection angle joint is fixedly connected to the lower end of the vertical rod, and the other end of the pre-deflection angle joint is fixedly connected to the tail end of the supporting rod; the front end of the supporting rod is provided with a six-component balance, the six-component balance is connected with the test model through a taper sleeve, and the bottom pressure rake is fixed on the supporting rod; the bottom pressure pipes on the bottom pressure rake are arranged in 4 circles, and 8 pressure measuring pipes are arranged on each circle at equal intervals, and the number of the pressure measuring pipes is 32. The more comprehensive bottom pressure distribution condition can be obtained by using the measurement result of the bottom pressure rake, and more accurate bottom pressure data can be obtained by using 32-point data through a weighted average method when the bottom pressure data is calculated.
Description
Technical Field
The utility model belongs to the technical field of the wind-tunnel experiment technique and specifically relates to an experimental apparatus for be used for bottom pressure measurement.
Background
With the continuous improvement of the comprehensive performance of advanced missile weapons and hypersonic aircrafts, the requirements of model developers on the quality of wind tunnel test data are further increased, wherein how to accurately measure the bottom pressure data of a wind tunnel test model is particularly important for calculating the total resistance of the model.
At present, 4 bottom pressure pipes are uniformly distributed in the model bottom pressure measurement in the low-speed wind tunnel test, and then the average value is calculated. A bottom pressure test of the bottom pressure rake measuring model finds that the bottom pressure of the model is distributed uniformly in a small attack angle state, and 4 bottom pressure pipes are uniformly distributed to measure the bottom pressure without problems. However, in a large attack angle state, the flow at the bottom of the model is relatively complex, which may cause uneven distribution of pressure at the bottom of the model, and if a method of measuring bottom pressure by uniformly distributing 4 bottom pressure pipes and averaging the bottom pressure is used, the bottom pressure data will be deviated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be used for bottom pressure measurement's experimental apparatus, this experimental apparatus can solve the problem that prior art medium bottom pressure data produced the deviation.
The utility model provides an experimental device for bottom pressure measurement, which comprises a pitching servo mechanism, a support rod, a bottom pressure rake and a balance;
the pitching servo mechanism comprises a base, a vertical rod and a pre-deflection angle joint;
the base is fixedly connected to the upper tunnel wall of the wind tunnel body, the upper end of the upright rod is connected with the base, and the upright rod is suspended in the wind tunnel body;
one end of the pre-deflection angle joint is fixedly connected to the lower end of the vertical rod, and the other end of the pre-deflection angle joint is fixedly connected to the tail end of the supporting rod;
the front end of the supporting rod is provided with a six-component balance, the six-component balance is connected with the test model through a taper sleeve, and the bottom pressure rake is fixed on the supporting rod;
the bottom pressure rake is provided with 4 circles of pressure measuring pipes, the pressure measuring pipes are arranged in 4 circles, and 8 pressure measuring pipes are arranged on each circle at equal intervals.
Preferably, the bottom pressure rake comprises a base and a rake arm;
a plurality of uniformly distributed rake arms are arranged around the base;
one end of the harrow arm is connected with the base, and the harrow arms are distributed along the radial direction of the base;
each harrow arm is provided with a plurality of mounting holes at equal intervals.
Preferably, eight rake arms are arranged around the base, and each rake arm is provided with four mounting holes;
and each mounting hole is correspondingly provided with a pressure measuring pipe, and the pressure measuring pipes at the same position of the rake arm are distributed on the same circular track.
Preferably, the base is of an annular structure, and the base is sleeved on the support rod;
one end of the rake arm is connected with the outer ring of the base, and the other end of the rake arm is abutted against the inner wall of the test model.
Preferably, the test model is provided with a hollow cavity, and the distance between the arrangement position of the bottom pressure rake and the bottom of the test model is 9-11 mm.
Preferably, the distance between the setting position of the bottom pressure rake and the bottom of the test model is 10 mm.
Has the advantages that:
the bottom pressure pipes on the bottom pressure rake are arranged in 4 circles, and 8 pressure measuring pipes are arranged on each circle at equal intervals, and the number of the pressure measuring pipes is 32. The more comprehensive bottom pressure distribution condition can be obtained by using the measurement result of the bottom pressure rake, and more accurate bottom pressure data can be obtained by using 32-point data through a weighted average method when the bottom pressure data is calculated.
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 embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a usage state of an experimental apparatus for bottom pressure measurement according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bottom pressure rake according to an embodiment of the present invention (a circle formed by dotted lines in the figure is a same circular track distributed on the piezometric tubes at the same position of the rake arm).
Description of reference numerals:
1: a pre-deflection angle joint; 2: a strut; 3: bottom pressure raking; 4: a balance; 5: a test model; 6: a wind tunnel;
31: a mounting seat; 32: a rake arm; 33: and (7) installing holes.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 and 2, in the present embodiment, an experimental apparatus for bottom pressure measurement is provided, and includes a pitch servo mechanism, a support rod 2, a bottom rake 3, and a balance 4.
The pitching servo mechanism comprises a base, a vertical rod and a pre-deflection angle joint 1.
The base is fixedly connected to the upper wall of the wind tunnel 6, the upper end of the vertical rod is connected with the base, and the vertical rod is suspended in the wind tunnel 6.
One end of the pre-deviation angle joint 1 is fixedly connected to the lower end of the vertical rod, and the other end of the pre-deviation angle joint 1 is fixedly connected to the tail end of the supporting rod 2.
The front end of the supporting rod 2 is provided with a six-component balance 4, the six-component balance 4 is connected with a test model 5 through a taper sleeve, and the bottom pressure rake 3 is fixed on the supporting rod 2.
The bottom pressure rake 3 is provided with 4 circles of pressure measuring pipes which are arranged for 4 circles, and 8 pressure measuring pipes are arranged on each circle at equal intervals.
In the present embodiment, the bottom pressure pipes are arranged on the bottom pressure rake 3 for 4 circles, and 8 pressure measuring pipes are arranged on each circle at equal intervals, and 32 pressure measuring pipes are arranged. The more comprehensive bottom pressure distribution condition can be obtained by using the measurement result of the bottom pressure rake 3, and more accurate bottom pressure data can be obtained by using 32-point data through a weighted average method when the bottom pressure data is calculated.
Specifically, the bottom rake 3 includes a mount 31 and a rake arm 32. A plurality of uniformly distributed rake arms 32 are arranged around the mounting base 31.
One end of the harrow arm 32 is connected with the mounting seat 31, the harrow arms 32 are distributed along the radial direction of the base, and each harrow arm 32 is provided with a plurality of mounting holes 33 at equal intervals.
Eight rake arms 32 are arranged around the mounting seat 31, and each rake arm 32 is provided with four mounting holes 33. A pressure measuring pipe is correspondingly arranged in each mounting hole 33, and the pressure measuring pipes positioned at the same position of the rake arm 32 are distributed on the same circular track.
The mounting seat 31 is of an annular structure, the mounting seat 31 is sleeved on the supporting rod 2, one end of the rake arm 32 is connected with the outer ring of the base, and the other end of the rake arm 32 is abutted against the inner wall of the test model 5.
The bottom pressure rake 3 provided by the application can realize the installation of 32 pressure measuring pipes, can provide the stability of the installation of the pressure measuring pipes and further can provide the accuracy of measuring results.
The test model 5 is provided with a hollow cavity, and the distance between the setting position of the bottom pressure rake 3 and the bottom of the test model 5 is 9-11 mm. Specifically, the distance between the setting position of the bottom pressure rake 3 and the bottom of the test model 5 is 10 mm.
In order to further explain the experimental apparatus for bottom pressure measurement, in this embodiment, a specific embodiment of the experimental apparatus for bottom pressure measurement is also provided.
a. Mounting a pre-deflection angle joint 1;
b. mounting a support rod 2;
c. installing a bottom pressing rake 3;
d. installing a balance 4;
e. installing a test model 5 and adjusting the position of the bottom pressure rake 3;
f. the test was started.
Adjusting the initial state angle of the model through a pitching servo mechanism, and driving the wind tunnel 6; after the wind speed is stabilized, a set of attitude angles are changed for testing. When a certain attitude angle is in place, the required test parameters under the attitude angle can be obtained.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. An experimental device for measuring bottom pressure is characterized by comprising a pitching servo mechanism, a supporting rod, a bottom pressure rake and a balance;
the pitching servo mechanism comprises a base, a vertical rod and a pre-deflection angle joint;
the base is fixedly connected to the upper tunnel wall of the wind tunnel body, the upper end of the upright rod is connected with the base, and the upright rod is suspended in the wind tunnel body;
one end of the pre-deviation angle joint is fixedly connected to the lower end of the vertical rod, and the other end of the pre-deviation angle joint is fixedly connected to the tail end of the supporting rod;
the front end of the supporting rod is provided with a six-component balance, the six-component balance is connected with the test model through a taper sleeve, and the bottom pressure rake is fixed on the supporting rod;
the bottom pressure rake is provided with 4 circles of pressure measuring pipes, the pressure measuring pipes are arranged in 4 circles, and 8 pressure measuring pipes are arranged on each circle at equal intervals.
2. The experimental apparatus for bottom pressure measurement according to claim 1, wherein the bottom pressure rake comprises a base and a rake arm;
a plurality of uniformly distributed rake arms are arranged around the base;
one end of the harrow arm is connected with the base, and the harrow arms are distributed along the radial direction of the base;
each harrow arm is provided with a plurality of mounting holes at equal intervals.
3. The experimental device for bottom pressure measurement according to claim 2, wherein eight rake arms are arranged around the base, and each rake arm is provided with four mounting holes;
and each mounting hole is correspondingly provided with a pressure measuring pipe, and the pressure measuring pipes at the same position of the rake arm are distributed on the same circular track.
4. The experimental device for bottom pressure measurement according to claim 2, wherein the base is of a ring structure and is sleeved on the support rod;
one end of the rake arm is connected with the outer ring of the base, and the other end of the rake arm is abutted against the inner wall of the test model.
5. The experimental device for bottom pressure measurement according to claim 1, wherein the test model has a hollow cavity, and the bottom pressure rake is arranged 9mm-11mm away from the bottom of the test model.
6. The experimental device for bottom pressure measurement according to claim 5, wherein the bottom pressure rake is arranged 10mm away from the bottom of the test model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123367643.4U CN216433465U (en) | 2021-12-29 | 2021-12-29 | Experimental device for be used for bottom pressure measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123367643.4U CN216433465U (en) | 2021-12-29 | 2021-12-29 | Experimental device for be used for bottom pressure measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216433465U true CN216433465U (en) | 2022-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123367643.4U Active CN216433465U (en) | 2021-12-29 | 2021-12-29 | Experimental device for be used for bottom pressure measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216433465U (en) |
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2021
- 2021-12-29 CN CN202123367643.4U patent/CN216433465U/en active Active
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