CN214502836U - Cavity noise suppression wind tunnel test device based on sound absorption material - Google Patents
Cavity noise suppression wind tunnel test device based on sound absorption material Download PDFInfo
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- CN214502836U CN214502836U CN202121009785.0U CN202121009785U CN214502836U CN 214502836 U CN214502836 U CN 214502836U CN 202121009785 U CN202121009785 U CN 202121009785U CN 214502836 U CN214502836 U CN 214502836U
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Abstract
A cavity noise suppression wind tunnel test device based on a sound absorption material belongs to the technical field of aerodynamic wind tunnel tests. The invention adopts a tail support mode to connect with the wind tunnel through the support rod, solves the problem of mounting sound absorption materials on the cavity test model, and can effectively solve the problems of severe noise and self-sustaining pressure oscillation in the cavity. The invention comprises a shell, a cavity body, a front upper cover, an upper cover plate, a rear upper cover, a bottom cover, a support rod, a sensor pin and other parts. The front edge of the shell adopts a shape design of washing. The base, the pressing plate, the outer substrate, the base plate, the bottom box, the bottom plate, the perforated plate and the like form a cavity main body model which can be combined to form a plurality of cavity configurations with length-depth ratios. Static and dynamic pressure measurement points can be installed through the sensor pins for cavity steady state pressure and dynamic pressure noise measurements. The invention can realize various test configurations without adding sound-absorbing materials and with different sound-absorbing materials, and solves the problem of consistent reference size of the cavities of various test configurations.
Description
Technical Field
The invention relates to a wind tunnel test device, in particular to a cavity noise suppression wind tunnel test device based on a sound absorption material, and belongs to the technical field of aviation aerodynamic wind tunnel tests.
Background
Cavities are widely present on modern aircraft. Despite its simple geometry, the flow is quite complex, including a range of unsteady flow characteristics such as high aerodynamic noise, shear-layer instability, turbulence, shock/swell wave interference, shock/shear-layer interference, flow-induced resonance, and turbulence. Therefore, the measure of noise and flow comprehensive control is adopted, the pneumatic noise is reduced, the unsteady flow in the cavity is improved, and the method has important significance.
For the cavity of an aircraft, there are mainly several problems to be solved: the first is high-intensity pneumatic noise, namely after the cavity is exposed to free incoming flow, an unstable shear layer with high-frequency oscillation can be formed, and feedback sound waves after the shear layer impacts the rear wall can form self-sustaining oscillation in the cavity, so that the high-intensity pneumatic noise is formed, and the sound pressure level reaches 160-180 dB; the second is structural coupling, that is, the frequency of noise may reach 50-60Hz, which is close to the natural frequency of the coupling of the body, and it will produce acoustic fatigue and even damage to the cavity structure and the electronic equipment in the cabin. Meanwhile, in the aspect of airplane structural design, in order to avoid damage to the cavity and the airplane body caused by high-strength noise, the damage is avoided only by improving the structural strength of the airplane body, the structural weight of the airplane body is inevitably increased, and the overall performance of the airplane is greatly damaged.
Wind tunnel test is one of important research means for researching aircraft cavity noise suppression, and at present, cavity research is mainly focused on the aspects of flow field and flow field control in a cabin, and a main passive controller/exciter is additionally arranged on the front edge of a cavity, so that airplane equipment, weight, complexity and the like are increased. The noise reduction method for the aircraft cavity based on the sound absorption material controls the cavity from two aspects of flow and noise without introducing additional equipment such as an air source and a control system, so that better noise consistency is realized, and the problems of severe noise and self-sustaining pressure oscillation in the aircraft cavity are solved.
Disclosure of Invention
The invention aims to provide a cavity noise suppression wind tunnel test device based on sound absorption materials, which can realize wind tunnel test measurement of noise suppression characteristics of cavity test configurations additionally provided with different sound absorption materials and solve the problem of consistent reference sizes of cavities of various test configurations.
A cavity noise suppression wind tunnel test device based on sound absorption materials comprises a shell and a cavity main body, wherein the cavity main body is arranged in the shell and is divided into an upper cavity and a lower cavity, and static and dynamic pressure measuring points are installed on the cavity main body.
Preferably: the shell comprises a shell, a front upper cover, a rear upper cover and a bottom cover; the shell is respectively provided with a front upper cover, a rear upper cover and a bottom cover.
Preferably: the upper cavity comprises an upper cover plate, a base, a pressing plate, an outer substrate and a perforated plate; a plurality of bases all set up on the casing, and the upper cover plate sets up on a plurality of bases, is connected through outer base plate between two adjacent bases, and the perforated plate passes through the clamp plate to be installed on a plurality of bases, and upper cover plate, base, clamp plate, outer base plate, perforated plate combination form the upper chamber body.
Preferably: a backing plate is arranged between the outer substrate and the perforated plate.
Preferably: the lower cavity is a bottom box, the bottom box is connected with the upper cavity, and a perforated plate is arranged between the bottom box and the upper cavity.
Preferably: the bottom of the bottom box is of an open structure, the bottom plate is arranged at the bottom of the bottom box, and the bottom box is sealed through the bottom plate.
Preferably: the wind tunnel tail support is arranged in the wind tunnel, and the free end of the wind tunnel tail support is connected with the shell.
Preferably: the wind tunnel tail support is connected with the shell through a support rod.
Preferably: static and dynamic pressure measurement points are provided on the housing and the cavity body by sensor pins.
Compared with the existing product, the invention has the following effects:
the test device adopts the shell with special appearance design, and is more suitable for the wind tunnel test research of the noise characteristics of the cavity model. The cavity main body adopts a split type design, and multiple noise suppression configurations can be formed after the same cavity main body is additionally provided with the sound absorption material. The upper cavity and the lower cavity are respectively matched with the bottom box to form cavity configurations with different length-depth ratios. The sensor pin is used for installing and installing a steady-state pressure measuring steel pipe or a dynamic pressure sensor, so that the measurement of steady-state pressure and dynamic pressure noise in the cavity is realized.
Drawings
FIG. 1 is a schematic structural diagram of a cavity noise suppression wind tunnel test device based on a sound absorption material;
FIG. 2 is a schematic structural view of a cavity body;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a side view of FIG. 3;
FIG. 5 is an enlarged view at A of FIG. 3;
FIG. 6 is an enlarged view at B of FIG. 4;
fig. 7 is a schematic view of the structure of the sensor pin.
In the figure: 1-shell, 2-front upper cover, 3-upper cover plate, 4-rear upper cover, 5-bottom cover, 6-support rod, 7-wind tunnel tail support, 8-wind tunnel, 9-base, 10-pressing plate, 11-outer base plate, 12-backing plate, 13-bottom box, 14-bottom plate, 15-perforated plate and 16-sensor pin.
Detailed Description
Preferred embodiments of the present invention are explained in detail below with reference to the accompanying drawings.
The specific implementation mode is as follows: as shown in figures 1 to 7, the cavity noise suppression wind tunnel test device based on the sound absorption material comprises a shell and a cavity main body, wherein the cavity main body is arranged in the shell, the cavity main body is divided into an upper cavity and a lower cavity, and static and dynamic pressure measuring points are arranged on the cavity main body.
The shell comprises a shell 1, a front upper cover 2, a rear upper cover 4 and a bottom cover 5; the shell 1 is provided with a front upper cover 2, a rear upper cover 4 and a bottom cover 5 respectively, and the front edge of the shell 1 adopts a shape design of washing down, so that the uniformity and consistency of incoming flow on the upper surface of the cavity can be ensured.
The upper cavity comprises an upper cover plate 3, a base 9, a pressure plate 10, an outer substrate 11 and a perforated plate 15; a plurality of bases 9 all set up on the casing, and upper cover plate 3 sets up on a plurality of bases 9, is connected through outer base plate 11 between two adjacent bases 9, and perforated plate 15 passes through clamp plate 10 to be installed on a plurality of bases 9, and upper cover plate 3, base 9, clamp plate 10, outer base plate 11, perforated plate 15 make up and form the upper chamber body. Wherein the pedestal 9 is connected with the outer substrate 11 to form the outer contour of the cavity, the pedestal 9 is connected with the pressure plate 10, and the perforated plate 15 is arranged in the middle to form the reference dimension of the cavity.
A backing plate 12 is arranged between the outer substrate 11 and the perforated plate 15.
The lower cavity is a bottom box 13, the bottom box 13 is connected with the upper cavity, and a perforated plate 15 is arranged between the bottom box 13 and the upper cavity.
The bottom of the bottom box 13 is an open structure, the bottom plate 14 is arranged at the bottom of the bottom box 13, and the bottom box 13 is closed by the bottom plate 14.
The cavity body is composed of a base 9, a pressure plate 10, an outer substrate 11, a backing plate 12, a bottom box 13, a bottom plate 14, a perforated plate 15 and the like; the perforated plate 15 serves as a guard plate of the sound absorbing material to prevent the airflow from damaging the sound absorbing material, and a sound absorbing configuration of the perforated plate + the sound absorbing material is formed, and the perforated plate 15 can also be replaced by a micro-perforated plate, forming a sound absorbing structure of the micro-perforated plate + the cavity, for suppressing the noise in the cavity. A backing plate 12 with different thicknesses can be arranged between the outer substrate 11 and the perforated plate 15 to change the thickness of the cavity in the sound absorption structure, so that the sound absorption structure of the perforated plate + the sound absorption material + the cavity or the perforated plate + the cavity + the sound absorption material is formed, and the low-frequency sound absorption characteristic of the structure is improved; the upper and lower cavities may form cavity configurations of different aspect ratios. The steady state pressure sensor and the dynamic pressure sensor are connected by a number of sensor pins 16 to measure the flow and noise characteristics within the cavity.
The wind tunnel tail support is characterized by further comprising a wind tunnel 8 and a wind tunnel tail support 7 arranged in the wind tunnel 8, and the free end of the wind tunnel tail support 7 is connected with the shell.
The wind tunnel tail support 7 is connected with the shell through a support rod 6.
Static and dynamic pressure measuring points can be arranged on the outer base plate 11, the bottom plate 14, the base plate 12, the front cover plate 2 and the rear cover plate 4 through the sensor pins 16, so that the measurement of the steady-state pressure and the dynamic pressure noise of the cavity is realized, and the static and dynamic pressure measuring points are respectively connected with the steady-state pressure sensor and the dynamic pressure sensor through the sensor pins 16 to measure the flow and noise characteristics in the cavity.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.
This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.
Claims (9)
1. The utility model provides a cavity noise suppression wind tunnel test device based on sound absorbing material which characterized in that: the pressure measuring device comprises a shell and a cavity body, wherein the cavity body is arranged in the shell and is divided into an upper cavity and a lower cavity, and static and dynamic pressure measuring points are arranged on the cavity body.
2. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 1, wherein: the shell comprises a shell (1), a front upper cover (2), a rear upper cover (4) and a bottom cover (5); the shell (1) is respectively provided with a front upper cover (2), a rear upper cover (4) and a bottom cover (5).
3. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 1 or 2, wherein: the upper cavity comprises an upper cover plate (3), a base (9), a pressing plate (10), an outer substrate (11) and a perforated plate (15); a plurality of bases (9) are all arranged on the shell, the upper cover plate (3) is arranged on the plurality of bases (9), two adjacent bases (9) are connected through the outer base plate (11), the perforated plate (15) is installed on the plurality of bases (9) through the pressing plate (10), and the upper cover plate (3), the bases (9), the pressing plate (10), the outer base plate (11) and the perforated plate (15) are combined to form an upper cavity.
4. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 3, wherein: and a backing plate (12) is arranged between the outer substrate (11) and the perforated plate (15).
5. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 1 or 2, wherein: the lower cavity is a bottom box (13), the bottom box (13) is connected with the upper cavity, and a perforated plate (15) is arranged between the bottom box (13) and the upper cavity.
6. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 5, wherein: the bottom of the bottom box (13) is of an open structure, the bottom plate (14) is arranged at the bottom of the bottom box (13), and the bottom box (13) is closed through the bottom plate (14).
7. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 1 or 2, wherein: the wind tunnel type wind power generation device is characterized by further comprising a wind tunnel (8) and a wind tunnel tail support (7) arranged in the wind tunnel (8), wherein the free end of the wind tunnel tail support (7) is connected with the shell.
8. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 7, wherein: the wind tunnel tail support (7) is connected with the shell through a support rod (6).
9. The cavity noise suppression wind tunnel test device based on the sound absorption material as claimed in claim 1 or 2, wherein: the static and dynamic pressure measurement points are provided on the housing and cavity body by sensor pins (16).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121009785.0U CN214502836U (en) | 2021-05-12 | 2021-05-12 | Cavity noise suppression wind tunnel test device based on sound absorption material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121009785.0U CN214502836U (en) | 2021-05-12 | 2021-05-12 | Cavity noise suppression wind tunnel test device based on sound absorption material |
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| CN214502836U true CN214502836U (en) | 2021-10-26 |
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| CN202121009785.0U Expired - Fee Related CN214502836U (en) | 2021-05-12 | 2021-05-12 | Cavity noise suppression wind tunnel test device based on sound absorption material |
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