A flow guide and noise reduction integrated flow guide wall

Abstract

The utility model discloses a kind of flow guiding and noise reduction integrated flow guiding wall, including wall body and the support frame of setting in the back of wall body, the wall body includes more than one integrated flow guiding noise reduction component, flow guiding noise reduction component includes from front to back flow guide plate, sound-absorbing layer and back seal plate, cavity is formed between flow guide plate and back seal plate, sound-absorbing layer is arranged in cavity, perforation is arranged on flow guide plate, flange extending rearward is arranged on the edge of perforation on flow guide plate, pipeline is connected on flange, pipeline is extended into sound-absorbing layer, the maximum cross section inner diameter of pipeline is greater than the inner diameter of flange, sound outlet leading to sound-absorbing layer is arranged on pipeline. Utilize the structure of the utility model, low frequency, mid-frequency and high frequency of sound wave in aircraft engine wake flow all have noise reduction effect, can achieve the purpose of wideband noise reduction.

Description

Technical Field

[0001] This utility model relates to the field of fluid flow guidance and noise reduction technology, specifically a flow guidance wall that integrates flow guidance and noise reduction. Background Technology

[0002] To ensure the safety and stability of aircraft flight, it is generally necessary to conduct regular or irregular tests on the performance of aircraft engines, such as thrust. The exhaust velocity of civil aircraft engines is typically between 50-91 meters per second, depending on the aircraft type and flight conditions. For other specialized aircraft engines, the exhaust velocity is even higher. Therefore, if the direction of the engine exhaust is not changed in time during engine testing, it can cause significant harm to personnel and property, and also generate considerable noise. This has led to the development of deflector walls or blow-off barriers. Deflector walls are devices used to change the direction of aircraft engine exhaust flow and also reduce noise; they are mainly used in testing environments such as airports. Traditional deflector walls are mainly made of reinforced concrete. This type of deflector wall is difficult to maintain and has high replacement costs. Therefore, deflector walls made of welded steel were later developed.

[0003] Patent document CN104890895B discloses a noise-reducing guide wall for aircraft ground testing. The guide wall is curved along its length, surrounding the outer side of the airflow emitted during aircraft testing. The guide wall includes a wall body anchored to a ground foundation. The windward side of the wall has an arc shape that guides the airflow upwards into the air. A supporting truss is anchored to the leeward side of the wall, with the bottom of the supporting truss anchored to the ground foundation. The wall body, from the windward side to the leeward side, consists of a stainless steel microporous plate, a sound-absorbing plate, a sound-insulating plate, a cavity layer, and a back sealing plate. This guide wall, firmly fixed to the ground foundation, employs a multi-stage sound-absorbing structure on the windward side to reduce noise. The arc-shaped windward side guides the incoming airflow into the air, ensuring the safety of objects, vehicles, and personnel outside the guide wall, as well as their normal work, by reducing both noise and wind speed. It eliminates any safety hazards, strengthens noise pollution control, benefits residents within and around the airport, and contributes to creating a green airport.

[0004] The noise reduction principle of the above-mentioned airflow guide wall is as follows: When the sound waves from the aircraft wake enter the tiny gaps of the sound-absorbing plate through the stainless steel microporous plate, the sound energy is converted into heat energy and consumed due to friction and viscous resistance, thereby playing a role in noise reduction. The sound insulation plate effectively blocks the direct propagation of the sound waves. This method is effective for mid-to-high frequency sound waves, but for aircraft engines, there are also low-frequency sound waves in the airflow. The above structure is effective for low-frequency sound waves, so it is difficult to achieve broadband noise reduction. Utility Model Content

[0005] The purpose of this invention is to provide an integrated airflow guiding and noise reduction airflow wall. Utilizing the structure of this invention, it can reduce noise in the low, mid, and high frequencies of sound waves in the exhaust of aircraft engines, achieving broadband noise reduction.

[0006] To achieve the above objectives, an integrated airflow guiding and noise reduction wall includes a wall body and a support frame disposed on the back of the wall body. The wall body includes one or more integrated airflow guiding and noise reduction components. Each airflow guiding and noise reduction component includes, from front to back, a guide plate, a sound-absorbing layer, and a back sealing plate. A cavity is formed between the guide plate and the back sealing plate. The sound-absorbing layer is disposed within the cavity. Perforations are provided on the guide plate. A rearwardly extending flange is provided on the guide plate at the edge of the perforations. A pipe is connected to the flange and extends into the sound-absorbing layer. The maximum cross-sectional inner diameter of the pipe is larger than the inner diameter of the flange. A sound outlet leading into the sound-absorbing layer is provided on the pipe.

[0007] The aforementioned structure, with its perforations and sound-absorbing layer, allows sound waves generated by the aircraft's exhaust stream to enter the sound-absorbing layer. Due to friction and viscous resistance, the sound energy is converted into heat energy and dissipated. Simultaneously, the sound-absorbing layer absorbs the sound, thus effectively reducing noise in mid-to-high frequency sound waves. Because of the flange and duct, with the duct's cross-section being larger than the flange's, the sound waves pass through the perforations, flange, and duct in sequence. This change in cross-section alters the impedance of the sound waves, causing reflection and interference during propagation, thereby canceling out some of the sound energy. This structure is particularly effective at reducing low-frequency noise. Therefore, using the structure of this invention, noise reduction can be effectively achieved for low-frequency, mid-frequency, and high-frequency sound waves, thus realizing broadband noise reduction.

[0008] Furthermore, the pipe includes a front connecting part, a noise reduction part, a rear connecting part, and a bottom connected in sequence. The front end of the front connecting part is fitted onto the flange, and the noise reduction part extends outwards obliquely from front to back and then extends in a straight line. By providing the front connecting part, it is convenient to connect the pipe to the flange, and by providing the rear connecting part, it is convenient to connect to the bottom.

[0009] Furthermore, the front connecting part is welded to the flange.

[0010] Furthermore, the noise reduction section and the rear connection section are integrated into one structure.

[0011] Furthermore, the rear connecting part is a hollow cylinder, with its bottom including a base plate and a connecting wall that bends forward from the edge of the base plate. The connecting wall is sleeved or inserted into the rear connecting part. In this way, the bottom can be easily connected to the rear connecting part via the connecting wall.

[0012] Furthermore, the connecting wall is welded to the rear connecting part.

[0013] Furthermore, the sound outlet is a sound hole located on the bottom and / or the noise reduction section.

[0014] Furthermore, a chamfer is provided on the front edge of the perforation on the guide plate. This reduces the resistance to airflow entering the perforation.

[0015] Furthermore, a first outer step is provided at the rear end of the flange, and a first inner step is provided inside the front end of the front connecting part, with the first outer step inserted into the first inner step. This achieves the positioning of the front connecting part and the flange.

[0016] Furthermore, a second outer step is provided at the rear end of the rear connecting part, and a second inner step is provided at the front end of the bottom, with the second outer step inserted into the second inner step. In this way, the rear connecting part is positioned and connected to the bottom. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a flow-guiding and noise-reducing integrated flow-guiding wall.

[0018] Figure 2 This is an assembly diagram consisting of a support frame unit and a reverse flow noise reduction component.

[0019] Figure 3 for Figure 1 A magnified view of A in the middle.

[0020] Figure 4 This is a schematic diagram of part of the guide vane, flange, and pipe.

[0021] Figure 5 This is a partial schematic diagram of the air deflector.

[0022] Figure 6 for Figure 4 A magnified view of B in the middle.

[0023] Figure 7 Partial cross-sectional view of the airflow diversion and noise reduction component.

[0024] Figure 8 This is a three-dimensional view of part of the guide vane, flange, and pipe.

[0025] Figure 9 This is a three-dimensional view of part of the guide vane, flange, and pipe from another perspective.

[0026] Figure 10 This is an exploded view of part of the baffle, flange, and pipe.

[0027] Figure 11 This is a front view of part of the baffle, flange, and pipe.

[0028] Figure 12 for Figure 11 CC section view. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1-2 As shown, this utility model provides an integrated flow guiding and noise reduction wall, including a wall body 100 and a support frame 200. The wall body 100 includes one or more integrated flow guiding and noise reduction components 1. If two or more flow guiding and noise reduction components 1 are provided, they are arranged sequentially in the length X direction. The support frame 200 includes support frame units 20, the same number as the flow guiding and noise reduction components 1. A flow guiding and noise reduction component 1 is fixedly installed on the front of each support frame unit 20 by bolts or welding. Adjacent flow guiding and noise reduction components 1 are connected together by pressure plates and bolts; that is, one end of the pressure plate is connected to one of the flow guiding and noise reduction components by a bolt, and the other end of the pressure plate is connected to the adjacent flow guiding and noise reduction component by a bolt. In this utility model, "front" refers to... Figure 1 The right side, "back" or "behind" refers to Figure 1 On the left side.

[0031] like Figure 1 and Figure 3 As shown, the airflow-guiding and noise-reducing component 1 includes a front-to-rear airflow guide plate 11, a sound-absorbing layer 15, and a back sealing plate 13. A frame 14 is provided between the airflow guide plate 11 and the back sealing plate 13. The frame 14 includes a front frame mesh 141, a rear frame mesh 142, and a connecting beam 143. The front frame mesh 141 is welded together from a front crossbeam and a front longitudinal beam, and the rear frame mesh 142 is welded together from a rear crossbeam and a rear longitudinal beam. A connecting beam 143 is welded between the front frame mesh 141 and the rear frame mesh 142. A cavity 10 is formed between the airflow guide plate 11 and the back sealing plate 13. In this embodiment, the cavity 10 is formed by the space between the front frame mesh 141 and the rear frame mesh 142. The sound-absorbing layer 15 is disposed in the cavity 10. In this embodiment, the sound-absorbing layer 15 is a glass wool sound-absorbing layer, a rock wool sound-absorbing layer, or a ceramic fiber sound-absorbing layer.

[0032] like Figures 3 to 7 As shown, a perforation 111 is provided on the guide plate 11, and a chamfer 113 is provided on the guide plate 11 at the front edge of the perforation 111. In this example, the chamfer 113 is a rounded corner, which reduces the resistance of airflow entering the perforation 111. A rearwardly extending flange 112 is provided on the guide plate 11 at the edge of the perforation 111. In this utility model, the perforation 111, the flange 112, and the chamfer 113 are formed by punching and flanging processes in cold stamping; Figure 11As shown, a first outer step portion 1121 is provided at the rear end of the flange 112. The first outer step portion 1121 can be formed by cold machining on the flange 112 using a lathe. A pipe 12 is connected to the flange 112 and extends into the sound-absorbing layer 15.

[0033] like Figures 8 to 12 As shown, the pipe 12 includes a front connecting part 121, a noise reduction part 122, a rear connecting part 123, and a bottom 124 connected in sequence. A first inner step 1211 is provided in the front end of the front connecting part 121, and a first outer step 1121 is inserted into the first inner step 1211, which enables the positioning and installation of the front connecting part 121. Then, the flange is fixedly connected to the front connecting part by welding. The noise reduction part 122 extends outward obliquely from front to back and then extends straight. The front end of the rear connecting part 123 is connected to the rear end of the noise reduction part 122, and a second outer step 1231 is provided in the rear end of the rear connecting part 123. The rear connecting part 123 is a hollow cylinder. In this embodiment, the front connecting part 121, the noise reduction part 122, and the rear connecting part 123 are an integral structure. During forming, they can be integrally formed by punching and stretching processes, or formed by turning. The bottom 124 includes a bottom plate 1241 and a connecting wall 1242 that bends forward from the edge of the bottom plate 1241. The connecting wall 1242 is sleeved or inserted into the rear connecting part 123. Specifically, a second inner step part 1243 is provided in the front end of the connecting wall 1242, and a second outer step part 1231 is inserted into the second inner step part 1243 to achieve positioning and installation of the bottom. Then, the rear connecting part 123 and the bottom 124 are fixedly connected together by welding.

[0034] like Figure 12 As shown, the maximum cross-sectional inner diameter of pipe 12 is greater than the inner diameter of flange 112. In this embodiment, the maximum cross-section of pipe 12 refers to the position with the largest inner diameter in the axial direction. Figure 12 In the figure, D, the inner diameter of flange 112 refers to... Figure 12 As shown in d, a sound outlet 120 leading to the sound-absorbing layer 15 is provided on the pipe 12. The sound outlet 120 is a sound hole 1201 provided on the bottom 124 and / or the noise reduction part 122, so that the sound waves after being reflected in the pipe can smoothly enter the sound-absorbing layer.

[0035] In this embodiment, due to the perforation and sound-absorbing layer, the sound waves generated by the aircraft's exhaust stream, passing through the perforation, enter the sound-absorbing layer. The sound energy is converted into heat energy and dissipated due to friction and viscous resistance. Simultaneously, the sound-absorbing layer absorbs the sound, thus effectively reducing noise in mid-to-high frequency sound waves. Because of the flange and duct, with the duct's cross-section being larger than the flange's, the sound waves pass through the perforation, flange, and duct sequentially. This change in cross-section alters the impedance of the sound waves, causing reflection and interference during propagation, thereby canceling out some of the sound energy. This structure is particularly effective at reducing noise in low frequencies. Therefore, using the structure of this invention, noise reduction can be effectively achieved for low-frequency, mid-frequency, and high-frequency sound waves, thus realizing broadband noise reduction.

[0036] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A flow-guiding and noise-reducing integrated flow-guiding wall, comprising a wall body (100) and a support frame (200) disposed on the back of the wall body (100), wherein the wall body (100) comprises one or more integrated flow-guiding and noise-reducing components (1), the flow-guiding and noise-reducing component (1) comprising a flow-guiding plate (11) from front to back, a sound-absorbing layer (15) and a back sealing plate (13), wherein a cavity (10) is formed between the flow-guiding plate (11) and the back sealing plate (13), and the sound-absorbing layer (15) is disposed within the cavity (10), characterized in that: A perforation (111) is provided on the guide plate (11), and a rearwardly extending flange (112) is provided on the guide plate (11) at the edge of the perforation (111). A pipe (12) is connected to the flange (112), and the pipe (12) extends into the sound-absorbing layer (15). The maximum cross-sectional inner diameter of the pipe (12) is larger than the inner diameter of the flange (112). A sound outlet (120) leading to the sound-absorbing layer (15) is provided on the pipe (12).

2. The integrated flow guiding and noise reduction flow wall according to claim 1, characterized in that: The pipe (12) includes a front connecting part (121), a noise reduction part (122), a rear connecting part (123) and a bottom (124) connected in sequence. The front end of the front connecting part (121) is sleeved on the flange (112), and the noise reduction part (122) extends outward obliquely from front to back and then extends straight.

3. The integrated flow guiding and noise reduction flow wall according to claim 2, characterized in that: The front connecting part (121) is welded to the flange (112).

4. The integrated flow guiding and noise reduction flow wall according to claim 2, characterized in that: The noise reduction part (122) and the rear connection part (123) are integrated into one structure.

5. A flow-guiding and noise-reducing integrated flow-guiding wall according to claim 2 or 4, characterized in that: The rear connecting part (123) is a hollow cylinder, and the bottom (124) includes a base plate (1241) and a connecting wall (1242) that bends forward from the edge of the base plate (1241). The connecting wall (1242) is sleeved or inserted into the rear connecting part (123).

6. The integrated flow guiding and noise reduction flow wall according to claim 5, characterized in that: The connecting wall (1242) is welded to the rear connecting part (123).

7. The integrated flow guiding and noise reduction flow wall according to claim 2, characterized in that: The sound outlet (120) is a sound hole (1201) provided on the bottom (124) and / or the noise reduction part (122).

8. The integrated flow guiding and noise reduction flow wall as described in claim 1, characterized in that, A chamfer (113) is provided on the front edge of the perforation (111) on the guide plate (11).

9. The integrated flow guiding and noise reduction flow wall as described in claim 2, characterized in that, A first outer step portion (1121) is provided at the rear end of the flange (112), and a first inner step portion (1211) is provided inside the front end of the front connecting portion (121). The first outer step portion (1121) is inserted into the first inner step portion (1211).

10. The integrated flow guiding and noise reduction flow wall as described in claim 2, characterized in that, A second outer step (1231) is provided at the rear end of the rear connecting part (123), and a second inner step (1243) is provided at the front end of the bottom (124). The second outer step (1231) is inserted into the second inner step (1243).

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