Noise reduction device of large wind tunnel
By employing a combination of resistive and capacitive noise reduction methods in large wind tunnels and optimizing the layout of the noise reduction panels, the problem of noise leakage in large wind tunnels has been solved, improving the working environment and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN UNIV OF TECH
- Filing Date
- 2025-05-22
- Publication Date
- 2026-04-21
AI Technical Summary
The noise generated during the operation of large wind tunnel laboratories interferes with the working environment and surrounding teaching areas. Existing technologies make it difficult to achieve effective noise control while ensuring economic efficiency.
A combined noise reduction method combining resistive and capacitive silencing is adopted. This is achieved by installing silencing plates in the wind tunnel walls and flow channels and optimizing the spatial layout of the silencing plates. This includes installing first wall silencing plates on the circumferential walls of the contraction and diffusion sections, flow channel silencing plates, adding a second wall silencing plate at the bottom, setting a third wall silencing plate on the inner side of the wind tunnel walls, installing flow channel silencing plates on the pre-embedded plates, and optimizing the airflow transition with guide plates.
It effectively suppressed noise leakage, improved the working environment, reduced noise interference to surrounding teaching areas, ensured the health and safety of experimental personnel, and reduced noise reduction costs.
Smart Images
Figure CN224151972U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind tunnel noise reduction technology, specifically to a noise reduction device for a large wind tunnel. Background Technology
[0002] Wind tunnels are essential equipment for studying physical phenomena such as aerodynamics and aeroacoustics, and for conducting related experiments. As a key facility for research and development in fields such as aerospace engineering and building construction, wind tunnel testing is increasingly being applied to the reliability verification of offshore platform structures with the development of marine resources. However, during testing, issues such as borehole wall noise, turbulent boundary layer noise, and wind turbine noise not only affect the accuracy of experimental data but also cause noise pollution to the working environment and surrounding residents.
[0003] Currently, most wind tunnel laboratories are located far from residential areas, with relatively low sound insulation requirements; some small wind tunnel laboratories, due to their limited scale and small number of fans, face less challenge in noise reduction design. However, for combined wind and wave laboratories located in teaching areas, characterized by large dimensions or multiple flow channels, noise reduction design presents significant challenges. How to achieve effective noise control while ensuring economic efficiency remains a key issue that needs to be addressed. Utility Model Content
[0004] The purpose of this invention is to provide a noise reduction device for a large wind tunnel, which can significantly reduce the noise generated during laboratory operation, thereby improving the internal working environment, reducing noise interference to the surrounding teaching areas, and ensuring the health and safety of laboratory personnel.
[0005] To achieve the above objectives, the technical solution of this application is as follows: a noise reduction device for a large wind tunnel, comprising a wind tunnel wall and a wind tunnel body; the wind tunnel wall encloses to form the wind tunnel body, which is located on a steel truss and includes a contraction section, a power section and a diffusion section connected in sequence; a plurality of first wall surface sound-absorbing plates are installed on the circumferential walls of the contraction section and the diffusion section; wall surface guide plates are fixedly connected to both ends of the first wall surface sound-absorbing plates; flow channel sound-absorbing plates are provided between adjacent first wall surface sound-absorbing plates; flow channel guide plates are fixedly connected to both ends of the flow channel sound-absorbing plates.
[0006] As a preferred embodiment of this utility model, the power section is equipped with a fan, and the bottom of the fan is connected to a support leg, which is fixed to the support leg plate of the steel truss.
[0007] As a preferred embodiment of this utility model, a second wall-mounted sound-absorbing plate is provided at the bottom of the contraction section and the diffusion section, and the second wall-mounted sound-absorbing plate is bolted to the steel truss.
[0008] As a preferred embodiment of this utility model, the inner surface of the wind tunnel wall is provided with a third wall sound-absorbing plate on both sides.
[0009] As a preferred embodiment of this utility model, a number of embedded plates are arranged in the contraction section and the diffusion section, and flow channel silencers are installed on the embedded plates along the flow channel area.
[0010] As a preferred embodiment of this utility model, the first wall sound-absorbing plate, the second wall sound-absorbing plate, and the third wall sound-absorbing plate have the same structure, each including a wall micro-perforated plate and an outer wall of the flow channel arranged in parallel, with a plurality of wall partition ribs between them. One side of the wall partition rib is welded to the wall micro-perforated plate by angle steel, and the other side is intermittently welded to the outer wall of the flow channel. Glass fiber cotton is filled between the wall micro-perforated plate and the outer wall of the flow channel, and the glass fiber cotton is interrupted by the wall partition ribs.
[0011] As a preferred embodiment of this utility model, the flow channel sound-absorbing plate includes a first flow channel microporous plate and a second flow channel microporous plate arranged in parallel, with a plurality of flow channel baffle ribs between them. One side of the flow channel baffle rib is welded to the first flow channel microporous plate by angle steel, and the other side is intermittently welded to the second flow channel microporous plate. Glass fiber cotton is filled between the first flow channel microporous plate and the second flow channel microporous plate, and the glass fiber cotton is interrupted by the flow channel baffle ribs.
[0012] As a preferred embodiment of this utility model, the wall guide plate includes a wall stiffener, a wall partition, and a wall skin. One end of the wall stiffener is connected to the wall skin by a bent angle steel, and the other end is connected to the wall partition, forming a single right-angled triangle. The sidewall of the wall stiffener is connected to the wind tunnel wall panel.
[0013] As a preferred embodiment of this utility model, the flow channel guide plate includes a flow channel stiffener, a flow channel partition, and a flow channel skin. The flow channel stiffener is laterally separated by the flow channel partition, and the outer ends of the separated flow channel stiffener are connected to the flow channel skin by bent angle steel, forming two right-angled triangles.
[0014] As a preferred embodiment of this utility model, the embedded plate adopts a layer-by-layer array layout.
[0015] This invention, by adopting the above technical solution, achieves the following technical effects: By dividing the wind tunnel into multiple independent flow channels, and employing a combined noise reduction method that integrates resistive and capacitive silencing in the walls and flow channels, while optimizing the spatial layout of the silencing plates, noise is effectively suppressed and noise reduction costs are significantly reduced. This solution solves the problem of noise leakage in large-size wind tunnel laboratories, avoids the impact of noise on the working environment and surrounding teaching areas, and ensures the health and safety of experimental personnel. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic elevation view of the noise reduction device for a large wind tunnel according to this utility model.
[0018] Figure 2 This is a schematic diagram of the noise reduction device for a large wind tunnel according to this utility model.
[0019] Figure 3 This is a partially enlarged schematic diagram of the wall-mounted sound-absorbing panel structure of this utility model;
[0020] Figure 4 This is a partially enlarged schematic diagram of the flow channel sound-absorbing plate structure of this utility model;
[0021] Figure 5 This is a partially enlarged schematic diagram of the wall-mounted flow guide plate structure of this utility model;
[0022] Figure 6 This is a partially enlarged schematic diagram of the flow channel guide plate structure of this utility model;
[0023] Explanation of the numbers in the diagram: 1. Wind tunnel wall; 11. Embedded plate; 12. Third wall silencer plate; 13. Flow channel silencer plate; 14. Flow channel guide plate; 2. Wind tunnel main body; 21. Contraction section; 22. Power section; 23. Diffusion section; 24. First wall silencer plate; 25. Wall guide plate; 3. Steel truss; 31. Leg support plate; 32. Fan; 33. Bolt; 34. Second wall 4. Sound-absorbing plate; 5. Wall stiffener plate; 6. Wall microporous plate; 7. Outer wall of flow channel; 8. Angle steel; 9. Fiberglass wool; 10. First flow channel microporous plate; 11. Second flow channel microporous plate; 12. Flow channel baffle rib; 13. Wall baffle; 24. Wall skin; 35. Bent angle steel; 46. Wall stiffener plate; 57. Flow channel stiffener plate; 68. Flow channel skin; 79. Flow channel baffle. Detailed Implementation
[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this application, "multiple" means two or more, unless otherwise expressly specified. "Several" means one or more, unless otherwise expressly specified.
[0027] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0029] Reference Figures 1-2 This embodiment provides a noise reduction device for a large wind tunnel, including a wind tunnel body enclosed by concrete wind tunnel walls. The wind tunnel body is stably supported on a steel truss and is composed of an aerodynamically optimized contraction section, a power section, and a diffusion section connected in sequence. Several first wall-mounted sound-absorbing plates are installed on the circumferential walls of the contraction and diffusion sections. Each sound-absorbing plate has a wall-mounted guide plate fixedly connected to both ends. Flow channel sound-absorbing plates and matching flow channel guide plates are provided between adjacent first wall-mounted sound-absorbing plates to improve the uniformity of the flow field and reduce the impact force on the walls.
[0030] The preferred solution includes: several embedded plates are arranged on the west wall of the contraction section and the diffusion section in a layer-by-layer array layout, and flow channel sound-absorbing plates are installed on the embedded plates, which can absorb local noise in the flow channel in multiple ways, thereby further reducing the noise.
[0031] The power section is equipped with a high-performance fan, whose bottom is firmly fixed to the support plate of the steel truss by support legs, effectively reducing vibration and noise;
[0032] A second wall-mounted sound-absorbing plate is added to the bottom of the contraction and diffusion sections and reliably connected to the steel truss by anti-loosening bolts to enhance the noise reduction effect at the bottom; a third wall-mounted sound-absorbing plate is symmetrically installed on the south and north walls of the wind tunnel to provide wall-mounted sound absorption and wall-mounted sound insulation for overall noise in the wind tunnel laboratory.
[0033] The contraction and diffusion sections adopt an array-type embedded plate layout, which provides a modular installation foundation for the flow channel silencer plate, making maintenance and replacement convenient.
[0034] Reference Figures 3-4 The sound-absorbing panels adopt an advanced composite structure: the wall sound-absorbing panels consist of high-sound-absorbing microporous plates arranged parallel to the outer wall of the flow channel, separated by spaced wall baffles and filled with ultra-fine glass fiber cotton to achieve wide-band sound absorption; the flow channel sound-absorbing panels adopt a double-layer flow channel microporous plate structure design, with flow channel baffles and ultra-fine glass fiber cotton in the middle, and each microporous plate and ultra-fine glass fiber cotton are separated by high-density glass fiber cloth to prevent the glass fiber cotton from flying out.
[0035] Reference Figures 5-6 Optimized design of the airflow guiding structure: The wall guide plate is a single right-angled triangle structure, which is connected to the high-strength wall skin and the baffle by the wall stiffener to ensure a smooth airflow transition; the flow channel guide plate adopts a double right-angled triangle structure, which is connected to the streamlined skin after the stiffener is separated by the flow channel baffle, effectively reducing airflow separation and secondary noise.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A noise reduction device for a large wind tunnel, comprising a wind tunnel wall and a wind tunnel body; the wind tunnel wall enclosing the wind tunnel body, characterized in that, The main body of the wind tunnel is located on a steel truss and includes a contraction section, a power section and a diffusion section connected in sequence. Several first wall silencing plates are installed on the circumferential walls of the contraction section and the diffusion section. The two ends of the first wall silencing plates are fixedly connected to wall guide plates. Flow channel silencing plates are provided between adjacent first wall silencing plates. Flow channel guide plates are fixedly connected to the two ends of the flow channel silencing plates.
2. The noise reduction device for a large wind tunnel according to claim 1, wherein The power section is equipped with a fan, and the bottom of the fan is connected to a support leg. The support legs are all fixed to the support leg plate of the steel truss.
3. The noise reduction device for a large wind tunnel according to claim 1, wherein A second wall silencing plate is provided at the bottom of the contraction section and the diffusion section, and the second wall silencing plate is bolted to the steel truss.
4. The noise reduction device of a large wind tunnel according to claim 3, wherein The wind tunnel wall has a third wall sound-absorbing plate on both sides of the inner surface.
5. The noise reduction apparatus of a large wind tunnel according to claim 1, wherein Several embedded plates are arranged in the contraction section and the diffusion section, and flow channel silencers are installed on the embedded plates along the flow channel area.
6. The noise reduction device for a large wind tunnel according to claim 4, characterized in that, The first, second, and third wall-mounted sound-absorbing panels have the same structure, each including a wall microporous plate and an outer wall of the flow channel arranged in parallel, with several wall partition ribs between them. One side of each wall partition rib is welded to the wall microporous plate by angle steel, and the other side is intermittently welded to the outer wall of the flow channel. Glass fiber cotton is filled between the wall microporous plate and the outer wall of the flow channel, and the glass fiber cotton is interrupted by the wall partition ribs.
7. The noise reduction apparatus of a large wind tunnel according to claim 1, wherein The flow channel sound-absorbing plate includes a first flow channel microporous plate and a second flow channel microporous plate arranged in parallel, with a number of flow channel baffle ribs between them. One side of the flow channel baffle rib is welded to the first flow channel microporous plate by angle steel, and the other side is intermittently welded to the second flow channel microporous plate. Glass fiber cotton is filled between the first flow channel microporous plate and the second flow channel microporous plate, and the glass fiber cotton is interrupted by the flow channel baffle ribs.
8. The noise reduction apparatus of a large wind tunnel according to claim 1, wherein The wall guide plate includes a wall stiffener, a wall partition, and a wall skin. One end of the wall stiffener is connected to the wall skin by a bent angle steel, and the other end is connected to the wall partition, forming a single right-angled triangle. The sidewall of the wall stiffener is connected to the wind tunnel wall panel.
9. The noise reduction apparatus of a large wind tunnel according to claim 1, wherein The flow channel guide plate includes flow channel stiffeners, flow channel partitions, and flow channel skin. The flow channel stiffeners are laterally separated by the flow channel partitions. The outer ends of the separated flow channel stiffeners are connected to the flow channel skin by bent angle steel, forming two right-angled triangles.
10. The noise reduction apparatus of a large wind tunnel according to claim 5, wherein The embedded plates are arranged in a layer-by-layer array.