Spiral spanwise modal controller

Abstract

The invention discloses a spiral spanwise mode controller, and relates to the technical field of fluid dynamics and vibration control, and the spiral spanwise mode controller comprises a spiral micro-rib structure which is used for being arranged on the surface of an application main body, and the spiral micro-rib structure is spirally arranged around the application main body for at least one circle; and an included angle is formed between the spiral micro-rib structure and incoming flow. According to the spiral spanwise mode controller, aerodynamic noise and vibration generated by an application main body structure in the fluid streaming process can be effectively restrained, and meanwhile negative effects on aerodynamic characteristics of an application main body are reduced as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid dynamics and vibration control, and in particular to a spiral spanwise modal controller suitable for vibration and noise control of an application subject (such as an aircraft wing, a wind turbine blade, etc.) in a high-speed fluid. Background Art

[0002] When high-speed fluid flows around an application body, such as an aircraft wing, a wind turbine blade, or a high-speed train body, vibration and noise problems are often induced due to spanwise modes. These problems not only affect the performance and life of the structure, but may also cause interference to the surrounding environment. Traditional control methods often have limited effectiveness and may increase the weight and cost of the structure. Therefore, it is particularly important to develop new control technologies to suppress these adverse effects. Summary of the invention

[0003] The purpose of the present invention is to provide a spiral spanwise modal controller to solve the problems existing in the above-mentioned prior art, which can effectively suppress the aerodynamic noise and vibration generated by the application subject structure during the fluid flow process, while minimizing the negative impact on the aerodynamic characteristics of the application subject.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a spiral spanwise modal controller, comprising: a spiral micro-rib structure, which is used to be arranged on the surface of an application body, and is at least spirally arranged around the application body for one circle, and has an angle with the incoming flow.

[0006] Preferably, the angle θ between the spiral micro-rib structure and the incoming flow is 10°-45°.

[0007] Preferably, the height h of the spiral micro-rib structure is:

[0008] h=C h ·L c ·Re -n

[0009] Among them, C h is a dimensionless constant, 0.1≤C h ≤10; L c is the chord length of the application body; R e is the Reynolds number; n is the exponent, n=0.5.

[0010] Preferably, the height d of the spiral micro-rib structure is:

[0011] d=C d ·h

[0012] Among them, C d is the width coefficient, 0.2≤C d ≤1.

[0013] Preferably, the distance W between adjacent turns of the spiral micro-rib structures is:

[0014] W=C W ·h

[0015] Among them, C W is the spacing factor, 50≤C W ≤100.

[0016] Preferably, the cross-section of the spiral micro-rib structure is rectangular, triangular or trapezoidal.

[0017] Preferably, the distances between adjacent turns of the spiral micro-rib structures are the same or different.

[0018] Preferably, the spiral micro-rib structure is made of composite material or metal material.

[0019] Preferably, the surface of the spiral micro-rib structure is provided with a coating or a texture.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The spiral spanwise modal controller of the present invention suppresses vibration and noise by arranging a series of spiral micro-rib structures on the surface of the application body. The spiral micro-rib structure is at a certain angle to the incoming flow, and can destroy the consistency of the flow field in the spanwise direction of the application body through small disturbances, weaken the coherence of the vortex structure along the spanwise direction of the application body, thereby effectively suppressing the vibration and noise of the object induced by the spanwise mode. The potential application of the spiral spanwise modal controller of the present invention is very wide, including but not limited to aerospace, wind power generation, high-speed trains and other fields. By applying this technology to key components, the stability and performance of the system can be significantly improved, while reducing noise pollution to the environment, which has important practical significance and broad market prospects. In addition, the design and preparation method of the spiral spanwise modal controller is simple, easy to implement, and will not significantly increase the weight and cost of the structure, which makes the technology have high practical value and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of a spiral spanwise modal controller of the present invention;

[0024] Figure 2 Schematic diagram of various parameters of the spiral spanwise modal controller of the present invention;

[0025] Figure 3 Schematic diagram of the cross section of the spiral micro-rib structure of the present invention (triangular cross section);

[0026] Figure 4 Schematic diagram of the cross section of the spiral micro-rib structure of the present invention (rectangular cross section);

[0027] In the figure: 1- spiral micro-rib structure, 2- application body. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The purpose of the present invention is to provide a spiral spanwise modal controller to solve the problems existing in the above-mentioned prior art, which can effectively suppress the aerodynamic noise and vibration generated by the application subject structure during the fluid flow process, while minimizing the negative impact on the aerodynamic characteristics of the application subject.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1 to 4 As shown, this embodiment provides a spiral spanwise modal controller for solving the vibration and noise problems induced by the spanwise mode of the application body 2 during the high-speed fluid flow, including: a spiral micro-rib structure 1, the spiral micro-rib structure 1 is used to be arranged on the surface of the application body 2, the spiral micro-rib structure 1 is at least spirally arranged around the application body 2, and there is an angle between the spiral micro-rib structure 1 and the incoming flow. Through the interaction between the spiral micro-rib structure 1 and the flow field, tiny disturbances are generated, which effectively destroy the consistency of the spanwise flow field, thereby weakening the coherence of the vortex structure of the application body 2 along the spanwise direction, and suppressing the vibration and noise induced by the spanwise mode. By arranging the spiral spanwise modal controller of this embodiment on the surface of the application body 2, this embodiment can adjust the fluid dynamic characteristics, change and suppress the spanwise mode, and significantly reduce the spanwise modal induced vibration and noise excited by the fluid dynamics.

[0032] Specifically, in this embodiment, the arrangement area of ​​the spiral spanwise modal controller on the surface of the application body 2 needs to be precisely adjusted according to the specific application of the application body 2 and the main vibration and noise generation area. Generally, the spiral spanwise modal controller is arranged in an area closely related to the generation of vibration and noise to achieve the best suppression effect, which can ensure that the effect of the spiral spanwise modal controller is maximized while avoiding unnecessary interference to irrelevant areas.

[0033] In this embodiment, the angle θ between the spiral micro-rib structure 1 and the incoming flow is 10°-45° to balance flow control and resistance. The angle between the spiral micro-rib structure 1 and the incoming flow takes into account the dynamic characteristics of the flow field and the geometric characteristics of the application body 2. By appropriately selecting the angle θ (usually between 10° and 45°), the turbulent transition of the boundary layer can be effectively controlled, the trailing edge noise can be suppressed, and the flow separation can be reduced. At the same time, the design of the angle θ should comprehensively consider the influence of aerodynamic drag to find the best balance between performance optimization and noise control. The design and optimization of this angle can significantly improve the overall efficiency of the aerodynamic structure and is suitable for a variety of application scenarios of modern aircraft, including the needs of high-speed aircraft and low-noise design. The angle between each spiral micro-rib structure 1 and the incoming flow is flexibly designed. The angle between each spiral micro-rib structure 1 and the incoming flow can be the same. The angle between each spiral micro-rib structure 1 and the incoming flow can also change according to the position change of the surface of the application body 2, so that the spiral micro-rib structure 1 can adapt to different flow field conditions to optimize the vibration and noise suppression effect.

[0034] In this embodiment, the cross-sectional shape of the spiral micro-rib structure 1 is selected based on considerations of flow field disturbance effects and manufacturing processes. The cross-sectional shape of the spiral micro-rib structure 1 is rectangular, triangular or trapezoidal, and other shapes may also be used to adapt to different fluid dynamics requirements and structural strength requirements, and to change the fluid dynamics characteristics.

[0035] In this embodiment, the height h of the spiral micro-rib structure 1 is:

[0036] h=C h ·L c ·Re -n

[0037] Among them, C h is a dimensionless constant, 0.1≤C h ≤10; L c is the chord length of the application body 2; R e is the Reynolds number, U ∞is the incoming flow velocity, ρ is the density of the incoming flow, μ is the viscosity coefficient of the incoming flow; n is an exponent, n = 0.5. The height h of the spiral micro-rib structure 1 is inversely proportional to the chord length and Reynolds number of the application body 2 to ensure that the boundary layer characteristics can be effectively controlled under different flow conditions. Its typical expression is:

[0038] h=C h ·L c ·Re -n

[0039] That is, h is inversely proportional to the square root of the Reynolds number.

[0040] Therefore, the height h of the spiral micro-rib structure 1 is expressed as:

[0041] h=C h ·L c ·Re -0.5

[0042] In this embodiment, the height h of the spiral micro-rib structure 1 (the distance between the cross-section vertex and the surface of the application body 2) is preferably 2 mm-3 mm to ensure its effective disturbance to the flow field without excessively increasing the resistance.

[0043] In this embodiment, the distance W between adjacent circles of the spiral micro-rib structure 1 is the same or the distance W between adjacent circles of the spiral micro-rib structure 1 is different. The spacing design of adjacent circles of the spiral micro-rib structure 1 along the span direction is also flexible, which can be kept consistent or changed according to the specific needs and flow field characteristics of the application subject 2. The variable spacing design can more finely control the flow field to adapt to complex or changing fluid environments (different flow velocities and pressure distributions), thereby improving the efficiency of vibration and noise suppression.

[0044] The distance W between adjacent turns of the spiral micro-rib structure 1 is:

[0045] W=C W ·h

[0046] The distance W between adjacent turns of the spiral micro-rib structure 1 can be written as:

[0047] W=C W ·C h ·L c ·Re -0.5

[0048] Among them, C W is the spacing factor, 50≤C W ≤100.

[0049] The width of the spiral micro-rib structure 1 is d, and the height d of the spiral micro-rib structure 1 is:

[0050] d=Cd ·h

[0051] The width d of the spiral micro-rib structure 1 can be written as:

[0052] d=C d ·C h ·L c ·Re -0.5

[0053] Among them, C d is the width coefficient, 0.2≤C d ≤1.

[0054] The selection of the material and the consideration of the surface treatment of the spiral micro-rib structure 1 can ensure the durability of the spiral micro-rib structure 1 and the compatibility with the surface of the application body 2. In this embodiment, the spiral micro-rib structure 1 is made of a lightweight and high-strength composite material or metal material; the surface treatment includes providing a coating or texture on the surface of the spiral micro-rib structure 1 to enhance its corrosion resistance and durability.

[0055] When designing the spiral spanwise modal controller of this embodiment, a detailed analysis of the fluid dynamics and structural dynamics of the application body 2 is performed to ensure that the arrangement and design of the vortex generator can achieve the expected vibration and noise suppression effect, and will not have a negative impact on the overall performance of the application body 2. The spiral spanwise modal controller ensures that the disturbances generated by the flow field can be effectively suppressed through the geometric shape, size and distribution of the spiral micro-rib structure 1. The spiral spanwise modal controller can effectively suppress the vibration and noise induced by the spanwise mode, while having almost no effect on the average aerodynamic performance. In addition, the spiral spanwise modal controller of this embodiment is highly feasible in engineering applications. The structural arrangement of the spiral spanwise modal controller of this embodiment is not only easy to implement, but also can be flexibly adapted to different shapes and sizes of the application body 2, making it a universal and efficient solution. This embodiment has important practical significance and broad market prospects.

[0056] The spiral spanwise modal controller of this embodiment has the following advantages:

[0057] 1. Efficient noise reduction: By arranging a spiral spanwise modal controller, the coherence of the noise of the application subject 2 along the spanwise direction can be significantly destroyed, thereby achieving a significant noise reduction effect. This noise reduction technology has a wide range of application scenarios, including aerospace, wind power generation, high-speed trains, etc.

[0058] 2. Small impact on aerodynamic characteristics: The design and layout of the spiral spanwise modal controller have been carefully optimized to ensure that the disturbance to the flow field is minimized and has almost no impact on the aerodynamic characteristics of the application subject 2, while improving comfort and safety without sacrificing performance;

[0059] 3. Lightweight design: The design of the spiral spanwise modal controller takes into account the increase in weight, ensuring that the overall weight of the application subject 2 is minimally affected while achieving noise and vibration reduction effects;

[0060] 4. Convenient engineering implementation: The design and manufacturing process of the spiral spanwise modal controller is simple, easy to implement, and cost-effective, making the present invention not only effective in theory, but also highly feasible in practical engineering applications;

[0061] V. Adjustability: The adjustability of the layout area, shape and parameters provides the present invention with a high degree of flexibility, enabling it to adapt to application subject 2 structures of different types and sizes, as well as different working environments and requirements.

[0062] In summary, the spiral spanwise modal controller of the present invention provides an innovative and effective solution for controlling aerodynamic noise and vibration of the application body 2 structure, and has significant practical value and broad application prospects.

[0063] Application examples:

[0064] The spiral spanwise modal controller is used to suppress the trailing edge noise of the 2.SD symmetrical airfoil. Specifically, multiple spiral micro-rib structures 1 are arranged at equal intervals on the surface of both sides of the airfoil. Assuming the incoming flow velocity is 50m / s and the chord length L c =2m, Reynolds number is The height of the spiral micro-rib structure 1 is about h = C h ·L c ·Re -0.5 =3×2×(6.77×10 6 ) -0.5 ≈0.0023m(where C h Take 3) to reduce the impact on aerodynamic characteristics. The spiral micro-rib structure 1 is arranged at equal intervals along the span direction, with a spacing of W = C W ·h=80×2.3mm≈0.2m(C W =80), the angle between the arrangement direction and the incoming flow is constant at θ=30°, and the cross-sectional shapes are triangle and rectangle respectively.

[0065] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A spiral spanwise modal controller, characterized in that: include: A spiral micro-rib structure is used to be arranged on the surface of the application body. The spiral micro-rib structure is at least spirally arranged around the application body for one circle, and an angle is formed between the spiral micro-rib structure and the incoming flow.

2. The spiral spanwise modal controller according to claim 1, characterized in that: The angle θ between the spiral micro-rib structure and the incoming flow is 10°-45°.

3. The spiral spanwise modal controller according to claim 1, characterized in that: The height h of the spiral micro-rib structure is: h=C h ·L c ·Re -n Among them, C h is a dimensionless constant, 0.1≤C h ≤10; L c is the chord length of the application body; R e is the Reynolds number; n is the exponent, n=0.

5.

4. The spiral spanwise modal controller according to claim 3, characterized in that: The height d of the spiral micro-rib structure is: d=C d ·h Among them, C d is the width coefficient, 0.2≤Cd≤1.

5. The spiral spanwise modal controller according to claim 3, characterized in that: The distance W between adjacent turns of the spiral micro-rib structure is: W=C W ·h Among them, C W is the spacing factor, 50≤C W ≤100.

6. The spiral spanwise modal controller according to claim 1, characterized in that: The cross section of the spiral micro-rib structure is rectangular, triangular or trapezoidal.

7. The spiral spanwise mode controller according to claim 1, characterized in that: The distances between adjacent coils of the spiral micro-rib structures are the same or different.

8. The spiral spanwise mode controller according to claim 1, characterized in that: The spiral micro-rib structure is made of composite material or metal material.

9. The spiral spanwise mode controller according to claim 1, characterized in that: The surface of the spiral micro-rib structure is provided with a coating or a texture.

Images