A spiral spanwise modal controller

Abstract

This invention discloses a helical spanwise modal controller, relating to the fields of fluid dynamics and vibration control technology. It includes a helical microrib structure disposed on the surface of an application body, the helical microrib structure being arranged at least one turn around the application body, and the helical microrib structure having an angle with the incoming flow. The helical spanwise modal controller of this invention can effectively suppress aerodynamic noise and vibration generated by the application body structure during fluid flow, while minimizing the negative impact on the aerodynamic characteristics of the application body.

Description

Technical Field

[0001] This invention relates to the fields of fluid dynamics and vibration control technology, and in particular to a helical spanwise modal controller suitable for vibration and noise control of main components (such as aircraft wings, wind turbine blades, etc.) in high-speed fluids. Background Technology

[0002] In applications involving high-speed fluid flow, such as aircraft wings, wind turbine blades, or high-speed train bodies, spanwise modes often induce vibration and noise problems. These issues not only affect the structure's performance and lifespan but can also disrupt the surrounding environment. Traditional control methods often have limited effectiveness and may increase the structure's weight and cost. Therefore, developing novel control technologies to mitigate these adverse effects is of paramount importance. Summary of the Invention

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

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] The present invention provides a spiral spanwise modal controller, comprising: a spiral microrib structure, the spiral microrib structure being disposed on the surface of an application body, the spiral microrib structure being spirally disposed at least once around the application body, and the spiral microrib structure having an angle with the incoming flow.

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

[0007] Preferably, the height h of the spiral microrib structure is:

[0008] h = C h ·L c ·Re -n

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

[0010] Preferably, the height d of the spiral microrib structure is:

[0011] d=C d ·h

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

[0013] Preferably, the distance W between adjacent spiral microrib structures is:

[0014] W=C W ·h

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

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

[0017] Preferably, the distances between adjacent spiral microrib structures are the same or different.

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

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

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] The spiral spanwise modal controller of this invention suppresses vibration and noise by arranging a series of spiral microrib structures on the surface of the application body. The spiral microrib structures are at a certain angle to the incoming flow, and can disrupt the consistency of the flow field along the spanwise direction of the application body through minute disturbances, weakening the coherence of the vortex structure along the spanwise direction of the application body, thereby effectively suppressing spanwise mode-induced vibration and noise. The potential applications of the spiral spanwise modal controller of this invention are very broad, including but not limited to aerospace, wind power generation, and high-speed trains. 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 significant practical value and broad market prospects. Furthermore, the design and fabrication method of the spiral spanwise modal controller is simple and easy to implement, and does not significantly increase the weight and cost of the structure, making this technology highly practical and economical. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0024] Figure 2 This is a schematic diagram of the parameters of the spiral spanwise modal controller of the present invention;

[0025] Figure 3 This is a schematic diagram (triangular section) of the spiral microrib structure of the present invention;

[0026] Figure 4 This is a schematic cross-sectional view (rectangular section) of the spiral microrib structure of the present invention;

[0027] In the figure: 1-spiral microrib structure, 2-application subject. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

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

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be 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 helical spanwise modal controller to address the vibration and noise problems induced by spanwise modes in the application body 2 during high-speed fluid flow. It includes a helical microrib structure 1, which is disposed on the surface of the application body 2. The helical microrib structure 1 is arranged at least once around the application body 2, and has an angle with the incoming flow. The interaction between the helical microrib structure 1 and the flow field generates minute disturbances, effectively disrupting 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 vibration and noise induced by spanwise modes. By arranging the helical spanwise modal controller of this embodiment on the surface of the application body 2, the hydrodynamic characteristics can be adjusted, the spanwise modes can be changed and suppressed, and the vibration and noise induced by the hydrodynamically excited spanwise modes can be significantly reduced.

[0032] Specifically, in this embodiment, the arrangement area of ​​the helical spanwise modal controller on the surface of the application subject 2 needs to be precisely adjusted according to the specific application of the application subject 2 and the main areas where vibration and noise are generated. Typically, the helical spanwise modal controller is placed in areas closely related to vibration and noise generation to achieve optimal suppression, ensuring maximum effectiveness of the helical spanwise modal controller while avoiding unnecessary interference with unrelated areas.

[0033] In this embodiment, the angle θ between the helical microrib structure 1 and the incoming flow is 10°-45° to balance flow control and drag. The angle between the helical microrib structure 1 and the incoming flow takes into account the dynamic characteristics of the flow field and the geometric features 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, trailing edge noise can be suppressed, and 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 optimal balance between performance optimization and noise control. This angle design and optimization can significantly improve the overall efficiency of the aerodynamic structure and is suitable for various application scenarios of modern aircraft, including the requirements of high-speed aircraft and low-noise design. The angle design between each helical microrib structure 1 and the incoming flow is flexible. The angle between each helical microrib structure 1 and the incoming flow can be the same, or the angle between each helical microrib structure 1 and the incoming flow can vary according to the position of the surface of the application body 2, so that the helical microrib structure 1 can adapt to different flow field conditions to optimize the suppression effect of vibration and noise.

[0034] In this embodiment, the selection of the cross-sectional shape of the spiral microrib structure 1 is based on considerations of the flow field disturbance effect and manufacturing process. The cross-section of the spiral microrib structure 1 is rectangular, triangular or trapezoidal, and other shapes can also be used to adapt to different fluid dynamics requirements and structural strength requirements, in order to change the fluid dynamics characteristics.

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

[0036] h = C h ·L c ·Re -n

[0037] Among them, C h It is a dimensionless constant, 0.1≤C h ≤10; L c R is the chord length of application subject 2; e Let Reynolds number be 1. U ∞Let ρ be the incoming flow velocity, ρ be the incoming flow density, and μ be the incoming flow viscosity coefficient; n is the exponent, n = 0.5. The height h of the spiral microrib structure 1 is inversely proportional to the chord length and Reynolds number of the application body 2 to ensure effective control of boundary layer characteristics 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 expression for the height h of the spiral microrib structure 1 is:

[0041] h = C h ·L c ·Re -0.5

[0042] In this embodiment, the height h (distance from the vertex of the cross section to the surface of the application body 2) of the spiral microrib structure 1 is preferably 2mm-3mm to ensure that it effectively disturbs the flow field without excessively increasing the resistance.

[0043] In this embodiment, the distance W between adjacent spiral microrib structures 1 is the same or different. The spacing of adjacent spiral microrib structures 1 along the spanwise direction is also flexible; it can remain consistent or vary according to the specific needs and flow field characteristics of the application subject 2. Variable spacing allows for more precise control of 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 spiral microrib structures 1 is:

[0045] W=C W ·h

[0046] The distance W between adjacent spiral microrib structures 1 can be written as:

[0047] W=C W ·C h ·L c ·Re -0.5

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

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

[0050] d=Cd ·h

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

[0052] d=C d ·C h ·L c ·Re -0.5

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

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

[0055] In this embodiment, the helical spanwise modal controller undergoes detailed fluid dynamics and structural dynamics analysis of the application body 2 during design to ensure that the arrangement and design of the vortex generator achieve the expected vibration and noise suppression effects without negatively impacting the overall performance of the application body 2. The helical spanwise modal controller effectively suppresses flow field disturbances through the geometry, size, and distribution of the helical microrib structure 1. It effectively suppresses vibrations and noise induced by spanwise modes while having almost no impact on mean aerodynamic performance. Furthermore, this embodiment's helical spanwise modal controller is highly feasible for engineering applications. The structural arrangement of this embodiment's helical spanwise modal controller is not only easy to implement but also flexibly adaptable to different shapes and sizes of the application body 2, making it a universal and efficient solution. This embodiment has significant practical implications and broad market prospects.

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

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

[0058] 2. Minimal 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 main body of application 2. While improving comfort and safety, performance is not sacrificed.

[0059] III. Lightweight Design: The design of the spiral spanwise modal controller takes into account the increase in weight, ensuring that while achieving noise reduction and vibration damping effects, the impact on the overall weight of the main application 2 is minimized;

[0060] IV. 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 theoretically effective 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 different types and sizes of application body 2 structures, 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 the aerodynamic noise and vibration control of the main body 2 structure, and has significant practical value and broad application prospects.

[0063] Application example:

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

[0065] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A spiral spanwise modal controller, characterized in that: include: A spiral microrib structure is provided on the surface of the application body. The spiral microrib structure is arranged at least once around the application body and has an angle with the incoming flow. The angle θ between the spiral microrib structure and the incoming flow is 10°-45°; the angle between each spiral microrib structure and the incoming flow is the same, or the angle between each spiral microrib structure and the incoming flow varies according to the position of the application body surface. The height of the spiral microrib structure for: in, It is a dimensionless constant. ; The chord length of the main application subject; It is the Reynolds number; For index, ; The width of the spiral microrib structure for: in, It is the width factor. ; The distance between the spiral microrib structures of adjacent loops for: in, It is the spacing coefficient. .

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

3. The spiral spanwise modal controller according to claim 1, characterized in that: The distances between adjacent spiral microrib structures may be the same or different.

4. The spiral spanwise modal controller according to claim 1, characterized in that: The spiral microrib structure is made of composite materials or metal materials.

5. The spiral spanwise modal controller according to claim 1, characterized in that: The surface of the spiral microrib structure is coated or textured.

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