Bulkhead double-side breakwater structure applied to sloshing suppression of rectangular liquid tank

Abstract

The utility model provides a bulkhead double-side breakwater structure applied to sloshing suppression of a rectangular liquid tank, and relates to the technical field of ship and ocean engineering fluid dynamics, the bulkhead double-side breakwater structure comprises a breakwater assembly, the breakwater assembly comprises a left arc-shaped breakwater and a right arc-shaped breakwater which are arranged in a liquid tank body, bulkheads are arranged on the two sides of the liquid tank body, and the bulkheads are arranged on the two sides of the liquid tank body. The left arc-shaped breakwater and the right arc-shaped breakwater are tightly fixed to the inner sides of the two side bulkheads respectively, the bottoms of the left arc-shaped breakwater and the right arc-shaped breakwater are connected with the liquid tank bottom face of the liquid tank body in an attached mode, and the tops of the left arc-shaped breakwater and the right arc-shaped breakwater are lower than the liquid tank top of the liquid tank body. The left arc-shaped breakwater and the right arc-shaped breakwater are arc-shaped, arc-shaped inclined side edges are arranged on the sides, away from the bulkhead, of the left arc-shaped breakwater and the right arc-shaped breakwater, and a plurality of rectangular holes are evenly formed in the inclined side edges. According to the utility model, the liquid sloshing amplitude and impact energy can be obviously reduced, and the problems of low sloshing suppression efficiency and poor structural adaptability of the liquid tank in the prior art are solved.

Description

Technical Field

[0001] This utility model relates to the field of fluid dynamics technology in shipbuilding and marine engineering, and in particular to a double-sided breakwater structure for suppressing sloshing in rectangular liquid tanks. Background Technology

[0002] In scenarios such as ships, offshore liquid storage tanks, or liquefied natural gas (LNG) transport tanks, the sloshing phenomenon of liquids on free surfaces can cause severe impact loads, structural fatigue, and stability problems. Especially under partial loading conditions (such as when the water depth in the tank is 30% of its height), the low-frequency, large-amplitude sloshing effect is significant and can cause destructive impacts on the tank walls. Traditional methods for suppressing sloshing include installing horizontal bulkheads, vertical baffles, or damping structures. However, horizontal bulkheads significantly reduce the effective tank volume, vertical baffles are insufficient in suppressing the dominant sloshing energy, and damping structures suffer from design complexity and high maintenance costs. Existing breakwater structures within liquid tanks often employ a single-sided arrangement or are insufficient in height. For example, a single-sided breakwater can only reflect a portion of the wave energy, leading to asymmetric impact loads; while breakwaters less than 50% of the tank height cannot cover the main energy area of ​​liquid sloshing, and the suppression effect decreases sharply with increasing external excitation. Therefore, how to achieve efficient, low-cost, and space-saving liquid tank sloshing suppression through structural optimization is a pressing technical challenge in this field. Utility Model Content

[0003] To address the technical problems of low sloshing suppression efficiency and poor structural adaptability in existing liquid tank technologies, this invention provides a double-sided breakwater structure for suppressing sloshing in rectangular liquid tanks. This invention utilizes symmetrically arranged arc-shaped breakwaters, each 60% of the tank height, on both sides of the liquid tank to cover the concentrated area of ​​liquid sloshing energy. Perforations are made in these breakwaters, and the gradual energy dissipation characteristics of the double-sided reflection and the arc-shaped breakwaters significantly reduce sloshing amplitude and impact load. Furthermore, this structure can be directly integrated into the tank wall without occupying internal space, and through parametric design, it can adapt to different liquid tank sizes and loading conditions, solving the problems of low sloshing suppression efficiency and poor adaptability of traditional breakwaters. The technical means employed in this invention are as follows:

[0004] A double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank includes: a breakwater assembly, the breakwater assembly including a left arc-shaped breakwater and a right arc-shaped breakwater arranged inside the liquid tank body, wherein the liquid tank body has walls on both sides, the left arc-shaped breakwater and the right arc-shaped breakwater are respectively tightly attached to the inner side of the two side walls, the bottom of the left arc-shaped breakwater and the right arc-shaped breakwater are both attached to the bottom surface of the liquid tank body, and the top of the left arc-shaped breakwater and the right arc-shaped breakwater are both lower than the top of the liquid tank body;

[0005] Both the left and right arc-shaped breakwaters are arc-shaped, with an arc-shaped inclined side on the side away from the bulkhead, and multiple rectangular holes are evenly distributed on the inclined side.

[0006] Furthermore, the left and right arc-shaped breakwaters have the same structure and are arranged symmetrically.

[0007] Furthermore, the height of both the left and right arc-shaped breakwaters is 60% of the tank height, and the distance between the top of the left and right arc-shaped breakwaters and the top of the tank is 40% of the tank height.

[0008] Furthermore, the widths of the left and right arc-shaped breakwaters are both 5% of the width of the liquid tank body.

[0009] Furthermore, the left and right arc-shaped breakwaters are welded to the side bulkheads respectively, forming welded joints at the weld points.

[0010] Furthermore, the liquid tank body is a rectangular structure, which contains the liquid inside the tank, and the designed water depth of the liquid tank body is 30% of the tank height.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. Traditional breakwaters for liquid tanks are often single-sided or insufficiently high, resulting in ineffective dissipation of lateral liquid flow energy and difficulty in covering areas where sloshing energy is concentrated. This invention provides a double-sided breakwater structure for suppressing sloshing in rectangular liquid tanks. By symmetrically setting arc-shaped breakwaters with a height of 60% of the tank height on both sides of the tank and opening holes in them, it covers the main frequency energy zone of liquid surface sloshing. Through double-sided reflection and the gradual energy dissipation of the arc-shaped breakwaters, the sloshing amplitude is significantly increased, solving the problem of low efficiency in suppressing asymmetric impacts and low-frequency large-amplitude sloshing.

[0013] 2. The breakwater structure on both sides of the bulkhead for suppressing sloshing in rectangular liquid tanks provided by this utility model can be directly integrated into the bulkhead without occupying the effective volume inside the liquid tank. It can also be quickly installed and maintained through welding. By adapting to different liquid tank sizes and loading rates through a parametric design model, only the breakwater inclination angle or lateral width needs to be adjusted to balance the sloshing suppression efficiency and the requirement for lightweight structure. It is suitable for engineering renovation and new construction projects in scenarios such as ships and LNG storage tanks.

[0014] Based on the above reasons, this utility model can be widely promoted in fields such as liquid tank sloshing suppression. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the rectangular liquid tank and the arc-shaped breakwater of this utility model.

[0017] Figure 2 This is a schematic diagram of the rectangular liquid tank and the arc-shaped breakwater of this utility model.

[0018] Figure 3 This is a schematic diagram of the arc-shaped breakwater of this utility model.

[0019] Figure 4 These are three views of the arc-shaped breakwater of this utility model, where (a) is the front view, (b) is the side view, and (c) is the top view.

[0020] In the diagram: 1. Tank body; 2. Liquid inside the tank; 3. Left arc-shaped breakwater; 4. Right arc-shaped breakwater; 5. Tank wall; 6. Inclined side; 6A. Rectangular hole; 7. Welded joint; 8. Top of the tank; 9. Bottom of the tank. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] This invention provides a double-sided breakwater structure for suppressing sloshing in rectangular liquid tanks. It addresses the problems of low sloshing suppression efficiency and poor structural adaptability in existing technologies. Traditional breakwaters often employ a single-sided arrangement or are insufficiently high, resulting in ineffective dissipation of lateral liquid flow energy and difficulty in covering the concentrated sloshing energy area when the water depth is 30% of the tank height. Furthermore, existing breakwater structures are limited in form and lack adaptability to tank dimensions and loading conditions. This invention, through symmetrically arranged arc-shaped breakwaters of specific heights on both sides, combined with optimized geometric parameter design, significantly reduces the amplitude and impact energy of liquid sloshing.

[0023] This invention relates to a double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank. Integrated into the two side walls 5 of the liquid tank body 1, the breakwater, with its specific geometric shape, effectively suppresses free surface sloshing of the liquid 2 inside the tank, significantly reducing the sloshing amplitude and impact load on the walls 5. The method combines structural design and parametric modeling; the specific structural configuration is as follows... Figures 1 to 4 As shown. The breakwater structure of this utility model consists of a structural body assembly (breakwater assembly) and an installation structure (installation connection assembly) installed on the liquid tank body 1. The breakwater assembly includes two arc-shaped breakwaters symmetrically arranged on both sides of the tank body 1, with openings on them. The two arc-shaped breakwaters are the left arc-shaped breakwater 3 and the right arc-shaped breakwater 4. The left arc-shaped breakwater 3 and the right arc-shaped breakwater 4 are the core damping elements of this utility model. They have the same structure and are symmetrically arranged on the inner side of the tank body 1 on both sides of the tank body 1. The liquid tank body 1 is a regular rectangular structure, which contains liquid 2. The key geometric parameters of the liquid tank body 1 include the tank height, tank width, and tank length, with the design water depth being 30% of the tank height. The two arc-shaped breakwaters are both arc-shaped, and their height is set to 60% of the tank height. Their installation position, inclination angle, and spacing are optimized through a parametric design model to match the liquid tank water depth and external excitation conditions. The top of each of the two arc-shaped breakwaters is 40% of the tank height from the top 8 of the tank body 1, and the bottom of each is in contact with (fitted) the bottom surface 9 of the tank body 1. Each arc-shaped breakwater has an arc-shaped inclined side 6 (arc-shaped curved surface) on the side away from the tank wall 5, on which multiple rectangular holes 6A are evenly arranged to guide the flowing liquid to generate a progressive vortex flow and promote the dissipation of the liquid's lateral kinetic energy. The lateral width of both arc-shaped breakwaters is set to 5% of the tank width to balance the effective range of action and structural compactness.

[0024] The installation and connection components are used to securely integrate the breakwater structure into the tank bulkhead 5, mainly including welded joints 7 and a frame. The left-side arc-shaped breakwater 3 and the right-side arc-shaped breakwater 4 are rigidly connected by continuous welded joints 7 distributed along their contact edges with the bulkhead 5. That is, the left-side arc-shaped breakwater 3 and the right-side arc-shaped breakwater 4 are welded to the two sides of the bulkhead 5 respectively, forming welded joints 7. The welding method and weld size are selected based on the thickness, strength, and expected load of the bulkhead 5 material to ensure reliable connection and withstand the impact of liquid sloshing.

[0025] The purpose of this invention is achieved as follows: Two independent arc-shaped breakwaters are symmetrically installed on both sides of the tank body 1, with the height of the arc-shaped breakwaters being 60% of the tank height, the top being 840% of the top of the tank, and the bottom extending to the bottom surface 9 of the tank. The arc-shaped breakwaters are fixed perpendicular to the tank wall 5, and their arc-shaped inclined sides 6 guide the dissipation of liquid energy. The width of the arc-shaped breakwaters is 5% of the tank width, and they are rigidly connected to the tank wall 5 by welding. The installation position and geometric dimensions of the breakwaters are calculated through a parametric design model to ensure that they cover the area where the sloshing energy of the tank is concentrated. The lateral width of the breakwaters can be adjusted according to actual requirements and the length-to-width ratio of the tank, or the thickness of the breakwaters can be increased to adapt to high-intensity impact environments.

[0026] This utility model's breakwater structure can be designed using existing methods. These methods involve setting breakwater structures of specific heights on both sides of a rectangular liquid tank (5) to suppress the tank's sloshing effect and reduce liquid impact loads. The design method includes calculating the breakwater's geometric parameters, simulating and verifying the fluid energy suppression effect, and analyzing its installation compatibility.

[0027] The design method is based on the principle of sloshing energy concentration in the liquid tank wall 5 region and vortex dissipation. The core of this method lies in symmetrically arranging two arc-shaped breakwaters (left arc-shaped breakwater 3 and right arc-shaped breakwater 4) tightly against the inner side of the tank wall 5. This arrangement directly acts on the antinodes of the sloshing waves, utilizing the arc-shaped profile of the breakwaters, their inclined sides 6, and the rectangular holes 6A penetrating the main body of the breakwaters to dissipate the liquid kinetic energy. Given the sloshing characteristics of rectangular liquid tanks, the maximum wave amplitude and impact load typically occur in the tank wall 5 region. The left arc-shaped breakwater 3 and the right arc-shaped breakwater 4 are rigidly connected to the inner sides of the two tank walls 5, allowing them to directly intercept and dissipate the high-energy liquid flow rushing towards the tank wall 5, suppressing the impact at its source. The arc-shaped structure of the breakwaters guides the liquid flow along the curved surface, and, in conjunction with the inclined sides 6, forces the flowing liquid to generate directional, gradual vortices. This vortex motion effectively converts the macroscopic lateral kinetic energy of the liquid into small-scale turbulent energy and ultimately dissipates it. The rectangular hole 6A on the main body of the breakwater can induce jet collision and secondary vortex. When the liquid flows through the rectangular hole 6A, some of the liquid passes through the hole at high speed, forming a jet. This jet collides and shears strongly with the relatively low-speed liquid or the liquid flowing in the opposite direction near the bulkhead 5 of the breakwater, instantly generating intense small-scale turbulence and secondary vortex. In addition, the rectangular hole 6A provides an additional liquid channel, increasing the complexity of the flow and the path length. Through the friction between the fluid and the hole wall, jet mixing and breaking, etc., the additional energy dissipation is significantly increased.

[0028] The core geometric parameters and their arrangement constitute the basic design of the breakwater. Using a parametric model, the breakwater configuration, including the location, size, and number of rectangular orifices 6A, can be determined based on different tank sizes and design water depths to ensure effective suppression. For tanks with large aspect ratios, the breakwater width distribution can be adjusted or the thickness can be locally reinforced to balance efficiency and strength.

[0029] The installation and use process of this utility model is as follows: In actual use, based on the geometric dimensions of the liquid tank and the loading water depth (30% of the tank height), the height of the left arc-shaped breakwater 3 and the right arc-shaped breakwater 4 is determined to be 60% of the tank height; the transverse width of the breakwater (5% of the tank width) is calculated based on the width of the liquid tank, and the inclination angle of the arc-shaped side of the breakwater is optimized through fluid dynamics simulation; the welding connection method is selected based on the thickness of the liquid tank wall 5 and the material strength; the installation positions of the left arc-shaped breakwater 3 and the right arc-shaped breakwater 4 are adjusted according to the length of the liquid tank so that they are symmetrically distributed in the area of ​​the tank wall 5 on both sides of the liquid tank body 1.

[0030] The operation process of this utility model is as follows: The liquid 2 inside the tank generates lateral sloshing under the action of external excitation. When the liquid wave rises to the coverage area of ​​the left arc-shaped breakwater 3 and the right arc-shaped breakwater 4, the inclined side 6 of the breakwater and the rectangular hole 6A on it guide the liquid to form a progressive vortex flow. The lateral kinetic energy of the liquid is suppressed by the bilateral symmetrical reflection and energy dissipation. When the liquid wave crosses the top of the breakwater, its remaining energy is further attenuated by the height restriction area of ​​the breakwater, which finally significantly reduces the amplitude of the liquid surface sloshing and the impact pressure of the tank wall 5, thus completing the sloshing suppression process.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A structure of double side breakwater applied to rectangular tank sloshing suppression, characterized in that, include: The breakwater assembly includes a left arc-shaped breakwater (3) and a right arc-shaped breakwater (4) arranged inside the liquid tank body (1). The liquid tank body (1) has walls (5) on both sides. The left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are respectively attached to the inner side of the two side walls (5). The bottom of the left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are attached to the bottom surface (9) of the liquid tank body (1), and the top of the left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are lower than the top surface (8) of the liquid tank body (1). The left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are both arc-shaped, and the side away from the bulkhead (5) has an arc-shaped inclined side (6), and multiple rectangular holes (6A) are evenly opened on the inclined side (6).

2. The double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank according to claim 1, characterized in that, The left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) have the same structure and are arranged symmetrically.

3. The double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank according to claim 2, characterized in that, The height of the left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are both 60% of the height of the liquid tank body (1), and the distance between the top of the left arc-shaped breakwater (3) and the top of the liquid tank (8) is 40% of the height of the tank.

4. The double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank according to claim 2, characterized in that, The widths of the left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are both 5% of the width of the liquid tank body (1).

5. The double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank according to claim 1, characterized in that, The left arc-shaped breakwater (3) and the right arc-shaped breakwater (4) are welded to the two side bulkheads (5) respectively, and the welded joints form a welded seam (7).

6. The double-sided breakwater structure for suppressing sloshing in a rectangular liquid tank according to claim 1, characterized in that, The liquid tank body (1) is a rectangular structure, which contains liquid (2) and the designed water depth of the liquid tank body (1) is 30% of the tank height.

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