An internal circulation flow device based on a split fairing and a method for generating flow

Abstract

The application provides an internal circulation flow generating device based on a split fairing and a flow generating method, and belongs to the field of ship and ocean engineering experiments. The problems that the existing flow generating device is not suitable for an elongated ice water pool and has energy attenuation on waves are solved. The flow generating device comprises a bidirectional flow generating pump, a split fairing, an integrated fairing and a clamping bottom. The split fairing and the integrated fairing are arranged on the left side and the right side respectively. The clamping bottom is horizontally arranged between the split fairing and the integrated fairing. The number of the bidirectional flow generating pump is two. The two bidirectional flow generating pumps are arranged on the split fairing and the integrated fairing respectively, and are located below the clamping bottom. The split fairing comprises a plurality of split fairing plates with adjustable angles. It is mainly used for internal circulation flow generation in an elongated ice water pool.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding and marine engineering experiments, and in particular relates to an internal circulation flow generation device and flow generation method based on a split fairing. Background Technology

[0002] Over the past four decades, the coverage and thickness of Arctic sea ice have been steadily shrinking, leading to a growing emphasis on the Arctic by various countries. The polar regions are rich in oil and gas, fisheries, and other resources. Furthermore, the opening of Arctic shipping routes has reduced voyages by at least 40%, significantly improving shipping efficiency. To develop Arctic resources and shipping routes, countries have intensified their research and development efforts on polar vessels and floating structures. The extreme load-bearing environment of the polar regions also presents many complex mechanical problems. Compared to conventional sea areas, the study of sea ice loads unique to the polar regions is particularly important. The interaction between wind, wave, and current loads in the ocean, inducing sea ice drift and deposition, and its interaction with structures remains a subject of ongoing research.

[0003] Sea ice encountered by polar vessels during icebreaking navigation is classified into two types based on its surface characteristics: smooth ice and deformed ice. Civilian vessels primarily target layered ice. Therefore, analyzing the dynamic response of layered ice under wind, wave, and current coupling conditions can improve the icebreaking capabilities, efficiency, and profitability of both civilian and merchant ships.

[0004] Existing research primarily focuses on square ice-water pools, lacking experimental setups for observing the dynamic response of layer ice under simulated wind-wave-current-sea-ice coupling conditions in elongated ice-water pools. The current-generating area of ​​a square ice-water pool is typically only 1 / 2 to 1 / 3 of the pool width, allowing for the backflow of currents generated by the current generator in the non-current-generating area and rotation at the far end of the experiment. Figure 7 As shown. However, for long and narrow drag pools, the flow generation area usually needs to be equal to or slightly smaller than the pool width. Traditional long drag pools cannot meet the requirements for conducting flow generation experiments. Summary of the Invention

[0005] In view of this, the present invention aims to propose an internal circulation flow generation device and flow generation method based on a split fairing, so as to solve the problem that existing flow generation devices are not suitable for slender ice water pools and have energy attenuation for waves.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an internal circulation flow generating device based on a split fairing, comprising a bidirectional flow generating pump, a split fairing, an integrated fairing, and a clamping bottom. The split fairing and the integrated fairing are respectively disposed on the left and right sides, and the clamping bottom is horizontally disposed between the split fairing and the integrated fairing. There are two bidirectional flow generating pumps, which are respectively disposed on the split fairing and the integrated fairing, and are located below the clamping bottom. The split fairing comprises multiple angle-adjustable split fairing plates.

[0007] Furthermore, the detachable fairing also includes a fairing base, with multiple detachable fairing plates disposed above the fairing base.

[0008] Furthermore, the number of the split rectifier plates is three.

[0009] Furthermore, the split rectifier plate has several perforations.

[0010] Furthermore, the perforation has a square structure.

[0011] Furthermore, the split rectifier plate is made of composite material.

[0012] Furthermore, the clamping bottom is made of alloy material.

[0013] Furthermore, the flow-generating device is installed in a long and narrow ice-water pool, and a layer of ice is placed above the flow-generating device.

[0014] Furthermore, a wind-generating device and a wave-generating device are provided on one side of the elongated ice water pool, and wave-damping devices are provided on both sides of the elongated ice water pool. The separate rectifier of the flow-generating device is located on one side of the wave-generating device.

[0015] This invention also provides a flow generation method for an internal circulation flow generation device based on a split rectifier, specifically: two bidirectional flow generation pumps are turned on, and the two bidirectional flow generation pumps respectively push and suck the flow to generate a flow direction that is the same as or opposite to the wave direction. The water flow rotates clockwise or counterclockwise around the bottom of the clamp to form an internal circulation water flow. The power of the bidirectional flow generation pumps is adjusted to make the water flow reach the set flow rate. After the flow rate stabilizes, the angle between the split rectifier plate and the incoming flow is adjusted so that the incoming flow above the bottom of the clamp is in the same direction or opposite to the wave direction.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This invention uses an internal circulation device suitable for elongated ice-water pools for flow generation. However, traditional internal circulation flow generation devices impede the waves in the upper part of the bottom layer. Therefore, this invention provides an internal circulation flow generation device based on a split-type fairing, which greatly reduces the obstruction to waves, preserves the waves in the upper part of the bottom layer, and can better simulate the coupling of waves and currents, thereby enabling the conduct of coupling experiments between wind, waves, currents, and sea ice. This invention meets the requirements of unidirectional fluid flow, reduces wave energy attenuation, and avoids the obstruction of some waves.

[0017] The specific advantages are as follows:

[0018] 1. This invention uses internal circulation to generate flow, which overcomes the shortcomings of existing square water tank flow generation methods that are not suitable for long and narrow ice water tanks;

[0019] 2. This invention employs internal circulation to generate flow, avoiding the influence of the external environment of the ice water pool on the flow generation device, thus achieving stable and continuous flow generation;

[0020] 3. This invention employs a split fairing, which ensures unidirectional fluid flow and reduces wave energy attenuation;

[0021] 4. The split fairing of this invention avoids obstructing the waves in the upper part of the sandwich, retains most of the waves in the upper part of the sandwich, and makes the coupling of waves and currents closer to the actual polar working conditions, reducing experimental errors.

[0022] 5. The internal circulation flow generation device of the present invention adopts a bidirectional jet pump, which can realize bidirectional flow generation and facilitate the simulation and observation of different working conditions.

[0023] 6. This invention is safe and convenient to operate, has low site requirements, is suitable for conducting ice-water pool experiments, and has wide applicability. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of an internal circulation flow generation device based on a split rectifier fairing according to the present invention.

[0026] Figure 2 This is a schematic diagram of the split fairing structure described in this invention;

[0027] Figure 3 This is a schematic diagram of the split rectifier plate structure described in this invention;

[0028] Figure 4This is a schematic diagram of the wave coupling operation of the clockwise downward internal circulation flow generation device described in this invention;

[0029] Figure 5 This is a schematic diagram of the wave and incoming flow coupling operation of the counterclockwise downward internal circulation flow generation device described in this invention;

[0030] Figure 6 This is a schematic diagram of the layer ice damage state described in this invention;

[0031] Figure 7 This is a schematic diagram of the existing square ice water pool flow generation method described in this invention.

[0032] In the diagram: 1: bidirectional flow pump, 2: separate rectifier, 3: integrated rectifier, 4: bottom clamp, 5: elongated ice water pool, 6: air generation device, 7: wave generation device, 8: wave damping device, 9: ice layer, 10: square ice water pool, 11: flow generator, 12: flow test section, 13: reflux, 2-1: rectifier base, 2-2: separate rectifier plate. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0034] See Figure 1-6 This embodiment describes an internal circulation flow generation device based on a split fairing. It includes a bidirectional flow generation pump 1, a split fairing 2, an integrated fairing 3, and a clamping bottom 4. The split fairing 2 and the integrated fairing 3 are respectively disposed on the left and right sides. The clamping bottom 4 is horizontally disposed between the split fairing 2 and the integrated fairing 3. There are two bidirectional flow generation pumps 1, which are respectively disposed on the split fairing 2 and the integrated fairing 3, and are located below the clamping bottom 4. Bidirectional flow generation can be achieved during the experiment through the two bidirectional flow generation pumps 1.

[0035] The split fairing 2 includes a fairing base 2-1 and multiple angle-adjustable split fairing plates 2-2. The multiple split fairing plates 2-2 are positioned above the fairing base 2-1. Preferably, there are three split fairing plates 2-2. The split fairing plates 2-2 are made of composite materials and are angle-adjustable. The angles of the three split fairing plates 2-2 are adjusted according to different incoming flow velocities and directions to obtain an incoming flow that meets experimental requirements, ensuring that the incoming flow above the clamp 4 is parallel to the wave direction.

[0036] Preferably, the split rectifier plate 2-2 has several perforations, which are square in structure, allowing waves to pass through and minimizing the energy consumption of the waves, thus enabling the waves to couple with the waves on the bottom plate 4.

[0037] The integrated fairing 3 can adjust the flow direction on the right side of the device, allowing it to complete the backflow above and below the clamp 4, thus entering the bidirectional flow pump 1 on the right side. The clamp 4 is a horizontal alloy plate located between the separate fairing 2 and the integrated fairing 3, separating the incoming flows from different directions above and below the clamp 4 to avoid mutual interference.

[0038] When conducting wind-wave-sea ice coupling experiments, the current-generating device is placed in a long and narrow ice-water pool 5. A layer of ice 9 is placed above the current-generating device. A wind-generating device 6 and a wave-generating device 7 are placed on one side of the long and narrow ice-water pool 5. Wave-damping devices 8 are placed on both sides of the long and narrow ice-water pool 5. The split rectifier 2 of the current-generating device is located on one side of the wave-generating device 7.

[0039] Once the experiment begins, the two bidirectional flow-generating pumps 1 are turned on first. The two pumps 1 perform push and suction respectively. If the left-side pump 1 performs push and the right-side pump 1 performs suction, the water flows clockwise within the internal circulation flow-generating device. Figure 4 As shown; if the bidirectional flow-generating pump 1 on the left performs suction and the bidirectional flow-generating pump 1 on the right performs push flow, then the water flows counterclockwise within the internal circulation flow-generating device, as shown. Figure 5 As shown. This generates a flow direction that is the same as or opposite to the wave direction. The power of the bidirectional flow pump 1 is adjusted to achieve a flow velocity of 0.02-0.2 m / s, simulating a polar flow field. Once the flow velocity stabilizes, the angle between the split-type rectifier plate 2-2 and the incoming flow is adjusted so that the incoming flow above the bottom plate 4 is in the same or opposite direction to the wave. Next, the wind generator 6 and wave generator 7 are turned on and adjusted. Then, layer ice 9 is placed, and observations are conducted, experimental images are collected, experimental data are recorded, and the fracture length and damage pattern of layer ice 9 are observed.

[0040] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. An internal circulation flow generation device based on a split-type fairing, characterized in that: It includes a bidirectional flow pump (1), a separate fairing (2), an integrated fairing (3), and a clamp (4). The separate fairing (2) and the integrated fairing (3) are respectively located on the left and right sides. The clamp (4) is horizontally located between the separate fairing (2) and the integrated fairing (3). There are two bidirectional flow pumps (1). The two bidirectional flow pumps (1) are respectively located on the separate fairing (2) and the integrated fairing (3), and the two bidirectional flow pumps (1) are located below the clamp (4). The separate fairing (2) includes multiple angle-adjustable separate fairing plates (2-2). The split rectifier plate (2-2) has several perforations; The perforation has a square structure; The flow-generating device is installed in a long and narrow ice water pool (5), and a layer of ice (9) is installed above the flow-generating device; A wind-generating device (6) and a wave-generating device (7) are provided on one side of the elongated ice water pool (5), and wave-damping devices (8) are provided on both sides of the elongated ice water pool (5). The separate rectifier (2) of the flow-generating device is located on one side of the wave-generating device (7).

2. The internal circulation flow generating device based on a split rectifier fairing according to claim 1, characterized in that: The split fairing (2) also includes a fairing base (2-1), and multiple split fairing plates (2-2) are arranged above the fairing base (2-1).

3. The internal circulation flow generating device based on a split rectifier fairing according to claim 1, characterized in that: The number of the split rectifier plates (2-2) is three.

4. The internal circulation flow generating device based on a split rectifier according to claim 1, characterized in that: The split rectifier plate (2-2) is made of composite material.

5. The internal circulation flow generating device based on a split rectifier according to claim 1, characterized in that: The bottom (4) is made of alloy material.

6. A flow generation method for an internal circulation flow generation device based on a split-type fairing as described in claim 1, characterized in that: Turn on the two bidirectional flow pumps (1). The two bidirectional flow pumps (1) push the flow and suck the flow respectively, generating a flow direction that is the same as or opposite to the wave direction. The water flow rotates clockwise or counterclockwise around the bottom (4) to form an internal circulation flow. Adjust the power of the bidirectional flow pumps (1) to make the water flow reach the set flow rate. After the flow rate stabilizes, adjust the angle between the split rectifier plate (2-2) and the incoming flow so that the incoming flow above the bottom (4) is in the same direction or opposite to the wave direction.

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