Ship bubble drag reduction detection device and ship

Abstract

A ship bubble drag reduction detection device and a ship. The ship bubble drag reduction detection device comprises a bubble generation unit (1), a light source emission unit (2) and a detection unit, wherein the bubble generation unit (1) is fixed to the bottom of a hull (100), the bubble generation unit (1) can generate bubbles, and the bubbles can be attached to the bottom of the hull (100) to form a bubble attachment region (110). The light source emission unit (2) is arranged at the bottom of the hull (100), and the light source emission unit (2) emits light towards the bottom of the hull (100) and illuminates the bubble attachment region (110). The detection unit is arranged at the bottom of the hull (100), and can collect and analyze images of the bubble flow in the bubble attachment region (110).

Description

Ship bubble drag reduction detection device and ship

[0001] This application claims priority to Chinese Patent Application No. 202411526174.1, filed on October 30, 2024, and Chinese Patent Application No. 202422627639.4, filed on October 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of ship drag reduction technology, for example to a ship bubble drag reduction detection device and a ship. Background Technology

[0003] The modern world faces increasingly severe energy shortages and environmental pollution problems. The shipbuilding industry needs a scientific and economical approach to achieve sustainable development. One of the most important ways to improve ship economics is to reduce ship drag. In related technologies, to reduce drag during ship navigation, bubble drag reduction devices are installed at the bottom of the hull. During ship navigation, tiny bubbles of a certain volume are generated on the hull surface. A large number of bubbles accumulate at the bottom of the hull, forming a gas-liquid two-phase flow, thereby reducing the density, viscosity, and turbulent flow structure of the water around the hull, thus achieving the purpose of drag reduction.

[0004] Traditional bubble drag reduction devices can only control the generation and release of bubbles. Due to the significant diffusion of bubbles near the hull wall in the mid-to-aft section, the near-wall drag reduction effect drops sharply. Traditional testing techniques cannot monitor the bubble distribution and bubble flow at the bottom of the hull in real time, and the bubble drag reduction device can interfere with the flow field when collecting flow field information, resulting in poor drag reduction and detection effects. Summary of the Invention

[0005] One objective of this application is to provide a ship bubble drag reduction detection device that can collect and analyze transient full-field flow characteristics without disturbing the flow field under test, and more accurately and comprehensively capture and monitor the gas-liquid two-phase flow at the bottom of the ship.

[0006] To achieve this objective, the following technical solution is adopted in this application:

[0007] A ship bubble drag reduction detection device is provided, comprising:

[0008] A bubble generating unit is fixed to the bottom of the hull. The bubble generating unit can generate bubbles that can adhere to the bottom of the hull, forming a bubble attachment area.

[0009] A light source emitting unit is disposed at the bottom of the hull, and the light source emitting unit emits light towards the bottom of the hull and illuminates the bubble attachment area;

[0010] A detection unit is installed at the bottom of the hull and is capable of acquiring and analyzing images of the flow of bubbles in the bubble attachment area.

[0011] In some embodiments, the detection unit includes an image acquisition device capable of acquiring images of the bubble attachment area.

[0012] In some embodiments, the detection unit further includes an image analyzer, which is signal-connected to the image acquisition unit and is used to receive images acquired by the image acquisition unit.

[0013] In some embodiments, the bubble generating unit includes an air compressor disposed within the hull of the ship, the air compressor being used to generate the bubbles.

[0014] In some embodiments, the bubble generating unit further includes a bubble dispensing mechanism, which is installed on the bottom wall of the hull, and the air compressor is connected to the bubble dispensing mechanism.

[0015] In some embodiments, the bubble generating unit further includes a pressure controller connected between the air compressor and the bubble dispensing mechanism.

[0016] In some embodiments, the light source emitting unit includes a laser, which is mounted on the bottom of the hull and is capable of emitting laser light toward the bubble attachment area.

[0017] In some embodiments, the light source emitting unit further includes a light source reflector, the laser being able to emit laser light toward the light source reflector, and the light source reflector being able to reflect the laser light toward the bubble attachment area.

[0018] Another objective of this application is to provide a vessel capable of real-time monitoring of drag-reducing bubbles at the hull bottom during operation, thereby more accurately and comprehensively capturing and monitoring the flow of the gas-liquid two-phase flow at the hull bottom.

[0019] To achieve this objective, the following technical solution is adopted in this application:

[0020] A ship is provided, including a hull and the aforementioned ship bubble drag reduction detection device, wherein the ship bubble drag reduction detection device is disposed at the bottom of the hull.

[0021] In some embodiments, the vessel includes a plurality of the vessel bubble drag reduction detection devices, which are arranged along the direction of the vessel's movement on the bottom of the hull. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of the ship bubble drag reduction detection device provided in this application;

[0023] Figure 2 is a structural schematic diagram of the ship provided in this application.

[0024] In the picture:

[0025] 1. Bubble generating unit; 11. Air compressor; 12. Bubble dispensing mechanism; 13. Air pressure controller; 14. Air delivery pipe;

[0026] 2. Light source emitting unit; 21. Laser; 22. Light source reflector;

[0027] 3. Image acquisition device;

[0028] 100. Hull; 110. Bubble attachment area. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present application, not the entire structure.

[0030] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0033] As shown in Figure 1, the ship bubble drag reduction detection device of this embodiment includes a bubble generating unit 1, a light source emitting unit 2, and a detection unit. The bubble generating unit 1 is fixed to the bottom of the hull 100 and can generate bubbles that can adhere to the bottom of the hull 100, forming a bubble attachment area 110. The light source emitting unit 2 is located at the bottom of the hull 100 and emits light towards the bottom of the hull 100, illuminating the bubble attachment area 110. The detection unit is located at the bottom of the hull 100 and can acquire and analyze images of the bubble flow in the bubble attachment area 110.

[0034] Based on the above design, the ship bubble drag reduction detection device provided in this embodiment arranges a bubble generating unit 1 at the bottom of the hull 100. The generated bubbles gather and adhere to the bubble attachment area 110 at the bottom of the hull, forming a gas-liquid two-phase flow. This reduces the density, viscosity, and turbulent flow structure of the water around the hull, thereby reducing the drag of the hull 100 during its forward movement. A light source emitting unit 2 generates a light beam, which illuminates the bubble attachment area 110. A detection unit captures the distribution image of the bubbles on the bubble attachment area 110 in real time. Image analysis is used to obtain the flow characteristics of the flow field at the bottom of the hull 100, enabling real-time monitoring of the flow field at the bottom of the hull 100. This ship bubble drag reduction detection device can reduce the drag of the ship during forward movement without affecting the flow field at the bottom of the hull 100, ensuring the drag reduction effect, reducing the energy consumption of the hull 100 during operation, and can monitor the flow conditions at the bottom of the hull in real time. It has good academic and practical engineering significance.

[0035] It should be noted that traditional flow field testing techniques, such as hot-wire hot-film anemometers (HWFA) and laser Doppler velocimeters (LDV), can only obtain information from a single point in space. When measuring and capturing transient, comprehensive flow field information, these methods can disturb the bubble flow field, causing measurement errors. In this embodiment, particle image velocimetry (PIV) is used for measurement. This technique can be used to measure the gas-liquid phase velocity field. Compared to traditional methods such as hot-wire hot-film anemometers (HWFA) and laser Doppler velocimeters (LDV), it does not disturb the bubble flow field, enabling monitoring of more realistic operating scenarios and significantly improving measurement accuracy. Furthermore, PIV can obtain transient, full-field flow conditions, resulting in more comprehensive measurement information. Furthermore, traditional PIV testing technology requires the setting of tracer particles. By monitoring the tracer particles, scientific calculation results are calculated based on the displacement and time interval of different tracer particles in the flow field image. In this embodiment, bubbles are used as tracer particles, eliminating the need for additional tracer particle distribution, thus avoiding pollution of the marine and river environment and making it green and environmentally friendly.

[0036] Furthermore, this ship bubble drag reduction detection device also plays a role in the scientific research of bubble drag reduction technology. Applying this device, measurements and mechanistic studies of ship bubble drag reduction technology can be conducted, such as: measuring and studying the impact of different ship bow wakes on bubble stability; verifying numerical simulation methods for gas lubrication drag reduction design of real-scale shipping vessels; and assisting in adaptive control of gas lubrication energy saving and carbon reduction based on ship navigation status monitoring.

[0037] Furthermore, the bubble generating unit 1 includes an air compressor 11, a bubble dispensing mechanism 12, and an air supply pipe 14. The air compressor 11 is located inside the hull 100, and the bubble dispensing mechanism 12 is installed on the bottom wall of the hull 100. The air compressor 11 and the bubble dispensing mechanism 12 are connected. The air compressor 11 and the bubble dispensing mechanism 12 are connected through the air supply pipe 14. The air compressor 11 is used to generate bubbles, and the bubbles are transported to the bubble dispensing mechanism 12 through the air supply pipe 14. The bubble dispensing mechanism 12 releases bubbles into the bubble attachment area 110 through a porous structure, forming a bubble flow.

[0038] Optionally, the bubble generating unit 1 also includes a pressure controller 13. The air compressor 11, the pressure controller 13, and the bubble spreading mechanism 12 are connected in sequence via an air supply pipe 14. The pressure of the bubbles is adjusted by the pressure controller 13, and the pressurized bubbles are transported to the bubble spreading mechanism 12 through the air supply pipe 14. The bubble spreading mechanism 12 releases bubbles into the bubble attachment area 110 to form a bubble flow. The pressure controller 13 can control the bubble delivery pressure, thereby controlling the bubble delivery speed, and controlling the airflow ratio of each bubble spreading mechanism 12 to make the bubble coverage more complete and uniform, further improving the drag reduction effect.

[0039] Furthermore, the light source emitting unit 2 includes a laser 21, which is mounted on the bottom of the hull 100. The laser 21 can emit laser light towards the bubble attachment area 110, providing a light source for the bubble attachment area 110 and illuminating the bubbles in the bubble attachment area 110. This eliminates the need for additional tracer particles, ensuring that the image acquisition device 3 can acquire clear images. In this embodiment, the laser 21 forms a sheet light source to illuminate the bubble attachment area 110.

[0040] Optionally, the light source emitting unit 2 further includes a light source reflector 22. The laser 21 can emit laser light towards the light source reflector 22, and the light source reflector 22 can reflect the laser light onto the bubble attachment area 110. By setting the light source reflector 22, the propagation path of the laser can be changed. When it is necessary to adjust the position of the bubble attachment area 110, the laser can be adjusted to irradiate the bubble attachment area 110 by adjusting the light source reflector 22. For example, the light source reflector 22 can be set as a reflector, a metal reflector, etc.

[0041] Furthermore, the detection unit includes an image acquisition unit 3 and an image analyzer (not shown in the figure). The image acquisition unit 3 is used to acquire images of the bubble attachment area 110, and the image analyzer is signal-connected to the image acquisition unit 3 to receive and analyze the images acquired by the image acquisition unit 3. Optionally, the image acquisition unit 3 is a high-speed camera, which performs cross-correlation analysis on the acquired bubble images to conduct computational studies on the flow field at the bottom of the ship.

[0042] As shown in Figure 2, this embodiment also provides a ship, including a hull 100 and the aforementioned ship bubble drag reduction detection device. The ship bubble drag reduction detection device is disposed at the bottom of the hull 100, and monitors the bubble flow at the bottom of the hull 100 in real time, providing precise measurement of the flow field at the bottom of the ship. This ship can monitor the distribution of bubbles at the bottom of the ship and the surrounding flow field in real time, which can reduce the ship's operating costs and improve the working efficiency of the bubble drag reduction device.

[0043] Furthermore, the vessel is equipped with multiple ship bubble drag reduction detection devices, which are arranged along the bottom of the hull 100 in the direction of the vessel's movement, so that the bubbles cover the entire length of the vessel, ensuring that the bubbles in the bubble drag reduction detection devices are more continuous and complete. For example, three, four, six, etc., ship bubble drag reduction detection devices can be set along the direction of the vessel's movement.

[0044] This application provides a ship, including a hull and the aforementioned ship bubble drag reduction detection device. The ship bubble drag reduction detection device is installed at the bottom of the hull and can reduce the resistance when the ship moves forward, monitor the flow field at the bottom of the hull in real time, and help reduce the cost of ship operation.

Claims

1. A ship bubble drag reduction detection device, comprising: A bubble generating unit (1) is fixed to the bottom of the hull (100). The bubble generating unit (1) can generate bubbles, and the bubbles can adhere to the bottom of the hull (100) to form a bubble attachment area (110). A light source emitting unit (2) is disposed at the bottom of the hull (100). The light source emitting unit (2) emits light to the bottom of the hull (100) and illuminates the bubble attachment area (110). The detection unit is located at the bottom of the hull (100) and is capable of acquiring and analyzing images of the bubble flow in the bubble attachment area (110).

2. The ship bubble drag reduction detection device according to claim 1, wherein, The detection unit includes an image acquisition unit (3) which is capable of acquiring images of the bubble attachment area (110).

3. The ship bubble drag reduction detection device according to claim 2, wherein, The detection unit also includes an image analyzer, which is signal-connected to the image acquisition unit (3) and is used to receive images acquired by the image acquisition unit (3).

4. The ship bubble drag reduction detection device according to claim 1, wherein, The bubble generating unit (1) includes an air compressor (11) disposed inside the hull (100) and is used to generate the bubbles.

5. The ship bubble drag reduction detection device according to claim 4, wherein, The bubble generating unit (1) further includes a bubble spreading mechanism (12), which is installed on the bottom wall of the hull (100). The air compressor (11) and the bubble spreading mechanism (12) are connected.

6. The ship bubble drag reduction detection device according to claim 5, wherein, The bubble generating unit (1) further includes a pressure controller (13), which is connected between the air compressor (11) and the bubble dispensing mechanism (12).

7. The ship bubble drag reduction detection device according to claim 1, wherein, The light source emitting unit (2) includes a laser (21), which is installed at the bottom of the hull (100) and is capable of emitting laser light toward the bubble attachment area (110).

8. The ship bubble drag reduction detection device according to claim 7, wherein, The light source emitting unit (2) further includes a light source reflector (22), the laser (21) is capable of emitting laser light towards the light source reflector (22), and the light source reflector (22) is capable of reflecting the laser light onto the bubble attachment area (110).

9. A vessel, comprising a hull (100) and a vessel bubble drag reduction detection device according to any one of claims 1-8, wherein the vessel bubble drag reduction detection device is disposed at the bottom of the hull (100).

10. The vessel according to claim 9, wherein, The vessel is equipped with multiple vessel bubble drag reduction detection devices, which are arranged along the direction of the vessel's movement on the bottom of the hull (100).

Images