Ship bubble resistance reduction detection device and ship

Abstract

The invention belongs to the technical field of ship resistance reduction, and discloses a ship bubble resistance reduction detection device and a ship. The ship bubble resistance reduction detection device comprises a bubble generation unit, a light source emission unit and a detection unit, the bubble generation unit is fixed to the bottom of a ship body, the bubble generation unit can generate bubbles, and the bubbles can be attached to the bottom of the ship body to form a bubble attachment area. The light source emitting unit is arranged at the bottom of the ship body and emits light to the bottom of the ship body and illuminates the bubble attachment area. The detection unit is arranged at the bottom of the ship body and can collect and analyze images of bubble flowing conditions in the bubble attachment area. According to the ship bubble resistance reduction detection device, under the condition that a flow field at the bottom of a ship body is not influenced, the resistance of the ship during advancing can be reduced, the energy consumption of ship body operation can be reduced, the flow condition of the flow field at the bottom of the ship body can be monitored in real time, and good academic significance and practical engineering significance are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ship drag reduction, and in particular to a ship bubble drag reduction detection device and a ship. Background Art

[0002] The modern world is facing increasingly serious energy shortage and environmental pollution problems. The shipping industry needs a scientific and economical way to achieve sustainable development. One of the main ways to improve the economy of ships is to reduce the drag of ships. In the prior art, in order to reduce the resistance of ships during navigation, a bubble drag reduction device is installed at the bottom of the hull. When the ship is sailing, a certain amount of bubbles of small volume are generated on the surface of the hull. A large number of bubbles gather at the bottom of the hull to form a gas-liquid two-phase flow, thereby reducing the density, viscosity and turbulent flow structure of the water around the hull, thereby achieving the purpose of drag reduction.

[0003] Traditional bubble drag reduction devices can only control the generation and release of bubbles. Due to the significant diffusion of bubbles near the wall in the middle and rear section of the hull, the drag reduction effect near the wall drops sharply. Traditional testing technology cannot monitor the distribution of bubbles and the bubble flow at the bottom of the hull in real time. In addition, the bubble drag reduction device will interfere with the flow field when collecting flow field information, resulting in poor drag reduction and detection effects.

[0004] Therefore, there is an urgent need for a ship bubble drag reduction detection device and a ship to solve the above problems. Summary of the invention

[0005] One purpose of the present invention is to provide a ship bubble drag reduction detection device, which can collect and analyze the transient flow characteristics of the entire flow field without disturbing the flow field to be measured, and more accurately and comprehensively capture and monitor the flow of the gas-liquid two-phase flow at the bottom of the hull.

[0006] To achieve this object, the present invention adopts the following technical solutions:

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

[0008] A bubble generating unit, the bubble generating unit is fixed to the bottom of the hull, the bubble generating unit is capable of generating bubbles, and the bubbles are capable of adhering to the bottom of the hull to form a bubble adhering area;

[0009] A light source emitting unit, the light source emitting unit being arranged at the bottom of the hull, the light source emitting unit emitting light toward the bottom of the hull and illuminating the bubble attachment area;

[0010] A detection unit is arranged at the bottom of the hull and can collect and analyze images of the bubble flow conditions in the bubble attachment area.

[0011] As an optional solution of the ship bubble drag reduction detection device, the detection unit includes an image collector, and the image collector is capable of collecting images of the bubble attachment area.

[0012] As an optional solution of the ship bubble drag reduction detection device, the detection unit also includes an image analyzer, which is signal-connected to the image collector and is used to receive images collected by the image collector.

[0013] As an optional solution of the ship bubble drag reduction detection device, the bubble generating unit includes an air compressor, which is arranged in the hull and is used to produce the bubbles.

[0014] As an optional solution of the ship bubble drag reduction detection device, the bubble generating unit also includes a bubble spreading mechanism, the bubble spreading mechanism is installed on the bottom wall of the hull, and the air compressor is connected to the bubble spreading mechanism.

[0015] As an optional solution of the ship bubble drag reduction detection device, the bubble generating unit also includes an air pressure controller, and the air pressure controller is connected between the air compressor and the bubble spreading mechanism.

[0016] As an optional solution of the ship bubble drag reduction detection device, the light source emitting unit includes a laser, and the laser is installed at the bottom of the hull, and the laser can emit laser to the bubble attachment area.

[0017] As an optional solution of the ship bubble drag reduction detection device, the light source emitting unit also includes a light source reflector, the laser can emit laser to the light source reflector, and the light source reflector can reflect the laser to the bubble attachment area.

[0018] Another object of the present invention is to provide a ship that can monitor the drag-reducing bubbles at the bottom of the ship in real time during operation, and more accurately and comprehensively capture and monitor the flow of the gas-liquid two-phase flow at the bottom of the hull.

[0019] To achieve this object, the present invention adopts the following technical solutions:

[0020] A ship is provided, comprising a hull and the above-mentioned ship bubble drag reduction detection device, wherein the ship bubble drag reduction detection device is arranged at the bottom of the hull.

[0021] As an optional solution for the ship, the ship includes a plurality of the ship bubble drag reduction detection devices, and the plurality of the ship bubble drag reduction detection devices are arranged at the bottom of the hull along the forward direction of the ship.

[0022] Beneficial effects of the present invention:

[0023] The present invention provides a ship bubble drag reduction detection device, in which a bubble generating unit is arranged at the bottom of the hull, and the generated bubbles gather and adhere to the bottom of the hull to form a gas-liquid two-phase flow, thereby reducing the density, viscosity and turbulent flow structure of the water around the hull, and achieving the effect of reducing the resistance of the hull during its advancement. A light source emitting unit is used to generate a light beam, which is irradiated onto the bubble attachment area, and a detection unit is used to capture the distribution image of the bubbles on the bubble attachment area of ​​the bottom of the ship in real time. The flow characteristics of the flow field at the bottom of the hull are obtained through image analysis, and real-time monitoring of the smoothness of the bottom of the hull is achieved. The ship bubble drag reduction detection device can reduce the resistance of the ship when it is advancing without affecting the flow field at the bottom of the hull, ensure the effect of reducing resistance, reduce the energy consumption of the hull operation, and can monitor the flow conditions of the flow field at the bottom of the hull in real time, and has good academic significance and practical engineering significance.

[0024] The present invention also provides a ship, comprising a hull and the above-mentioned ship bubble drag reduction detection device, the ship bubble drag reduction detection device is installed at the bottom of the hull, can reduce the resistance of the ship when it moves forward, monitor the flow conditions of the flow field at the bottom of the hull in real time, and is conducive to reducing the cost of ship driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the ship bubble drag reduction detection device provided by the present invention;

[0026] Figure 2 It is a structural schematic diagram of the ship provided by the present invention.

[0027] In the figure:

[0028] 1. Bubble generating unit; 11. Air compressor; 12. Bubble spreading mechanism; 13. Air pressure controller; 14. Air pipe;

[0029] 2. Light source emitting unit; 21. Laser; 22. Light source reflector;

[0030] 3. Image collector;

[0031] 100. Hull; 110. Bubble attachment area. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] like Figure 1 As shown, 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. 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. The light source emitting unit 2 is arranged 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 arranged at the bottom of the hull 100, and can collect and analyze images of the bubble flow in the bubble attachment area 110.

[0037] 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, and the generated bubbles gather and adhere to the bubble attachment area 110 at the bottom of the hull to form a gas-liquid two-phase flow, thereby reducing the density, viscosity and turbulent flow structure of the water around the hull, and achieving the effect of reducing the resistance of the hull 100 during the forward movement. The light source emitting unit 2 is used to generate a light beam, which is irradiated on the bubble attachment area 110, and the detection unit is used to capture the distribution image of the bubbles on the bubble attachment area 110 of the bottom of the ship in real time. The flow characteristics of the bottom flow field of the hull 100 are obtained through image analysis, and the real-time monitoring of the smoothness of the bottom of the hull 100 is achieved. The ship bubble drag reduction detection device can reduce the resistance of the ship when it is moving forward without affecting the bottom flow field of the hull 100, ensure the effect of reducing resistance, reduce the energy consumption of the operation of the hull 100, and can monitor the flow conditions of the bottom flow field of the hull in real time, which has good academic significance and practical engineering significance.

[0038] It should be noted that for flow field testing technology, traditional testing technologies such as hot wire hot film anemometer (HWFA) and laser Doppler velocimeter (LDV) can only obtain information of a single point in space. When measuring and capturing instantaneous and comprehensive flow field information, it will disturb the flow field of the bubble and cause measurement errors. In this embodiment, the particle image velocimetry (PIV) testing technology is used for measurement, which can be used to measure the gas-liquid phase velocity field. Compared with traditional methods such as hot wire hot film anemometer (HWFA) and laser Doppler velocimeter (LDV), it will not disturb the bubble flow field, and can monitor more realistic operation scenes, greatly improving the measurement accuracy. In addition, PIV can obtain the instantaneous flow conditions of the entire flow field, making the information collected by the measurement more comprehensive. In addition, 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, and there is no need to spread additional tracer particles, which will not pollute the marine and river environment and is green and environmentally friendly.

[0039] Furthermore, the ship bubble drag reduction detection device also plays a certain role in the scientific research of bubble drag reduction technology. The device can be used to measure and study the mechanism of ship bubble drag reduction technology, for example: measuring and studying the influence of different ship bow wakes on bubble stability; verifying the numerical simulation method of gas lubrication drag reduction design for full-scale shipping ships; assisting in the adaptive regulation of gas lubrication energy saving and carbon reduction based on ship navigation status monitoring, etc.

[0040] Further, the bubble generating unit 1 includes an air compressor 11, a bubble spreading mechanism 12 and an air pipe 14. The air compressor 11 is arranged in the hull 100, and the bubble spreading mechanism 12 is installed on the bottom wall of the hull 100. The air compressor 11 and the bubble spreading mechanism 12 are connected. The air compressor 11 and the bubble spreading mechanism 12 are connected through the air pipe 14. The air compressor 11 is used to generate bubbles, and the bubbles are transported to the bubble spreading mechanism 12 through the air pipe 14. The bubble spreading mechanism 12 releases bubbles into the bubble attachment area 110 through the porous structure to form a bubble flow.

[0041] Preferably, the bubble generating unit 1 further includes an air pressure controller 13. The air compressor 11, the air pressure controller 13 and the bubble spreading mechanism 12 are sequentially connected through an air pipe 14. The air pressure of the bubbles is adjusted by the air pressure controller 13. The pressurized bubbles are transported to the bubble spreading mechanism 12 through the air pipe 14. The bubbles are released to the bubble attachment area 110 through the bubble spreading mechanism 12 to form a bubble flow. The air pressure controller 13 can control the delivery pressure of the bubbles, thereby controlling the delivery speed of the bubbles, and controlling the ventilation ratio of each bubble spreading mechanism 12, so that the bubble coverage is more complete and uniform, and the drag reduction effect is further improved.

[0042] Furthermore, the light source emitting unit 2 includes a laser 21, which is installed at the bottom of the hull 100. The laser 21 can emit laser light to the bubble attachment area 110, provide a light source for the bubble attachment area 110, illuminate the bubbles in the bubble attachment area 110, and do not need to spread additional tracer particles, so as to ensure that the image collector 3 can collect a clear image. In this embodiment, the laser 21 forms a sheet light source to illuminate the bubble attachment area 110.

[0043] Optionally, the light source emitting unit 2 further includes a light source reflector 22, the laser 21 can emit laser light to the light source reflector 22, and the light source reflector 22 can reflect the laser light to the bubble attachment area 110. By setting the light source reflector 22, the propagation path of the laser light can be changed, and when the position of the bubble attachment area 110 needs to be adjusted, the laser light can be adjusted to irradiate the bubble attachment area 110 by adjusting the light source reflector 22. Exemplarily, the light source reflector 22 can be set as a reflector, a metal reflector, etc.

[0044] Furthermore, the detection unit includes an image collector 3 and an image analyzer (not shown in the figure), the image collector 3 is used to collect images of the bubble attachment area 110, and the image analyzer is connected to the image collector 3 by signal, and is used to receive and analyze the images collected by the image collector 3. Optionally, the image collector 3 is a high-speed camera, and the collected bubble images are cross-correlatedly analyzed to carry out computational research on the flow field at the bottom of the ship.

[0045] like Figure 2As shown, this embodiment also provides a ship, including a hull 100 and the above-mentioned ship bubble drag reduction detection device, the ship bubble drag reduction detection device is arranged at the bottom of the hull 100, and the bubble flow at the bottom of the hull 100 is monitored in real time at the bottom of the ship, and the bottom flow field of the ship is measured in detail. The 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 cost of ship driving and improve the working efficiency of the bubble drag reduction device.

[0046] Furthermore, the ship is provided with a plurality of ship bubble drag reduction detection devices, which are arranged at the bottom of the hull 100 along the direction in which the ship is traveling, so that the bubbles cover the entire length of the ship, ensuring that the bubbles of the bubble drag reduction detection device are more continuous and complete. For example, three, four, six, etc. ship bubble drag reduction detection devices may be provided along the direction in which the ship is traveling.

[0047] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A ship bubble drag reduction detection device, characterized in that: include: A bubble generating unit (1), the bubble generating unit (1) being fixed to the bottom of the hull (100), the bubble generating unit (1) being capable of generating bubbles, the bubbles being capable of adhering to the bottom of the hull (100) to form a bubble adhering area (110); A light source emitting unit (2), the light source emitting unit (2) being arranged at the bottom of the hull (100), the light source emitting unit (2) emitting light toward the bottom of the hull (100) and illuminating the bubble attachment area (110); A detection unit is arranged at the bottom of the hull (100) and is capable of collecting and analyzing images of the bubble flow conditions in the bubble attachment area (110).

2. The ship bubble drag reduction detection device according to claim 1, characterized in that: The detection unit comprises an image collector (3), and the image collector (3) is capable of collecting an image of the bubble attachment area (110).

3. The ship bubble drag reduction detection device according to claim 2, characterized in that: The detection unit also includes an image analyzer, which is signal-connected to the image collector (3) and is used to receive the image collected by the image collector (3).

4. The ship bubble drag reduction detection device according to claim 1, characterized in that: The bubble generating unit (1) comprises an air compressor (11), wherein the air compressor (11) is arranged in the hull (100), and the air compressor (11) is used to generate the bubbles.

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

6. The ship bubble drag reduction detection device according to claim 5, characterized in that: The bubble generating unit (1) further comprises an air pressure controller (13), wherein the air pressure controller (13) is connected between the air compressor (11) and the bubble spreading mechanism (12).

7. The ship bubble drag reduction detection device according to claim 1, characterized in that: The light source emitting unit (2) comprises a laser (21), the laser (21) being installed at the bottom of the hull (100), and the laser (21) being capable of emitting laser light toward the bubble attachment area (110).

8. The ship bubble drag reduction detection device according to claim 7, characterized in that: The light source emitting unit (2) further comprises a light source reflector (22), the laser (21) can emit laser light to the light source reflector (22), and the light source reflector (22) can reflect the laser light to the bubble attachment area (110).

9. A ship, characterized in that: It comprises a hull (100) and a ship bubble drag reduction detection device according to any one of claims 1 to 8, wherein the ship bubble drag reduction detection device is arranged at the bottom of the hull (100).

10. The ship according to claim 9, characterized in that: The ship is provided with a plurality of the ship bubble drag reduction detection devices, and the plurality of the ship bubble drag reduction detection devices are arranged at the bottom of the hull (100) along the advancing direction of the ship.

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