Intelligent lift force enhancing device for hydrofoil ship based on slippage regulation and control

Abstract

The invention relates to a hydrofoil ship lift force intelligent enhancing device based on slippage regulation and control, which comprises a hydrofoil, the surface of the hydrofoil is covered with a thermal response super-hydrophobic material, the hydrofoil is of a hollow structure, the lower part of the hydrofoil is provided with a speed slippage intelligent regulation and control device, and the speed slippage intelligent regulation and control device comprises a temperature control device and a hydrofoil sensor. The temperature control device is respectively connected with the power supply line, the signal line and the control circuit, the power supply line is connected with the circuit connector arranged at the left end of the hydrofoil sensor, and the signal line is connected with the signal connector arranged at the right end of the hydrofoil sensor. The lift force of the hydrofoil can be intelligently enhanced, the lift force of the hydrofoil is enhanced, the stability of a hydrofoil ship is improved, and the lift force regulation and control operation process is simplified.

Description

Technical Field

[0001] The present invention relates to the field of ship hydrodynamics, and more specifically to an intelligent lift enhancement device for hydrofoil vessels based on slip regulation. Background Art

[0002] A hydrofoil is a vessel that uses hydrofoils to lift the hull and reduce water resistance, and can travel at a higher speed on the water. They are widely used in shipping, tourism, and military fields. Today's hydrofoil vessels are mainly used for offshore navigation, with a small load capacity and limited means of lift enhancement. The load capacity of a hydrofoil vessel can be increased by increasing the lift of the hydrofoil. Currently, the main methods for changing lift are to adjust the angle of attack of the hydrofoil and the speed of the hydrofoil vessel. The vertical upward force generated by the hydrofoil in the flow is the lift, which affects the speed, stability, maneuverability and safety of the hydrofoil vessel. Traditional hydrofoil designs include fixed hydrofoils (suitable for slow ships), adjustable hydrofoils (flexible to adapt to sailing conditions) and retractable hydrofoils (folded up at low speeds to reduce resistance and unfolded at high speeds to increase lift). Lift forms a low-pressure area through the difference in water flow speed and can be adjusted by adjusting the angle of the hydrofoil, but the lifting effect is still relatively limited. When the ship speed increases, the lift increases, but too high a speed will cause bubbles on the surface of the hydrofoil, reducing sailing stability and increasing the risk of capsizing. There are certain difficulties and challenges in significantly increasing lift by changing the angle of attack and the speed of the ship. Therefore, it is very important to develop a new type of intelligent and efficient lift enhancement device to improve the performance of hydrofoil ships. (Sheng Zhenbang, Liu Yingzhong. Principles of Ships [J]. 2004.)

[0003] Emerging surface treatment technologies can effectively change the flow field distribution state near the wall, thereby affecting the force characteristics of the object. The surface wettability of a thermally responsive wettable material can be precisely controlled by controlling the surface temperature of the material, and the surface flow field distribution changes continuously with the wettability of the surface material. The control principle of smart materials is mainly based on the material's ability to respond to external stimuli, including the following aspects: 1. Stimulus response mechanism: Smart materials trigger internal mechanisms to change their physical or chemical properties by sensing external stimuli (such as temperature, light, pressure or electric field). 2. Feedback control system: Smart materials are often combined with sensors and control systems to form a closed-loop feedback loop, monitor environmental changes in real time and automatically adjust material properties to optimize functions. 3. Adaptive characteristics: The material structure is adjustable and can automatically adjust its own state according to environmental changes, such as piezoelectric materials generating electrical signals when mechanical pressure is applied. At present, this technology has not been applied to hydrofoils. (Jiang L, Feng L. Bioinspired intelligent nanostructured interfacial materials [M]. World Scientific, 2010.)

[0004] There are certain limitations to increasing lift by deflecting the hydrofoil and increasing the ship speed. First, when the hydrofoil is deflected to a certain angle, the lift cannot be further increased; second, when the ship speed reaches a certain level, cavitation will occur on the surface of the hydrofoil, which not only affects the stability of the hydrofoil ship, but also consumes more resources when sailing at high speed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a hydrofoil craft lift intelligent enhancement device based on slip control, which can improve the stability of the hydrofoil craft, simplify the lift control operation process, and can intelligently enhance the lift of the hydrofoil, so that the hydrofoil craft tends to a stable state when sailing.

[0006] The technical solution adopted by the present invention to solve its technical problems is: constructing a hydrofoil ship lift intelligent enhancement device based on slip control, including a hydrofoil, the surface of which is covered with a thermally responsive super-hydrophobic material, the hydrofoil is a hollow structure and a speed slip intelligent control device is arranged at the bottom.

[0007] According to the above scheme, the speed slip intelligent control device includes a temperature control device and a hydrofoil sensor. The temperature control device is respectively connected to the power supply line, the signal line and the control circuit. The power supply line is connected to the circuit connection port arranged at the left end of the hydrofoil sensor, and the signal line is connected to the signal connection port arranged at the right end of the hydrofoil sensor.

[0008] According to the above scheme, the hydrofoil sensor includes a temperature sensor, a pressure sensor and a speed sensor. The temperature sensor and the pressure sensor are arranged on the surface layer of the superhydrophobic material on the upper surface of the hydrofoil. The temperature sensor is arranged on the lower surface of the hydrofoil. A heating plate is arranged at the lower part of the hydrofoil. A plurality of heating copper tubes are laid in the heating plate. An insulation layer is arranged at the lower part of the heating plate.

[0009] According to the above scheme, the temperature control device controls the heating plate to heat the hydrofoil, and obtains the temperature information of the hydrofoil through the temperature sensor. The speed slip intelligent control device adjusts the surface temperature of the hydrofoil through the temperature control device based on the temperature information, and adjusts the speed slip size of the hydrofoil surface by adjusting the temperature.

[0010] According to the above scheme, after the heating copper tube under the hydrofoil plate is heated, heat is transferred through the hydrofoil plate to change the temperature of the superhydrophobic material, thereby changing the surface free energy of the thermally responsive superhydrophobic material, and then changing the surface wettability of the thermally responsive superhydrophobic material, controlling the velocity slip distribution on the hydrofoil surface, and realizing the conversion of the thermally responsive superhydrophobic material set on the surface of the hydrofoil from a hydrophilic surface to a hydrophobic surface by changing the temperature of the superhydrophobic material.

[0011] According to the above solution, the left and right ends of the hydrofoil plate, the heating plate and the heat insulation plate are fixedly connected.

[0012] According to the above scheme, the lift force on the hydrofoil is composed of the vertical force of the flow field on the fluid when the hydrofoil flows in the fluid and the component of the hydrofoil surface resistance in the vertical direction. The force of the fluid on the hydrofoil when the hydrofoil acts in the fluid is calculated by the following formula:

[0013]

[0014] L: lift (N),

[0015] ρ: density of the fluid (kg / m 3 ),

[0016] V: relative velocity of the fluid on the hydrofoil surface (m / s),

[0017] S: Reference area of ​​hydrofoil (m 2 ), usually the projected area of ​​the hydrofoil,

[0018] C L : Lift coefficient, which depends on the shape of the hydrofoil, the angle of attack and the flow state, and is given by CFD calculations.

[0019] The resistance of the hydrofoil to the fluid flow is calculated using the following formula:

[0020] The total resistance formula is:

[0021] D=D f +D p

[0022] D represents the total resistance (N),

[0023] D f represents the friction resistance (N),

[0024] D p represents the pressure difference resistance (N),

[0025] Frictional resistance is caused by the friction between the water flow and the surface of the hydrofoil. The frictional resistance is calculated by the following formula:

[0026]

[0027] D: Friction resistance (N),

[0028] ρ: density of the fluid (kg / m 3 ),

[0029] v: relative velocity of the fluid on the hydrofoil surface (m / s),

[0030] S: Reference area of ​​hydrofoil (m 2 ), usually the projected area of ​​the hydrofoil,

[0031] C D : Drag coefficient, which depends on the shape of the hydrofoil, the angle of attack and the flow state, and is given by CFD calculations.

[0032] According to the above scheme, the thermally responsive superhydrophobic material is polyisopropylacrylamide.

[0033] The intelligent lift enhancement device for hydrofoil vessels based on slip control according to the present invention has the following beneficial effects:

[0034] 1. The present invention implements intelligent control of the lift of the hydrofoil based on regulating the slip distribution of the hydrofoil surface velocity. On the basis of traditional hydrofoil lift control, the present invention uses super-hydrophobic materials and an intelligent control system to achieve precise intelligent control of the lift of the hydrofoil, thus solving the lift enhancement problem.

[0035] 2. The intelligent lift enhancement device of the present invention can be used not only for surface transportation devices but also for underwater vehicles. The device can enhance the lift of surface vehicles, reduce the energy consumption of surface vehicles during navigation, and increase the speed of corresponding vehicles during navigation;

[0036] 3. The intelligent lift enhancement device of the present invention has broad application prospects in multiple fields. It can promote the development of related industries by improving performance, improving safety and improving efficiency. With the continuous advancement of technology, more innovative application scenarios may appear in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 It is a schematic diagram of the hull structure of the present invention;

[0039] Figure 2 is a schematic diagram of the cross-sectional structure of the hydrofoil of the present invention;

[0040] Figure 3 It is a schematic diagram of the installation of the temperature control device of the present invention;

[0041] Figure 4 The present invention Figure 2 Schematic diagram of the structural layers of the dotted line part;

[0042] Figure 5 is a flow chart of the operation of the basic lift control device of the present invention;

[0043] In the figure: 1. lower surface of hydrofoil, 2. bolt gasket, 3. insulation layer, 4. circuit connection port, 5. hydrofoil plate, 6. heating plate, 7. speed sensor, 8. pressure sensor, 9. temperature sensor, 10. bolt, 11. nut, 12. signal connection port, 13. temperature control device, 14. control circuit, 15. heating copper tube, 16. power supply line, 17. signal line, 18. hull structure, 19. hydrofoil structure. DETAILED DESCRIPTION

[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0045] like Figure 1-5 As shown, the intelligent lift enhancement device for hydrofoil craft based on slip control of the present invention includes a hydrofoil, the surface of the hydrofoil is covered with a thermally responsive superhydrophobic material, the hydrofoil is a hollow structure and a speed slip intelligent control device is arranged at the bottom. The thermally responsive superhydrophobic material is covered on the surface of the hydrofoil to control the flow field distribution on the surface of the hydrofoil, thereby enhancing the lift of the hydrofoil and ensuring the stability and safety of the hydrofoil structure. The hydrophobicity of the thermally responsive superhydrophobic material is affected by temperature, and the hydrophobicity of the material will change at different temperatures, thereby controlling the speed slip distribution on the surface of the hydrofoil. The speed slip intelligent control device dynamically adjusts the angle and position of the hydrofoil according to the working state of the hydrofoil and the environment in which it is located, thereby optimizing the lift of the hydrofoil.

[0046] The speed slip intelligent control device includes a temperature control device 13 and a hydrofoil sensor. The temperature control device 13 is connected to a power supply line 16, a signal line 17 and a control circuit 14 respectively. The power supply line 16 is connected to a circuit connection port 4 arranged at the left end of the hydrofoil sensor, and the signal line 17 is connected to a signal connection port 12 arranged at the right end of the hydrofoil sensor. The hydrofoil sensor includes a temperature sensor 9, a pressure sensor 8 and a speed sensor 7. The temperature sensor 9 and the pressure sensor 8 are arranged on the surface layer of the super-hydrophobic material on the upper surface of the hydrofoil. The temperature sensor 9 is arranged on the lower surface 1 of the hydrofoil. A heating plate 6 is arranged at the lower part of the hydrofoil. A plurality of heating copper tubes 15 are laid in the heating plate 6. A heat insulation layer 3 is arranged at the lower part of the heating plate 6. The temperature control device 13 controls the heating plate 6 to heat the hydrofoil, and obtains the temperature information of the hydrofoil through the temperature sensor 9. The speed slip intelligent control device adjusts the surface temperature of the hydrofoil through the temperature control device 13 based on the temperature information, and adjusts the speed slip size of the hydrofoil surface by adjusting the temperature. The water flow velocity information on the hydrofoil surface is obtained by the speed sensor 7 on the hydrofoil surface and fed back to the speed slip intelligent control device. The speed slip intelligent control device changes the surface temperature of the hydrofoil and then changes the surface speed slip, thereby enhancing the lift of the hydrofoil.

[0047] The thermal responsive super-hydrophobic material changes the surface free energy of the thermal responsive super-hydrophobic material by changing the temperature of the super-hydrophobic material, thereby changing the surface wettability of the thermal responsive super-hydrophobic material, controlling the velocity slip distribution on the hydrofoil surface, and realizing the conversion of the thermal responsive super-hydrophobic material arranged on the surface of the hydrofoil from a hydrophilic surface to a hydrophobic surface by changing the temperature of the super-hydrophobic material. The hydrofoil plate 5, the heating plate 6 and the left and right ends of the thermal insulation layer 3 are all fixedly connected.

[0048] The hydrofoil is made of lightweight and high-quality materials to improve the strength of the hydrofoil and reduce the mass of the hydrofoil. The hydrofoil's shape design selects a suitable airfoil to optimize the lift and resistance of the hydrofoil. The internal structure of the hydrofoil is hollow, which is used to place circuits and other devices necessary for controlling the slip distribution. On the premise of ensuring the stability of the hydrofoil structure, the hydrofoil surface is covered with super-hydrophobic material, and a temperature control device 13 and a heating device are installed inside. In order to reduce the influence of the flow field distribution on the surface of the sensor hydrofoil, a guide cover is installed near the sensor. The thermally responsive super-hydrophobic material is covered on the surface of the hydrofoil. The surface wettability of the material is affected by the temperature of the environment. When the temperature is low, the material exhibits hydrophilicity. As the temperature increases, the surface wettability of the material changes, from hydrophilicity to hydrophobicity, so that the surface speed slip of the hydrofoil on this side increases, so that a speed difference is formed between the upper and lower surfaces of the hydrofoil, and the lift force on the hydrofoil is changed.

[0049] In a preferred embodiment of the present invention, a hydrofoil, a thermally responsive superhydrophobic material and an established speed-slip intelligent control device are included.

[0050] The structural design of the hydrofoil meets the speed, stability, and load-bearing capacity performance requirements in its use scenario. Therefore, the hydrofoil adopts a hollow structure to install a device for controlling the surface temperature of the hydrofoil and a circuit for receiving surface sensor signals. The thickness of the hydrofoil needs to be reduced as much as possible while meeting the strength requirements to facilitate heat transfer and control the surface temperature of the hydrofoil. The temperature control method of the hydrofoil surface is: the temperature control device 13 controls the heating plate 6 to heat the hydrofoil, and the temperature sensor 9 installed on the lower surface 1 of the hydrofoil obtains the temperature information of the hydrofoil. The speed slip intelligent control device adjusts the surface temperature of the hydrofoil through the temperature control device 13 based on the temperature information, and adjusts the speed slip size of the hydrofoil surface by adjusting the temperature.

[0051] The mechanism of action of using thermally responsive super-hydrophobic materials is: by changing the temperature of the hydrofoil surface, the surface free energy of the thermally responsive super-hydrophobic material is changed, and then the surface wettability of the thermally responsive super-hydrophobic material is changed, and the surface velocity slip distribution of the hydrofoil is controlled. When the surface temperature of the hydrofoil is below 29°, the surface contact angle of the material is 0°. When the surface temperature of the hydrofoil is around 40°, the surface contact angle of the material is 150°. By changing the temperature of the super-hydrophobic material, the surface material can be transformed from a hydrophilic surface to a hydrophobic surface.

[0052] Thermoresponsive superhydrophobic materials are polyisopropylacrylamide, polymer glue or methyltriethoxysilane. Polyisopropylacrylamide (PNIPAAm) is a thermoresponsive polymer with excellent performance and a low critical solution temperature. The properties exhibited on different substrates are different. For example, on a glass substrate, it is hydrophilic when the glass surface temperature is less than 30°C, and hydrophobic when the glass surface temperature is greater than 40°C. On a smooth silicon substrate, it is hydrophilic at a temperature of 25°C and hydrophobic above 40°C. This change in surface wettability is reversible and can change with temperature. Polymer glue (also known as hydrogel) can respond to external stimuli such as pH, temperature changes, and special chemical substrates, thereby expanding or contracting by absorbing or expelling water between its cross-linked polymer chains. In addition to thermosensitive polymers, rigid foam materials also have thermoresponsive wettability changes. Methyltriethoxysilane has super hydrophobicity after calcination at 390℃ and cooling, while it has super hydrophilicity after calcination at 400℃ and cooling. This change in wettability within a very narrow temperature range is caused by both the surface structure and the surface chemical composition. On the one hand, triethoxysilane can hydrolyze and condense in a mixed solution of organic solvent and water to form a porous structure of the bulk phase; on the other hand, the increase in temperature causes the redistribution of the surface organic groups, resulting in some hydrophilic groups being exposed on the surface.

[0053] The speed slip condition is characterized by the surface velocity and pressure information of the hydrofoil obtained by the sensor. The lift force on the hydrofoil is calculated by the following formula. The lift force on the hydrofoil is composed of the vertical force of the flow field on the fluid when the hydrofoil flows in the fluid and the vertical component of the hydrofoil surface resistance. The force of the fluid on the hydrofoil when the hydrofoil acts in the fluid is calculated by the following formula.

[0054]

[0055] L: lift (N);

[0056] ρ: density of the fluid (kg / m 3 );

[0057] V: relative velocity of the fluid on the hydrofoil surface (m / s);

[0058] S: Reference area of ​​hydrofoil (m 2 ), usually the projected area of ​​the hydrofoil;

[0059] C L : lift coefficient, which depends on the shape of the hydrofoil, the angle of attack and the flow state, and is given by CFD calculation;

[0060] The resistance of the fluid to which the hydrofoil is subjected when flowing in the fluid is calculated using the following formula.

[0061] The total resistance formula is:

[0062] D=D f +D p

[0063] D represents the total resistance (N); D f represents friction resistance (N); D p Represents the pressure difference resistance (N).

[0064] Frictional resistance is usually caused by the friction between the water flow and the surface of the hydrofoil. The pressure difference resistance can be ignored relative to the frictional resistance at low speeds. The frictional resistance is calculated by the following formula:

[0065]

[0066] D: Friction resistance (N);

[0067] ρ: density of the fluid (kg / m 3 );

[0068] v: relative velocity of the fluid on the hydrofoil surface (m / s);

[0069] S: Reference area of ​​hydrofoil (m 2 ), usually the projected area of ​​the hydrofoil;

[0070] C D : Drag coefficient, which depends on the shape of the hydrofoil, the angle of attack and the flow state, and is given by CFD calculation;

[0071] A database is established through numerical simulation to simulate the various coefficients of the hydrofoil in actual application scenarios. The drag coefficient and lift coefficient can be obtained from the database. The lift force on the hydrofoil is calculated using the above formula and compared with the simulation data to evaluate the hydrophobic performance of the smart material on the hydrofoil surface. According to the control requirements, the hydrofoil state is appropriately adjusted. When the vehicle is sailing smoothly, the intelligent control system changes the wettability of the thermally responsive superhydrophobic material on the surface of the hydrofoil according to the speed sliding intelligent control device and the speed distribution on the surface of the hydrofoil, thereby intelligently balancing the lift on both sides of the hydrofoil, so that the underwater vehicle can sail smoothly. According to Bernoulli's principle, the greater the speed, the smaller the pressure. When the fluid speed increases, the lift increases; when the fluid speed decreases, the pressure decreases, thereby achieving an increase in lift. During the deflection of the hydrofoil, the speed sliding intelligent control device intelligently controls the wettability of the superhydrophobic material on the surface of the hydrofoil, changes the wettability of the hydrofoil surface, thereby affecting the flow field distribution near the hydrofoil, and then changes the lift force on the hydrofoil. When the hydrofoil is sailing at high speed, cavitation may occur on the surface. The pressure sensor 8 can be used to detect the distribution of bubbles on the surface of the hydrofoil. The distribution of bubbles can be regulated by changing the wettability of the hydrofoil surface. First, a hydrophilic surface is constructed to inhibit cavitation; second, a hydrophobic surface is constructed to induce the fusion of cavitation bubbles, avoid or reduce the collapse of cavitation bubbles, and reduce the impact of cavitation.

[0072] The operation process of the present invention is as follows:

[0073] When the lift size needs to be changed, the control panel sends a control command to the internal intelligent control system, and the intelligent control system intelligently adjusts the hydrofoil angle of attack and the hydrofoil surface temperature. The intelligent control system adjusts the hydrofoil temperature by controlling the temperature control device 13, and intelligently controls the hydrofoil surface temperature through the hydrofoil surface temperature sensor 9, thereby changing the hydrofoil surface speed slip size, and changing the hydrofoil surface and fluid relative speed size. The hydrofoil surface speed and pressure sensor 8 transmits the hydrofoil surface speed and pressure information to the intelligent control system in real time, and the intelligent control system dynamically adjusts the hydrofoil angle of attack and surface temperature size based on the hydrofoil state. The intelligent control system can ensure stable operation under load changes or external interference, avoid speed fluctuations, and respond quickly when the speed needs to be adjusted. When the set speed and pressure change, the output can be adjusted in time, and the speed can be accurately adjusted to ensure that the deviation between the actual speed and pressure and the set value is minimized. Based on the database established by the simulation experiment, the intelligent control system automatically adjusts the control strategy to improve performance, and can predict future speed and pressure requirements and perform pre-control based on historical data and real-time monitoring information.

[0074] The installation steps of the present invention are:

[0075] In actual work, when installing sensors on the upper surface of the hydrofoil, it should be noted that the installation position should be as close to the hydrofoil surface as possible to ensure accurate speed data. At the same time, interference caused by other equipment or structures nearby should be avoided to ensure the measurement accuracy of the sensor. Therefore, when installing the sensor, it is fixed on the surface of the hydrofoil through a mounting bracket or adhesive. When installing the sensor, the sensor angle should be kept horizontal or perpendicular to the hydrofoil surface as much as possible to reduce the error generated during measurement. After installation, it is fixed on the surface of the hydrofoil and firmly installed in the designated position using a reasonable fixing method to prevent loosening due to vibration or water flow during use. At the same time, in order to reduce the corrosion of the sensor by water flow, the sensor surface should be fixed and sealed with anti-corrosion materials to extend the service life of the equipment. Speed ​​sensor 7 and pressure sensor 8 are installed at the leading edge, trailing edge and upper surface of the hydrofoil board. Temperature sensor 9 is installed on the lower surface 1 of the hydrofoil to monitor the temperature of the hydrofoil board. The area of ​​the hydrofoil surface that needs to be heated is large. When the internal heating plate 6 is set, the heating plate 6 is designed to fit the shape of the lower surface 1 of the hydrofoil. Bolts 10 are welded on the lower surface 1 of the hydrofoil to fix the heating plate 6 and the insulation layer 3. After the bolts 10, the heating plate 6 and the insulation layer 3 are installed in place, they are fixed with nuts 11 to prevent the positions of the heating plate 6, the insulation layer 3 and the hydrofoil plate 5 from changing during actual use, which may affect the normal use of the device. During the installation process, a bolt gasket 2 is added to the connection between the hydrofoil plate 5 and the heating plate 6, and the heating plate 6 and the insulation layer 3 bolts 10 to enhance the stability of the plate and limit its displacement. The bolt gasket 2 needs to be able to withstand the high temperature of the heating plate 6 and have good elastic properties. The hydrofoil heating plate 6 is heated by the heating copper tube 15 in the heating plate 6. The temperature control device 13 supplies power to the copper tube in the heating plate 6 through the power supply line 16 and the power connection port 4 for heating, and obtains the temperature information of the temperature sensor 9 on the lower surface 1 of the hydrofoil through the signal line 17 to connect the signal connection port 12 to control the temperature of the hydrofoil plate. The lower surface 1 of the hydrofoil is arranged in the same manner as the upper surface of the hydrofoil, and the temperature control device 13 is installed between the upper and lower surfaces.

[0076] When the lift of the hydrofoil needs to be increased, the lift increase command is issued through the control console, and the intelligent control system controls the surface temperature of the hydrofoil through the temperature sensor 9 to adjust the wettability of the upper and lower surfaces of the hydrofoil. Reduce the upper surface temperature, thereby reducing the upper surface contact angle, increase the lower surface temperature, thereby increasing the lower surface contact angle, change the speed difference between the upper and lower surfaces of the hydrofoil, and change the pressure difference on both sides by changing the speed difference between the upper and lower surfaces of the hydrofoil. The actual working state of the hydrofoil in the flow field is obtained through the speed and pressure sensor 8 on the surface of the hydrofoil. With the help of the database established by simulation, the intelligent control mechanism is controlled in real time, thereby realizing the lift enhancement under various working environments.

[0077] Working principle of the present invention:

[0078] By utilizing the characteristics of thermally responsive super-hydrophobic materials, the temperature of the super-hydrophobic materials is instantly changed through the speed slip intelligent control device, the flow field distribution around the hydrofoil is changed, and the lift of the hydrofoil is enhanced. When the lift of the hydrofoil needs to be enhanced, the speed sensor 7 on the surface of the hydrofoil obtains the surface speed information of the hydrofoil and transmits it to the intelligent control system. The intelligent control system calculates the required temperature for the slip of the hydrofoil surface through the control algorithm, and heats the surface of the hydrofoil through the heating copper tube 15 inside the hydrofoil to increase the contact angle of the super-hydrophobic material on the surface of the hydrofoil, and increase the relative flow rate between the surface of the hydrofoil and the fluid. According to the Bernoulli principle of flow rate, the increase in speed will cause the pressure to decrease, forming lift. At the same time, the temperature sensor 9 on the lower surface of the hydrofoil 1 monitors the temperature information of the hydrofoil in real time and feeds back to the temperature control device. When the required temperature is reached, the heating is stopped. When the flow velocity near the hydrofoil increases, the cavitation phenomenon on the surface of the hydrofoil is avoided or reduced. On the one hand, since the cavitation phenomenon is effectively controlled under high-speed conditions, the allowable speed of the hydrofoil ship can be greatly increased, thereby achieving lift enhancement. On the other hand, when the required lift is constant, the lift can be effectively increased, and the share of lift contributed by the speed increase is reduced, so the speed required for the hydrofoil ship to operate can be effectively reduced. Studies have shown that the energy consumption of hydrofoil ships is proportional to the square of the ship speed. It can be seen that this device can effectively reduce the energy consumption of ships and help implement the "dual carbon strategy".

[0079] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A hydrofoil lift intelligent enhancement device based on slip control, characterized in that: It comprises a hydrofoil, the surface of which is covered with a thermally responsive super-hydrophobic material, the hydrofoil is a hollow structure and a speed sliding intelligent control device is arranged at the bottom.

2. The intelligent lift enhancement device for hydrofoil vessels based on slip control according to claim 1 is characterized in that: The speed slip intelligent control device includes a temperature control device and a hydrofoil sensor. The temperature control device is respectively connected to a power supply line, a signal line and a control circuit. The power supply line is connected to a circuit connection port arranged at the left end of the hydrofoil sensor, and the signal line is connected to a signal connection port arranged at the right end of the hydrofoil sensor.

3. The intelligent lift enhancement device for hydrofoil vessels based on slip control according to claim 2 is characterized in that: The hydrofoil sensor includes a temperature sensor, a pressure sensor and a speed sensor. The temperature sensor and the pressure sensor are arranged on the surface layer of the super-hydrophobic material on the upper surface of the hydrofoil. The temperature sensor is arranged on the lower surface of the hydrofoil. A heating plate is arranged at the lower part of the hydrofoil. A plurality of heating copper tubes are laid in the heating plate. An insulation layer is arranged at the lower part of the heating plate.

4. The intelligent lift enhancement device for hydrofoil vessels based on slip control according to claim 3 is characterized in that: The temperature control device controls the heating plate to heat the hydrofoil, and obtains the temperature information of the hydrofoil through the temperature sensor. The speed slip intelligent control device adjusts the surface temperature of the hydrofoil through the temperature control device based on the temperature information, and adjusts the speed slip size of the hydrofoil surface by adjusting the temperature.

5. The hydrofoil lift intelligent enhancement device based on slip control according to claim 4 is characterized in that: After the heating copper tube under the hydrofoil plate is heated, heat is transferred through the hydrofoil plate to change the temperature of the super-hydrophobic material, thereby changing the surface free energy of the thermally responsive super-hydrophobic material, thereby changing the surface wettability of the thermally responsive super-hydrophobic material, controlling the velocity slip distribution on the hydrofoil surface, and realizing the conversion of the thermally responsive super-hydrophobic material set on the surface of the hydrofoil from a hydrophilic surface to a hydrophobic surface by changing the temperature of the super-hydrophobic material.

6. The hydrofoil lift intelligent enhancement device based on slip control according to claim 3 is characterized in that: The left and right ends of the hydrofoil plate, the heating plate and the heat insulation plate are all fixedly connected.

7. The intelligent lift enhancement device for hydrofoil vessels based on slip control according to claim 1 is characterized in that: The lift force on the hydrofoil is composed of the vertical force of the flow field on the fluid when the hydrofoil flows in the fluid and the vertical component of the hydrofoil surface resistance. The force of the fluid on the hydrofoil when the hydrofoil acts in the fluid is calculated using the following formula: L: lift (N), ρ: density of the fluid (kg / m 3 ), V: relative velocity of the fluid on the hydrofoil surface (m / s), S: Reference area of ​​hydrofoil (m 2 ), usually the projected area of ​​the hydrofoil, C L : Lift coefficient, which depends on the shape of the hydrofoil, the angle of attack and the flow state, and is given by CFD calculations. The resistance of the hydrofoil to the fluid flow is calculated using the following formula: The total resistance formula is: D=D f +D p D represents the total resistance (N), D f represents the friction resistance (N), D p represents the pressure difference resistance (N), Frictional resistance is caused by the friction between the water flow and the surface of the hydrofoil. The frictional resistance is calculated by the following formula: D: Friction resistance (N), ρ: density of the fluid (kg / m 3 ), v: relative velocity of the fluid on the hydrofoil surface (m / s), S: Reference area of ​​hydrofoil (m 2 ), usually the projected area of ​​the hydrofoil, C D : Drag coefficient, which depends on the shape of the hydrofoil, the angle of attack and the flow state, and is given by CFD calculations.

8. According to the hydrofoil boat lift intelligent enhancement device based on slip control according to claim 1, the thermally responsive super-hydrophobic material is polyisopropylacrylamide.

Images