Ship resistance reduction system

Abstract

According to the ship resistance reducing system, the high-pressure seawater spraying module is installed below the waterline of the ship, a large number of flat capillary nozzles in the module are used for spraying high-speed water flow to the rear portion of the ship, and a very thin water film flowing backwards at a high speed is formed below the waterline; the seawater resistance borne by the ship during sailing can be greatly reduced by utilizing the water film. The high-pressure seawater spraying module is formed by combining a plurality of modules, is similar to wall bricks, is connected through butt-joint openings and is adhered to the position below a ship waterline. The appearance of the ship does not need to be changed, and the device can be conveniently installed on an existing ship shell. Under the condition that the thrust of the propellers is not changed, the running speed of the ship is related to the backward flowing speed of the water film, when the speeds are equal, the seawater resistance borne by the ship is close to zero, no seawater resistance exists, and the ship can run at a high speed under the action of very small thrust.

Description

[0001] 1. Name: A ship drag reduction system.

[0002] 2. Technical field: The present invention mainly relates to the military and water transportation fields, and in particular to a new type of ship drag reduction system, which can be used for large ships such as aircraft carriers, warships, and cargo ships to reduce seawater resistance and increase speed.

[0003] 3. Background technology: The present invention is derived from the consideration of the problem of seawater resistance when a ship is sailing. When a ship is sailing in the water, the power required to overcome the seawater resistance is proportional to the square of its speed, that is, if the sailing speed doubles, the power required will increase to 4 times the original. High-speed sailing requires very high power and consumes a lot of energy. It is becoming increasingly difficult to increase the speed by increasing the engine power. Therefore, reducing the seawater resistance encountered by the ship when sailing is an effective way to increase the speed of the ship.

[0004] 4. Content of the invention: The present invention designs a ship resistance reduction system, which installs a high-pressure seawater jet module below the waterline of the ship, and uses a large number of flat capillary nozzles in the module to spray high-speed water flow to the rear of the ship, forming a very thin layer of high-speed backward-flowing water film below the waterline. This water film can greatly reduce the seawater resistance encountered by the ship during navigation. The high-pressure seawater jet module is composed of a plurality of modules, which are connected through docking ports similar to wall bricks and pasted below the waterline of the ship. It does not need to change the shape of the ship, and can be easily installed on the existing ship hull. When the propeller thrust remains unchanged, the ship's speed is related to the backward flow speed of the water film. When the speeds are equal, the seawater resistance encountered by the ship is close to zero. Without the resistance of seawater, the ship can achieve high-speed travel under very small thrust.

[0005] 5. The technical solution adopted by the present invention is: the seawater is compressed by the ship's power to form high-pressure seawater, and the high-pressure seawater is supplied to the high-pressure seawater injection module through a pipeline. The high-pressure seawater module sprays toward the rear of the ship through a large number of flat capillary nozzles, forming a very thin layer of water film flowing backwards below the waterline of the ship. The faster the water film flows backwards, the smaller the seawater resistance the ship encounters when traveling. The problem of huge resistance when the ship is traveling at high speed is solved by the high-speed flowing water film. When the backward flow speed of the water film is equal to the speed of the ship, the seawater resistance the ship encounters is close to zero; when the backward flow speed of the water film is greater than the speed of the ship, the water film can provide additional power for the ship to move forward; when the backward flow speed of the water film is less than the speed of the ship, the ship encounters seawater resistance. The faster the water film flows backwards, the smaller the seawater resistance the ship encounters.

[0006] 6. Compared with the prior art, the beneficial effects of the present invention are as follows: the high-pressure seawater injection module sprays high-pressure seawater to the rear of the ship through a huge number of flat capillary nozzles, covering the surface below the waterline of the ship with a layer of water film flowing backward at high speed, effectively reducing the resistance of the seawater and increasing the speed of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 : Working principle diagram

[0008] Figure 2 : Schematic diagram of high-pressure seawater injection module

[0009] Figure 3 : Schematic diagram of overall structural layout DETAILED DESCRIPTION

[0010] 1. System overall structure design and working principle

[0011] like Figure 1 As shown in the working principle diagram, the whole system consists of two parts: a high-pressure seawater generation module and a high-pressure seawater injection module.

[0012] 1. High-pressure seawater generation module: It consists of a seawater purification system, a pressure pump, a high-pressure water storage tank, a high-pressure gas storage tank, etc.

[0013] The seawater purification system consists of a water inlet, a grid plate, a purification filter element, etc. The grid plate isolates the seawater organisms, and the purification filter element filters out micro-debris to obtain clean seawater without debris.

[0014] The booster pump is powered by the ship's power system. The function of the booster pump is to pressurize the seawater, and the pressurized seawater is ejected through the flat capillary nozzle through the pipeline. Because the ship's drag reduction system is to reduce the resistance of seawater to the ship, it does not need to provide additional forward power. The main power is still the propeller at the tail of the ship. Therefore, the pressurized seawater does not need to be at a particularly high pressure, and the power of the booster pump does not need to be particularly high. It only needs to provide a sufficient amount of high-pressure seawater.

[0015] High-pressure water storage tanks store pressurized high-pressure seawater. Because the compression of water is relatively small, the pressure will drop rapidly after a small amount of seawater is released. Therefore, a high-pressure air storage tank is needed to utilize the high compression ratio of air and maintain the high pressure of the seawater in the high-pressure water storage tank through a pressure regulating valve, so that the pressure is maintained within a certain range.

[0016] The high-pressure seawater in the high-pressure water storage tank passes through the pressure regulating valve and is supplied to the high-pressure seawater main pipeline at a relatively stable pressure. The main pipeline then supplies the high-pressure seawater injection module through the regional water supply pipeline. The high-pressure seawater injection module sprays the high-pressure seawater through a huge number of flat capillary nozzles, forming a layer of water film flowing backwards at a high speed on the surface below the waterline of the ship.

[0017] 2. High-pressure seawater injection module: It consists of a docking port, a main water supply pipe, a branch water supply pipe, a capillary nozzle, etc.

[0018] like Figure 2 As shown in the schematic diagram of the high-pressure seawater injection module, each high-pressure seawater injection module is composed of multiple flat capillary nozzles, and the modules are connected by docking ports. Multiple high-pressure seawater injection modules are similar to wall bricks, which are connected one by one and laid on the surface below the waterline of the ship. The flat capillary nozzle opens backward and can spray high-pressure and high-speed seawater to form a water film.

[0019] The capillary nozzle is flat, and it looks like a very thin gap from the front. High-pressure seawater is ejected outward through this very thin gap, thus forming a water film that flows backward at high speed. The water films generated by a huge number of flat capillary nozzles are connected together to form a large area of ​​connected water films, covering the position below the waterline of the ship.

[0020] The regional pressure regulating valve is controlled by a computer, and water is supplied to each high-pressure seawater injection module through the regional pressure regulating valve and the regional water supply pipeline. The pressure balance of each area can be maintained by separate control.

[0021] 2. System Working Process

[0022] like Figure 3 As shown in the schematic diagram of the overall structural layout, seawater enters the ship through the front water inlet. The grid plate installed at the water inlet isolates fish and other marine organisms. Marine organisms rush to the side and rear along most of the water flow. Part of the seawater enters the seawater purification system to filter out small debris in the water to obtain relatively pure seawater and prevent debris from clogging the capillary nozzle. The purified seawater flows through the booster pump and is pressed into the high-pressure water storage tank by the booster pump. With the assistance of the high-pressure air storage tank, the high-pressure seawater is transported to the high-pressure seawater injection module through the high-pressure water supply pipeline. The high-pressure seawater injection module sprays high-pressure and high-speed seawater toward the stern, forming a layer of water film flowing backward at high speed.

[0023] 3. Existing Problems and Solutions

[0024] 1. Structural design of the nozzle: The larger the nozzle cross-sectional area, the greater the water demand. In order to reduce water consumption, the nozzle cross-sectional area needs to be reduced as much as possible. The nozzle structure, shape, size and other parameters require complex calculations and repeated experiments, and need to be solved by professionals.

[0025] 2. Because a water jet speed of more than 50m / s will generate a lot of cavitation, which will reduce the buoyancy of the ship, which is a very dangerous state that must be avoided. Therefore, the water jet speed needs to be gradually increased from zero with the speed of the ship. If the difference between the sailing speed and the water jet speed is kept within 50m / s, a lot of cavitation will not be generated. With the increase of the water jet speed and the speed of the ship, the speed of the ship can be increased to a very high speed.

[0026] IV. Conclusion

[0027] Seawater enters the ship through the front water inlet, is filtered by the seawater purification system, and then is pressurized by the booster pump and pressed into the high-pressure water storage tank. With the assistance of the high-pressure air storage tank, the high-pressure seawater is transported to the high-pressure seawater injection module through the high-pressure water supply pipeline. The high-pressure seawater injection module sprays high-pressure and high-speed seawater to the rear of the ship, forming a layer of high-speed backward-flowing water film below the waterline of the ship. The high-speed backward-flowing water film greatly reduces the resistance of the water flow to the ship, so the water flow resistance is very small, and only a small forward power is required to travel at high speed.

Claims

1. The present invention discloses a ship resistance reduction system, which uses ship-borne power to compress seawater to form high-pressure seawater, which is supplied to a high-pressure seawater injection module through a pipeline. The high-pressure seawater injection module injects water to the rear of the ship through a large number of flat capillary nozzles, forming a very thin layer of water film flowing backwards below the waterline of the ship. The faster the water film flows backwards, the smaller the seawater resistance the ship encounters when traveling at high speed. The problem of huge resistance when the ship is traveling at high speed is solved by the high-speed flowing water film.

2. According to the ship resistance reduction system of claim 1, the high-pressure seawater injection module has a plurality of flat capillary nozzles, and the plurality of high-pressure seawater injection modules are connected through a docking port and attached below the waterline of the ship. A large number of flat capillary nozzles spray high-pressure seawater at high speed to the rear of the ship, forming a layer of water film flowing backward at high speed, thereby reducing the seawater resistance by using the water film.

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