Low-drag water droplet type sightseeing transport catamaran

Abstract

The present application relates to the field of ship technology, and discloses a low wind resistance water drop type sightseeing transport catamaran, which comprises a designed underwater part below waterline, a middle part and a superstructure part. The designed underwater part below waterline is a wave-piercing type, a small water plane type, a round bilge type or a composite type ship body. The middle part is a ship body part between the designed waterline and the bottom of the catamaran connecting bridge. The superstructure part comprises a main part of the superstructure and two sides of the superstructure. The present application effectively reduces the resistance received by the ship during navigation, reduces the proportion of wind resistance in the total resistance of the ship body, and reduces the air resistance received by the ship body during navigation. The present application adopts a full-enclosed structure, a large number of glass windows can be arranged on the top and the side of the ship, which greatly improves the illumination of the whole ship, and is also very beneficial to the installation of solar photovoltaic panels on the outer plate of the superstructure structure in a large area, and solar energy is used as the energy source of the auxiliary power system.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, specifically to a low-drag teardrop-shaped sightseeing catamaran. Background Technology

[0002] Catamarans are widely used in coastal and inland waterway sightseeing or short-distance passenger transport industries due to their advantages such as high speed, good stability, and large deck area. However, it is precisely because of the large deck area, high speed, and full superstructure that catamarans experience air resistance that can reach more than 150% of that of monohull passenger ships of the same size.

[0003] For medium- and high-speed catamarans, since wind resistance is proportional to the square of the actual wind speed encountered by the hull, the air resistance encountered during high-speed navigation is more significant, and may even account for 10% to 20% or more of the total hull resistance. Scientifically designing the superstructure of catamarans to reasonably reduce the air resistance encountered by the hull during navigation without affecting the layout and passenger capacity has become one of the key considerations in the design of medium- and high-speed catamarans.

[0004] Document CN 116476970 A discloses a shallow-draft high-speed catamaran. The hull comprises two hulls connected by a connecting bridge. Each hull includes a wave-piercing bow, a rounded bilge midships, and a square stern, all smoothly transitioning from one another. The bottom of the wave-piercing bow is a deep V-shape, and its front end includes a pointed upper bow and a lower bow. The cross-sectional area of ​​the wave-piercing bow gradually increases from front to back. The left and right sides of the front of each hull have concave semi-waterline profiles, the depth of which gradually decreases from front to back. These semi-waterline profiles are located at the designed waterline height of the hull. Due to the shape of the hull, this structure can easily generate significant resistance when the hull is moving forward, affecting its navigation.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the aforementioned issues, this invention discloses a low-wind-resistance teardrop-shaped sightseeing catamaran, which effectively reduces the resistance encountered by the vessel during navigation, lowers the proportion of wind resistance in the total hull resistance, and reduces the air resistance encountered by the hull during navigation.

[0007] The technical solution of the present invention is as follows: a low wind resistance teardrop-shaped sightseeing catamaran, comprising an underwater part below the design waterline, a middle part, and a superstructure part. The underwater part below the design waterline is a wave-piercing, small waterplane area, round bilge, or composite hull. The middle part is the hull part between the design waterline and the bottom of the catamaran connecting bridge. The superstructure part includes the main body of the superstructure and the two sides of the superstructure.

[0008] By adopting the above technical solutions, the ship is designed as a fully enclosed structure. A large number of glass windows can be arranged on the top and sides of the ship, which greatly improves the illumination of the entire ship. It is also very conducive to installing solar photovoltaic panels on the outer plating of the superstructure on a large scale, and using solar energy as the energy source for the auxiliary power system.

[0009] Preferably, the hull is selected based on the design speed and service speed.

[0010] By adopting the above technical solutions, the adaptability is high, and different options can be selected according to different situations.

[0011] Preferably, the main body of the superstructure is the part of the superstructure within the width range of the bottom of the connecting bridge, and the two side parts of the superstructure are the parts of the superstructure with a width greater than the width of the bottom of the connecting bridge.

[0012] Preferably, the superstructure portion has an arc-shaped cross section along the length of the ship, with a fullness between 0.6 and 0.85.

[0013] Preferably, the superstructure is teardrop-shaped, a radar mast is mounted on the upper part of the superstructure, and glass windows are installed on both sides of the superstructure.

[0014] By adopting the above technical solutions, the overall illumination of the ship can be improved.

[0015] Preferably, the main body of the superstructure has all its outer longitudinal profiles in the beam direction as NACA 4-digit airfoils with the same camber but different thicknesses.

[0016] Preferably, the NACA 4-digit airfoil is a NACA 4-digit airfoil without camber, in which case its upper arc surface is an airfoil curve and its lower arc surface is a straight line; or it is a NACA 4-digit airfoil with camber, in which case its upper and lower arc surfaces are consistent with the airfoil curve.

[0017] Preferably, the 4-digit airfoil of NACA is determined according to the ship's speed and the hydrology and sea state of the navigation area. For medium-speed ships, i.e. catamarans with a Froude number in the range of 0.2 to 0.25, a 4-digit NACA airfoil without camber is suitable. For high-speed ships, i.e. catamarans with a Froude number in the range of 0.25 to 0.35, a 4-digit NACA airfoil with camber is suitable.

[0018] The advantages of this invention are as follows: 1. The superstructure of this invention is close to the shape of a teardrop, with no sharp corners and a smooth curve curvature, which effectively reduces the resistance encountered by the ship during navigation, makes it less prone to boundary layer peeling, reduces the proportion of wind resistance in the total resistance of the hull, and reduces the air resistance encountered by the hull during navigation.

[0019] 2. The superstructure of the catamaran of this invention adopts a fully enclosed structure, which can greatly improve the illumination of the whole ship by arranging a large number of glass windows on the top and sides of the ship. It is also very conducive to installing solar photovoltaic panels on the outer plate of the superstructure on a large area, and using solar energy as the energy source for the auxiliary power system.

[0020] 3. The superstructure of this invention adopts a unique teardrop-shaped design, meaning that each section of the superstructure along the width of the ship is the upper half of a NACA 4-digit airfoil. Utilizing the aerodynamic performance of the NACA 4-digit airfoil with its camber, a certain amount of lift is generated. Combined with the characteristic of high-speed ships raising their bow during navigation, an angle of attack is generated. At a certain speed, the required speed varies depending on the type of airfoil. This improves the ship's buoyancy and reduces the ship's actual navigation resistance. The superstructure is seamlessly integrated, combining speed (low wind resistance), aesthetics, and safety. Attached Figure Description

[0021] Figure 1 This is a side view of the low-drag teardrop-shaped sightseeing catamaran.

[0022] Figure 2 This is a front view of the low-drag teardrop-shaped sightseeing catamaran.

[0023] Figure 3 This is a schematic diagram of the main upper structure of the low-resistance teardrop-shaped sightseeing catamaran.

[0024] Figure 4 A side view of the vessel for the specific implementation plan;

[0025] Figure 5 A front view of the vessel for the specific implementation plan;

[0026] Figure 6 This is a top view of the vessel used for the specific implementation plan.

[0027] The components are: 1. Underwater section; 2. Mid-section; 3. Superstructure; 4. Design waterline; 5. Bottom of connecting bridge; 6. Outer contour transverse section in the length direction; 7. Main body of superstructure; 8. All outer contour longitudinal sections in the beam direction; 9. Upper arc surface; 10. Lower arc surface; 11. Bilateral sections of superstructure; 12. Radar mast; 13. Windows. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] like Figure 1-3As shown, the low-drag teardrop-shaped sightseeing catamaran includes an underwater section 1 below the design waterline, a mid-section 2, and a superstructure 3. The underwater section 1 is a wave-piercing, small waterplane area, round bilge, or composite hull. The mid-section 2 is the hull section from the design waterline to the bottom of the catamaran connecting bridge. The superstructure 3 includes the main superstructure 7 and the two side sections 11. Considering the overall motion comfort of the catamaran, the underwater section adopts a wave-piercing hull design, and the entire ship is designed as a fully enclosed structure. A large number of glass windows 13 can be arranged on the top and sides of the ship, which greatly improves the illumination of the entire ship. It is also very conducive to installing solar photovoltaic panels on the outer plates of the superstructure over a large area, using solar energy as the energy source for the auxiliary power system.

[0030] like Figure 4-6 As shown, the low-drag teardrop-shaped catamaran for sightseeing and transportation can be applied to medium- and high-speed sightseeing, transportation, passenger transport, and tour catamaran passenger ships. Through specific aerodynamic design, it can reduce the air resistance encountered by the ship during navigation. From its side view and top view, the overall outer contour line resembles a teardrop. It is mainly suitable for sightseeing and passenger use catamarans, hence the name low-drag teardrop-shaped sightseeing and transportation catamaran.

[0031] The hull is selected based on its design speed and service speed, offering high adaptability and allowing for selection based on different situations.

[0032] The hull mainly refers to the underwater part of the hull, that is, the twin-hull part. Different hull design schemes can be selected according to the design and service speed. When it is a high-speed vessel (Fr>0.3), a wave-piercing hull design is adopted. At the same time, the spacing between the hulls should also meet the characteristics of high-speed catamarans as much as possible and should not be too wide. For relatively high speeds (FR between 0.25-0.3), a small waterplane area catamaran hull design scheme is adopted, and the spacing should be widened as much as possible to avoid interference between the hulls.

[0033] The main body 7 of the superstructure is the superstructure part 3 within the width range of the bottom of the connecting bridge. The two sides 11 of the superstructure are the superstructure parts 3 with a width greater than the bottom width of the connecting bridge. The outer contour transverse section 6 of the superstructure part 3 in the length direction of the ship is all arc-shaped, and its fullness is between 0.6 and 0.85.

[0034] The superstructure section 3 is shaped like a teardrop. A radar mast is installed on the upper part of the superstructure section 3. Glass windows 13 are installed on both sides of the superstructure section 11, which can improve the illumination of the entire ship. The superstructure section is a fully enclosed design with two large glass windows, which can ensure good illumination while also providing the possibility of large-area solar photovoltaic panels.

[0035] The main body of the superstructure 7 consists of all the longitudinal sections 8 of the outer contour in the width direction of the ship, which are NACA 4-digit airfoils with the same camber but different thicknesses.

[0036] If a NACA 4-digit airfoil is used without camber, then its upper arc surface 9 is the airfoil curve and its lower arc surface 10 is a straight line. Alternatively, if a NACA 4-digit airfoil with camber is used, then its upper arc surface 9 and lower arc surface 10 are consistent with the airfoil curve.

[0037] The NACA 4-digit airfoil determines the corresponding airfoil parameters based on the ship's speed and the hydrology and sea state of the navigation area. The target navigation area is the coastal waters of the Hong Kong Special Administrative Region of the People's Republic of China. Based on the hydrological information and aerodynamic analysis results, the fullness of the cross section of the main part of the superstructure is selected as 0.725. For medium-speed ships, the Froude number corresponding to the design speed is 0.24. Therefore, the main part of the superstructure adopts the NACA0012 airfoil with a fullness of 0.725. For high-speed ships, i.e., catamarans with Froude numbers in the range of 0.25 to 0.35, the cambered NACA 4-digit airfoil is suitable.

[0038] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention; the objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A low-drag teardrop-shaped sightseeing catamaran, comprising an underwater section below the waterline, a mid-section, and a superstructure, characterized in that: The underwater portion of the hull below the design waterline is a wave-piercing, small waterplane area, round bilge, or composite hull. The intermediate portion is the hull section from the design waterline to the bottom of the catamaran connecting bridge. The superstructure includes the main body of the superstructure and the two sides of the superstructure. The main body of the superstructure has all its outer longitudinal sections in the beam direction as NACA 4-digit airfoils with the same camber but different thicknesses.

2. The low-drag teardrop-shaped sightseeing catamaran according to claim 1, characterized in that: The hull is selected based on its design speed and service speed.

3. The low-drag teardrop-shaped sightseeing catamaran according to claim 1, characterized in that: The main body of the superstructure is the part of the superstructure within the width range of the bottom of the connecting bridge, and the two sides of the superstructure are the parts of the superstructure with a width greater than the width of the bottom of the connecting bridge.

4. The low-drag teardrop-shaped sightseeing catamaran according to claim 1, characterized in that: The superstructure portion has an outer contour cross section that is arc-shaped along the length of the ship, with a fullness between 0.6 and 0.

85.

5. The low-drag teardrop-shaped sightseeing catamaran according to claim 1, characterized in that: The superstructure is roughly teardrop-shaped, with a radar mast mounted on its upper part and glass windows installed on both sides of the superstructure.

6. The low-drag teardrop-shaped sightseeing catamaran according to claim 1, characterized in that: The NACA 4-digit airfoil is a NACA 4-digit airfoil without camber, in which case its upper arc surface is an airfoil curve and its lower arc surface is a straight line; or it is a NACA 4-digit airfoil with camber, in which case its upper and lower arc surfaces are consistent with the airfoil curve.

7. The low-drag teardrop-shaped sightseeing catamaran according to claim 1, characterized in that: The NACA 4-digit airfoil parameters are determined based on the ship's speed and the hydrology and sea state of the navigation area. For medium-speed ships, i.e. catamarans with a Froude number in the range of 0.2 to 0.25, a NACA 4-digit airfoil without camber is suitable. For high-speed ships, i.e. catamarans with a Froude number in the range of 0.25 to 0.35, a NACA 4-digit airfoil with camber is suitable.

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